dpb@tellab5.tellabs.CHI.IL.US (Darryl Baker) (08/18/89)
I've just finished disecting the blown power supply I had earlier last
week. Well my companies power supply expert found a blown SCR (MCR72)
in what he believes is the high voltage limit circuit but it is hard to
decipher the circuitry. Anybody out there have the schematics so we(he)
can fix it?
--
__ _ __
/ ) // / ) /
/ / __. __ __ __ , // /--< __. /_ _ __ Darryl Baker
/__/_(_/|_/ (_/ (_/ (_/_</_ /___/_(_/|_/ <_</_/ (_ dpb@tellab5.chi.il.us
/ on the injured reserve list-> dpb@liltyke.chi.il.us
'thad@cup.portal.com (Thad P Floryan) (08/20/89)
Darryl Baker is asking for schematics of the UNIXPC power supply ...
The schematics are NOT in the UNIXPC Reference Manual. :-(
Near as I can tell, the power supply was intended to be a throw-away.
Perhaps the San Leandro repair facility can provide more help.
The "stock" power supplies are manufactured by Power Systems, Inc.
From two of my previous postings:
For reference, the power supplies in the 3B1 and the 7300 *ARE* different.
Specifically:
The 3B1 power supply is mfd by Power Systems, Inc. and is their model PS 1610-1
(Convergent part number D-65-00056-1, Rev. B). Its specs:
90-130 VAC, 245 Watts, 58-63 Hz
+5 VDC at 20 Amps
+12 VDC at 5 Amps
-12 VDC at 300 mA
The 7300 power is also mfd by Power Systems, Inc and is model PS 1569
(Convergent part number D-65-00042-00, Rev. E). Its specs:
90-130 VAC, 58-63 Hz
+5 VDC at 20 Amps
+12 VDC at 3.5 Amps
-12 VDC at 100 mA
A: Although I'm not certain this is the same subcontractor who mfd'd the
UNIXPC's power supplies, I have found this entry in one of my various
buyer's guides:
Power Systems, Inc.
12 Tobey Road
Bloomfield, CT 06002
ph: 203/243-0357
TWX: 710/425-8778
Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]