[volt-nuts] 3458A AC board

[Greg Burnett]

Randy wrote:
There are two soldered-on fuses on the AC board: F701 seems okay (ohm meter 
sees a short), F702 is open (blown).  Anyone have an idea what this fuse is 
for?
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Randy, F702 is a 0.125A fuse between raw -18V and the collector of Q702, 
which is the -17V regulator. So I'd first measure the resistance from board 
ground to the emitter of Q702. It it's a short (or nearly so), you'd want to 
follow the -17V line to see what's holding it down. First thing to look at 
would be the 15uF capacitor (C709) running from the emitter of Q702 to 
ground.

F001, F002 and F003 are indeed spare fuses, so you can use one of them to 
replace F702.

Let us know what you find.

Greg