Adjustments On The Scope Unit - Icom IC-7700 Service Manual

4-6 ADJUSTMENTS ON THE SCOPE UNIT

ADJUSTMENT ADJUSTMENT CONDITION
PREPARATION 1 • Frequency
(Common setting) • Mode
• [P.AMP]
• [SCOPE]
• [SCOPE ATT]
• [SPAN]
3rd LO LOCK 1
VOLTAGE
SCOPE 1 • Receiving
2 • Receiving
3 • Receiving
SCOPE GAIN 1 • Receiving
SCOPE 1 • [SCOPE ATT]
ATTENUATION • Receiving
: 14.200 MHz
: CW
: "OFF"
: "ON"
: "OFF"
: ±25 kHz
1) Connect a Digital multimeter to the
– CP801.
2) Adjust the lock voltage.
• Connect a Signal Generator to [ANT1]
and set as;
Frequency
Modulation
Level
• Connect a Signal Generator to J1
(SCOPE UNIT) and set as;
Frequency
Modulation
Level
• Connect a Signal Generator to [ANT1]
and set as;
Frequency
Modulation
Level
• Adjust the waveform to set the peak
of the wave spectrum reaches the 6th
scale.
: 30 dB • Adjust the waveform to set the peak
of the wave spectrum reaches the 3rd
scale.
<fig. 1>
6th scale
<fig. 2>
3rd scale
4 - 11
OPERATION
–
: 14.200 MHz
: None
: +54 dBµ
: 71.715 MHz
: None
: +100 dBµ
: 14.200 MHz
: None
: +54 dBµ
ADJUSTMENT
VALUE
POINT
– –
C824 2.2–2.8 V
L203→L202→
Maximum
L201→L5→L6→
waveform
C41 (in sequence)
on the
and
SCOPE
L5, L6, C41
screen
(repeatedly)
Minimum
waveform
C41 on the
SCOPE
screen
Maximum
waveform
L5, L6
on the
(repeatedly)
SCOPE
screen
R416 (see fi g. 1).
R11 (see fi g. 2)