It lights up but there is no effect. I can still play thru it but and hear the guitar. I have replaced IC2 chip with no difference. Everything else looks normal. I have resolderd all connections. I get nothing thru a or b jacks. Could there be a problem in the stomp switch? Any suggestions other than throw it away.....lol?
Hi sweatyk, I see when you stomp the switch LED is lights up <--> down or still lit? Pedal pass the sound only when effect is off? If you have an analog version of CH-1 try check and replace an opamp IC5 M5218L or similar. Try describe more precision your problem. Regard - Luke.
Ok guys here are the answers. The pedal was given to me in this condition with no history. On my dianosis it was quite some time ago but it seemed logical based on the schematic. It was kind of a shot in the dark. I used to work for a place called PTS electronics back in the late 70's early 80's repairing television module circuit boards. Sort of a rebuild shop for the local tv repair shops. I have basic electronic skills. Equipment on hand is a soldering station and digital multimeter. I've always been a tinkerer and will tear almost anything apart to see if I can fix it. Most of the time I get lucky. I'm not real technical when it comes to troubleshooting but I'm very observant looking for the obvious, cold solder joints, off value resistors, things like that. I really appreciate you guys chiming in and trying to help.
And for Lu9 I will post the serial number on here when I get home. Maybe you can tell me which it is.
Also sorry about getting the serial number on here. I took off for camping deep in the woods. Just got back. Now I just plugged it in to check it again and there is no volume difference when turning it off and on. However the is a very very slight tonal difference when I do that. Don't know it that will be of any significance or not.
Well I found some polarized caps that were leaking. So I replaced all of those (15 total) but still no change. I'm assuming that the case is ground and I took voltage readings on IC5. These were the results:
I'm not sure if I'm doing this correctly so please someone let me know if this is right. I might have this backwards but I could not tell which was pin 1 and pin 8.
Would it also be recommended to replace those old clear looking square caps?
Also so wanted to note that when I adjust the E.Level and EQ and Depth knobs there is some response however none from the Rate knob.
Those voltages sound normal to me. pin8 is conected directly to the battery and pin4 is ground. The other pins are DC-wise typically at half the supply voltage so no surprises there.
I was looking at the schematic after the rate knob had no response. I don't have an oscilloscope but I was thinking about IC4. I'll do what I can to scrounge one up and see. I'll post back when I get to that point. Thanks again guys for the input.
Need help with a ch-1
Posted - 02/11/2009 : 22:52:18
