IBM 5280 Manual page 261

A
1
COMMUNICATIONS MAP
3SLS MANUAL ANSWER
PAGE 5 OF
6
023
- Power off and retry the call.
Is the busy tone still present?
Y N
024
Power on.
- Measure A-DSB03
Relay' •
'Transfer
Is the signal approximately -2.7
Vdc?
Y N
025
- Defective World Trade line
plate.
026
027
Defective 38LS line adapter
card (A-D7)(MIM S12).
Is the data station connected to
the telephone line with a jack?
Y N
6 6
H J
MAP 301S-5
A-DSB03 'Transfe~ Relay' signal
levels:
On: -2.7 Vdc
Off: -4.5 Vdc
The 'Transfer Relay' should be off
when the machine is not in data
mode.
ECS40874
PEC8397S7
MAP 3018-5