Sharp GF-555 alpd troubleshooting

[Josh9994]

I have so far replaced D807 and have now got 15 volts to the Alpd circut. Now I have the track selector switches working.

 

[Funkateer38]

Hello, i have same problem but i cannot find this diode to buy. Where do you find it please ? thank you

 

[Josh9994]

I used a Motorola 1N962B 11V 400mW silicon Zener Diode DO-35 package for D-807. After replacing that the Alpd counter started to work and it would count down the tracks. I never tracked down why the solenoid was not activated to stop the search. Someday I'll dig deeper and figure it out all the way.

 

[Josh9994]

I'm pretty sure something got shorted out on the grounded shield on the back cover. The sheild was a bit warped from possibly getting wet before I got the machine.