IBM RS/6000 SP, Maintenance Information

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MAP 0150: 120/160 Thin Node Environment
006
– One or more of the following conditions exist:
Ÿ Voltage out of range: +2.5 V “shutdownP2_5”
Ÿ
Voltage out of range: +4 V “shutdownP4”
Ÿ
Voltage out of range: +5 V “shutdownP5”
Ÿ Voltage out of range: +12 V “shutdownP12”
Ÿ Voltage out of range:
−
12 V “shutdownN12”
Ÿ CPU card power problem: +2.5 V
Ÿ
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 daughter card
N00-DP-J204 and planar card N00-PL-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 1-63
008
Is this a +5 V, +12 V, -12 V, or planar power problem?
Yes No
009
– Go to Step 037 on page 1-66
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 (black) Pin 2 (black) 5 - 35 Ohms
+12 V Pin 3 (black) Pin 2 (black) 500 - 9000 Ohms
−
12 V Pin 9 (black) Pin 2 (black) 500 - 1200 Ohms
(Step 010 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-61