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KEYBOARD I1AP 0700
PAGE
1 OF
ENTRY POINTS
FROM
ENTER THIS MAP
MAP
ENTRY
PAGE
STEP
NUMBER
POINT
HUMBER
NU~lBER
0000
A
1
001
0100
A
1
001
0100
BB
1
002
0100
CC
1
006
0100
EE
2
019
0800
A
1
001
0900
A
1
001
1000
EE
2
019
001
(ENTRY POINT Al
.Switch power OFF
~.
-Reconnect the keyboard if i t is
disconnected.
Keys binding, broken or worn are
mechanical failures.
Is this a mechanical failure or clicker
problem?
Y N
3
002
(ENTRY POINT BBI
• Switch power OFF
~.
-Remove the keyboard top cover.
See MIM
sect
i
on 4.11. 2.
-Disconnect and reseat the internal
keyboard connector, (See Figure 6-11.)
the keyboard cable connector and the
keyboard cable connector on the logic
gate.
(DS).
-Switch power ON
m.
.See Figure 6-11 and Figure 6-12 and
Table 7.1 (column 2) and check the
voltages at the internal keyboard> cable
connector.
Table 7.1
Voltage.
Internal
Keyboard
Tolerance.
Connector
OV meter ref
D08
+S Vdc ±O.SV
DO 3
+8.SVdc ±0.9V
Bll
-S Vdc ±O.SV
B06
Are all voltages correct?
Y N
003
logic
Gate.
DSD08
DS003
DSBll
DSB06
-Disconnect the keyboard cable
connector
from the logic gate (051.
• See Figure 6-11 and Figure 6-12.
-Check
the voltages shown in Table
7.1
(column
3)
on the logic gate.
Are all the voltages correct?
, i
Copyright IBM Corp 1981
ABC D
BCD
I1AP 0700-1
L
There is probably a failure in the
logic board strips.
-See Figure
3-1 and Figure 6-4.
GO TO MAP 0000. ENTRY POINT BB.
005
.See MIM Figure 6-11 and Figure 6-12 and
Table
7.1
to check connections
and
isolate
to a
failing cable or
connector.
GO TO MAP 0000. ENTRY POINT BB.
006
(ENTRY POINT eel
.See Figure 6-11 and veri"fy
that
the
keyboard jumpers are plugged correctly
for this tYPQ of keyboard.
Uere they correct?
Y
I
;g~t
up keyboard jumpers correctly.
GO TO MAP 0000. ENTRY POINT BB.
008
·(Check keyboard ID bits.)
.Probe
the
keyboard connector
in the back
of the logic gate (DS).
See Table 7.2
(column 2) .
.Record
if each signal is UP or DOWN.
Bits which are jumpered should be DOWN
and bits which are not jumpered should be
UP.
Table 7.2
ID
logic
Keyboard
bit
Gate
internal
connector
0
OSBOS
D04
1
DSB07
DOS
2
DSB10
D09
3
05012
010
Are the 10 bits correct?
Y N
009
-Probe the internal keyboard connector.
See Table 7.2 (column
3)
and record the
results.
Bits which are"jumpered
should be DOWN.
Bits which are not
jumpered should be UP.
Are the 1D bits correct?
Y N
2 2
010
.Switch power OFF
~.
-Exchange the
keyboard logic card.
GO TO MAP 0000. ENTRY POINT BB •
04FEB81
E F
I1AP 0700-1
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