Icom IC-7700, Service Manual

Page: 28 / 135

4-7-2 AUTOMATIC ADJUSTMENTS (RECEIVER)
ADJUSTMENT ADJUSTMENT CONDITION OPERATION
ADJUSTMENT
ITEM
VALUE
TOTAL GAIN
(PREPARATION) 1 • Receiving 1) Connect an AC millivoltmeter to
[EXT-SP].
2) Connect an SSG to the [ANT1] and
set it as;
Frequency : 14.1515 MHz
Modulation : None
– –
HF (P.AMP OFF) 1 • Receiving 1) Set the SSG as;
Level : +60 dBµ
2) Set the audio output level to 0 dB
(Set it as reference).
3) Set the SSG as;
Level :
"OFF"
4) Adjust the AF output level using
[MAIN DIAL], then push [F-7] key.
[Total Gain HF
PRE OFF]
–30 dB
HF (P.AMP ON) 2 • Receiving • Adjust the AF output level using
[MAIN DIAL], then push [F-7] key.
[Total Gain HF
PRE ON]
50MHz (P.AMP
OFF) 3 • Receiving • Adjust the AF output level using
[MAIN DIAL], then push [F-7] key.
[Total Gain 50M
PRE OFF]
50MHz (P.AMP
ON) 4 • Receiving • Adjust the AF output level using
[MAIN DIAL], then push [F-7] key.
[Total Gain 50M
PRE ON]
EXTERNAL AGC 1 • Receiving 1) Set the SSG as;
Level : +70 dBµ
2) Push [F-7] key.
3) W a i t u n t i l t h e b e e p " P i ! "
s o u n d s ( a p p r o x . 2 0 s e c . )
NEVER CHANGE the SSG output
level until the beep souds.
[AGC]
(Automatic
adjustment)
HF S-METER
HF (S0 LEVEL) 1 • Receiving 1) Set the SSG as;
Level : "OFF"
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the 2nd beep souds.
[HF S0 LEVEL]
(Automatic
adjustment)
HF (S9 LEVEL) 2 • Receiving 1) Set the SSG as;
Level : +34 dBµ
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the 2nd beep souds.
[HF S9 LEVEL]
HF (S9+60 dBu
LEVEL) 3 • Receiving 1) Set the SSG as;
Level : +94 dBµ
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the 2nd beep souds.
[ HF S9+60
LEVEL]
50MHz
S-METER
50MHz (S0
LEVEL)
4 • Receiving 1) Set the SSG as;
Frequency : 50.1515 MHz
Modulation : None
Level : "OFF"
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the beep souds.
[50M S0 LEVEL]
(Automatic
adjustment)
50MHz (S9
LEVEL) 5 • Receiving 1) Set the SSG as;
Level : +34 dBµ
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the beep souds.
[50M S9 LEVEL]
50MHz (S9+60 dBu
LEVEL) 6 • Receiving 1) Set the SSG as;
Level : +94 dBµ
2) Push [F-7] key. (the beep "Pi!" sounds)
3) Soon, another beeps "PiPi!" sound.
NEVER CHANGE the SSG output
level until the beep souds.
4) (Returns to adjustment main menu)
[50MHz (S9+60
dBu LEVEL)
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