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1 1
KEYBOARD I1AP
PAGE
2 OF
L
-Switch power OFF
~.
-See Figure 6-11 and
Figur~
6-12 and
Table 7.2 to check connections and
isolate to a failing cable or
connector.
GO TO MAP 0000, ENTRY POINT BB.
12
·Probe internal keyboard connector pin 007
(POR).
The UP lamp on the probe should be on.
The DOWN lamp should flash when the
TEST/NORMAL switch is operated.
Is all correct?
Y N
013
.Probe DSB09 (POR).
-Repeat the last test.
Is all correct?
Y N
01'+
-Switch power OFF
~.
• See Figure 6-12 and trace the
connections from keyboard pin 007 to
DSB09.
-Isolate to a failing cable or
connector.
GO TO MAP 0000, ENTRY POINT BB.
015
-Exchange logic card D2.
GO TO MAP 0000, ENTRY POINT BB.
16
.Probe DSDIO (DATA AVAILABLE).
-Press each keyboard key.
The signal
should pulse DOWN once as each key is
pressed.
Ignore any characters displayed
on the screen.
Did any key fail this test?
Y N
3
G
017
.Probe internal keyboard connector pin
D02 (KEYBOARD ACKNOWLEDGE).
-Press ANY keyboard key.
The signal
should pulse DOWN as the key ;s
pressed.
Ignore any characters
displayed
on the screen.
~as
a down pulse seen?
Y N
018
-Switch power OFF
~.
-See
Figure 6-11 and Figure 6-12 and
check continuity from internal
keyboard connector pin D02 to logic
gate DSDOS.
-Repair or exchange as necessary.
-If
the continuity is good, exchange
logic card C2.
GO TO MAP 0000, ENTRY POINT DB.
H
I1AP 0700-2
I
019
(ENTRY POINT EEl
·Probe DSD07 (MAKE /BREAK).
-Press the following keys - ALT , SHIFT
(right and left) and SHIFT LOCK.
(These keys are identified with the
following legends in Figure 2-3 (TEST MODE
2):
mm nn
00
pp).
The signal should pulse UP as each of
these keys is RELEASED.
Did these keys pass this test?
Y N
020
.Probe on the internal keyboard
connector pin B12 (MAKE/BREAK).
-Press the following keys - ALT, SHIFT
(right and left) and SHIFT LOCK.
(These keys are identified with the
following legends in Figure 2-3 (TEST
MODE 2), mm nn
00
pp).
The signal should pulse UP as each of
these keys is RELEASED.
Did the keys pass this test?
Y
I
;~!change
the keyboard logic card .
GO TO MAP 0000, ENTRY POINT BB.
022
-See
Figure 6-12 and trace the
connections from internal keyboard
connector pin B12 to D5D07.
-Isolate to a failing cable or
connector.
GO TO MAP 0000, ENTRY POINT BB.
023
.Probe the logic gate pins shown in Table
7.3 Column
3.
-Press the
Q
key (see Figure 2-3) each
time.
Each pin should pulse UP as the
Q
key
is pressed.
Table 7.3
Keyboard
Scan
bit
Connector
0
B05
1
D06
2
D13
Did each pin pulse up1
Y N
024
Logic
Gate
DSB08
DSD09
DSB04
-Probe the internal keyboard connector
pins shown in Table 7.3 Column 2
.PreS5 the
Q
key each time.
The signal
should pulse UP each time the
Q
key is
pressed.
Did each pin pulse up?
11
3 3
K L
04FEB81
MAP 0700-2
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