Icom IC-M710RT, Руководство по обслуживанию

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4-5 RECEIVER ADJUSTMENTS
RECEIVER
GAIN
CLARITY
TOTAL GAIN
S-METER
NOISE
BLANKER
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
1
2
1
2
1
• Display frequency : 2.1820 MHz
• Mode
: J3E
• Noise blanker : OFF
• Squelch : OFF
• Speaker : OFF
• AGC : ON
• RF gain : 9
• R223 (MAIN unit) : Max. clockwise
• R257 (MAIN unit) : Max.counter
clockwise
• R300 (MAIN unit) : Center
• Connect a standard signal genera-
tor to the [ANT] connector and set
as:
Frequency : 2.1815 MHz
Level : 0.5 µV*
(–113 dBm)
Modulation : OFF
• Receiving
• While pushing the [SQL] and [CE]
switches, turn power ON.
• Display frequency : 12.2300 MHz
• Mode
: J3E
• Connect a standard signal genera-
tor to the [ANT] connector and set
as:
Frequency : 12.2315 MHz
Level : 0.32 mV*
(–57 dBm)
Modulation : OFF
• Receiving
• Set the signal generator to OFF (no
output).
• While pushing the [SQL] and [RX]
switchs, turn power ON.
• Display frequency : 12.2300 MHz
• Mode
: J3E
• Connect a standard signal genera-
tor to the [ANT] connector and set
as:
Frequency : 12.2315 MHz
Level : 1 mV*
(–47 dBm)
• Receiving
• Display frequency : 12.2300 MHz
• Mode
: J3E
• Connect a standard signal genera-
tor to the [ANT] connector and set
as:
Frequency : 12.2315 MHz
Level : 3.2 µV*
(–97 dBm)
Add the following signal into
the signal generator output.
• Receiving
Muximum output level
1.0 V
–30 dB (32 mV)
Push the [DIMMER]
switch.
7th dot just appears
while pushing the
[DIMMER].
Adjust the maximum
noise wave displayed
on the oscilloscope.
Adjust in
sequence
L74, L75,
L78, L79,
L83, L84,
L85, L92,
L93
[CLARITY],
[DIMMER]
[VOLUME]
R223
[DIMMER]
Verify
L80, L81
Connect an AC milli-
voltmeter to the [EXT
SP] jack with a 4
Ω
dummy load.
Connect an AC milli-
voltmeter to the [EXT
SP] jack with a 4
Ω
dummy load.
S/RF meter
Connect an oscillo-
scope to R59.
MAIN
Front
Panel
Front
Panel
MAIN
Font
Panel
MAIN
Rear
Panel
Rear
Panel
Function
display
MAIN
Set the [CLARITY] control to the center position and
push the [DIMMER] switch.
1 2 3 4
1 msec.
100 msec.
*This output level of the standard signal generator (SSG) is indicated as SSG’s open circuit.