4.2.2 Adjustment of ldling Current
[ Required instruments ]
(1)DC ammeter (10
A)
< 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.13.(Set the range
of
ammeter to 10
A.)
(3)
Turn all the volume switches,
RV11
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. Gonfirmthat 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 O)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 RV14clockwise to adjust the DC ammeter to 3.2
A.
(1
O)Turn
RV21
clockwise to adjust the DC ammeter to 4.0
A.
(11
)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.
(13)Turn RV24 clockwise to adjust the DC ammeter to 6.4
A.
(The adjusting order does not have to be consecutive from
(6)
to
(13)
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. lf it does not point in that direction, a failure may exist.)
[!!]
POWER
AIIP
;---1
~ITJ
CAH-377
Power
Supply +
OCOUlPUT
~
Unit
t -
-
NBL-169
00
POWER
AMP
....__
H
'----{
ITJ
CAH-377
Fig.13.
27
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