IBM 5100 - Page 88

~ 9
PROCESS CHECK MAP
3 3
PAGJi; 140F 17
157
-Preslil all keys until one gives a bus in CI18ck.
.,.Using the key codes chart find the hex v~lue
for the failing key (refer to 250.)
-Press and hold the failing key and probe the
KEYBOARD DATA BUS (note: DOWN is a
1,
UP is a 0).
S F2-Jll
2 F2-M08
7 F2-M09
P F2-Ml0
o F2-Mll
6 F2 .. M12
4 F2-P02
3 F2-P05
1 F2-U02.
Is the data on the bus correct?
Y N
158
Defectiv.e keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer
to 255).
159
Defective F2 (base I/O) card.
160
-Press and hold the shift and the Z keys.
-Probe F2-M11 (-keyboard data bit
0).
Is the DOWN light on?
Y N
161
Defective keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer to 255).
162
Defective F2 (base I/O) (fard.
B B
M N
1 1
3 3
163
-Press and hold the 6 key on the alphamElri~
keyboard.
-Probe F2-P05 (-keyboard data bit
3).
Is the DOWN light on?
Y N
164
Defective keyboard PC I:>par~ (refer tQ 21,)1).
Check/ replace keyboard cable
(refer
to 255).
165
Defective F2 (base I/O) card.
166
-Probe F2-M10 (-keyboard P bit),
-Press and hold
theW key.
Is the UP light on?
Y N
167
-Probe F2-M10
-Disconnect the
key\:>oard cable at ~4.
Is the UP light on?
Y N
168
Defective F2 (base I/Olci;lrd.
169
Defective keyboard PC boarl;l (refer to 251).
Check/ replace keyboard cable
(refer
to 255).
170
Defective F2 (Qase I/O) card.
28SEP76
PN 1 (m8SS8
EC 829670 PEe 8~9523
IVIAP 0420 .... 14
o
o