Gen2n3

iTrader: (1)

Good morning Members,

I'm at it again with a list of components for the FD tachometer circuit board. First, here's an old link for the https://www.rx7club.com/3rd-generati...c-info-405772/.

This is a partial part number list because there are some components on the backside of the circuit board that I cannot access without destroying the tach. If someone has a circuit board with full access to both sides, then please post your findings.

Here are the part number breakdowns:
IC1: AN8352UBK
C1: 1uF, 50V electrolytic capacitor, DigiKey P/N: 493-14556-1-ND
C5: 153J50 (.015uF, 50V, ceramic type) DigiKey P/N: 399-4161-ND*
VR1: 204:37
D2(J3): Green, Blue, Blue (1N566)**
D3: C2***
Motor: 24024-16

* - Closest match on DigiKey to the part number on the capacitor.
** - This link Diode identification shows a figure with color codes for diodes. Based upon this site, a partial part number of 1N566 was derived.
*** - Partial part number.

If anyone has more accurate info regarding the diode part numbers and capacitor C5 then post your findings below.

Photos of the board are posted below.

Cheers,
George

Gen2n3

iTrader: (1)

Diodes D2(J3) and D3 need additional info on part numbers.



IC1 shown here.



VR1 and C5



C1 is a 1uF, 50V capacitor.



Tachometer motor

Gen2n3

iTrader: (1)

This is an updated part numbers list that adds C5.

CAUTION: Refer to FD Speedometer-Odometer Post #25 for more info on C5 before replacement.

IC1: AN8352UBK
C1: 1uF, 50V electrolytic capacitor, DigiKey P/N: 493-14556-1-ND
C5: 0.015uF, 50V, film type, Mouser P/N: 80-MMK5153J50J01TA18*
VR1: 204:37
D2(J3): Green, Blue, Blue (1N566)**
D3: C2***
Motor: 24024-16

* - Closest match on Mouser to the part number on the capacitor (153J50).
** - This link, Diode Identification shows a figure with color codes for diodes. Based upon this site, a partial part number of 1N566 was derived.
*** - Partial part number.

Gen2n3

iTrader: (1)

This post provides a cross-referenced link to "Troubleshooting the FD Speedometer-Odometer-Tachometer Circuit Board" thread, Post #34.
Here it is: https://www.rx7club.com/3rd-generati.../#post12217648

That post answered my question regarding the availability of IC1's chip, AN8352UBK, from the original manufacturer, Panasonic. In short, the chip is obsolete and no replacement exists. Therefore, the only way to replace IC1 is through cannibalization from other tachometer boards or from a different car that uses the same chip. The parts list will be updated to reflect IC1's unavailability.

This 2nd link separated from the parts list that provides a caution remark when replacing C5.
https://www.rx7club.com/3rd-generati.../#post12201933

This 3rd link provides diode identification that shows a figure with color codes for diodes. Based upon this site, a partial part number of 1N566 was derived for D2(J3).
Diode identification

Cheers,
George

Gen2n3

iTrader: (1)

This is an updated part numbers list that provides amplifying remarks for IC1, C5, and D2(J3).

IC1: AN8352UBK, Obsolete Part Number, no known replacement, (1)
C1: 1uF, 50V electrolytic capacitor, DigiKey P/N: 493-14556-1-ND
C5: 0.015uF, 50V, film type, Mouser P/N: 80-MMK5153J50J01TA18 (2)
VR1: 204:37
D2(J3): Green, Blue, Blue (P/N: 1N566) (3)
D3: C2 (4)
Motor: 24024-16

(1) - Refer to Post #4 for information regarding IC1 part availability.
(2) - CAUTION. Refer to Post #4, "2nd Link". This provides a caution remark when replacing C5. Original marked P/N on capacitor: 153J50.
(3) - Refer to Post #4, "3rd Link". This provides information to decode diode color codes.
(4) - Partial part number for D3.

pietrino

iTrader: (1)

Thanks to George advice I finally fixed my Tachometer.

For guys like me that removed the needle and then lost the correct position.
I found, after many tries, that the end scale of the needle should be approximately that the back of the needle should point about 3300rpm

Aramir

So does this mean that the original c5 part number does not work as a replacement? (399-4161-ND)

Gen2n3

iTrader: (1)

@Aramir,

The part number for the capacitor may be in stock. However, if it is not in stock then use an alternate part number. Both Mouser and DigiKey will usually show alternate part numbers. Otherwise, you can search for the proper component based on the specs that are listed in this thread.

Does that help you?