IBM 5100 Maintenance Analysis Procedures page 106
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A B
1 1
002
KEYBOARD MAP
PAGE
2 OF
8
(Entry Point B)
Keyboard intermittent failures procedure.
Perform the following actions, one on each
call until the problem is
~orrected:
1 . Clean the keyboard PC board
(refer to 251).
Reseat the keyboard cable at both ends.
Date / /
2. Replace the keyboard PC board
(refer to 251).
Date / /
3. Replace the all keys assembly
(refer to 251).
Date / /
4. Replace the F2 (base I/O) card.
Date / /
5. Replace the G2 (controller) card.
Date / /
6. Replace the H2 (I/O & diag) card.
Date / /
7. Replace the power supply.
***********
*
CAUTION
*
***********
Refer to 271, power supply removal and
replacement.
Date / /
003
Is the PRO<;:ESS CHECK light on?
Y N
8 2
C 0
o
2
MAP 0600-2
004
-Calibrate the CE meter (refer to 270).
-For the probe points
(refer to 204).
-Measure +8.5 vdc and +5.0 vdc at the keyboard
PC board with reference to gnd on the A 1 board.
Are both voltages in
tole~anee (+7.8
vde to
+9.3 vde) and (+4.6 vde to +5.5 vde)?
Y N
005
-Measure +8.5 vdc and +5.0 vdc at the A 1
board.
(refer to 255).
Are both voltages in tolerance (+7.8 vde to
+9.3 vdel and (+4.6 vde to +5.5 vde)?
Y N
006
Go to MAP 0700, Entry Point A.
007
Defective keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer to 255).
008
-Press the
Q
key then the P key.
Did anything (P,
Q,
*, ?, invalid key, etc)
appear on the display?
Y N
009
-Probe F2-S05 (-keyboard lockout).
(refer to the appendix, the general logic
probe).
Is the UP light on?
Y N
07JUL75
PN 1608391
433
E F G
EC 828851
PEC -------
MAP 0600-2
c
c
o
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