Main Unit Adjustment - Icom IC-PW1 Service Manual

4-3 MAIN UNIT ADJUSTMENT

The TUNER BASIS VOLTAGE ADJUSTMENT needs the IC-736 as an exciter.
ADJUSTMENT ADJUSTMENT CONDITION
SWR 1 • Input AC voltage
DETECTOR • Pre-set R4, R6, R15 to 90˚ coun-
terclockwise
CIRCUIT
• Pre-set R5, R22 to center.
• Pre-set S3 to 5, and S4 to 4.
• [METER-1]
• Pre-set ALC adj1 to max. coun-
terclockwise, and then turn slow-
ly ALC adj1 to max. clockwise.
• Exciter frequency
• Mode
• RF power
• Transmitting
2 • [METER-2]
• Transmitting
• After adjustment, reset ALC adj1 to max. conterclockwise.
TUNER 1 • Disconnect J5 on the tuner unit of
BASIS VOLT- IC-736, and then connect to J18
on the MAIN unit of IC-PW1.
AGE
• Connect [ANT1] connector of IC-
736 to [INPUT1] connector of IC-
PW1.
• Connect a 150 Ω dummy load to
[ANT1] connector of IC-PW1.
• Turn S5 to "SET".
• Connect CP1 to ground.
• Push and hold [ANT], [ENT] and
[TUNER] switches of IC-736,
then turn IC-736 ON.
2 • Push [TUNER] key of IC-736.
After adjustment, remove the jumper wire from CP1 and reset S5 to counter side.
• SWR detector circuit adjustment
ALC adj1
SWR detector circuit
pre-setting
MEASUREMENT
UNIT
: 200 V Controller
: [P ] scale
O
: 54.0 MHz
: RTTY
: minimum
: [SWR] scale
IC-736
ANT4 ANT3 ANT2
ACC-2 ALC2 SEND2 ACC-1
CONTROLLER
REMOTE ALC adj2
4 - 4
LOCATION
[METER-1] 400 W
[METER-2] Minimum value
DISPLAY Display
shows "SET".
Display
shows "END".
Rear panel
ANT1
ALC1 SEND1
EXCITER
1 1&2
REMOTE ALC adj1
L
N
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
Exciter
FILTER
of IC-736
of IC-736
INPUT1
INPUT2
RF
power
volume
C73
Verify