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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-49
Horizontal Sync Output Check. Verify the Horizontal Sync Output as follows:
1. Set the test oscilloscope as follows:
Vertical Mode CH1 & CH2
CH1 Volts/div 500 mV
CH1 Coupling DC
CH2 Volts/div 5V
CH2 Coupling DC
Time/div 10 s
Trigger Source CH2
Trigger Mode Auto
Trigger Coupling DC
2. Connect test oscilloscope channel 2 probe to pin 24 of demod/300Hz
extender board.
NOTE. Channel 1 oscilloscope probe is still connected to Video Demodulator
boards video test point.
3. Check that during one cycle of videos waveform (test oscilloscope CH 1),
the following occurs:
a. Horizontal output waveform (test oscilloscopes CH 2) changes to high state
(+5 V) when video’s 1st horizontal sync pulse begins. Refer to Figure 5--19.
b. After a period of 40 sto57s the horizontal output waveform changes
toalowstate(0V).
c. At end of videos cycle (beginning of 2nd horizontal sync pulse), the
waveform changes back to a high state.
CH 1
500 mV/DIV
(VIDEO)
CH 2
5 V/DIV
(Horizontal SYNC)
10 US/DIV
Figure 5- 19: Horizontal Sync Output