Transmitter Adjustments - Icom IC-M710 Service Manual

4-4 TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
IDLING 1 • Display frequency
CURRENT
• Mode
(For drive • Apply no audio signal to the
transistors) [MICROPHONE] connector.
• Transmitting
After adjustment, re-solder the lead wire (W4011) on the PA150W board.
(For final • Display frequency
2
transistors) • Mode
• Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
After adjustment, re-solder R4026 on the PA150W board.
• Display frequency
IC APC
1
• Mode
• Preset R4031 on the PA150W
board to the maximum counter-
clockwise position.
• Connect an electronic load with
10 A load current (example:
KIKUSUI PLZ72W) between lead
of R4035 (power line) and EP4009
(ground) on the PA150W board.
• Connect an audio generator to the
[MICROPHONE] connector and set
as:
Frequency
Level
• Connect an RF power meter to the
[ANT] connector.
• Transmitting
After adjustment, remove the electronic load on the PA150W board..
1
SWR • Display frequency
DETECTOR
• Mode
• Ground the lead of R545 on the
MAIN unit with a wire.
• Connect an audio generator to the
2
[MICROPHONE] connector and set
as:
Frequency
• Transmitting
After adjustment, remove the wire from R545 on the MAIN unit.
1 • Display frequency
TRANSMIT
PEAK • Mode
• Ground the lead of R545 on the
MAIN unit with a wire.
• Connect an audio generator to the
[MICROPHONE] connector and set
as:
Frequency
Level
• Transmitting
After adjustment, remove the wire from R545 on the MAIN unit.
MEASUREMENT
UNIT
: 12.2300 MHz PA150W Cut the lead wire
: J3E (W4011) and connect
a DC ammeter (1 A)
to the cut points.
: 12.2300 MHz
PA150W U n s o l d e r R 4 0 2 6
: J3E and connect the DC
ammeter (3 A) to the
unsoldered points.
: 22.0000 MHz
Rear C o n n e c t
: J3E
Panel a m m e t e r ( 5 0 A )
b e t we e n t h e D C
power supply and
DC power recep-
tacle (DC input +).
: 1.5 kHz
: 100 mV rms
: 22.0000 MHz Rear C o n n e c t a n R F
: J3E Panel power meter to the
[ANT] connector.
MAIN Connect a DC volt-
meter to R150.
: 1.5 kHz
: 12.2300 MHz Rear C o n n e c t a n R F
: J3E Panel power meter to the
[ANT] connector.
: 1.5 kHz
: 3 mV
4 - 4
VALUE
LOCATION
100 mA
500 mA
a D C 30A
140 W
Minimum level
Maximum output power
ADJUSTMENT
POINT
UNIT ADJUST
PA150W R4022
PA150W R4025
PA150W R4031
Audio
Output
generator
level
FILTER C4392
MAIN Adjust in
sequence
L89, L88,
L65, L64,
L59