Tektronix 070-8462-03, Instruction Manual

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Adjustment Procedure
6–8
1735 HD High Definition Waveform Monitor
b. Adjust A4R145 (Vertical Readout Position) and A4R156 (Horizontal
Readout Position) if needed to view the MENU display. (A4R145 and
A4R156 will be adjusted more precisely in a later step.)
c. Select TEST, then DAC TEST from the MENU.
d. Set the 1735 HD front-panel FOCUS control to approximately mid
range.
e. Adjust A1R10 (Center Focus) and A1R43 (Astig) for the most clearly
defined display.
f. Adjust A1R38 (Geometry) for minimum bowing.
g. Return to the MAIN MENU, and leave the MENU displayed for the next
step.
Refer to Figure 6–1B.
7. Adjust Horizontal Sync Timing
a. Select LINES/FRAME from the MENU. Choose the NTSC (525/60/2)
or PAL (625/ 50/2) standard, depending on the type of television test
signal generator being used. Exit the MENU.
b. Select CH 1A INPUT, CH 1 REF, and TWO LINE Sweep on the
1735 HD.
c. Connect a X10 probe from Channel1 on the test oscilloscope to A4R113.
See Figure 6–1B.
d. Set the test oscilloscope as follows:
Volts/Div 2
Time/Div 10
m
s
Mag X10
Trig Slope Level –
e. Adjust A4R93 (Timing) for a 3
m
s pulse width. See Figure 6–4.
Figure 6–4: Adjusting horizontal sync timing
Control Board (A4)