On Wed, 27 Jul 2011 18:36:27 +0100, "Gareth Magennis"
put finger to keyboard and composed:

I have a Roland drum machine in for repair. The machine powers up and goes
through the Operating System upgrade, up to the point the Flash is written
to, where it fails and the unit will not boot, showing a "damaged memory"
warning. I suspect the Flash chip is faulty.

If you can read the flash memory, then checksum its contents. You
could also inspect the contents for misspelt text strings.

Another thing to try is to lift the chip's clock pin (serial flash),
or its CS or OE pin (parallel flash). If the machine's symptoms remain
the same, then it's a good bet that the flash is bad, or its supply
has too much ripple.

An internal inspection shows around 10 caps around the internal power
supplies are bulging and have leaked guff onto the PCB. The 3.3v rail is at
over 4 volts, so presumable the regulator is toast.

If the regulator is linear, then I'd say it is faulty. Otherwise, if
it is a switchmode type, then it could be a capacitor issue.

- Franc Zabkar
--
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