Icom IC-910H Service Manual page 24

RECEIVER ADJUSTMENTS (continued)
ADJUSTMENT ADJUSTMENT CONDITION
430 M PEAK 1 • Display frequency: 435.0200 MHz
(MAIN BAND) • Mode
• Connect a standard signal generator
to [UHF ANT] connector and set as:
Frequency : 435.0200 MHz
Level
Modulation : 1 kHz/±5.0 kHz Dev.
• Receiving
430 M PEAK 1 • Sub display freq. : 435.0200 MHz
(SUB BAND) • Mode
• Set an SSG as
Frequency : 435.0200 MHz
Level
Modulation : 1 kHz/±5.0 kHz Dev.
• Receiving
430 M 1 • Display frequency: 435.0200 MHz
• Mode
TOTAL GAIN
(MAIN BAND) • Set an SSG as
Frequency : 435.0215 MHz
Level
Modulation : OFF
• Receiving
2 • Set an SSG as
Level
• Receiving
NOISE 1 • Display frequency: 145.9800 MHz
BLANKER • Mode
• [NB]
(MAIN BAND)
• Connect an SSG to [VHF ANT] con-
nector and set as :
Frequency : 145.98150 MHz
Level
Modulation : OFF
and apply following signal to [VHF
ANT] connector.
100 msec.
• Receiving
2 • [NB]
• Set an SSG as
Level
• Receiving
(SUB BAND) 3 • Sub display freq. : 145.9800 MHz
• Mode
• [NB]
• Set an SSG as
Level
• Receiving
4 • [NB]
• Set an SSG as
Level
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
MAIN
: FM
: 1 µV* (–107 dBm)
MAIN
: FM
:
: 1 µV* (–107 dBm)
Rear
: USB panel
:
: 1 mV* (–47 dBm)
:
: OFF
MAIN
: USB
: OFF
: 5.6 µV* (–92 dBm)
1 msec.
: ON
:
: 3.2 µV* (–97 dBm)
: USB
: OFF
:
: 5.6 µV* (–92 dBm)
: ON
:
: 3.2 µV* (–97 dBm)
MEASUREMENT
LOCATION
Connect a digital
multimeter or oscillo-
scope to check point
CP851.
Connect a digital
multimeter or oscillo-
scope to check point
CP852.
Connect an AC milli-
volt meter to [EXT
SP] connector with
an 8 Ω load.
100 mV (20 dB of AF
level difference as step
1.)
Connect an oscillo- Maximum noise wave-
scope to check point form
CP101.
The noise must be
blanked.
Connect an oscillo- Maximum noise wave-
scope to check point form
CP701.
The noise must be
blanked.
5 - 6
ADJUSTMENT
POINT
VALUE
UNIT
Maximum voltage PA
Maximum voltage PA
1.0 V (0 dB) Front
panel
PA
MAIN
ADJUST
L22,
L23,
L282,
L283
L280,
L281
main [AF]
volume
R61
L102,
L103
Verify
L703,
L704
Verify