Maintenance
8–24
1710J-Series Waveform Monitors
Table 8–6: Control Circuit Test Points (Cont.)
Circuit Location
Signal
U5, pin 6
80 kHz square wave, 18 V p–p
U3, pin 1
80 kHz square wave, 5 V p–p
U3, pin 2
2.1 VDC
U3, pin 6
2.9 VDC
U3, pin 7
Approximately 5 VDC
U4, pin 13
80 kHz repetition rate, 300 ns width, approximately 3 V p–p
Q8, collector
80 kHz repetition rate, 400 ns width, switching from 5 V to approximately
2
V
3. Remove the clip lead from across C47.
This procedure is used to determine if the +5 V supply is regulating.
1. Connect the negative output from the variable DC power supply to TP1.
Connect the positive output to W1 (+5 V).
2. Connect the negative output of another variable DC power supply to TP1.
Connect the positive output to W4 (+15 V). Set the variable power supply to
20 VDC.
3. Connect the DMM between TP1 and the cathode of CR15.
4. Set the variable DC power supply connected to W1 (+5 V) to 4.8 V. The
cathode of CR15 should be approximately 20 V.
5. Set the variable DC power supply connected to W1 (+5 V) to 5.2 V. The
cathode of CR15 should be approximately 2 V.
6. If this check does not reveal the cause for the +5 V supply not regulating,
refer to the Output Check and the Control Circuit Check.
High Voltage Power Supply
The design of the 1710J–Series Waveform Monitor requires special test methods
to locate high voltage power supply faults.
These procedures start by accessing the more obvious symptoms and then
performing one or more the high voltage supply check procedures.
Table 8–7 lists the high volts supply fault symptoms and procedures.
Error Amplifier Check
Preliminary Checks
Содержание 1710J Series
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