Need help: DSD-440 with unresponsive formatter/control board
jsw at ieee.org
Tue Sep 20 14:25:33 CDT 2016
On Sep 20, 2016, at 2:02 PM, Julian Wolfe <jrw at lolqb.us> wrote:
> After reading this section, I should probably bring up that when I checked the PSU voltages, the 5v+ line was low, at 4.7v or so. I adjusted it back to 5.05v on the pot as defined in the manual, and there it stayed steady, but it didn't seem to help. Before I adjusted the pot, it was fluctuating.
Given the age of the unit, its not surprising that the potentiometers are a noisy, have drifted/aged and/or are contaminated with crud.
SYSTEM Reset L should be High. If Not then Check for 1.1V on THR.
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