IBM 5280 Manual page 115

C D E
222
DATA ENTRY MAP
A-El KEYBOARD
PAGE 3 OF
6
006
Use MIM 227 to trace the
'+
Serial Data Keyboard A or
B' 1
i
ne for
opens or
grounds.
- - - - - OR
007
Defective Data Station
Adapter Card (A-El) (MIM
501) .
- GO TO THE 5281 OR 5282 DATA
STATION DATA ENTRY MAP 1000 7
ENTRY POINT A.
If the failure is not
isolated by the Data Station
MAP's7 replace the Data
Station Adapter Card (A-El)
(MIM 501).
008
- Probe A-EI-TP6 '- Serial Data
Clock Keyboard A' or A-El-TP2
'- Serial
D~ta
Clock Keyboard
B' (MIM 201, 203, 227).
Up light: On
Down light: Pulses with a
key pressed.
Are the lights correct?
Y N
4
F G
G
MAP 1021-3
009
Power o·ff.
Remove the Data Station cable
from the cable connector
~anel
position labeled 1 or
1/2
(JI03) (MIM 227).
- Set the C.E. Meter to the RXI
sea 1 e.
- Measure the resistance from the
cable connector panel JI03-l2,
- Serial Data Clock Keyboard
A', or Jl03-02, '- Serial Data
Clock Keyboard
B',
to frame
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
010
- Use MIM 227 to trace the ,-
Serial Data Clock Keyboard A
or
B'
line for opens or
grounds.
- - - - - OR
- Defective
Adapter
501) .
Data Station
011
- GO TO THE
STATION
Card (A-El) (MIM
5281 OR
DATA ENTRY
5282 DATA
MAP 1000,
ENTRY POINT A.
If the failure is not isolated
by the Data Station MAP's7
replace the Data Station
Adapter Card <A-El) (MIM 501).
EC840874 PEC839787
MAP 1021-3