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FD Speedometer-Odometer Circuit Board - Components Only
Good afternoon, fellow members!
This thread is intended to be used in conjunction with this link: just got done figuring out how to fix an FD odometer Examine the photos from my Speedometer & Odometer circuit board for your reference. If anyone is interested in a specific close-up or may need a part number check from this board then please respond below. Additionally, I may need your help in identifying some part numbers from the IC chips. There are some I cannot read because of the conformal coating applied to the circuit card. Furthermore, no research was performed to cross-reference these components. Other members are more than happy to contribute their findings to this thread. NOTE: This circuit board comes from a US Spec 1994 FD. https://cimg0.ibsrv.net/gimg/www.rx7...4776301b42.jpg Speedometer Face + Circuit Board |
https://cimg6.ibsrv.net/gimg/www.rx7...3475c03853.jpg
R10 is a 200Ω resistor<br/>D4 is a diode with no legible markings. https://cimg7.ibsrv.net/gimg/www.rx7...9edc56173c.jpg Side view of speedometer with VR (blue Phillips head). VR is the speedometer adjustment potentiometer. |
https://cimg0.ibsrv.net/gimg/www.rx7...f1f75d7fe1.jpg
Bottom 1/3 of circuit board backside. Note the surface mounted components. https://cimg1.ibsrv.net/gimg/www.rx7...25a776196f.jpg Middle 1/3 of circuit board backside. https://cimg2.ibsrv.net/gimg/www.rx7...f008ed7de6.jpg Top 1/3 of circuit board backside. |
https://cimg5.ibsrv.net/gimg/www.rx7...bd166b8e5b.jpg
IC1 P/N*: (Stamped Motorola) Line1: 74HC14A Line2: 343BW *Please help properly ID this P/N. https://cimg7.ibsrv.net/gimg/www.rx7...3eb6ea2750.jpg IC3 P/N: Line 1: B39AD Line 2: 93C56EN |
https://cimg4.ibsrv.net/gimg/www.rx7...78bc5e934c.jpg
IC4 P/N*: (Stamped Texas Instruments) Line 1: 12903 Line 2: 1ABA (last A is boxed). *Please help ID correct part number for IC4. https://cimg3.ibsrv.net/gimg/www.rx7...8b3b4a120f.jpg IC5 P/N: Line 1: D75108GF(A) 915 Line 2: NEC Japan Line 3: 9235PX702 https://cimg2.ibsrv.net/gimg/www.rx7...b24d990dc1.jpg IC6 P/N: Line 1: AN8363UBK Line 2: Japan 41.2 |
https://cimg7.ibsrv.net/gimg/www.rx7...bd7b757fc1.jpg
C3 was previously replaced with this blue Panasonic capacitor. https://cimg8.ibsrv.net/gimg/www.rx7...120151e93a.jpg Different angle of C3 and surrounding components. https://cimg1.ibsrv.net/gimg/www.rx7...2c0518c0ee.jpg The HUGE Zener diode is ZD6. It's P/N is either 3NB PZ627, PZ627 3NB, or just PZ627. |
Photos not shown for IC2 and IC7. IC2 is located to the right of C3 and IC7 is underneath the Odometer Digital Display.
Part numbers for both are as follows: IC2 P/N: TA78DS 05P 3H IC7 P/N: OKI Japan M6544 2322201V Again, any help to properly identify the part numbers for IC1 and IC4 is appreciated. As seen in these photos, the two IC chips are covered in conformal coating and is difficult to read with a magnifying lens. |
https://cimg3.ibsrv.net/gimg/www.rx7...59418aa405.jpg
Mechanical Pencil points at IC2. https://cimg4.ibsrv.net/gimg/www.rx7...4798de51dc.jpg Mechanical Pencil points at IC7. IC7 is underneath the Odometer Digital Display. Old solder flux is the reason for all the brown stains on the circuit board. |
Thanks for posting this up! You're doing some good work here!
The 93c56en chip is the odometer chip, my thread on the odometer and making JDM clusters work covers that. It's an EEPROM that stores the pulses from the speed sensor. Dale |
Thanks, Dale! And thank you for identifying IC3 as the Odometer chip. Is this the link you refer to?
https://www.rx7club.com/3rd-generati...o-mph-1015964/ Do you have any other part IDs? If anyone else has more input on proper part numbers or DigiKey part numbers then feel free to respond. Cheers, George |
This looks like a probable match for ZD6, a high-power 27V zener diode by Sanken Electric Co. Datasheet link here: http://datasheet.datasheetarchive.co...051.1489734055
Are there any parts that fail often or get damaged often? I've skimmed through the other tacho and speedo threads, but fortunately haven't had any trouble with mine so I was not reading closely. |
Thanks for the research, Scotty!
The good news is that the part number is the same as stenciled on the diode, PZ627. The bad news is that part cannot be purchased, it is no longer manufactured. The likelihood of that power zener diode blowing up is relatively small. The most failed item that I've seen on the speedometer board is C3, and/or a few other capacitors. I'd also like to add something from Dale's speedometer conversion (see link in post #10). Another member found a suitable part number for VR (Variable Resistor) used to calibrate the speedometer. In short, here's the skinny: VR: 200kΩ, trimmer potentiometer, Digikey P/N: 3306K-204-ND, manufacturer P/N: 3306K-1-204 ZD6: P/N: PZ627, Power Zener diode, manufactured by Sanken, availability unknown/no longer available Cheers, George |
Speedometer Components List
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
Good evening, fellow members! While replacing a few capacitors today, I did a little more digging on the speedometer circuit board. Here is a list of components with their part numbers or values. This list is intended to be a better place to extract part numbers instead of sifting through photos. Use DigiKey, Mouser, or Google to cross-reference these parts. NOTE: Quite a few part numbers were either illegible, partially visible, or not stenciled on the part. If I made any errors on this list or if anyone can add to this list with part numbers or missing values then please post your findings. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 153J50 (line 1) NIS F (line 2), *Need capacitance & voltage values* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A IC2: TA78DS IC3: 93C56EN IC4: L2903 *not 12903 from the photos* IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 Power Transistors: TR1: D1922 (line 1), E (under last 2) TR2: D1922 (line 1), E (under last 2) TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3) TR6: A143 (line 1), X.SZ (line 2) TR7: C144 (line 1), ESZ (line 2) TR8: C144 (line 1), ESZ (line 2) TR9: C1214 (line 1), C (under last 4) Diode Arrays: DA1: P209 (line 1), S. X (line 2) DA2: DA218 Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, *Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 7 *Partial* ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
I agree PZ627 is unlikely to fail, I wouldn't bother looking for an equivalent replacement unless someone actually needed it.
The part suggested for C3 looks good to me, although if there is space for a slightly taller capacitor this one can tolerate higher voltage: digikey PN P10225-ND |
Scotty,
Thank you for sharing the alternate P/N for C3. I offer a word of caution when replacing capacitors rated at higher voltages. Think of that higher voltage rating in a capacitor like a fuse - when the fuse fails it will do so at its rating. Replacing a 10A fuse with a 15A fuse in a circuit will lead to damaged components because failure occurred at a higher value. If a replacement capacitor is rated for 10V where the original is rated for 6.3V then further damage may occur to the surrounding circuit should a failure occur. More importantly, a capacitor's charge & discharge rate could be negatively affected when a higher voltage rating is used. Keep in mind that capacitors oppose any change in voltage. That could equate to unforeseen circuit malfunctions. Cheers, George |
Updated List - Added ZD4
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
Here is an updated list that added the part number for ZD4. Thanks to TravAZ who posted his results on Post 192 & 195 at https://www.rx7club.com/3rd-generati...-599220/page8/. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 153J50 (line 1) NIS F (line 2), *Need capacitance & voltage values* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A IC2: TA78DS IC3: 93C56EN IC4: L2903 *not 12903 from the photos* IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 Power Transistors: TR1: D1922 (line 1), E (under last 2) TR2: D1922 (line 1), E (under last 2) TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3) TR6: A143 (line 1), X.SZ (line 2) TR7: C144 (line 1), ESZ (line 2) TR8: C144 (line 1), ESZ (line 2) TR9: C1214 (line 1), C (under last 4) Diode Arrays: DA1: P209 (line 1), S. X (line 2) DA2: DA218 Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, *Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
I can't find any values for DA218 or anything to cross reference it. Anyone happen to know?
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Here is a link for the datasheet on DA1: ROHM - datasheet pdf
But DA2 (DA218) is a bit harder to find. This is the closest datasheet that I found: Datasheet Archive The 2nd link actually shows data for P209 and DA218. When the link opens, click the 3rd PDF link. FD Kid, Did DA2 have a melt down? I hope these links help you. Please let me know if you find a suitable replacement for DA2. Cheers, George |
Originally Posted by Gen2n3
(Post 12164970)
Scotty,
I offer a word of caution when replacing capacitors rated at higher voltages. Think of that higher voltage rating in a capacitor like a fuse - when the fuse fails it will do so at its rating. Replacing a 10A fuse with a 15A fuse in a circuit will lead to damaged components because failure occurred at a higher value. If a replacement capacitor is rated for 10V where the original is rated for 6.3V then further damage may occur to the surrounding circuit should a failure occur. More importantly, a capacitor's charge & discharge rate could be negatively affected when a higher voltage rating is used. Keep in mind that capacitors oppose any change in voltage. That could equate to unforeseen circuit malfunctions. Cheers, George The voltage rating on a capacitor is the maximum amount of voltage that a capacitor can safely be exposed to and can store. Remember that capacitors are storage devices. The main thing you need to know about capacitors is that they store X charge at X voltage; meaning, they hold a certain size charge (1µF, 100µF, 1000µF, etc.) at a certain voltage (10V, 25V, 50V, etc.). So when choosing a capacitor you just need to know what size charge you want and at which voltage. Why does a capacitor come in different voltage ratings? Because you may need different voltages for a circuit depending on what circuit you're dealing with. Remember, capacitors supply voltage to a circuit just like a battery does. The only difference is a capacitor discharges its voltage much quicker than a battery, but it's the same concept in how they both supply voltage to a circuit. A circuit designer wouldn't just use any voltage for a circuit but a specific voltage which is needed for the circuit. For one circuit, 12 volts may be needed. A capacitor with a 12V rating or higher would be used in this case. In another, 50 volts may be needed. A capacitor with a 50V rating or higher would be used. This is why capacitors come in different voltage ratings, so that they can supply circuits with different voltages, fitting the power (voltage) needs of the circuit. Take note that a capacitor's voltage rating is not the voltage that the capacitor will charge up to, but only the maximum amount of voltage that a capacitor should be exposed to and can store safely. For the capacitor to charge up to the desired voltage, the circuit designer must design the circuit specifically for the capacitor to charge up to that voltage. A capacitor may have a 50-volt rating but it will not charge up to 50 volts unless it is fed 50 volts from a DC power source. The voltage rating is only the maximum voltage that a capacitor should be exposed to, not the voltage that the capacitor will charge up to. A capacitor will only charge to a specific voltage level if fed that level of voltage from a DC power source. Keep in mind that a good rule for choosing the voltage ratings for capacitors is not to choose the exact voltage rating that the power supply will supply it. It is normally recommended to give a good amount of room when choosing the voltage rating of a capacitor. Meaning, if you want a capacitor to hold 25 volts, don't choose exactly a 25 volt-rated capacitor. Leave some room for a safety margin just in case the power supply voltage ever increased due to any reasons. If you measured the voltage of a 9V battery supply, you would notice that it reads above 9 volts when it's new and has full life. If you used an exact 9-volt rated capacitor, it would be exposed to a higher voltage than the maximum specified voltage (the voltage rating). Usually, in a case such as this, it shouldn't be a problem, but nevertheless, it's a good safety margin and engineering practice to do this. You can't really go wrong choosing a higher voltage-rated capacitor than the voltage that the power supply will supply it, but you can definitely go wrong choosing a lower voltage-rated capacitor than the voltage that it will be exposed to. If you charge up a capacitor with a lower voltage rating than the voltage that the power supply will supply it, you risk the chance of the capacitor exploding and becoming defective and unusable. So don't expose a capacitor to a higher voltage than its voltage rating. The voltage rating is the maximum voltage that a capacitor is meant to be exposed to and can store. Some say a good engineering practice is to choose a capacitor that has double the voltage rating than the power supply voltage you will use to charge it. So if a capacitor is going to be exposed to 25 volts, to be on the safe side, it's best to use a 50 volt-rated capacitor. Also, note that the voltage rating of a capacitor is also referred to at times as the working voltage or maximum working voltage (of the capacitor). So when seeing the (maximum) working voltage specification on a datasheet, this value refers to the maximum continuous voltage that a capacitor can withstand without becoming damaged. |
I agree with Chuck (cewrx7r1). I don't work with aerospace-grade equipment, but I have used 16V capacitors on 5V supply lines and 25V capacitors on 12V supply lines without problems. In an automotive application, it's not uncommon for the 12V supply voltage to spike above 40V for a very short time after the ignition key is turned off; research 'load dump' or 'inductive flyback' if you want to learn more about it. A 16V capacitor will live a short life under those conditions, 25V will probably survive, and 50V capacitor should be good but the package size will be quite a bit larger. The 5V line is less likely to see excess voltage, unless there is a short in the harness or a person accidentally connects 12V to the 5V line by wiring a sensor incorrectly. This would be the reason to use a 16V capacitor on a 5V supply line that might connect to the outside world, if packaging space and budget allows. For the inside of an RX-7 odometer it might be overkill... if 12V gets on the 5V line there are probably other components beside the capacitors to worry about.
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Chuck & Scotty,
You make excellent points and took a lot of time researching the function of a capacitor in an electrical circuit. I was attempting to reinforce the practice of replacing a bad component with a new one that matches the same values. Fortunately, these capacitors are easily sourced and there is no need to increase the safe working voltage of a capacitor because of convenience. Additionally, no schematics exist for the speedometer circuit board so it would be difficult to logically evaluate the benefits of altering some component values. As Chuck stated, the voltage rating on a capacitor is the maximum amount of voltage that a capacitor should be exposed to and can store safely. However, don't assume that a higher voltage capacitor has the required performance; a capacitor of a specific value has a specific job. It's replacement should meet that specific job. Could there be unforeseen changes in the circuit, especially with RC charge/discharge times? I do have one other opinion to offer: There may be other members who are not comfortable soldering components or may lack electrical troubleshooting skills. Please be careful when repairing the speedometer circuit board and/or the instrument cluster. There are tachometer quick fixes on the forum that may inadvertently cause more problems, such as the speedometer board blowing up. If there is a need to run new wires outside of the flex print to the tach then perhaps a different solution may be considered. Soldering is not too complex but it is tedious and requires a steady hand. If a member has low confidence then seek help from someone whose been there before. There are many members who would be happy to help, myself included. In the end we contribute to the preservation of our cars through threads like this and other how-to's. Again, Chuck & Scotty thank you for providing those detailed points about capacitors! Cheers, George P.S. Members, your help is still needed to identify the remaining unidentified components. |
moved to correct thread.
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fzkhan7, thank you for posting photos of your board. It should really go here: just got done figuring out how to fix an FD odometer for advise.
This thread is only intended for parts identification. Consider it an illustrated parts breakdown that lists component values and/or part numbers. In the mean time, look at Post #243 for suggestions. Cheers, George |
Updated List - Added TR5, TR7, & TR8
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
After reading some old posts, this update adds P/Ns for TR7 and TR8. Thanks to OP - Post #130 and OP Post #109! Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 153J50 (line 1) NIS F (line 2), *Need capacitance & voltage values* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A IC2: TA78DS IC3: 93C56EN IC4: L2903 *not 12903 from the photos* IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 Power Transistors: TR1: D1922 (line 1), E (under last 2) TR2: D1922 (line 1), E (under last 2) TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3), Google " transistor 2SC458"* TR6: A143 (line 1), X.SZ (line 2) TR7: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR8: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR9: C1214 (line 1), C (under last 4) * - Search on Google resulted in transistor for purchase on other sites (not DigiKey or Mouser Electronics). Diode Arrays: DA1: P209 (line 1), S. X (line 2) DA2: DA218 Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, *Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
C15 Decoded - Maybe!
I decoded C15 using a capacitor calculator and other Google-fu sources. I am leery about the voltage rating so if anyone replaces this capacitor, try at your own risk then report back to this thread. C15 is stamped "153J50" which breaks down into:
153 - 0.015uF or 15nF J - 5% (+/-) tollerance 50* - 50V * - This is an estimate!!! Try at your own risk!!! There are several standards for labeling capacitors! Cross-referenced to DigiKey and Mouser part numbers would result in this: 0.015uF, 50V, -40 to 85*C (DigiKey) or -55 to 100*C (Mouser), film type capacitor DigiKey P/N: 493-3457-ND, Manufacturer P/N: QYX1H153JTP Mouser P/N: 80-MMK5153J50J01TA18, Manufacturer P/N: MMK5153J50J01L16.5TA18 I would suggest trying the Mouser P/N because the "153J50" easily crossed to a P/N, listed the voltage rating at 50V, and it's temperature range falls more in-line with the other caps, typically -40 to 105*C. Cheers, George |
Updated List - Added C15
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
This list reflects the decoded value of C15. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 0.015uF, 50V, Mouser P/N: 80-MMK5153J50J01TA18 *CAUTION: Refer to Post #25!* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A IC2: TA78DS IC3: 93C56EN IC4: L2903 *not 12903 from the photos* IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 Power Transistors: TR1: D1922 (line 1), E (under last 2) TR2: D1922 (line 1), E (under last 2) TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3), Google " transistor 2SC458"* TR6: A143 (line 1), X.SZ (line 2) TR7: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR8: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR9: C1214 (line 1), C (under last 4) * - Search on Google resulted in transistor for purchase on other sites (not DigiKey or Mouser Electronics). Diode Arrays: DA1: P209 (line 1), S. X (line 2) DA2: DA218 Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, *Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
Originally Posted by Gen2n3
(Post 12167173)
Here is a link for the datasheet on DA1: ROHM - datasheet pdf
But DA2 (DA218) is a bit harder to find. This is the closest datasheet that I found: Datasheet Archive The 2nd link actually shows data for P209 and DA218. When the link opens, click the 3rd PDF link. FD Kid, Did DA2 have a melt down? I hope these links help you. Please let me know if you find a suitable replacement for DA2. Cheers, George I Replaced the big capacitor (it was blown) and the smaller ones (10uf, 50v) just in case. My odometer still didnt work. So I looked all over, used the multimeter to check connections, all the chips have good connection to the board. The only thing i saw was that transistor being TR7 and Diode DA2 gave no readings, when check with the meter. Also the connections looked a bit corroded. When I used my Desolder gun to remove the solder to DA2 and DA1, and pulled them out, the leads pretty much crumbled off. Everything on my gauge cluster worked but the Odometer. This is becoming a huge annoyance. |
So it looks like these might work:
TR6 (A143): 10 PCS DTA143XSA TO-92S DTA143 A143 Digital transistors (built-in resistors) | eBay DA2 (DA218): 5pcs 10pcs DA218S DA218-S Transistor TO-92 100% ROHM New And Genuine | eBay DA1 (P209): still looking Any Rejections so far to these replacements? |
Epyon,
It looks like TR6 and DA2 links from ebay look like the proper replacement parts. Naturally, it would be better to find an electronics supply store (Mouser, DigiKey, etc) that carries these components under a specific part number. This way other Members could easily order the specific quantity and/or easily get replacement components that superseded the original part numbers. Any luck with DA1's replacement? Cheers, George |
1 Attachment(s)
Hmmm, I don't understand how or why but my original post vanished into thin air! So 2nd attempt:
I have some good news and some bad news about the diode array, DA1. First the good news because it is very short. The part number for DA1, P209 was made by a company called Rohm Semiconductors. The part number is DAP209 or DAP209S. Either part number will work because their specifications are identical. The only difference between them is the packaging type. The DAP209 package is a TO-92 can, similar to IC2 (see reference pic of this thread). A TO-92 can looks like a cylinder with a flat spot on one side. The DAP209S package is a SPT package. Basically, it looks like a trapezoidal encasement. The SPT package type was used on the speedometer board. Again, either packaging could be used without any loss in performance. And now the bad news.... I reached out to Rohm Semiconductors via email and received a reply today. Here is their reply: Hello George, The DAP209 and DAP209S are very old parts, and we unfortunately no longer make parts in these packages anymore. We only have surface mounted packages available for these parts: Switching Diode - DAP202K | ROHM Semiconductor - ROHM Co., Ltd. Switching Diode - DAP202UM | ROHM Semiconductor - ROHM Co., Ltd. **End of Reply** The links are for surface mounted devices (SMDs). Therefore the limited ways to get a replacement diode array are to replace the next higher assembly - either the speedometer circuit board or the (whole) speedometer assembly, or salvage solid state components from bad circuit boards. For those interested, take a look at the file attachment for the DAP209 datasheet. I also want to point out the difference between the DANxxx and DAPxxx series of diode arrays. The "N" represents a common cathode diode array, or simply a common negative (-) lead. The "P" represents a common anode diode array, or simply a common positive (+) lead. Our circuit board requires the DAPxxx series diode array in order to function normally. Otherwise, the DANxxx series diode array would always keep the circuit switched off. I also searched DigiKey for any other potential replacements using the specifications from the datasheet. My search returned only 2 devices and they were both SMDs! Does anyone else have other suggestions to replace DA1 with an appropriate replacement? Cheers, George |
Originally Posted by EpyonFD
(Post 12213067)
So it looks like these might work:
TR6 (A143): 10 PCS DTA143XSA TO-92S DTA143 A143 Digital transistors (built-in resistors) | eBay DA2 (DA218): 5pcs 10pcs DA218S DA218-S Transistor TO-92 100% ROHM New And Genuine | eBay DA1 (P209): still looking Any Rejections so far to these replacements? Cheers, George |
Hey George,
Thanks for sharing that information. I would provide part numbers but I dont know them. Those two ebay links were as close I could get/find for a replacement. I posted up on some electronics forums in hopes of some electronic guru to chime in but so far they dont know either. Currently Waiting on the parts to come in and I will update with results. Good news for me is that DA1 (P209) is still in ok condition according to my multimeter, so I will use it again. I also bought a used gauge cluster in Km, for back up if the above doesnt work out. Kind of taking a gamble with the used cluster but I think it should be ok. I also contacted Knight Sports since they still sell these odometer/speedo combo new, though highly doubt ill get a reply from them with part numbers, hehe. I did speak with a rep at DigiKey and they werent able to help me out. Edit: Just checked on one of those electronics forum and this is what someone from China said https://www.eevblog.com/forum/repair/odometer-repair/ "DA218S is series connected dual diode with 0.1A, 80V rating. Pin definition: A1-K1A1-K2. A143 is likely to be a pre-biased PNP, can be replaced with NXP PDTA143." |
Epyon,
I believe those links to the ebay components are a good start but only for short term. An electronics store/website like Mouser or DigiKey would be preferred as they could resupply stock from a host of manufacturers. It's good to hear that you have a working DA1! For the most part, TR6 and DA2 or other solid state components normally do not fail. I speculate the reason for these or other components to fail results from a large power surge; and could potentially come from modifications to the cluster. Let me stress again, that a modification to the cluster MAY POTENTIALLY cause other components to fail. The more we dig around the instrument cluster would result in inadvertent damage. So please, caution is advised when removing the instrument cluster and its gauges. ***Break*** And now for something completely different! Well, not really...but there is some good news to report! As previously stated, the DAP209 diode array was superseded by SMD (Surface Mounted Devices) under part numbers: DAP202K or DAP202UM. Refer to Post #30. The difference between these new SMD components is the package size. One is a SC-59 package while the other is a SC-85 package. I received a couple of more emails from the Rohm Semiconductors Engineering Dept regarding a workaround for DA1. Rohm Engineering Reply: Hello George, I was able to find a breakout board on digi-key for converting from SC-59 to through-hole. The board is for 5 pin parts, but will still work with 3 pin. DigiKey - Capital Advanced Technologies 33205 Adapter Board ----------------------------------------------------------------------------------- My reply: Many thanks for all your help! You are especially helpful in locating an adapter board. However, the adapter looks too long to fit onto the existing board, which is part of a car's speedometer assembly. Please see the attached photos, the red circle indicates the original location of the DAP209 part. I believe the adapter board would not have the space between other components and the speedometer face. Am I overlooking anything or could there be another solution? Could something work for the DAP202UM (SC-85 type package) instead of the DAP202K (SC-59 type package)? Could these options be used? DigiKey - Capital Advanced Technologies 6103 Adapter Board DigiKey - Capital Advanced Technologies 33003 Adapter Board Again, my sincerest thanks for all your help! Cheers, George NOTE: I also sent them 3 photos (not attached here) that showed the location of DA1. -------------------------------------------------------------------------------------- Rohm Engineering Reply: Hi George, I would think that the 33003 part(for SOT-323) should work along with the DAP202UM. I checked the datasheet for both parts, and the pinout will be the same. The orientation that you place the part in shouldn't play a difference either. This should work for your need. Part can be ordered here: DigiKey - Rohm Semiconductor DAP202UMTL ------------------------------------------------------------------------------------- In conclusion, the DAP202 series of SMD superseded the DAP209 series of components. Should anyone's DA1 fail then an option exists to use the DAP202 series of SMD component along with the Capital Advanced Technologies 33003 adapter board. I would presume that some modification to the adapter's legs would be required to fit into the through holes. I believe this would be the best solution if a Member wants to use brand new components instead of cannibalizing discrete components from bad circuit boards. The big question to ask is: Who is willing to try this replacement? Cheers, George |
Updates to IC4 and DA1 Part Numbers
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
This list reflects updates to IC4 and DA1. I await feedback on TR6 and DA2 replacement part numbers. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 0.015uF, 50V, Mouser P/N: 80-MMK5153J50J01TA18 *CAUTION: Refer to Post #25!* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, Manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A IC2: TA78DS IC3: 93C56EN IC4: LM2903, DigiKey P/N: 497-1559-2-ND, Manufacturer P/N: LM2903DT IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 Power Transistors: TR1: D1922 (line 1), E (under last 2) TR2: D1922 (line 1), E (under last 2) TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3), Google "transistor 2SC458"* TR6: A143 (line 1), X.SZ (line 2) TR7: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR8: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR9: C1214 (line 1), C (under last 4) * - Search on Google resulted in transistor for purchase on other sites (not DigiKey or Mouser Electronics). Diode Arrays: DA1: DAP209S (old)* or DAP202K, DigiKey P/N: DAP202KT146CT-ND, or DAP202UM, DigiKey P/N: DAP202UMTLCT-ND DA2: DA218 * - Refer to Post #33 when using either DAP202K or DAP202UM SMD components as a replacement for DAP209. Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, (Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
Updates to IC1, IC2, TR1, TR2, and TR6
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
This list reflects updates to IC1, IC2, TR1, TR2, and TR6 part numbers. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 0.015uF, 50V, Mouser P/N: 80-MMK5153J50J01TA18 *CAUTION: Refer to Post #25!* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, Manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A (Original): 74HC14A, DigiKey P/N: MC74HC14ADR2GOSCT-ND, Manufacturer P/N: MC74HC14ADR2G or DigiKey P/N: MC74HC14ADGOS-ND, Manufacturer P/N: MC74HC14ADG IC1 (TI alternate): Digikey P/N: 296-12887-1-ND, Manufacturer P/N: SN74HC14NSR IC2*: TA78DS (Original), aka TA78DS05P superseded by SMD: TA78DS05AF: DigiKey P/N: TA78DS05AF(TE12L,F-ND, Manufacturer P/N: TA78DS05AF(TE12L,F IC3: 93C56EN IC4: LM2903, DigiKey P/N: 497-1559-2-ND, Manufacturer P/N: LM2903DT IC5: D75108GF(A) IC6: AN8363UBK IC7: M6544 * - Must use SOT-89 to Through Hole Adapter with SMD type of IC2: DigiKey P/N: 6303CA-ND, Manufacturer P/N: 6303, Link – SOT-89 Adapter Power Transistors: TR1/TR2: 2SD1922, *Order P/N 2SD1922 from La Mesa TV Supply Company, La Mesa TV Supply - 2SD1922 * TR1/TR2 (Alternate): DigiKey P/N: BC33825TACT-ND, Manufacturer P/N: BC33825TA TR3: G8 (device is very small, next to ZD6) TR4: B1217 TR5: C458 (line 1), D (line 2), 3D1 (line 3), Google "transistor 2SC458"* TR6: A143 (Original), SMD Replacement: Mouser P/N: 771-PDTA143TU115, Manufacturer P/N: PDTA143TU,115, Package Type SOT323** TR7: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR8: C144 (line 1), ESZ (line 2), Google this P/N NTE123AP* TR9: C1214 (line 1), C (under last 4) * - Search on Google resulted in transistor for purchase on other sites (not DigiKey or Mouser Electronics). ** - Must use SMD to Through hole adapter, located here: DigiKey Link - SC-59 Adapter. Refer to Post #33 above. Diode Arrays: DA1: DAP209S (old)* or DAP202K, DigiKey P/N: DAP202KT146CT-ND, or DAP202UM, DigiKey P/N: DAP202UMTLCT-ND DA2: DA218 * - Refer to Post #33 when using either DAP202K or DAP202UM SMD components as a replacement for DAP209. Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, (Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
Well an update from me. I got the parts in and replaced them. Still had no luck. I doubled check all my connections on both sides of the board and they look solid. I had purchased a used cluster RHD on ebay, but it hasnt arrived, the seller thinks maybe it got lost during shipping. So ill have to get my refund back and buy from someone else.
Really irritated with this thing. Ive read just about all the threads related to this issue and still no luck. Suppose ill keep at it and will report back if I get it to work again. |
Epyon,
Do you have any photos to share of the board and replacement components? Which components did you replace: just TR6 and DA2? Cheers, George |
https://cimg9.ibsrv.net/gimg/www.rx7...8f39c54f84.jpg
https://cimg0.ibsrv.net/gimg/www.rx7...7eba882eaa.jpg https://cimg1.ibsrv.net/gimg/www.rx7...1f9ce493dd.jpg https://cimg2.ibsrv.net/gimg/www.rx7...a14b332518.jpg https://cimg3.ibsrv.net/gimg/www.rx7...26028e50a1.jpg https://cimg6.ibsrv.net/gimg/www.rx7...462c58bd61.jpg https://cimg7.ibsrv.net/gimg/www.rx7...1b644d06f0.jpg The fibers you see on that one brown capacitor is just hair. Some areas are a bit glob on but wanted to make sure the connection on the top side was good, since those areas solder wouldnt seep through when soldering from the back side. So I replaced all the brown capacitors, the big blue capacitor and DA2 and TR6. I re did the solder joint at t he very end on that one small chip by the brown capacitor, why it looks like that. Anything you see that has red flags all over it and I just dont understand due to my inexperience with this stuff? |
Well damn, looks like I may have a broken path. Can anyone post a picture of what it should look like, with a flashlight under neath?
Guess Ill redo those two connections on that chip at the end too. https://cimg1.ibsrv.net/gimg/www.rx7...516e940c8c.jpg Edit: Found another broken Path. The picture with the chip I think may be good still. https://cimg4.ibsrv.net/gimg/www.rx7...b403884bf8.jpg https://cimg5.ibsrv.net/gimg/www.rx7...7a9536a9a3.jpg I think Im pretty much screwed? Not sure how to reconnect the pathways. |
Cross-References, Adapter, and Links
This post provides updated information to support a proposed replacement transistor for TR7 and TR8. Additionally, this will also have links to SMD adapters or components sourced outside of Mouser or DigiKey. This will reduce the need to reapply web links in a parts list that receives frequent updates.
Proposed replacement information on the following components can be found here: TR5 & TR9: Troubleshoot FD Speedo Board Post #36 TR7 & TR8: Troubleshoot FD Speedo Board Post #37 SOT-89 Adapter: DigiKey Link - SOT-89 Adapter (For use with IC2) SC-59 Adapter: DigiKey Link - SC-59 Adapter (For use with TR6 and DA1) Order site for IC1/IC2 Part Number 2SD1922: La Mesa TV Supply |
Updates to IC3, TR5, TR7, TR8, & TR9
***UPDATE: This information is out of date but remains for historical tracking purposes. Please refer to the most recent post that reflects the most up-to-date and accurate part number lists.***
This list reflects updated information for IC3, TR5, TR7, TR8, and TR9. Capacitors (Values shown)(Temp on all Caps: 105*C) C1: 10uF, 50V, DigiKey P/N: 493-1890-ND C2: 47uF, 25V, DigiKey P/N: P5539-ND C3: 1000uF, 6.3V, DigiKey P/N: P10199-ND C4: 1uF, 50V, DigiKey P/N: 565-1332-ND C5: *Surface mount device on backside of board* C6: 1uF, 50V, DigiKey P/N: 565-1332-ND C7: *Surface mount device on backside of board* C8: *Surface mount device on backside of board* C9: R33 (line 1) BP (line 2), 50V, *P/N search suggests 33uF* C10: *Surface mount device on backside of board* C11: 2.2uF, 50V, DigiKey P/N: P13462-ND C12: 10uF, 50V, DigiKey P/N: 493-1890-ND C13: 1uF, 50V, DigiKey P/N: 565-1332-ND C14: *Surface mount device on backside of board* C15: 0.015uF, 50V, Mouser P/N: 80-MMK5153J50J01TA18 *CAUTION: Refer to Post #25!* C16: 2.2, 50V, *Need capacitance value, could be uF or pF* C17: 1, 50V, *Need capacitance value, could be uF or pF* Resistors: R10: 20Ω, 5% Tolerance (stamped 20ΩJ) R18: 20kΩ, 5% Tolerance R25: 10kΩ, 5% Tolerance VR: 200kΩ, Digikey P/N: 3306K-204-ND, Manufacturer P/N: 3306K-1-204 Integrated Circuits: IC1: 744C14A (Original): 74HC14A, DigiKey P/N: MC74HC14ADR2GOSCT-ND, Manufacturer P/N: MC74HC14ADR2G or DigiKey P/N: MC74HC14ADGOS-ND, Manufacturer P/N: MC74HC14ADG IC1 (TI alternate): Digikey P/N: 296-12887-1-ND, Manufacturer P/N: SN74HC14NSR IC2: TA78DS (Original), aka TA78DS05P superseded by SMD: TA78DS05AF: DigiKey P/N: TA78DS05AF(TE12L,F-ND, Manufacturer P/N: TA78DS05AF(TE12L,F (1) IC3: 93C56EN (Original), Mouser P/N: 698-CAT93C56LI-G, Manufacturer P/N: CAT93C56LI-G93C56EN IC4: LM2903, DigiKey P/N: 497-1559-2-ND, Manufacturer P/N: LM2903DT IC5: D75108GF(A) IC6: AN8363UBK (Obsolete Part Number, no known replacement) IC7: M6544 (1) - Must use SOT-89 to Through Hole Adapter with SMD type of IC2. DigiKey P/N: 6303CA-ND, Manufacturer P/N: 6303. Refer to above Post #41 for link to adapter. Power Transistors: TR1/TR2: 2SD1922 (2) TR1/TR2 (Alternate): DigiKey P/N: BC33825TACT-ND, Manufacturer P/N: BC33825TA TR3: G8 (device is very small, next to ZD6) TR4: B1217 (Obsolete Part Number, no known replacement) TR5: C458 (Original) Cross-referenced to 2SC458, Use Alternate - Mouser P/N: BC549BTF, Manufacturer P/N: BC549BTF TR6: A143 (Original), SMD Replacement: Mouser P/N: 771-PDTA143TU115, Manufacturer P/N: PDTA143TU,115, Package Type SOT323 (3) TR7/TR8: C144 (Original), Cross-referenced to P/N: NTE123AP TR7/TR8 (Proposed): Mouser P/N: 610-2N4401, Manufacturer P/N: 2N4401, See above Post #41. TR9: C1214 (Original) Cross-referenced to P/N: 2SC1214. Use Alternates - Mouser P/N: 610-2N3416, Manufacturer P/N: 2N3416 or Mouser P/N: 610-2N3417, Manufacturer P/N: 2N3417 (2) Order P/N 2SD1922 from La Mesa TV Supply Company. Refer to above Post #41 (3) Must use SC-59 to Through hole adapter with SMD type of TR6. Refer to above Post #33/Post #41. Diode Arrays: DA1: DAP209S (old) or DAP202K, DigiKey P/N: DAP202KT146CT-ND, or DAP202UM, DigiKey P/N: DAP202UMTLCT-ND (2) DA2: DA218 (2) Must use SC-59 to Through hole adapter with SMD type of DA1. Refer to Post #33/Post #41 when using either DAP202K or DAP202UM SMD components as a replacement for DAP209. Resistor Arrays: RA1: *Not Installed* RA2: E10kΩ39, (Implies 10kΩ resistance) Crystal: XTAL: 4190A (line 1), 3N2 (line 2) Diodes: D1: *No markings* D2: *No markings* D3: *No markings* D4: *No markings* D5: *No markings* Zener Diodes: ZD1: *Illegible* ZD2: *Illegible* ZD3: *Illegible* ZD4: 1N4742A, DigiKey P/N: 1N4742AFSCT-ND, Radio Shack P/N: 2760563 ZD5: 5 *Partial* ZD6: PZ627 ZD7: *Illegible* ZD8: 3 *Partial* ZD9: 3 *Partial* ZD10: 30 *Partial* |
Epyon,
First let me say, "Thank you" for posting your photos. They will help out alot! Second, we should take your problem over to the Troubleshooting FD Speedo Board thread here: Troubleshoot FD Speedo Board. My goal is to keep this thread reserved for listing & identifying components of the Speedo Board. There are many things to discuss and I believe that someone already has a speedo board at hand for quick reference. We shall call upon ALIENR2 for help. Cheers, George |
No Problem, Ill repost my stuff over there.
|
While helping another forum member on component replacements for the speedo board, I noted a discrepancy with the alternate Part Numbers for TR5. Remember, TR5 is a transistor with 3 legs - an Emitter (E), Base (B), and Collector (C). The problem lay in the physical orientation of these legs. This even slipped by my discerning eye! This is what I found and will provide a solution below:
1. The original part number for TR5 is 2SC458. This is not disputed. 2. The transistor leg orientation of 2SC458 is E-C-B (from left to right: Emitter, Collector, then Base). 3. The alternate part number for TR5 is BC549BTF. 4. The electrical characteristics for BC549BTF are similar to the original, 2SC458 transistor. 5. However, the transistor leg orientation of BC549BTF is C-B-E (from left to right: Collector, Base, Emitter). 6. PROBLEM: Physically, the Collector leg between these two transistors are in different positions. 7. If one were to blindly replace TR5 with the alternate P/N then the transistor will be mis-configured and cause the circuit to function abnormally or not at all. 8. If using the BC549BTF transistor then one MUST reposition the legs from C-B-E to meet the original spec of E-C-B. 9. If one were to reconfigure BC549BTF then a chance to damage the legs or short them to one another is significantly higher. 10. POTENTIAL SOLUTION: Use transistor KSC1845 as a replacement. 11. Audiophiles use transistor KSC1845 as a replacement for transistor 2SC458 frequently. 12. Transistor KSC1845 has significantly higher rated specifications. 13. However, these higher specifications are listed as MAX values. Here are some screen shots that I made to provide a comparison between the mentioned 3 transistors: https://cimg1.ibsrv.net/gimg/www.rx7...33bfc32305.jpg 2SC458 - Note the orientation of the legs. E-C-B https://cimg2.ibsrv.net/gimg/www.rx7...4986bf8685.jpg BC549 - Note the orientation of the legs. C-B-E Its electrical characteristics closely match the original 2SC458. https://cimg3.ibsrv.net/gimg/www.rx7...ffbb70ad6e.jpg KSC1845 - Note the orientation of the legs. E-C-B Its electrical characteristics far exceed the original, 2SC458 but are listed as MAX values. This example uses a reconfigured transistor, NTE123AP. https://cimg4.ibsrv.net/gimg/www.rx7...df8ad48206.jpg TR5 with a different transistor, P/N: NTE123AP. Note the 2nd and 3rd legs are re-configured from E-B-C to E-C-B. Additionally, the marking on the circuit board for TR5 indicates one physical orientation of the transistor. That is, the flat (front or billboard) side faces the viewer. Therefore, if one installed the BC549 transistor into this circuit then it would have to be turned around and have legs reconfigured like in the above photo. For those who may ask, the transistor NTE123AP did not properly work in this circuit. I propose that KSC1845 is a suitable replacement for TR5 however, a test will be necessary. Thank you for considering this new information. Cheers, George |
Has anyone had luck finding a replacement for IC2? digikey is listing it as out of stock and I have a 92 cluster I'm attempting to repair with a failed unit.
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Here's the closest I have found for IC2: https://www.digikey.com/product-deta...NOPB-ND/148139
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Spyder,
No one has yet to report a working version of IC2. Have you read Post #42 for more info about alternatives for IC2? What is the condition of IC2 on your suspected board? Based upon the datasheet and specs from Digikey, the LM2931AZ-5.0/NOPB-ND looks to be a suitable TO-92 replacement can. Thank you for the additional research! Cheers, George |
Sadly it looks like the part numbers in post 42 are out of stock. I have ordered LM2931AZ and will report back. The unit was damaged/corroded, symptoms were no tach/speedo/odo.
I am also working on ZD 5 and 7 which were damaged. Both show partial part numbers 51A. |
Are you sure that ZD5 and ZD7 need replacement? Maybe the solder joints need to be redone? Could you post any pictures of your board to this thread: Troubleshooting the FD Speedo? I would like to keep this thread relevant to indexing specific components and providing valid part numbers.
Cheers, George |
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