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Odometer repair

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Epyontronic

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I need help finding equivalent parts to repair my Odometer to one of my cars. So the problem was that the Odometer display wouldnt show, stopped working. Everything else on the gauge cluster worked. When I took it apart, C3 Capacitor was blown. I went ahead and replaced the surrounding Capacitors being 10uf/50v as listed below. Plugged everything back in and still nothing. So I took apart again and checked all connections, all the surface mount chips had good connections. I checked the below described diodes and transistors. Used my desolder gun to remove them and check with meter as they looked corroded and two of them pretty much crumbled when removing (the leads that is). So now I am stuck needing replacements.

So this was taken from another forum. I need to know TR6, DA1 and DA2 (in red lettering below) equivalent replacements. This is for a 1993 Mazda RX7 car. This is the only information I have, so i dont know any more about the diodes and transistors.


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*

Thanks,
Brent
 

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Epyontronic

New Member

RODALCO

Well-Known Member
Check C3,those gold coloured Electrolytic are prone to failure. and may have caused downstream damage on the board.
That Z623 diode is massive, what is that feeding ?
 

Epyontronic

New Member
Thanks for the help Rodalco.

To Be honest I have no clue what that monster Diode is providing, but I think it is good still.

I ended up just buying a used cluster in Km, hopefully it will be working still, if not, maybe able to use the parts from it. I bought those parts listed in the bay links to try it out first. Good news is that my DA1 (P209) is still good, so i should be able to reuse it. It reads NPN if I remember right, with readings of .5-.6 on each end. Ill have to go check again for more accurate numbers
 
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