Help Please! I haven't made any mods yet but last evening during band rehearsal it started making intermittent "popping" sounds. I unplugged the guitar at the amp input jack and the popping continued (about 1 "pop" per second). I turned the amp off and back on again and the popping continued. I only know enough electronics to be dangerous and so am hoping you can advise me where to begin looking for the problem. This was on the clean setting, no reverb, bass--mid-treble set to 5 - I haven't tried the dirty setting.
Any suggestions would be greatly appreciated. [http://support.fender.com/schematics..._schematic.pdf[/URL]
Thanks
Any suggestions would be greatly appreciated. [http://support.fender.com/schematics..._schematic.pdf[/URL]
Thanks
I'm afraid the link you provided does not work; here's another one: http://support.fender.com/schematics/guitar_amplifiers/Princeton_112_Plus_schematic.pdf
Try to isolate the problem; e.g:
- check power supplies (with a scope)
- check the SEND output if the popping can be heard there (if yes, it's in the preamps somewhere),
- check the RETURN input ditto to see if it's in the poweramp or not.
- After that, measure inside the amp with a scope to check various stages to see if the popping can be isolated.
Be careful with live voltages!
I have the same amp, use it for weekly rehearsal but have not yet had any issues.
Try to isolate the problem; e.g:
- check power supplies (with a scope)
- check the SEND output if the popping can be heard there (if yes, it's in the preamps somewhere),
- check the RETURN input ditto to see if it's in the poweramp or not.
- After that, measure inside the amp with a scope to check various stages to see if the popping can be isolated.
Be careful with live voltages!
I have the same amp, use it for weekly rehearsal but have not yet had any issues.
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