Theory of Operation
1735 HD High Definition Waveform Monitor
4–19
R8 converts the external reference voltage to current which drives Q5 and Q1.
When external reference is selected, Q1 turns off and Q5 turns on. The external
reference current from the collector of Q5 is added to the reference summing
junction at the emitter of Q4. Q3 improves the off isolation of the external
reference switch.
Sync Stripper.
U2 is the sync stripper. It is a fixed gain, fixed threshold sync
stripper with a sync-tip clamp. R17 is the feedback resistor for the amplifier, and
R16 is the input resistor. C9 is a speed-up cap for the detector that follows the
amplifier. R22 and C5 are power supply decoupling components.
Remote Sync.
The Remote Sync and RGB Staircase share a common emitter
follower input stage, Q8. U3D is an inverter that is used with negative-going
sync signals. Sync inversion is selected by placing a plug jumper on pins 2 and 3
of J5. U3C generates the clock for U13B by ANDing remote sync with the
microprocessor-generated REM SYNC EN. U13B is a JK flip-flop that is preset
and cleared by the slave microprocessor (Diagram 11).
Summary of Contents for 070-8462-03
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Page 13: ...Table of Contents viii 1735 HD High Definition Waveform Monitor...
Page 19: ...Preface xiv 1735 HD High Definition Waveform Monitor...
Page 20: ...Getting Started...
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Page 35: ...Installation 1 14 1735 HD High Definition Waveform Monitor...
Page 36: ...Operating Basics...
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Page 64: ...Specifications...
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Page 179: ...Corrective Maintenance 7 20 1735 HD High Definition Waveform Monitor...
Page 181: ...Repackaging 7 22 1735 HD High Definition Waveform Monitor Figure 7 10 Repackaging...
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