Roland GS-6 fault

[Uncle Krunkus]

I just scored a Roland GS-6 guitar FX rack mount for $20.
The power is fine and getting to all the boards.
Sometimes when powered on the display flashes but it is generally blank.
All obvious problems like connector issues, burnt components etc have been eliminated (there were none).
I'm thinking the EPROM may be scrambled. Does anyone know how I might get a new one? Does anyone know how I could be sure that's the problem?

[Uncle Krunkus]

Well,
you've all had plenty of time to chime in with advice about how to fix this thing. It's interesting that there is absolutely nothing coming out of it at all. This leads me to think that everything it outputs comes back to the analogue board's DAC from the big Roland chip on the digital board.
It's a pity really, 'cos it looks so nice and clean inside. I sit staring at it wondering if there's just one simple little thing which is keeping it silent. I've even asked it what is wrong. I feel like 'the chip whisperer'.

Anyway, I'm now starting to wonder about the possibility of turning it into something else. (sooner or later my inner Dr Frankenstein must be released )

It has a good looking PSU with +/-15V & Regulated 5V feeds.
The front panel includes 7*10K pots. various push buttons and a 7seg*3 display.
The analogue board includes a PCM54HP 16bit DAC.

Any suggestions?

[elektro80]

I have no idea. Right now I am looking at 2 black plastic garbage bags full of a CS80 ( ..roadkill.. literally ) and a big carton full of parts that might be useful.. or not.