Transmitter Adjustments - Icom IC-M700PRO Servise Manual

4-3 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).
(For final
2 • Display frequency
transistors)
• mode
• Apply no audio signal to the
[MICROPHONE] connector.
• Transmitting
After adjustment, re-solder R4026.
IC APC
1
• Display frequency
• Mode
• Preset R4031 on the PA unit to
the maximum counterclockwise
position.
• Connect a dummy load (10 A)
between lead of R4035 (power
line) and EP4009 (power ground)
on the PA unit.
• 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 dummy load.
SWR
• Display frequency
1
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.
TRANSMIT
1 • Display frequency
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.
MEASUREMENT
UNIT
: 12.2300 MHz PA Cut the lead wire
: J3E (W4011) and connect
a DC ammeter (1 A)
to the cut points.
: 12.2300 MHz PA 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 w e e n t h e D C
power supply and
DC power receptacle
(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 C o n n e c t
voltmeter 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 30 A
140 W
a D C Minimum level
Maximum output power
ADJUSTMENT
POINT
UNIT ADJUST
PA R4022
PA R4025
PA R4031
Audio Output
generator level
FILTER C4392
MAIN Adjust in
sequence
L89, L88,
L65, L64,
L59