RX7Club.com - Mazda RX7 Forum
The yellow box is the Speedometer connector, CON1. Please verify the flex print is properly seated and secured by the push-down clip. The green box is the 3-Series connector where you need to measure the VSS voltage.
The yellow box is the Speedometer connector, CON1. Please verify the flex print is properly seated and secured by the push-down clip. The green box is the 3-Series connector where you need to measure the VSS voltage.
0 2019/08/27 19:47:57
The red box shows what looks like burn marks around the solder joint. This is 1 of 4 solder joints to the speedometer face. It must be de-soldered then soldered in place when necessary.
The red box shows what looks like burn marks around the solder joint. This is 1 of 4 solder joints to the speedometer face. It must be de-soldered then soldered in place when necessary.
0 2019/08/27 19:47:58
This is a different angle that shows capacitors C2 (left) and C4 (right). Take closer photos and verify their tops are flat or bulged out.
This is a different angle that shows capacitors C2 (left) and C4 (right). Take closer photos and verify their tops are flat or bulged out.
0 2019/08/27 19:48:02
Take a closer look at these 2 capacitors, C16 and C17. Their tops looks bulged out, especially C17. Again, this is a sign of replacement.
Take a closer look at these 2 capacitors, C16 and C17. Their tops looks bulged out, especially C17. Again, this is a sign of replacement.
0 2019/08/27 19:48:01
Take a closer look at these 2 capacitors, C4 and C6. Their tops look bulged out, which is a sign of replacement. Take a closer photo then post. Take another look at IC3. It looks crooked. Make sure that each leg does not touch one another. This chip stores the odometer reading.
Take a closer look at these 2 capacitors, C4 and C6. Their tops look bulged out, which is a sign of replacement. Take a closer photo then post. Take another look at IC3. It looks crooked. Make sure that each leg does not touch one another. This chip stores the odometer reading.
0 2019/08/27 19:48:00
R10 is a 200Ω resistor D4 is a diode with no legible markings.
R10 is a 200Ω resistor D4 is a diode with no legible markings.
0 2017/03/16 13:15:48
USDM Speedometer Stepper Motor Part Number.
USDM Speedometer Stepper Motor Part Number.
0 2019/09/07 13:23:52
Side view of speedometer with VR (blue Phillips head). VR is the speedometer adjustment potentiometer.
Side view of speedometer with VR (blue Phillips head). VR is the speedometer adjustment potentiometer.
0 2017/03/16 13:15:50
USDM 180MPH Speedometer.
USDM 180MPH Speedometer.
0 2019/09/07 13:23:54
Bottom 1/3 of circuit board backside. Note the surface mounted components.
Bottom 1/3 of circuit board backside. Note the surface mounted components.
0 2017/03/16 13:17:48
Middle 1/3 of circuit board backside.
Middle 1/3 of circuit board backside.
0 2017/03/16 13:17:50
Observing flight operations onboard USS GEORGE H.W. BUSH (CVN-70)
Observing flight operations onboard USS GEORGE H.W. BUSH (CVN-70)
0 2019/11/07 18:51:56
Top 1/3 of circuit board backside.
Top 1/3 of circuit board backside.
0 2017/03/16 13:17:52
Examine the legs of the transistors inside these 2 blue boxes.
Examine the legs of the transistors inside these 2 blue boxes.
0 2020/02/13 11:29:19
IC1 P/N*: (Stamped Motorola) 74HC14A 343BW
IC1 P/N*: (Stamped Motorola) 74HC14A 343BW
0 2017/03/16 13:20:31
These red boxes are very BAD! Bad as in they look fried. I suspect the board may be physically charred in certain spots.
These red boxes are very BAD! Bad as in they look fried. I suspect the board may be physically charred in certain spots.
0 2020/02/16 17:22:57
The capacitor, C16 inside the red box (left) does not look good. Note the brown ring at its base and the swelled top.
The capacitor, C16 inside the red box (left) does not look good. Note the brown ring at its base and the swelled top.
0 2020/02/16 17:23:17
These 3 capacitors are the ones that fail the most. They are C3, C4, and C6. They appear to have swelled tops.
These 3 capacitors are the ones that fail the most. They are C3, C4, and C6. They appear to have swelled tops.
0 2020/02/16 17:23:20
IC3 P/N: B39AD 93C56EN
IC3 P/N: B39AD 93C56EN
0 2017/03/16 13:20:32
IC6 P/N: Line 1: AN8363UBK Line 2: Japan 41.2
IC6 P/N: Line 1: AN8363UBK Line 2: Japan 41.2
0 2017/03/16 13:25:52
IC5 P/N: Line 1: D75108GF(A) 915 Line 2: NEC Japan Line 3: 9235PX702
IC5 P/N: Line 1: D75108GF(A) 915 Line 2: NEC Japan Line 3: 9235PX702
0 2017/03/16 13:25:55
What capacitor is on the left? Is that C6? That one looks like it "gave up the ghost". Notice the swelling/deformation along the base.
What capacitor is on the left? Is that C6? That one looks like it "gave up the ghost". Notice the swelling/deformation along the base.
0 2020/02/17 20:06:37
Again, this should be C6 that appears to have a blister around the narrow ring. You can also see the acid ate away the plating on 3 legs (might be DA1).
Again, this should be C6 that appears to have a blister around the narrow ring. You can also see the acid ate away the plating on 3 legs (might be DA1).
0 2020/02/17 20:06:43
A different shot of C6. IC1 is in the foreground. Note the warping of the bottom section of C6.
A different shot of C6. IC1 is in the foreground. Note the warping of the bottom section of C6.
0 2020/02/17 20:06:45
This looks like a good example of a failed capacitor. It should be C6. Note the abnormal blister along its bottom edge.
This looks like a good example of a failed capacitor. It should be C6. Note the abnormal blister along its bottom edge.
0 2020/02/17 20:06:41
Again, the capacitor on the left looks like C6. DA1 and TR7 is front and center. Use an acid brush with isopropyl alcohol along the legs and bottom edge of these components. I see a green tinge on the bottom of TR7.
Again, the capacitor on the left looks like C6. DA1 and TR7 is front and center. Use an acid brush with isopropyl alcohol along the legs and bottom edge of these components. I see a green tinge on the bottom of TR7.
0 2020/02/17 20:06:39
IC4 P/N*: (Stamped Texas Instruments) Line 1: 12903 Line 2: 1ABA (last A is boxed).
IC4 P/N*: (Stamped Texas Instruments) Line 1: 12903 Line 2: 1ABA (last A is boxed).
0 2017/03/16 13:25:56
C3 was previously replaced with this blue Panasonic capacitor.
C3 was previously replaced with this blue Panasonic capacitor.
0 2017/03/16 13:31:52
Different angle of C3 and surrounding components.
Different angle of C3 and surrounding components.
0 2017/03/16 13:31:54
The HUGE Zener diode is ZD6. It's P/N is either 3NB PZ627, PZ627 3NB, or just PZ627.
The HUGE Zener diode is ZD6. It's P/N is either 3NB PZ627, PZ627 3NB, or just PZ627.
0 2017/03/16 13:31:59
Look at the center leg of TR7. It looks like a cold solder joint and/or it could be broken.
Look at the center leg of TR7. It looks like a cold solder joint and/or it could be broken.
0 2020/02/28 20:34:58
Mechanical Pencil points at IC2.
Mechanical Pencil points at IC2.
0 2017/03/16 15:37:49
Mechanical Pencil points at IC7. IC7 is underneath the Odometer Digital Display.
Mechanical Pencil points at IC7. IC7 is underneath the Odometer Digital Display.
0 2017/03/16 15:37:51
One leg of C9 does not look pretty. A proper solder joint should be smooth on both sides.
One leg of C9 does not look pretty. A proper solder joint should be smooth on both sides.
0 2020/02/28 20:35:00
Diodes D2(J3) and D3 need additional info on part numbers.
Diodes D2(J3) and D3 need additional info on part numbers.
0 2017/03/17 08:13:09
0 2020/02/28 20:37:42
IC1 shown here.
IC1 shown here.
0 2017/03/17 08:13:11
0 2020/02/28 20:55:16
VR1 and C5
VR1 and C5
0 2017/03/17 08:13:12
0 2020/02/28 21:49:53