![background image](http://html.mh-extra.com/html/icom/ic-7700/ic-7700_service-manual_612323013.webp)
4 - 1
SECTION 4
ADJUSTMENT PROCEDURE
4-1 PREPARATION
¤
REQUIRED EQUIPMENTS
EQUIPMENT
SPECIFICATION
EQUIPMENT
SPECIFICATION
Spectrum analyzer
Frequency range
: At least 90 MHz
Bandwidth
: 100 kHz or more
Digital multimeter
Input impedance
: 50 k
Ω
/DC or more
Measuring range : Voltage: 0.1–10V
Current: 5A/30A
RF power
(terminated type)
Measuring range
: 10–300 W
Frequency range
: 1.8–100 MHz
Impedance :
50
Ω
SWR
: Less than 1.2 : 1
Standard Signal
Generator (SSG)
Frequency range : 0.1–100 MHz
Output level
: 0.1 µV to 32 mV
(–127 to –17 dBm)
Frequency Counter
Frequency range
: 0.1–100 MHz
Frequency accuracy : ±0.5 ppm or better
Input level
: Less than 1 mW
AC Millivoltmeter
Measuring range : 10 mV to 10 V
Modulation
Analyzer
Frequency range
: 30–300 MHz
Measuring range
: 0 to ±10 kHz
External Speaker
Input impedance
: 8
Ω
Capacity
: More than 5 W
Audio Generator
Frequency range
: 300–3000 Hz
Output level
: 1–500 mV
Attenuator
Power attenuation : 50 or 60 dB
Capacity
: More than 200 W
¤
EXPOSING UNITS
OSC UNIT cover
RF UNIT cover
Bottom cover
PLL/SCOPE UNITs cover
1) Remove 8 screws from the both sides.
2) Remove 7 screws from the bottom, then remove the
bottom cover.
3) Turn over the transceiver.
4) Remove 8 screws from the RF UNIT cover, 10 screws
from the PLL/SCOPE UNITs cover and 10 screws
from the OSC UNIT cover, then remove those covers.
CAUTION: The transceiver weighs approx. 22.5 kg (50 lb). Always have two people available to carry, lift or turn over the transceiver.
CAUTION!:
BACK UP originally programmed contents (Memory channels, Common settings, etc.) in the transceiver before
starting adjustment. When all adjustments are completed, these contents in the transceiver will be cleared.