Icom IC-7600 Service Manual

4 - 6
4-4 PA UNIT ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION OPERATION
ADJUSTMENT
POINT
VALUE
IDLING
(Preparation)
"IDLING" must be adjusted by cold-started.
1
–
1) Set 5 variable resisters to the preset
point.
2) Disconnect the power cable from
the transceiver, and connect an DC
Ammeter (30 A) between the power
supply and transceiver.
R4,
R14,
R16,
R65,
R67
Max.
counter
clockwise
IDLING
(PRE-
DRIVER)
2 • Frequency : 14.100 MHz
• Mode : CW
• Push [TRANSMIT] to transmit.
1) Connect a Digital multimeter to CP1
and adjust the voltage.
2) Measure the current, and note it as
the initial value.
R4
0.5 V
(0.4–0.6 V)
IDLING
(DRIVER)
3 • Frequency : 14.100 MHz
• Mode : CW
• Push [TRANSMIT] to transmit.
• Adjust the current.
R14
+1.0 A
more than
"Step 2"
4• Adjust the current.
R16
+1.0 A
more than
"Step 3"
IDLING
(FINAL AMP)
5 • Frequency : 14.100 MHz
• Mode : CW
• Push [TRANSMIT] to transmit.
• Adjust the current.
R65
+1.0 A
more than
"Step 4"
6• Adjust the current.
R67
+1.0 A
more than
"Step 5"
7 Apply slight vibration to the PA UNIT, and verify that the current is stable against the vibration.
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Icom IC-7600 Specifications

General

Brand	Icom
Model	IC-7600
Category	Transceiver
Language	English