1. Low-Voltage Power Supply Adjustments
11. With the LINE switch still ON, the RF Section’s
V indicator
(yellow LED) should be lit. See Figure 3-4.
12. Connect the DVM to
and the DVM ground lead to chassis
ground. Adjust
V ADJ for a DVM indication of
V dc.
If
ADJ does not provide sufficient adjustment range,
select a new
for factory-select component
An increase
in the
of
decreases the voltage at
Conversely, a
decrease in the value of
increases the voltage at
Refer
to
3-3 for the acceptable range of values and corresponding HP
part numbers for
and to Figure 3-4 for the location of
13. Verify that the
V indicator
(yellow LED) is lit.
14. Connect the DVM to
Adjust
V ADJ for a
DVM indication of
fO.OO1 V dc.
15. Verify that the + 12 V indicator
(yellow LED) is lit.
16. Connect the DVM to
The DVM indication should
be + 12.25
V dc. The + 12 V supply voltage is set by a
precision voltage regulator; therefore, if the + 12 V supply is out
of tolerance, a circuit malfunction is indicated.
17. Verify that the
V indicator
(yellow LED) is lit.
3-28 Adjustments
