1730–Series Maintenance
6–11
than 20 mA. Excessive current draw can be caused by CR11 or U2
(High Volts power supply).
b. Connect the negative output from the 20 V DC 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).
c.
Connect the positive output from the 20 V DC 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.
d. Connect the negative output from the 5 V DC 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).
4. Control Circuit Check
a. Connect the negative output from the 20 V DC 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.
b. Table 6–4 lists the signal present in a properly functioning control
circuit.
Table 6–4: 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
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
Содержание 1730 Series
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Страница 12: ...Contents viii...
Страница 17: ...Introduction and Specifications...
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Страница 32: ...1730 Series Introduction 1 14...
Страница 33: ...Operating Instructions...
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Страница 62: ...1730 Series Operating Instructions 2 28...
Страница 64: ...Service Safety Summary S 2 1730 Series B070000 Above...
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Страница 67: ...Installation...
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Страница 82: ...1730 Series Installation 3 14...
Страница 83: ...Theory of Operation...
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Страница 115: ...Checks and Adjustments...
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Страница 159: ...Maintenance...
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Страница 180: ...1730 Series Maintenance 6 20 3 Remove the board by slipping it through the front panel opening...
Страница 184: ...1730 Series Maintenance 6 24 Figure 6 8 Repackaging a 1730 Series instrument...
Страница 185: ...Options...
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Страница 189: ...Replaceable Electrical Parts...
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Страница 222: ...1730 Series Replaceable Electrical Parts 8 32...
Страница 223: ...Diagrams Circuit Board Illustrations...
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Страница 247: ...Replaceable Mechanical Parts...
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Страница 255: ...1730 Series Waveform Monitor FIG 1 EXPLODED VIEW A1 A3 A2 A3A1 A10 A11...
Страница 256: ...1730 Series B070000 Up...
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