So, I have a Prophet 600 here that arrived
broken after shipping (we have talked to the person who shipped it and he
says it worked before shipping, and he will pay for repairs....and I would at
least like to see if I can bring this back to life). It was also turned on with
the voltage selector in the 220V position plugged into a 110V
receptacle.
and the current symptoms are as
follows:
when you turn it on ALL of the LEDS on the digital
panel light up and stay lit and the number readout comes all on (i.e. it reads
"8.8") and stays on...and no buttons react...and the keyboard makes no
sound.
Basically no resetting or anything can get it out
of this state.
I have gone in and checked the power supply and all
the voltages seem good.
I see waveforms on all the oscillator
chips.
I see clock signal on pins that are supposed to
have clock signal on the digital side. (looking with a scope)
Do people think getting the service manual from
Wine Country will help me?
Could the ROM be toasted? Is there any reasonable
way to see if the ROM is fine? (I have a logic probe....not that I think that
will help)
Any thoughts.....suggestions for strategy? Is there
a way to shut down or bypass the digital side and just make sure the
"synth" is working?
-brendan