Adjustment Procedures; Pll And Transmitter Adjustments - Icom IC-A22 Service Manual

SECTION 4

4-1 PLL AND TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITIONS
TUNE 1 • Displayed frequency
VOLTAGE • Receiving
REFERENCE 1 • Displayed frequency
Connect the RF power meter or a 50 Ω
FREQUENCY •
dummy load to the antenna connector.
• Transmitting
POWER 1 • Displayed frequency
• Apply no AF signal to the [MIC] jack.
• Transmitting
MODULATION 1 • Displayed frequency
• R5047, R5098
• Connect the AG to the [MIC] jack and
set as;
Frequency
Level
• Transmitting
2 • Set the AG as;
Level
SIDE TONE 1 • Connect the AG to the [MIC] jack and
set as;
Frequency
Level
• Transmitting

ADJUSTMENT PROCEDURES

: 118.025 MHz
: 136.975 MHz
pannel
: 118.025 MHz
pannel
: 136.975 MHz
: Center pannel
: 1 kHz
: 200 mV
: 20 mV
pannel
: 1 kHz
: 200 mV
4 - 1
MEASUREMENT
UNIT LOCATION
RF Connect the digital
multimeter or oscillo-
scope to CP2 (TUNE).
Top Loosely couple the
frequency counter to
the antenna connec-
tor.
Top Connect the RF power
meter to the antenna
connector.
Top Connect the modula-
tion analyzer to the
antenna connector via
an attenuator.
Top Connect the AC mil-
livoltmeter with an 8 Ω
dummy load to the
[SP] jack.
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
1.4–1.6 V RF R4068
136.975000 MHz RF C4101
±400 Hz
1.5 W RF R4057
(Carrier power)
85% MAIN R5098
30% MAIN R5047
20 mW (0.4 V) MAIN R5087