IBM 5280 Manual page 254

F
3
COMMUNICATION MAP
016
- Measure
Detection
MANUAL CALL
PAGE 4 OF
A-D8BIO
l' and
'Current Detection 2'.
Is one of these
approximately -3 Vdc?
Y N
017
GO TO PAGE 2, STEP 006,
ENTRY POINT C.
018
Measure
Relay' •
A-D8B03
5
'Current
A-D8B13
signals
'Transfer
Is the signal approximately -2.7
Vdc?
Y N
019
Defective 3SLS Line Adapter
card (A-D7)(MIM 812).
020
Defective
plate.
World
Remove the jumper
'- Data Terminal
A-D7D08 'GND'.
Trade
1 i
ne
from A-D7B02
Ready' to
MAP 3017-4
A-DSBIO 'Current Detection l ' and
A-DSBI3 'Current Detection 2'
signal levels:
On: -3 Vdc
Off:
+1
Vdc
A-D8B03 'Transfer Relay' signal
levels:
On: -2.7 Vdc
Off: -4.5 Vdc
The 'Transfer Relay' should be on
when the machine;s in data mode
and the telephone lifted.
EC840874
PECS397S7
MAP 3017-4