Icom IC-7700, Service Manual

Page: 21 / 135

4 - 9
4-5 ADJUSTMENTS ON THE MAIN UNIT (including RF UNIT)
ADJUSTMENT ADJUSTMENT CONDITION OPERATION
ADJUSTMENT
POINT
VALUE
PREPARATION
(Preset) 1 • Receiving 1) Turn the power OFF.
2) Push and hold [F-INP]+[MW] keys,
and turn the power ON (All clear).
– –
2 • Set the variable resister to the preset
point.
R2042 Max. CW
3 • Set the variable resister to the preset
point.
R2006
3 o'clock
position
3 • Connect a Digital multimeter to the
CP2001.
R2028 0.3–0.7 V
TRANSMIT
OUTPUT
POWER 1 • Frequency : 14.100 MHz
• Mode : USB
• Transmitting
1) Connect an Audio Generator to the
MIC jack (see the page 4-2) and set
it as;
Frequency : 1.5 kHz
Level : 1 mV
2) Connect an RF Power Meter to the
[ANT1].
3) Adjust the RF power.
L505
→
C576
→
L512
(RF UNIT)
(in sequence,
repeatedly)
Maximum
output
power
2 • Frequency : 14.100 MHz
• Mode : FM
• MIC gain : Maximum
• Transmitting
1) Set the SSG as;
Frequency : 1 kHz
Level : 10 mV
2) Connect an RF Power Meter to the
[ANT1].
3) Adjust the RF power.
C576
(RF UNIT)
Maximum
output
power
TRANSMIT
TOTAL GAIN 1 • Frequency : 14.100 MHz
• Mode : USB
• MIC gain : Center
• Transmitting
1) Connect an Audio Generator to the
MIC jack (see the page 4-2) and set
it as;
Frequency : 1.5 kHz
Level : 1 mV
2) Connect an RF Power Meter to the
[ANT1].
3) Adjust the RF power.
R538
(RF UNIT)
130 W
TRANSMIT
HIGH POWER
(HF) 1 • Frequency : 14.100 MHz
• Mode : RTTY
• Transmitting
• Connect an RF Power Meter to the
[ANT1]. R2072 200 W
TRANSMIT
HIGH POWER
(50 MHz) 1 • Frequency : 50.100 MHz
• Mode : RTTY
• Transmitting
• Connect an RF Power Meter to the
[ANT1]. R2068 200 W
AM CARRYER
POWER 1 • Frequency : 14.100 MHz
• Mode : AM
• MIC input : OFF
• Transmitting
• Connect an RF Power Meter to the
[ANT1].
R2065 50 W
APC Vd
(Drain-Volatge) 1 • Frequency : 1.900 MHz
• Mode : RTTY
• Transmitting
• Connect the CP2051 to the GND.
CP2051
to the
GND
2 • Tu r n t h e R 2 0 4 2 m a x . c o u n t e r
clockwise.
R2042
(CCW rotation)
Max.
CCW
3 • Adjust the RF power with R2042. R2042 220 W
4 • Disconnect the CP2051 from the
GND.
CP2051
Disconnect
from GND
APC Id
(Drain-Current) 1 • Frequency : 24.900 MHz
• Mode : RTTY
• MIC : OFF
• Transmitting
• Connect the CP2051, CP2041 to the
GND.
CP2051, CP2041
to the
GND
2 • Set the variable resister to the preset
point.
R2006
90° to
CCW
3 • Disconnect the W1 from the PA200W
BOARD, and connect an Ammeter
between the PA200W BOARD and
W1.
R2006
(CW rotatioin)
12.0 A
4 • Disconnect the CP2051 and CP2041
from the GND.
CP2051, CP2041
Disconnect
from GND
(Center position)
90° to CCW