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Zoom 9050 schematics
Anybody have the schematic for a Zoom 9050? I'm getting all sorts of artifacts and noise through some effects even though I swapped the caps on the analog...
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One Control Anodized Brown IC
Anybody happen to know what IC the One Control Anodized Brown distortion pedal uses? I'm getting a high squeal after 12 o'clock on the gain and the IC is...
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Kurzweil Mark 10 keyboard connection issue
So I made a monumentally stupid decision and attempted to disassemble my Mark 10 in order to clean one key, and in the process accidentally disconnected the...
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Marshall Code 25 Schematic
Hi guys,
My Code 25 amps has an issue, as after some minutes after power on (working out loud as normal), then it automatically going in silent....
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1975 MXR Phase 90 - Clock noise?
Hi everyone,
I recently got my hands on an original 1975 MXR Phase 90 PCB, from an old repair shop - it had never been installed. I found a script...
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Maestro G-2 Echo issue
Maestro G-2. What blends the Echo/Repeat function to the audio signal? I'm not getting the repeats, but when engaged the audio becomes a bit louder and...
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Interesting Boss GE-10 issue
Got a weird one here with a Boss GE-10. Pedal functions normally, except the input level switch works but audibly doesn't change anything. Probed points...
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Boss ME-50 issue
Boss ME-50, originally with no power. Found voltage rails but seemed to be missing the 3.3V. Replaced a couple blown capacitors, a blown transistor, and...
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Line 6 FM4 startup issue
Anybody have any thoughts on FM4 that won't kick on? Had a short on the 3.3V line that located to the 56364 IC at U2. Replaced the IC and seem to have proper...
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Glitchy Boss FRV-1 Fender Reverb
Boss FRV-1, bypass works, effect signal works. However, when the effect is on, there is also a repeating, pulsing sound continuously. The sound is similar...
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Boss DD3 Repair Mystery - Signal not passing IC
Hi everyone,
I've been working on repairing a Boss DD3 delay, here is the service manual: https://www.synthxl.com/wp-content/uploads/2018/04...
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Dunlop TS-1 Tremolo question
I took in a buddy's TS-1 Tremolo that's giving me a hell of a time. At this point I'm more annoyed by it, and just bugged to figure out the issue. The intensity...
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1980 EHX Small Stone - Power Filter Issue?
Hi everyone,
I'm currently working on an EHX Small Stone Phaser, made ~1980. I think this is close to the "Issue J" circuit, with "EH1048"...
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Help with Arion SCH-1 Chorus/Vibe Mod
Hi everyone,
I've been working on an Arion SCH-1 chorus pedal from the 80s. It had a sketchy footswitch, so I decided to convert the whole thing...
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Guyatone PS-024 Distortion H schematics
Does anybody have the schematics for the Guyatone PS-024 Disortion H pedal? Something in the back end is almost totally shunting my effect signal.
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Twin Reverb '65 Reissue Reverb Effect Not Working
Help please! My reverb channel doesn't seem to be working properly. I can hear the reverb responding when i tap on the tank but it's not affecting the guitar...
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Yamaha DSC-20M Schematic
Anybody have the schematic for the Yamaha DSC-20M chorus pedal? Pedal works under battery, but plugging adapter in kills all life; D2 diode also does not...
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Squealing / Drill -ish Sound from Amp.
Hey Guys,
so i finally tried to fix my old Valvestate vs100. Iam far away from an Expert. I can repair my guitars and stuff but never tried...Last edited by Jaoon; 05-12-2022, 06:33 PM.
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Bizarre problem: Ibanez CP9 Compressor - No sound when off
Hi everyone,
I'm working on repairing a 1981Ibanez CP9 compressor pedal, with a very strange problem: It works seemingly perfectly when turned...
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Boss DM2 Analog Delay Repair - Low supply voltage
Hi everyone,
I've been working on repairing a version 2 Boss DM2 analog delay, service manual attached. After sorting out a short at the potentiometers,...