IBM 5100 - Page 89

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B B
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PROCESS CHECK MAP
PAGE 15 OF 17
171
-Press and hold the Z key.
-Probe the keyboard data bus
5 F2-Jll 6 F2-M12
2 F2-M08 4 F2-P02
7
F2-M09 3 F2-P05
P
F2-Ml0 1 F2-U02.
o F2-Mll
Are bits 0 and 3 UP and all the rest
DOWN?
Y N
172
Defective keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer
to 255).
173
Defective F2 (base I/O) card.
174
-Press and hold the 9 key on the alphameric
keyboard.
-Probe the keyboard data bus
5 F2-Jll 6 F2-M12
2 F2-M08 4 F2-P02
7
F2-M09 3 F2-P05
P
F2-Ml0 1 F2-U02.
o F2-Mll
Are all bits 0-7 UP and the P bit DOWN?
Y N
175
Any bit 0-7 DOWN?
Y N
B B
176
Defective keyboard PC board (refer to 251).
Check/replace keyboard cable
(refer
to 255).
B B B B
A C R S
1 1
MAP 0420-15
2 2
177
-Remove the Z4 (keyboard) cable.
-Probe the keyboard data bus again
5 F2-Jll 6 F2-M12 '
2
F2-M08 4 F2-P02
7
F2-M09 3 F2-P05
P
F2-Ml0 1 F2-U02.
o F2-Mll
Are any bits DOWN?
Y N
178
Defective keyboard PC board (refer to
251).
Check / replace keyboard cable
(refer
to 255).
179
-Connect the Z4 (keyboard) cable.
Defective
F2 (base I/O) card.
180
Defective F2 (base I/O) card.
Defective G2 (controller) card.
181
-Switch the RUN switch under the covers to
run.
Does R3LO contain AAAA?
Y N
182
Go to Page 12. Step 140. Entry Point G.
183
Defective G2 (controller) card.
Defective H2
(I/O and diag) card.
184
-Switch the RUN switch under the covers to run.
Defective G2 (controller) card.
Defective H2
(I/O and diag) card.
28SEP76
PN 1608388
EC 829670 PEC 829523
R S MAP 0420-15