Icom IC-RP1620 Service Manual page 33

TRANSMITTER ADJUSTMENT
(CONTINUED)
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
*
LOGIC UNlT
ADJUSTMENT
R22
Deviation (ID)
check point
Deviation
(EXTERNAL)
adjustment
6 - 7
ADJUSTMENT CONDITIONS
Connect W1 (LOGIC UNIT).
Connect the FM deviation meter to
the [TX ANT] connector via the
attenuator and set as:
HPF
:
OFF
LPF : 20 kHz
De-emphasis: OFF
Detector
: (P-P)12
Transmitting
(
Ground the [MICROPHONE]
connector (pin 5).
)
DEVIATION
(ID)
DEVIATION
(EXTERNAL)
1
-
2
3
1
2
After adjustment, disconnect Wl.
VALUE
800 Hz
1 kHz
MEASUREMENT
ADJUSTMENT
POINT
Connect the SSG to the [RX ANT]
connector and set as:
Level : 1 .O mV* (-47 dBm)
Modulation : 1 kHz
Deviation : ~ 3 . 5 kHz
(Wide version)
*
1.75 kHz
(Narrow version)
Connect the audio generator to the
[ACC] socket, pin 4 (MOD) and pin 2
(GND) and set as:
Level
: 500 mV
Modulation : 1 kHz
Set the FM deviation meter as:
HPF : OFF
LPF : 20 kHz
De-emphasis : OFF
Detector : (P-P)i2
UNIT
LOGIC
Rear
panel
UNIT
LOGIC
LOCATION
Connect the
frequency counter to
R22.
FM deviation meter.
ADJUST
R21
R23
Rear
panel
Connect the AC
millivoltmeter to the
[ACC] socket, pin 5
(AF) and pin 2 (GND).
Connect the FM
deviation meter to
the F X ANT]
connector via the
attenuator.
20 mV
3.5 kHz
(Wide version)
1.75 kHz
(Narrow version)
LOGIC R45
R38