IBM 5280 Manual page 116

F
3
DATA ENTRY MAP
A-El KEYBOARD
PAGE
4 OF 6
012
- Probe A-EI-TP14,
'+
Strobe
A-El-TP4, '+
B', (MIM 201,
Keyboard A', or
Strobe Keyboard
203
t
227).
Up light: Pulses with a
key pressed.
Down light: On
Are the lights correct?
Y N
013
Power off.
Remove the Data Station cable
from the cable connector
panel position labeled 1 or
1/2
(Jl03) (MIM 227).
Set the C.E. Meter to the
RXl scale.
Measure the resistance from
the cable connector panel
JI03-10,
A',
or pin
Keyboard
<t-lIM 227).
, + Strobe Keyboard
14, + Strobe
B', to frame ground
The meter should read in the
range of 50 to 100 Ohms.
Is the meter reading between 50
to 100 ohms?
Y N
014
H J
Use HIM 227 to trace the
'+
Strobe Keyboard A or B'
line for opens or grounds.
- - - - OR
Defective Data Station
Adapter Card (A-El) (MIN
501) •
H J MAP 1021-4
015
016
GO TO THE 5281 OR 5282 DATA
STATION DATA ENTRY MAP 1000,
ENTRY POINT A.
If the failure is not
isolated by the Data Station
MAP's, replace the Data
Station Adapter Card (A-El)
(MIN 501).
Probe A-El-TP13,
'+
Break Code
Keyboard A', or A-EI-TP5, '+
Break Code Keyboard B', (MIM
201, 203, 227).
Up light: On
Down light: On
Are the lights correct?
Y N
I
017
Power off.
Remove the Data Station cable
from the cable connector
panel position labeled
1
or
1/2
(JI03) <MIM 227).
- Set the C.E.
Meter to the
RXI scale.
- Measure the resistance from
the cable connector panel
J103-ll, + Break Code
Keyboard A', or pin 1, '+
Break Code Keyboard B', to
f~ame
ground (MIM 227).
The meter should read in the
range of 50 to 100 Ohms.
Is the meter reading between 50
to 100 ohms?
Y N
555
K L M
ECS40874
PEC839787
MAP 1021-4