3745 MAPs
Power MAP 3930: Power Control Subsystem Problems
Symptom Explanation Conditions That Could Cause This Symptom
Panel display or power indicator
not lit.
Machine will not Power ON.
UEPO
CB1 or any CP tripped
PS2
PCC card or Control Panel
Attention
Power may be present when nothing is dis-
played on the control panel.
Power supplies are sealed replaceable
units.
001
– Check at the control panel.
Are all indicators OFF or **** displayed?
Yes No
002
Go to Step 024 on page 2-23.
003
– Check for the presence of 28 V at the UEPO
switch (see Figure 2-3). Use a CE meter and
check for 28 V between:
Position 5 and the ground of the switch on
the 3745 Models 130-170
Or
Positions A2 and the ground of the switch
on the 3745 Model 17A.
Are 28 volts present?
Yes No
004
– Check the position of CP2 on the primary
power box.
Is CP2 ON?
Yes No
005
–Switch CB1 OFF.
–Switch CP2 ON.
–Switch CB1 ON.
Does CP2 drop again?
Yes No
006
Power ON the 3745.
007
(Step 007 continues)
B1
A1
C1
Battery
Rear View
J1
EPO
1
14
22
5
3
3
6
D C B A
WiringSide
Detail C 01C-C1SW1
Figure 2-3. UEPO Switch
007 (continued)
– Check that the voltage select switch
(01H-B1/SW1) is correct for the
input voltage. Refer to Figure 4-37
on page 4-32.
Is it correct?
Yes No
008
Set the voltage select switch
(SW1) to the correct position.
Go to Step 005.
Chapter 2. Map for FRU Isolation 2-21