Icom IC-725 Service Manual page 27

6·3 RECEIVER ADJUSTMENT
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT ADJUSTMENT CONDITIONS VALUE
UNIT LOCATION UNIT ADJUST
BFO
1
•Displayed frequency: 14.10000 MHz MAIN Connect the 9.01300 MHz MAIN C294
FREQUENCY •Mode : USB frequency counter to
•Receiving • R266.
2 •Mode :CW 9.01060 MHz L83
•Transmitting
3 •Mode
:LSB
9.01000 MHz L82
•Receiving
4
•Mode
:CW
9.00980 MHz
Verify
(±150 Hz)
5 •Mode :AM No output
SENSITIVITY 1 •Displayed frequency: 14.10000 MHz
Rear Connect the AC milli- Pre-set to max. CW. MAIN R138
•Mode :USB
panel voltmeter to the
• [RIT] switch :OFF [EXT SP] jack with
• [AGC] switch : IN (Fast) an 8
a
load. Maximum audio output L33, L34,
• [ATT] switch :OFF level L35, L36,
•[NB] switch :OFF
L16, L17,
• [PRE] switch :ON L21, L22,
•[SOL] control :Max. CCW L23, L79,
• Set the signal generator;
L78, L77
Level : 0.16 µV (-123 dBm)
Modulation : OFF
•Receiving
TOTAL GAIN 1 •Displayed frequency: 14.10000 MHz
Rear Connect the AC milli· 1.0 V (0 dB) Front
[AF]
•Mode : USB panel voltmeter to the panel control
• [PRE] switch :OFF [EXT SP] jack with
• Set the signal generator; an 8
a
load.
Level : 1.0 mV (-47 dBm)
Modulation: OFF
•Receiving
2 • Set the signal generator; 30 mV (-30 dB) MAIN R138
Level :OFF
S-METER 1 • Displayed frequency: 14.10000 MHz
Front Meter
S9
MAIN R116
•Mode
: USB
panel
• [PRE] switch :OFF
• Set the signal generator;
Level : 50 µV (-73 dBm)
Modulation: OFF
•Receiving
2 •Set the signal generator;
59+60 dB
R110
Level : 50 mV (-13 dBm)
3 Repeat above adjustments 1 and 2 a couple of times.
6-4