Pll Adjustments; Transmitter Adjustments - Icom iC-M501EURO Service Manual

5-2 PLL ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
LOCK 1 • Operating channel : ch16
VOLTAGE • Receiving
2 • Operating channel : ch116
• Receiving
3 • Operating channel : ch16
• Output power
• Transmitting
4 • Operating channel : ch116
• Output power
• Transmitting
REFERENCE 1 • Operating channel : ch16
FREQUENCY • Output power
• Connect an RF power meter or a
50 Ω dummy load to the antenna
connector.
• Transmitting

5-3 TRANSMITTER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
OUTPUT 1 • Operating channel : ch16
POWER • Output power
• Transmitting
FREQUENCY 1 • Operating channel : ch16
DEVIATION • Output power
• Connect an audio generator to J7
(pin 5) with an AC millivoltmeter
and set as:
Frequency
Level
• Set an FM deviation meter as:
HPF
LPF
De-emphasis
Detector
• Transmitting
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
MEASUREMENT
UNIT
MAIN Connect a digital
multi-meter or oscil-
loscope to check
point CP1.
Connect a digital
: Low multi-meter or oscil-
loscope to check
point CP2.
: Low
Rear Loosely couple the
: Low Panel frequency counter
to the antenna con-
nector.
MEASUREMENT
UNIT
Rear Connect
: High Panel power meter to the
antenna connector.
Rear Connect
: Low Panel deviation meter to
the antenna con-
nector through an
attenuator.
: 1 kHz
: 30 mV
: OFF
: 20 kHz
: OFF
: (P–P)/2
5 - 2
VALUE
LOCATION
2.5 V
3.4–4.1 V
2.8 V
2.5–3.5 V
156.8000 MHz
VALUE
LOCATION
an RF 25 W
an FM ±4.3 kHz
ADJUSTMENT
POINT
UNIT ADJUST
MAIN L13
Verify
L10
Verify
MAIN C70
ADJUSTMENT
POINT
UNIT ADJUST
MAIN R84
MAIN R172