5 - 4
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
OPERATION
UNIT
ADJUST
SENSITIVITY
1 • Channel : CH16 (156.800 MHz)
•
[SQL]
: Max. counterclockwise
• Connect a distortion meter with a 4
Ω
load to the external speaker lead.
• Push
[PA•RX ]
for 1 sec. to turn the
RX speaker mode ON.
• Connect an SSG to the antenna
connector and set as ;
Frequency : 156.800 MHz
Level : +10 dB
µ
Modulation :1 kHz
Deviation : ±3 kHz
• Receiving
MAIN
Connect a DC volt meter
or oscilloscope to the
check point "CP3".
Maximum
voltage
MAIN L35
,
L36, L38,
L39
(Repeate two
times or more.)
SQUELCH
1 • Channel : CH16 (156.800 MHz)
•
[SQL]
: Max. counterclockwise
• Set the SSG as;
Level : −12 dB
µ
• Receiving
MAIN
Connect a volt meter or
o s c i l l o s c o p e t o t h e
check point "CP5".
1.0 V
MAIN
R214
5-4 RECEIVE ADJUSTMENT
L36
L35
L38
CP3
Sensitivity check point
R214
Squelch adjustment
CP5
Squelch check point
Sensitivity
adjustment
L39
Summary of Contents for IC-M422
Page 1: ...3 26 5 6 2 42 3 6 2 iC m422 ...
Page 6: ...2 1 SECTION 2 INSIDE VIEWS FRONT UNIT MAIN UNIT ...
Page 23: ...7 2 IC M422 sm indd 9 10 4 21 2005 1 01 32 PM ...
Page 24: ...8 1 SECTION 8 SEMICONDUCTOR INFORMATION TRANSISTOR AND FET S DIODES ...
Page 29: ...10 1 SECTION 10 BLOCK DIAGRAM IC M422 sm indd 21 22 4 21 2005 1 01 39 PM ...
Page 32: ...11 3 11 2 LOGIC BOARD IC M422 sm indd 27 28 4 21 2005 1 01 44 PM ...
Page 35: ...S 14131MZ C1 2005 Icom Inc ...