
1. Low-Voltage Power Supply Adjustments
RF
Section
11. With the LINE switch still ON, the RF Section’s
+22
V indicator
A8DSl
(yellow LED) should be lit. See Figure 3-4.
12. Connect the DVM to A8TPl and the DVM ground lead to chassis
ground. Adjust
A8R2
+22
V ADJ for a DVM indication of
+22.000
f0.020
V dc.
Note
If
A8R2
+22V
ADJ does not provide sufficient adjustment range,
select a new
value
for factory-select component
A8R6.
An increase
in the
value
of
A8R6
decreases the voltage at
A8TPl.
Conversely, a
decrease in the value of
A8R6
increases the voltage at
A8TPl.
Refer
to
‘Ihble
3-3 for the acceptable range of values and corresponding HP
part numbers for
A8R6,
and to Figure 3-4 for the location of
A8R6.
13. Verify that the
+20
V indicator
A17DS2
(yellow LED) is lit.
14. Connect the DVM to
A17TP4.
Adjust
A17R50
+20
V ADJ for a
DVM indication of +20.000 fO.OO1 V dc.
15. Verify that the + 12 V indicator
A17DS4
(yellow LED) is lit.
16. Connect the DVM to
A17TP6.
The DVM indication should
be + 12.25
LO.30
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
+5.2
V indicator
A17DSl
(yellow LED) is lit.
3-28 Adjustments
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