IBM 5280 Manual page 283

IBM 5285 POWER MAP
D.C. DISTRIBUTION MAP
PAGE 1 OF
3
ENTRY POINTS
FROM
I
ENTER THIS MAP
-------+----------------------
~~:.---
I
:~~~.~
PN ..
AU"I:~;;w ~!.~~--
Nun!:)!;/(
I
/"U.l.N I , ...... "
NUM~I;I<
-------+----------------------
8000
I
A l D O l
001
(ENTRY POINT A)
Is fuse F4 open?
Y N
002
Is CBl tripped?
Y N
003
Is fuse Fl open?
Y N
004
Is fuse F2 open?
Y N
005
Is fuse F3 open?
Y N
3 2 2 2
ABC D E F
Copyright IBM Corp 1980
E F
MAP 8030-1
006
- Power off.
- Disconnect the plug at J4 (MIM
451 and 457).
- Replace the fuse.
- rower on.
Does F6 open again?
Y N
007
- Defective feature PC board.
008
Problem is in
distribution to
board (MIM 455).
the -8.5 Vdc
the Logic
- Remove modem card A-D7 to
isolate the problem.
009
Power off.
Disconnect the plug at J2 (MIM
45 1 and 457).
- Replace the fuse.
- Power on.
Does F3 open again?
Y N
010
Problem is in the +24 Vdc
distribution to the diskette
drives or
display.
remote keyboard
- Remove the cables until
problem is isolated (MIM 455).
011
•
Defective base PC board (MIM
474) .
EC840874 PEC839787
MAP 8030-1