ironside
04-15-2009, 02:20 AM
Group,
Last week, my wife started complaining about the 207 not sounding quite right on rare occasions. She often plays with layered grand piano sounds and uses the sustain pedal constantly. (Fairly demanding on the polyphony I suppose) Her first impression was that the sustain pedal was acting up -- notes dropping off or at least fading away far too soon in the left hand. The problem would progress up the keyboard (l-r) for a few moments, then everything would seem to go back to normal.
However, the problem was not reproduce-able on demand, happening say 3-4 times over a 10 minute period, then once again a couple of hours later, and so on -- seemingly random. I unplugged and removed the pedal assembly to check for visible damage to the pots/circuitry, but nothing out of the ordinary. I plugged it back together, and for whatever reason, the problem is not as frequent, but is still there on rare occasion.
So I ran the C#fG# test routine. All tests check out -- including the 3 pedals -- except test#43 (Rom Check2). It returns a "Sub Program ROM NG" error. The service manual states, rather cryptically, that this is a second test of the "CPU bus" ROM.
Question: what to do from here. I can't find a circuit titles "CPU bus ROM" or anything similar. Mind you, one of the 6 pdf files I have of the manual is corrupted and might contain the very information I need. It is (CVP_209_207_CB2_E.pdf) in case anyone has a good copy.
Does this ROM live on the motherboard, if so, can it be replaced? And at what cost? Are there further diagnostic steps to be taken?
Any help would be appreciated.
Kelvin (in Phoenix)
Last week, my wife started complaining about the 207 not sounding quite right on rare occasions. She often plays with layered grand piano sounds and uses the sustain pedal constantly. (Fairly demanding on the polyphony I suppose) Her first impression was that the sustain pedal was acting up -- notes dropping off or at least fading away far too soon in the left hand. The problem would progress up the keyboard (l-r) for a few moments, then everything would seem to go back to normal.
However, the problem was not reproduce-able on demand, happening say 3-4 times over a 10 minute period, then once again a couple of hours later, and so on -- seemingly random. I unplugged and removed the pedal assembly to check for visible damage to the pots/circuitry, but nothing out of the ordinary. I plugged it back together, and for whatever reason, the problem is not as frequent, but is still there on rare occasion.
So I ran the C#fG# test routine. All tests check out -- including the 3 pedals -- except test#43 (Rom Check2). It returns a "Sub Program ROM NG" error. The service manual states, rather cryptically, that this is a second test of the "CPU bus" ROM.
Question: what to do from here. I can't find a circuit titles "CPU bus ROM" or anything similar. Mind you, one of the 6 pdf files I have of the manual is corrupted and might contain the very information I need. It is (CVP_209_207_CB2_E.pdf) in case anyone has a good copy.
Does this ROM live on the motherboard, if so, can it be replaced? And at what cost? Are there further diagnostic steps to be taken?
Any help would be appreciated.
Kelvin (in Phoenix)