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9533 PSU Specs
Test The PSU
Power P1 Connector
Power P2 Connector
Hard Drive P3
Power Connector
Open PSU
Close PSU
9533
PSU Specs
IBM PN 39G6534 / FRU 39G6560
PSU is made by Minebea Electronics, Ltd. PCB is marked
CMKS-171X
F1 is 3.15A 250v T HBC
Input
100-125v ~ 0.7A
200-240v ~ 0.35A
50/60Hz
Output Max
Power is 24W
+5v 4.17A
+12v 0.12A
-12v 0.12A
-5v 0.11A
Test The PSU
If the power-on indicator is not on, check the
power cord for proper installation and continuity. (If the
power-on indicator is not on, but the computer is
functioning normally, replace the power switch/speaker
assembly.)
Check for continuity between pins 4 and 6 (switch) on
P2. If the switch is OK, short pin 4 to pin 6 on
P2 and check the power supply voltages.
Power
P1 Connector
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+Lead Pin
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-Lead Pin
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Vdc Min
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Vdc Max
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1, 2 (+.5 volts)
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Ground
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3.75
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+6.25
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3, 4 (Ground)
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Ground
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Power
P2 Connector
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+Lead Pin
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-Lead Pin
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Vdc Min
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Vdc Max
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1, 2 (+12.0v)
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Ground
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+ 9.0
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+15.0
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3 (Power Good)
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Ground
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+ 2.4
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+ 5.25
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4 (On/Off Signal)
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Ground
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+ 1.0
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5 (-12.0v)
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Ground
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- 9.0
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- 15.0
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6 (Ground)
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Ground
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7 (-5v)
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Ground
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-4.75
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- 5.5
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Hard
Drive P3 Power Connector (on IDE Drive
Cable!)
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+Lead Pin
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-Lead Pin
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V dc Min
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V dc Max
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1 (Ground)
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Ground
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2, 3 (+5v)
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Ground
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+3.75
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+6.25
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Open
PSU
Remove sheet metal screw on inner side with small
Phillips. Note the two pin port? My guess is a
Wake-On-LAN...
Remove small sheet metal screw on outer side. Note
that there is a rivet holding the top side to the
outer side, right next to the power connectors.
Drill the rivet out.
Remove the two small phillips screws that thread
into a heatsink.
Note: If you
leave these two screws in, the PSU will not open.
The PSU PCB is actually fastened to the top cover!
Now pivot top on rear lip.
The top cover hooks over a lip on the rear of the
PSU case. You do NOT have to unscrew the AC socket!
Top view of opened PSU. Note the inverted "L" shaped
heatsink, with the two threaded mounting holes?
There is a small PCB mounted at the front of the
case. It provides the -12v DC. Blue lead, -12v DC,
cream lead is -12v Ground.
Close
PSU
Pretty much in reverse.
Hook the rear wall of the PSU over the lip on the
bottom. Rotate the top cover down until it seats on
the frame in front. Start the threaded heatsink
screws on the bottom of the PSU first. Now you can
adjust the top of the case a little so you can start
the metal screws.
Once all 4 screws have been started and slightly
snugged, tighten the heatsink screws, then the top
cover metal screws. Done.
The two threaded screws are used to attach the
bottom of the PSU case to a heatsink. Two positives:
first, the PSU will be more rigid, second, the frame
is now thermally bonded to the heatsink. In effect,
making the case part of the heatsink...
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