I have a Boss CE-1 from 1980. It did work but I decided to recap it. Yep you guessed it, now it has a problem. The chorus still works fine. The vibrato only works for about a second before the oscillation stops. I still have sound. When engaged it LED blinks rapidly before it goes dark. If you adjust the rate it will blink faster before it goes dark. Hit the switch again to go back to chorus and it works just fine.
I did find a copy of the schematic. Now I am new to this and although I can slowly read a schematic, transferring that information to the PCB is beyond me. I can guess but I am not a fan of this. The best copy of the schematics I could find is still difficult to read as it is a poor copy for the small print. I have been unsuccessful finding a component layout for the PCB board.
The only thing I can find about the vibrato on the schematic is that it is related to caps C34 & C35. I do have a digital scope (not good at using it) and I can not get a signal from pin 7 of IC4. I can when using chorus and it looks to be fine. Just by guessing and process of elimination I found IC4. I really need the PCB layout. I believe I know where C34 & C35 are; again guessing. Those caps are installed correctly (polar) and are the correct uf and voltage.
So any of you folks out there have any idea what could be wrong? Like I said it did work but due to the age I wanted to recap it and put in the 500k pot as I use this for guitar.
Thanks for your time.