Pll Adjustment; Receiver Adjustment - Icom IC-706 Service Manual

4-2 PLL ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS
VALUE
POINT
UNIT
LOCATION UNIT
ADJUST
REFERENCE
1 • Displayed frequency:
Any
PLL
Connect an RF voltmeter Maximum level PLL
L37,L38
FREQUENCY
• L36 (PLL unit)
:
Center
to P3. (0 dBm or more)
I--
• Receiving
2
Connect a frequency 60.000000 MHz L34,L36
counter to P3.
REFERENCE 1 • Displayed frequency:
0.03000 MHz
PLL Connect a digital multi- 2.0 V
PLL
C104
LOOP LOCK
• Mode
USB
meter or oscilloscope to
VOLTAGE
• Receiving
LV1.
MAIN LOOP 1 • Displayed frequency:
30.00000 MHz
PLL Connect a digital multi- 1.1 V PLL L6
LOCK
• Mode
: USB
meter or oscilloscope to
VOLTAGE
• Receiving
LV2.
2 • Displayed frequency:
60.00000 MHz
1.1 V L3
4-3 RECEIVER ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITIONS VALUE
POINT
UNIT LOCATION UNIT ADJUST
SENSITIVITY
1 • Displayed frequency :
14.10000 MHz
Rear Connect an AC millivolt- Maximum output MAIN Adjust
• Mode
: USB
panel meter to [EXT SP] jack level repeatedly
• (RIT]
: OFF
with an 8
n
dummy load.
L47, L48,
• [M4AGC)
: Fast (F
AGC)
L49, L53,
• [M3NB]
: OFF
L54, L55,
• [P.AMP/ATT]
: Preamp
L84,L85
• [COMP GAIN]
: Center
• (BEEP/SIDE T]
: Center
• [VOX GAIN]
: Center
• (ANTI VOX]
: Max. counterclockwise
• R126 (MAIN unit): Max. counterclockwise
• Connect a standard signal generator to
[ANT 1] and set as:
Frequency: 14.10150 MHz
Level
:
0.5 JiV'
H
13 dBm)
Modulation: OFF
• Receiving
2 • Mode FM
Connect a distortion Minimum Adjust
• [M3NAR]
:
OFF
meter to [EXT SP] jack. distortion level repeatedly
• Set the standard signal generator as:
L47, L48,
Frequency: 14.10000 MHz
L49
Level
: 0.5 mV • (-53 dBm)
Modulation: 1 kHz
Deviation
:
±5kHz
3 • [M3NARj : ON
Adjust
• Set the standard signal generator as:
repeatedly
Deviation: ±4 kHz
L53,L54
4 • Displayed frequency: 146.00000 MHz PA
Adjust
• [M3 NARj
OFF
repeatedly
• Connect the standard signal generator to
L29,L30
[ANT 2] and set as:
frequency: 146.00000 MHz
Deviation
:
±3.5kHz
* This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
4-2