Adjustments On The Main Unit (Including Rf Unit) - Icom IC-7700 Service Manual

4-5 ADJUSTMENTS ON THE MAIN UNIT (including RF UNIT)

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