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4.2.2 Adjustment of Idling Current
[ Required instruments ]
(1 )DC ammeter (1 0 A)
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Adjustment procedures
>
(1) Check
+
and
-
terminal of PA with a tester.
(2) Arrange a DC ammeter between the power supply unit and PA unit as shown in
Fig.l3.(Set the range of ammeter to 10 A.)
(3) Turn all the volume switches, RVI 1 to RV14 and RV21 to RV24 of CCB-367 PA
control bias, anticlockwise until they stop.
(4) Turn on PA and apply an 80 V voltage. Confirm that the current is 0 A.
(5) Turn the transceiver to transmit state without supplying power.(e.g. transmission in
the SSB mode with microphone gain 0)Confirm that the current is
0
A.
(6) Turn RV11 clockwise to adjust the DC ammeter to 0.8 A.
(7) Turn RV12 clockwise to adjust the DC ammeter to 1.6 A.
(8) Turn RV13 clockwise to adjust the DC ammeter to 2.4 A.
(9)
Turn RV14 clockwise to adjust the DC ammeter to 3.2 A.
(1 0)Turn RV21 clockwise to adjust the DC ammeter to 4.0 A.
(1 1)Turn RV22 clockwise to adjust the DC ammeter to 4.8 A.
(12)Turn RV23 clockwise to adjust the DC ammeter to
5.6 A.
(1 3)Turn RV24 clockwise to adjust the DC ammeter to 6.4 A.
(The adjusting order does not have to be consecutive from (6) to (1 3) as above. Adjust
to flow a current of 0.8 A for a volume switch. The volume switch points in the direction
of about one o'clock. If it does not point in that direction, a failure may exist.)
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