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

4-3 ADJUSTMENTS ON THE RF UNIT

ADJUSTMENT ADJUSTMENT CONDITION
PRERARATION 1 • Frequency
(Preset) • Mode
• ANTENNA
2
• [P.AMP1]
• Receiving
3
(MCF-M) 4
(MCF-W) 5
(MCF-N) 6
RECEIVE 1 • Frequency
SENSITIVITY • Mode
(HF BAND) • ANTENNA
• Receiving
IMAGE 1 • Frequency
RESPONSE • Mode
• ANTENNA
• Receiving
RECEIVE 1 • Frequency
SENSITIVITY • Mode
(50 MHz BAND) • ANTENNA
• [PREAMP2]
• Receiving
IF THROUGH 1 • Frequency
(50 MHz) • Mode
• Receiving
: 14.150 MHz • Connect a Digital multimeter to
: USB CP1102" (RF UNIT).
: [ANT1]
• Connect a Digital multimeter to
: "ON"
CP1103" (RF UNIT).
• Set R1228 (RF UNIT) to center
position.
• Set the L1401 and L1402 as below.
• Set the L1401 and L1402 as below.
• Set the L1401 and L1402 as below.
: 14.150 MHz 1) Connect an SSG to the [ANT1] and
: USB set as;
: [ANT1] Frequecy
Level
Modulation : None
2) Connect an AC Millivoltmeter to the
[EXP-SP].
3) Adjust the sensitivity with L1408
and L1058.
: 14.150 MHz 1) Connect an SSG to the [ANT1] and
: USB set as;
: [ANT1] Frequecy
Level
Modulation : None
2) Connect an AC Millivoltmeter to the
[EXP-SP].
3) Adjust the sensitivity with R1516
and C1656.
: 50.0200 MHz 1) Connect an SSG to the [ANT1] and
: USB set as;
: [ANT1] Frequecy
: "ON" Level
Modulation : None
2) Connect an AC Millivoltmeter to the
[EXP-SP].
3) Adjust the sensitivity with L1222.
: 50.0200 MHz 1) Connect an SSG to the [ANT1] and
: USB set as;
Frequecy
Level
Modulation : None
2) Monitoring the S-METER on the
display, adjust the swing width with
C1265.
4 - 5
OPERATION
Center position
3 rotations
Core
3.5 rotations
Core
4.5 rotations
Core
: 14.1515 MHz
: 0 dBµ
: 14.0765 MHz
: +94 dBµ
: 50.0215 MHz
: –10 dBµ
: 64.455 MHz
: +94 dBµ
ADJUSTMENT
VALUE
POINT
R1101
4.4–4.6 V
(RF UNIT)
R1132
4.4–4.6 V
(RF UNIT)
Center
R1228
position
(RF UNIT)
L1401, L1402
–
(MCF-M BOARD)
L1401, L1402
–
(MCF-W BOARD)
L1401, L1402
–
(MCF-N BOARD)
L1408, L1058
Max. audio
(repeatedly)
output level
(RF UNIT)
R1516, C1656
Min. audio
(RF UNIT) output level
L1222
Max. audio
(RF UNIT) output level
Min.
C1265
swing
(RF UNIT)
width