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Howdy all, name's Six. First time poster, long time lurker. In between customer repairs I've been working on my own project, a 1979ish JC160 I picked up in a poor state. I've managed to solve a few of the issues including a rebuild of the power supply, repairing the reverb and getting the modulation to work more than it was previously.
Thankfully I have a copy of the correct schematics and service manual but I'm at a bit of an impasse with the Chorus/vibrato.
I replaced the CMOS chips (4011 and 4013) as I wasn't getting a clock signal. Now I've got a clock and the cjorus and vibrato work somewhat. The voltages and frequencies are wrong however with basically all the waveforms. My clock is running near 330KHz and the voltage swings for the various waves and LFOs are very low. The moment the chorus or vibrato is activated it comes on but there's about a 4-5dB drop in volume and a very noticeable 'whooshing' sound. The vibrato is there but it's not as potent as it should be. The Chorus is weak and hardly audible.
Anyone who's had similar issues and resolved them or if anyone has any recommendations as to what to check out first I'd be greatly appreciative.
Thankfully I have a copy of the correct schematics and service manual but I'm at a bit of an impasse with the Chorus/vibrato.
I replaced the CMOS chips (4011 and 4013) as I wasn't getting a clock signal. Now I've got a clock and the cjorus and vibrato work somewhat. The voltages and frequencies are wrong however with basically all the waveforms. My clock is running near 330KHz and the voltage swings for the various waves and LFOs are very low. The moment the chorus or vibrato is activated it comes on but there's about a 4-5dB drop in volume and a very noticeable 'whooshing' sound. The vibrato is there but it's not as potent as it should be. The Chorus is weak and hardly audible.
Anyone who's had similar issues and resolved them or if anyone has any recommendations as to what to check out first I'd be greatly appreciative.
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