Maintenance
1710J-Series Waveform Monitors
8–25
Table 8–7: High Volts Supply Fault Symptoms
Symptom
Procedure
Unable to focus CRT using the front–panel
control
Focus Amplifier Check
Unable to adjust CRT intensity using the
front–panel control
Z–Axis Amplifier Check, Grid Drive Check
No CRT display
High Voltage Oscillator Check, CRT Voltage
Check
Before proceeding with the remainder of these procedures load the low volts
supply with the instrument or with the 20
W
2 W resistor from W1 to TP1.
This is the procedure to use if you cannot adjust CRT focus with the front panel
focus control.
1. Unsolder and lift one end of R24.
2. Power up the power supply.
3. Using the digital multimeter, measure the voltage between TP1 and the
collector of Q1. It should be approximately –140 V.
4. Power down the power supply.
5. Reconnect the lifted end of R24.
This is one of the two procedures to use if you cannot adjust CRT intensity with
the front panel intensity control.
1. Unsolder and lift one end of R8.
2. Power up the power supply.
3. Using the digital multimeter, measure the voltage between TP1 and the
collector of Q4. It should be approxi10 V.
4. Short together the base and emitter of Q5. The collector of Q4 should be
approxi100 V.
5. Power down the power supply.
6. Reconnect the lifted end of R8.
This is the other procedure to use if the front panel intensity control is not
working correctly.
Focus Amplifier Check
Z–Axis Amplifier Check
Grid Drive Check
Содержание 1710J Series
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