Digitech PDS 8000

I got this one for completeness sake after looking at the other PDS series.

The insides are very similar to the PDS 2000, with 4 times the memory. The PDS 8000 schematic is online, but the quality of the scan is so poor that the 2000 schematic is probably more useful.

As arrived, no activity. The reverse polarity diode was shorted, after clipping it out I had 5V at the digital chips but no 9V at any of the analog stuff.

I knew that the 9V supply has a soft-start circuit (as in the 2000) - the JFET was also dead. With a repaired soft-start, the 9V rail was shorted to ground. There is only one 470 uF electrolytic capacitor from 9V to ground, replacing this fixed the pedal. It also got new footswitches as the old ones were prettyy unreliable.