Omron 8025G Maintenance Manual page 165

MAINTENANCE AND REPAIR
SECTION 6
RS-232 Interface. Plug the card onto the extender card and insert in the
terminal. Connect the ribbon cables. Check for the following waveforms in the
order given:
WAVEFORM 51: Each A Data Bus line
Oscilloscope Settings:
Vertical,
1
V/cm
Horizontal,
1
msec/cm
Synch ronization, internal
IF SIGNAL IS INCORRECT OR ABSENT,
mECK:
XEl-3, 6,
8, 11;
XGl-3,
6, 11;
related input circuitry to XEl
and XG1; Timing Control Card
WAVEFORM 52: POLL
om
Oscilloscope Settings:
Vertical,
1
V/cm
Horizontal, SO msec/cm
Synchronization, internal
IF SIGNAL IS INCORRECT OR- ABSENT,
CHECK:
XG6-3 and related input circuit-
ry, Timing Control Card
WAVEFORM 53: Reset Command
(MAl,2,3,4)
Oscilloscope Settings:
Vertical, lV/em
Horizontal,
2
msec/cm
Synchronization, internal
IF SIGNAL IS INCORRECT OR ABSENT,
CHECK:
Processor Card
6-42