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Troubleshooting
Maintenance
6Ć42
The Symptom Matrix (Table 6Ć5) is an aid in determining which modules to
troubleshoot. There is no separate troubleshooting procedure for the power
supply, since each module troubleshooting procedure includes checks of
the power supply. The CRT is checked in the display control and display
driver troubleshooting procedures.
The F indicates the troubleshooting procedure most likely to locate the
failed module. The f indicates additional troubleshooting procedures that
may help located the failed module.
TableĂ6Ć5:ăSymptom Matrix
Symptom
Processor Analog Display
Driver
Front
Panel
Display
Control
Display Problems
No display at all f f f f F
Traces or readout, but not both f F f f
Abnormal readout F f
Abnormal traces f F
Abnormal traces and readout f f F
PowerĆon diagnostics indicates a failure F F f
SelfĆcalibration does not pass f F
Volts/Div and Sec/Div controls
One control works but not both f F f
Neither control works f f F
No control of Volts/Div or vertical position of a
single channel
f F
No control of Volts/Div or vertical position of
any channels
f f F
Intensity Control Problems
No control of readout and trace intensity f f F
Control of readout or trace intensity but
not both
F f
Focus Problems
No control of focus f F
Unable to focus properly F f
No control of trace rotation F
No control of scale illumination F
Symptom Matrix