From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2005-12-07 01:50:38
>>>>> "M" == MagerValp <MagerValp@cling.gu.se> writes:
M> * 250407 board.
M> * PSU is fine, I measure 9.4 VAC at the power connector, and 5 V on
M> the user port.
M> * With the fuse removed, I measure 9.4 VAC across C21.
M> * With the fuse in place, I measure 2.0 VAC across C21, but this
M> fluctuates a bit (0.6 - 2.1 VAC).
M> * With the fuse in place, I measure 0.15 V across pins 2 and 3 on VR1,
M> the 7812, and this also fluctuates a little.
M> * I tried removing the VIC and the SID, which I believe are the only
M> 9/12V ICs, and it didn't have any effect.
I did some more measurements:
* 1.1 V across C19.
* 0 V across C90.
* 1.1 V across C88.
My 1982 board measures 10/10/17 V. It looks like CR4 could be the
culprit (likely, unlikely anyone?). It's a PITA to desolder, but at
least it's cheap to replace...
--
___ . . . . . + . . o
_|___|_ + . + . + . Per Olofsson, arkadspelare
o-o . . . o + MagerValp@cling.gu.se
- + + . http://www.cling.gu.se/~cl3polof/
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