Icom IC-7800, Service Manual

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SOFTWARE ADJUSTMENTS–Continued
EXTERNAL
AGC
HF
S-METER
50 MHz
S-METER
REFERENCE
FREQUENCY
ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION
• C o n n e c t a n S S G t o [ A N T 1 ]
connector and set as;
Frequency : 14.1515 MHz
Level : 3.2 mV* (–37 dBm)
Modulation : OFF
• Set the SSG as;
Frequency : 14.1515 MHz
Level : OFF
• Set the SSG as;
Level
: 50 µV* (–73 dBm)
• Set the SSG as:
Level
: 50 mV* (–13 dBm)
• Set an SSG as;
Frequency : 51.1515 MHz
Level : OFF
• Set an SSG as;
Level
: 50 µV* (–73 dBm)
• Set an SSG as;
Level
: 50 mV* (–13 dBm)
• Connect a frequency counter to the
J490 (MAIN unit).
• Push [F2 (REF)] to enter the REF
adjustment mode.
1
2
1
2
3
1
2
3
1
AGC(RX-DSP)A
AGC(RX-DSP)B
HF S0 LEVEL
HF S9 LEVEL
S9+60 LEVEL
50M S0 LEVEL
50M S9 LEVEL
S9+60 LEVEL
REF OSC
Push [F-7 (SET)] to set the external AGC level
and selects the next adjustment item.
Push [F-7 (SET)] to set the external AGC level
and selects the next adjustment item.
• Push [F-7 (SET)] to set the HF S0 meter
indication and selects the next adjustment
item.
NEVER change the SSG output level until 2
short beeps are sound.
• Push [F-7 (SET)] to set the HF S9 meter
indication and selects the next adjustment
item.
NEVER change the SSG output level until 2
short beeps are sound.
• Push [F-7 (SET)] to set the HF S9+60 meter
indication and selects the next adjustment
item.
NEVER change the SSG output level until 2
short beeps are sound.
• Push [F-7 (SET)] to set the 50 MHz S0 meter
indication and selects the next adjustment
item.
NEVER change the SSG output level until 2
short beeps are sound.
• Push [F-7 (SET)] to set the 50MHz S9 meter
indication and selects the next adjustment
item.
NEVER change the SSG output level until 2
short beeps are sound.
• Push [F-7 (SET)] to set the 50 MHz S9+60
meter indication and selects the opening
screen.
NEVER change the SSG output level until 2
short beeps are sound.
Rotate [MAIN DIAL] to set the reference
frequency to 10.0000000 MHz.
Push [F-7 (SET)] to set the frequency and
return to the opening screen.
NOTE: Adjustment the reference
frequency at least 5 minutes has
been past from the IC-7800’s main
power (on the rear panel) is turned
ON.
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
After adjustment exiting from the adjustment mode when the transceiver is power OFF.