[sdiy] Schematics for Peavey Spectrum Synth
music at artxtek.com
Tue Jul 28 20:10:43 CEST 2020
I am wondering if anyone has schematics for the Peavey Spectrum Synth.
I just replaced the memory backup battery and did a memory reset/initialisation and the unit was working fine, then I noticed that the 5V voltage regulator was starting to heat up, then the display and LEDs started to flicker and the unit was no longer working.
I tested PSU, +15V is ok , but -15V is running at -7V and the +5V is reading 0.3V - all measurements from the voltage regulator output pin.
As I understand it from other synths, the 5V is for the logic chips and the +/-15V is for the audio side.
At the moment I am thinking that either capacitor(s) have failed or one (or more) of the 74HC or HCT have failed and are shorting the 5V PSU, although the -15V issue maybe capacitor failure.
Anyway, if anyone has schematics I would be grateful.
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Synth-diy