IBM RS/6000 SP, Maintenance Information

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MAP 0140: Thin Node/Thin Node 2 Environment
006 (continued)
One or more of the following conditions exist:
Voltage out of range: +4 V “shutdownP4”
Voltage out of range: +5 V “shutdownP5”
Voltage out of range: +12 V “shutdownP12”
Voltage out of range:
−
12 V “shutdownN12”
CPU card power problem: +4 V
Planar power problem: +5 V, +12 V, or
−
12 V
– Place processor node in service position.
– Check planar power cable connections at node supervisor card N00-NS-J102 and I/O planar N00-PL-J2.
Also check condition of cable wires.
– If this is a problem involving a +4 V supply, check cable connections at node supervisor card
N00-NS-J204 and CPU card N00-PR-P3. Also check condition of cable wires. Check daughter card
connections from N00-NS-J103 to N00-DP-J203.
Do power cable(s) appear to be okay?
Yes No
007
– Fix power cable problem. Replace cable if necessary.
– Go to Step 018 on page 1-53
008
Is this a +5 V, +12 V, -12 V, or planar power problem?
Yes No
009
– Go to Step 037 on page 1-56
010
– Disconnect planar power cable N00-NS-P102 from node supervisor card inside processor node.
– Using a digital multimeter, measure resistance between the appropriate pins on cable N00-NS-P102.
Pay attention to which leads to use when measuring resistance. Compare results with the values in this
table.
– Do not reconnect the planar power cable at this time.
Voltage
Measure From (positive
lead)
To GND (negative lead) Acceptable Range
+5 V Pin 1 (red) (see note) Pin 2 (black) 5 - 35 Ohms
+12 V Pin 3 (yellow) (see note) Pin 2 (black) 500 - 9000 Ohms
−
12 V Pin 9 (purple) (see note) Pin 2 (black) 500 - 1200 Ohms
Note: Pins 1, 3, and 9 are black in the 120 and 160 MHz thin processor node.
Is the measured resistance in acceptable range?
Yes No
011
(Step 011 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-51