Maintenance
1710J-Series Waveform Monitors
8–23
less than 20 k
W
indicates a shorted MOSFET (Q9). If the MOSFET is
shorted, replace it and perform the Control Circuit Check.
4. Using the DMM diode test function, test CR21, CR22, CR23, and CR24 for
shorts. Diode replacements must be fast reverse recovery (300 ns) types to
reduce conducted noise.
5. Reconnect the lifted end of R102.
This procedure uses the variable power supply to check output voltages.
1. Connect the negative output from the 20 VDC power supply to TP1.
Connect the positive output to W4 (+15 V). The circuit should draw less
than 20 mA. Excessive current draw can be caused by CR11 or U2 (High
Volts power supply).
2. Connect the negative output from the 20 VDC power supply to TP1.
Connect the positive output to W2 (+40 V). The circuit should draw less
than 20 mA. Excessive current draw can be caused by CR14 or Q6 (high
volts power supply).
3. Connect the positive output from the 20 VDC Power Supply to TP1.
Connect the negative output to W3 (–15 V). The circuit should draw less
than 20 mA. Excessive current draw can be caused by CR12.
4. Connect the negative output from the 5 VDC power supply to TP1. Connect
the positive output to W1 (+5 V). The circuit should draw less than 20 mA.
Excessive current draw can be caused by CR13 or Q1 and Q2 (high volts
power supply).
This procedure uses the variable power supply and an oscilloscope to determine
if the control circuit is functioning properly.
1. Connect the negative output from the 20 VDC Power Supply to TP2.
Connect the positive output to the cathode of CR17. Short C47 with a clip
lead. Connect the oscilloscope probe ground to TP2.
2. Table 8–6 lists the signal present in a properly functioning control circuit.
Table 8–6: Control Circuit Test Points
Circuit Location
Signal
U5, pin 1
Approximately 5 VDC
U5, pin 2
Approximately 2 VDC
U5, pin 3
0 V
U5, pin 4
80 kHz triangle wave, 2 V p–p
Output Check
Control Circuit Check
Содержание 1710J Series
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Страница 18: ...Service Safety Summary xiv 1710J Series Waveform Monitors ...
Страница 22: ...Preface xviii 1710J Series Waveform Monitors ...
Страница 23: ...Getting Started ...
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Страница 45: ...Operating Basics ...
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Страница 65: ...Specifications ...
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Страница 77: ...Theory of Operation ...
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Страница 101: ...Performance Verification ...
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Страница 121: ...Adjustment Procedure ...
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Страница 139: ...Maintenance ...
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Страница 168: ...Maintenance 8 28 1710J Series Waveform Monitors Figure 8 11 Repackaging a 1710J Series Waveform Monitor ...
Страница 169: ...Replaceable Electrical Parts ...
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Страница 239: ...Replaceable Mechanical Parts 1710J Series Waveform Monitors 11 11 1 2 3 4 5 6 Figure 11 4 Accessories ...
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