Icom IC-703 Service Manual page 23

TRANSMITTER ADJUSTMENTS (continued)
ADJUSTMENT ADJUSTMENT CONDITION
FM 1 • Display frequency: 29.10000 MHz
DEVIATION • Mode
• [RF POWER]
• [TON]
• [MIC GAIN]
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
AM 1 • Display frequency: 14.10000 MHz
• Mode
MODULATION
• [RF POWER]
• [MIC GAIN]
• Disconnect the plug from J2 on the
MAIN unit.
• Apply no signal to [MIC] connector.
• Transmitting
2 • Connect the plug to J2 on the MAIN
unit.
• Apply no signal to [MIC] connector.
• Transmitting
3 • Pre-set R2618 to 9 o'clock position.
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
CW 1 • Display frequency: 14.10000 MHz
• Mode
CARRIER
LEVEL • [RF POWER]
• [KEY SPEED]
• [BRK]
• CW paddle
• Connect an RF power meter to
[ANT] connector.
• Transmit dots for a while using a
paddle.
MEASUREMENT
UNIT
Rear
: FM Panel
: H
: OFF
: 5
MAIN
: AM
: H
: 5
Rear
Panel
: CW
: H
: 60
: BK
(semi break-in)
: n
4 - 6
LOCATION
Connect an FM devi- ±4.5 kHz
ation meter to [ANT]
connector via an
attenuator.
Connect an osillo- 400 mVp-p
scope to check point
CP1302.
Connect an RF 3.5 W
power meter to [ANT]
connector.
Connect a modula- 90 % (–peak) modula-
tion analyzer to [ANT] tion
connector via an
attenuator.
Connect an osillo- At the point where the
scope to check point CW carrier completely
CP1851 and [ANT] comes up in a 10
connector. msec.
CP1851 voltage comes
up.
Keying (CP1851)
ADJUSTMENT
POINT
VALUE
UNIT
MAIN
MAIN
MAIN
delay after
10 msec.
ADJUST
R2621
R1811
R2707
R2618
R1853