Tektronix TAS 475 - Page 143

Troubleshooting
•
Table 6-5:
Symptom Matrix (Cont.)
Symptom
Processor Analog Display Front
Display
Driver Panel
Control
Trigger level, vertical position, and horizontal
position
The trace position
controls nor the Trig-
O 0
•
ger Level control works
Some of these controls work but not all
0
•
0
Probe Scale (X10) Problems
Volts/Div
readout does not change with a
•
X10 probe on any channel
Front Panel Control Problems
Front panel controls do not work but
0
•
readout display works
Front
panel controls do not work and the
•
0
readout display is abnormal
CRT Bezel buttons do not work but other
•
buttons and knobs work
•
Front panel LED Problems
No LED's momentarily light at power-on
0
•
but readout is okay
No LED's
momentarily light at power-on
•
0
and abnormal readout
Some LED's momentarily light at power-
•
on, but not all do
No trigger on
line source
0
•
0
•
TAS 475 and TAS 485 Service Manual 6-41
Scan by Zenith