IBM 5100 - Page 117

(
(
(
L M N
333
044
POWER MAP
PAGE 5 OF
-Power down.
5
-Disconnect keyboard cable at the
keyboard
(refer
to 204).
-Power up.
Is the measured voltage out of tolerance
now?
Y N
045
Short circuit in the keyboard PC board.
(refer
to 251).
046
Defective keyboard cable
(refer
to 204).
047
Go to Page 5, Step 048, Entry Point C.
048
(Entry Point C)
-Power down.
-Remove all the cards from the board.
(refer to 209.)
-Power up. Wait 30 seconds.
Does
fuse F1 blow or does power drop or is
the voltage out of tolerance now?
Y N
049
Defective card.
Power down and power up
as you reinstall the
cards one at a time until the defective card is
found.
050
Defective A 1 board.
F
2
051
MAP 0700-5
The power supply is working properly.
Are you missing a voltage at a specific
device?
Y N
052
Defective A 1 board.
053
-Trace the circuit from that device to the power
supply
(refer
to section 5, power supply voltages).
12DEC75
PN 1608392
EC 829523 PEC 828851
MAP 0700-5