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3745 MAPs
Power MAP 3920: Air Flow Detector Fault
Symptom Explanation Conditions That Could Cause This Symptom
Air flow detector fault for Fan1 or
Fan2
Fan1 or Fan2
PCC
PS2
Tripped CP3
001
If the problem is intermittent, consider that any of
the conditions given in the above table can cause
the problem.
Panel code 030 indicates Fan1.
Panel codes 031 or 032 indicate Fan2.
Is the code 030 displayed?
Yes No
002
– Disconnect the Fan2 power cable from
the front side of the power supply 2,
(location 01H-J6). Refer to Figure 4-37
on page 4-32.
– Check for the presence of -38 V dc
between pins 1 and 2 of the power supply
2 (PS2) connector J6 while attempting to
power ON the machine.
(Pin 1 ground and pin 2 -38 V.)
J6
J7
12
12
Is voltage present and within
tolerence ± 10%?
Yes No
003
– Reconnect the Fan2 power cable to
01H-J6.
– Exchange the PS2. Go to “PS2
and Primary Power Box Exchange
Procedure” on page 4-69.
004
– Reconnect the Fan2 power cable to
01H-J6.
– Check cable from 01A-Y0A1 to 01E-J1 for
correct setting. If this cable is correctly
fitted, exchange the FRU group 41 “3745
FRU Group Table” on page 1-49.
005
– Disconnect the Fan1 power cable from the front
side of the power supply 2, (location 01H-J7).
Refer to Figure 4-37 on page 4-32.
(Step 005 continues)
005 (continued)
– Check for the presence of -38V dc between
pins 1 and 2 of the power supply 2 (connector
J7) while attempting to power ON the machine,
(Pin 1 ground and pin 2 -38 V).
J6
J7
12
12
Is voltage present and within
tolerence ± 10%?
Yes No
006
– Reconnect the Fan1 power cable to
01H-J7.
– Exchange PS2. Go to “PS2 and Primary
Power Box Exchange Procedure” on
page 4-69.
007
– Reconnect the Fan1 power cable to 01H-J7.
– Check the cable from 01A-Y0A1 to 01K-J1 for
correct setting.
If this cable is correctly fitted, exchange the
FRU group 40 “3745 FRU Group Table” on
page 1-49.
Chapter 2. Map for FRU Isolation 2-19