IBM 3274 51C Maintenance Information page 67

~
I
Map A122 Power On Ind. is
Off and Fan Not Turning
PAGE 5 OF 6
016
• Switch power off.
• At CR-1 diode reconnect previously removed push pin to the
+
terminal.
• At TSR power supply No.1, disconnect push pin from terminal
E1. -F-
• At TSR power supply No.2, disconnect push pin from terminal
E1.
-F-
• Switch power on.
Does fuse still blow?
Y N
017
• Switch power off.
• At TSR No. 1 reconnect previously removed push pin to
terminal E1.
·H·
o
Switch power on.
Does fuse still blow?
Y N
018
o
Switch power off.
• At prime power box reconnect previously removed plugs
P2 and P5. (P5 U.S. and Canada).
o
Replace power supply No.2. See Figure
4-9.
Go To Map A100, Entry Point A.
019
• Switch power off.
o
Replace blown fuse.
o
At prime power box reconnect previously removed plugs P2
and P5. (P5 U.S. and Canada).
• At power supply No. 2 reconnect previously removed push
pin to terminal E1.
• Replace power supply No.1. See Figure 4-9.
Go To
Map
A100, Entry Point A.
020
o
Switch power off.
·G·
• Replace blown fuse.
• At power supply No. 1 and No. 2 reconnect previously
removed push pin to terminal E 1.
• At prime power box reconnect previously removed plugs P2 and
P5.· (P5 U.S. and Canada).
o
Replace filter capacitor C-l, See Figure 4-8.
Go To Map Al00, Entry Point A.
3·40
MAP A122-5
·H·
Determines which of the two TSR power supplies is causing
blown fuse.