Hi Ed:
Yes, all the supply voltages are within spec, but the error message stays the
same.
The Outguard supply visually looks OK and the voltages are centered in the spec.
Yes the transformer has seven wires feeding the outguard p.s.
See: http://www.prc68.com/I/HP3458DVM.shtml#Bot
You may need to <shift><reload page> to see it.
Have Fun,
Brooke Clarke
http://www.prc68.com
Ed Palmer wrote:
You're right. Sorry.
Brooke, now that you know the source of at least this problem, have you
considered powering up the system by applying DC to the inputs of the
regulators? This would allow you to limit the current in case there's
been some damage further in.
Also, is the Outguard p.s. connected to the same transformer? I would
expect to see a similar circuit topology on both supplies. Is there any
heat damage on the Outguard p.s.?
Ed
J. Forster wrote:
Look at the Ohms readings. It's not open, if the readings are right.
-John
=============
Try putting a light load on the transformer when you measure the output
voltage (maybe 1K). You may find that terminals 2-3 are open circuit
rather than short. Maybe that's why CR10 survived - the transformer
blew first.
Ed
Brooke Clarke wrote:
Hi John:
It's hard to say. With the A4 Inguard p.s. board removed when powered
up the fan comes on and the display lights up with the error message.
So, measured on the primary side, there's 25 ma AC current going to
the transformer then to the Outguard p.s. and fan.
Have Fun,
Brooke Clarke
http://www.prc68.com
J. Forster wrote:
Looks like it. Does the transformer draw much current with the PCB
removed? If it has shorted turns, as it appears, it likely will. Does
it
get hot?
-John
=================
Hi:
I think the power transformer got cooked. Have a look at the Vac
and Ohms
data: http://www.prc68.com/I/HP3458DVM.shtml#T1
Force a browser refresh to see the latest schematic.
Have Fun,
Brooke Clarke
http://www.prc68.com
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