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Troubleshooting
TAS 455 and TAS 465 Service Manual
6Ć43
TableĂ6Ć5:ăSymptom Matrix (Cont.)
Symptom Display
Control
Front
Panel
Display
Driver
AnalogProcessor
Trigger level, vertical position, and horizontal
position
The trace position controls nor the TrigĆ
ger Level control works
f f F
Some of these controls work but not all f F f
Probe Scale (X10) Problems
Volts/Div readout does not change with a
X10 probe on any channel
F
Front Panel Control Problems
Front panel controls do not work but
readout display works
f F
Front panel controls do not work and the
readout display is abnormal
F f
CRT Bezel buttons do not work but other
buttons and knobs work
F
Front panel LED Problems
No LED's momentarily light at powerĆon
but readout is okay
f F
No LED's momentarily light at powerĆon
and abnormal readout
F f
Some LED's momentarily light at powerĆ
on, but not all do
F
No trigger on line source f F f