Icom IC-706MKIIG Service Manual page 18

TRANSMITTER ADJUSTMENTS (continued)
ADJUSTMENT ADJUSTMENT CONDITION
FM VCO 1 • Display frequency: 29.10000 MHz
• Mode
• [Q1 RF POWER] : H
• [M4 TON]
• Apply no signal to [MIC] connector.
• Transmitting
FM 1 • Display frequency: 29.10000 MHz
DEVIATION • Mode
• [Q1 RF POWER] : H
• [M4 TON]
• [Q2 MIC GAIN]
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
RESIDUAL 1 • Display frequency: 29.10000 MHz
• Mode
AM
• [Q1 RF POWER] : H
• [M4 TON]
• [Q2 MIC GAIN]
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV and OFF
• Transmitting
2 After adjustment, varify the TRANSMIT TOTAL GAIN and OUTPUT POWER adjustments.
1 • Display frequency: 14.10000 MHz
AM
MODULATION • Mode
• [Q1 RF POWER] : H
• [Q2 MIC GAIN]
• Disconnect the plug from J281 on
the MAIN board.
• Apply no signal to [MIC] connector.
• Transmitting
2 • Connect the plug to J281 on the
MAIN board.
• Apply no signal to [MIC] connector.
• Transmitting
3 • Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
CW 1 • Display frequency: 14.10000 MHz
CARRIER • Mode
LEVEL • [Q1 RF POWER] : H
• [Q5 KEY SPEED] : 60
• [M4 BRK]
• CW paddle
• Connect an RF power meter to
[ANT1] connector.
• Transmit dots for a while using a
paddle.
MEASUREMENT
UNIT
MAIN
: FM
: OFF
Rear
: FM Panel
: OFF
: 5
: FM
: OFF
: 5
MAIN
: AM
: 5
Rear
Panel
: CW
: BK
(semi break-in)
: n
4 - 4
LOCATION
Connect a digital 1.8 V
multimeter to check
point CP1011.
Connect an FM devi- ±4.5 kHz
ation meter to [ANT1]
connector via an
attenuator.
Connect an RF Minimum power differ-
power meter to ence with modulation
[ANT1] connector. and unmodulation.
Connect an osillo- 100 mVp-p
scope to check point
CP1041.
Connect an RF 35 W
power meter to
[ANT1] connector.
Connect a modula- 90 % modulation
tion analyzer to
[ANT1] connector via
an attenuator.
Connect an osillo- At the point where the
scope to check point CW carrier completely
CP921 and [ANT1] comes up in a 10
connector. msec.
CP921 voltage comes
up.
Keying (CP921)
ADJUSTMENT
POINT
VALUE
UNIT
MAIN
MAIN
MAIN
MAIN
MAIN
delay after
10 msec.
ADJUST
C1022
R1002
adjust in
sequence
L511, L512,
then adjust
L562, L563,
L566.
R1042
R1080
R999
R921