H744 +5 supply - easy to fix?

From: Gooijen H <GOOI_at_oce.nl>
Date: Thu Mar 4 01:22:58 2004

Just my 2c.
I repaired 2 H744's up till now.
They are indeed an easy piece to work on.
One had a defective rectifier bridge (the 1 x 1 inch square
block with 4 terminals) and the other was more peculiar:
one big electrolitic capacitor (AFAICR it is connected
directly to the PCB, fixed with screws) made a short circuit
between the housing of the capacitor and a trace on the
board. The plastic insulation of the capacitor some how was
that bad to allow the short circuit ...!

  success with your repairs,
- Henk, PA8PDP

> -----Original Message-----
> From: Brad Parker [mailto:brad_at_heeltoe.com]
> Sent: woensdag 3 maart 2004 22:39
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: H744 +5 supply - easy to fix?
> I finally got my TS11 racked this morning and after a good cleaning
> found that it has no +5v. (I must say, I love DEC manuals...)
> Looks like the H744 supply is not working. Anyone know about these?
> Are they easy to fix? Should I just pull it, find a schematic and
> start probing?
> (anyone have one they want to part with? :-)
> thanks!
> -brad
Received on Thu Mar 04 2004 - 01:22:58 GMT

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