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9050 Diagnostics
5-9
Power Indication LEDs
This chart shows the LEDs that are lit for various power supply conditions. It also indicates which
board is the most likely faulty component.
A "I" in the Fault Location column indicates the Stack PS board.
A "2" in the Fault Location column indicates the Main PS Assembly.
A "3" in the Fault Location column indicates the motherboard, or the rest of the sytem.
An undervoltage condition may require the unplugging of stack and
lIO
boards in order to deter-
mine whether a short is in the power supply or the load. A minimum power supply load must be
maintained and the fans must be connected. Any three of the following will maintain the power
supply load:
• One Cpu.
• One lOP.
• Two 512K RAM boards.
• SCM board.
• 09855-66525 load board (used with
9020/9030/9040).
Power Indication LEDs Chart
Stack
Power
PS
OT
ON
18
Fault
Fault
LED
LED
LED
LED
Location
(normal)
off
off
on
on
- 2V undervoltage
on
off
off
on
1,3 (short)
- 2V overvoltage
on
off
off
on
1,3 (short)
6.7V undervoltage
on
off
off
on
1,3 (short)
6.7V overvoltage
on
off
off
on
1,3 (short)
3.85V undervoltage
on
off
off
on
1,3 (short)
3.85V overvoltage
on
off
off
on
1,3 (short)
Stack overtemp
off
on
off
on
CPU, Fan, or 1
Main supply overtemp
off
on
off
on
Fan, 1, or 2
19V undervoltage
off
off
off
on
1,2, or 3
19V overvoltage
off
off
off
on
1,2, or 3
- 12V undervoltage
off
off
off
on
1,2,or3
5V undervoltage
off
off
off
on
2
Overcurrent
off
off
off
on
1,2, or 3
+
12V undervoltage
off
off
off
on
1,2, or 3
Line fuse open
off
off
off
off
2
IB fuse open
off
off
off
off
2
Cable disconnected
off
off
off
off
1,2
Voltage Selector at
nov
Selector Switch
(220Vinput)
off
off
off
off
Fuse
Voltage Selector at 220V
Selector Switch
(110V input)
off
off
off
on
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