IBM FlashSystem 900, Service Manual

Page: 262 / 546

3746-900 MAPs
3746-900 Power MAPs
MAP 5100: 3746 Model 900 Power Control Subsystem Problems
Symptom Explanation Conditions That Could Cause This Symptom
Machine will not Power ON.
Ready or standby LED not lit.
¹
UEPO
¹
CB1 or CP1 tripped
¹
ACPW or DCPW
¹
Any CBSA card or control panel
¹
SPD1 or Basic board
¹
SPS
FUNCTIONAL NOTE
Power may be present when nothing is dis-
played on the control panel.
001
– On the 3746-900 control panel.
Are the ready and standby LEDs OFF?
Yes No
002
Go to Step 025.
003
– Check the position of CB1 on the basic ACPW
box. See Figure 2-2 on page 2-5.
Is CB1 in the ON position ?
Yes No
004
Go to Step 020.
005
– Refer to Figure 2-1. Check the ac main voltage
on TB1 of the transformer.
Between pin and pinif input is
1 2 200 v
1 3 220 v
1 4 240 v
Figure 2-1. TB1 and TB2 Location on Transformer
Is the voltage correct?
Yes No
006
The customer power supply is defective.
Also check that the ac cable is correctly
seated in J2.
007
– Check CP1 on the AC box. See Figure 2-2 on
page 2-5.
Is CP1 in the ON position ?
Yes No
008
Continue at “MAP 5130: 3746-900 CP1
Tripped.” on page 2-14.
009
– Check CP2 and CP3 on the DCDP. See
Figure 2-2 on page 2-5.
(Step 009 continues)
2-4
3746-900: Service Guide