Tektronix instruction manual Remove the shorting strap 1705A Spectrum Monitor, Shorting, Strap

Checks and Adjustments

b.Exit the DAC test pattern by first pressing the INPUT button to display the TEST menu.

c.Press either SPAN/DIV button to move the cursor to EXIT, then press the INPUT button twice to return to a normal display.

A3 MAIN BOARD

(Refer to Figure 5-7 for adjustment locations)

5.Adjust On-Board Regulated Power Supplies

a.Connect the voltmeter ground lead to the rear-panel LNB POWER switch ground lug, and the active lead to the -11.8 V test point (W8). See Figure 5-7.

b.ADJUST - R99 (-11.8 V ADJ) for -11.8 V (-11.78 to -11.82 V).

c.Connect the voltmeter active lead to the +11.8 V test point (W9). See Figure 5-7.

d.ADJUST - R111 (+11.8 V ADJ) for +11.8 V (+11.78 to +11.82 V).

6.Adjust Horizontal Gain

a.Connect a shorting strap between W11 and W12. See Figure 5-9.

SHORTING

W11

STRAP

W12

Figure 5-9: Location of the shorting strap used when adjusting sweep length

b.ADJUST - R168 (HORIZ GAIN) for a sweep length of 10 major Divisions. Use the -60 horizontal graticule line as the reference.

c.Remove the shorting strap.

1705A Spectrum Monitor 5- 21