IBM 5100 - Page 107

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KEYBOARD MAP
PAGE 3 OF
8
010
-Disconnect the keyboard cable at Z4.
-Probe F2-S05 (-keyboard lockout).
Is the DOWN light on?
Y N
011
Defective keyboard PC board (refer to 251).
Check / replace keyboard cable
(refer
to 255).
012
-Connect the keyboard cable at Z4.
Defective
F2 (base I/O) card.
013
-Probe F2-U 12 (-keyboard strobe).
Is the DOWN light on?
Y N
014
-Press and hold the P key.
-Probe F2-U 12 (-keyboard strobe).
Is the DOWN light on?
Y N
015
Defective keyboard PC board (refer to 251).
Check / replace keyboard cable
(refer
to 255).
016
-Release the P key.
-Probe F2-U06 (-interrupt req
3).
Is the DOWN light on?
Y N
433
H J K
J K
3 3
MAP 0600-3
017
-Probe F2-U06 (-interrupt req 3).
-Observe the DOWN light while sequentially
pressing keys.
Does the DOWN light come on?
Y N
018
Defective F2 (base I/O) card.
019
Bit 3 is the command bit, if it is on it may be
causing the problem.
-Probe F2-P05 (-keyboard data bus
3) while
pressing the P key.
Is the DOWN light on?
Y N
020
Defective G2 (controller) card.
Defective
F2 (base I/O) card.
021
Defective CMD key module
(refer
to 252).
Defective keyboard
PC board (refer to 251).
Check / replace keyboard cable
(refer
to 255).
022
-Disconnect the keyboard cable at Z4.
-Probe F2-U06 (-interrupt req 3).
Is the DOWN light on?
Y N
4
L
023
Defective keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer
to 255).
07JUL75 PN 1608391
EC 828851 PEC -------
MAP 0600-3
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