Main Unit Adjustments - Icom IC-7800 Service Manual
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Also See for IC-7800:
- Service manual addendum (555 pages) ,
- Instruction manual (230 pages) ,
- Service manual (209 pages)
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4-7 MAIN UNIT ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT CONDITION
MAXIMUM
1
• Turn the power OFF
OUTPUT
• Perform the all reset operation;
POWER
push and hold [F-INP] and [MW],
then power ON.
NOTE: Save the memory contents
and set mode setting conditions
into the CF memor y card is
recommented.
• Preset R93 to 3 o'clock position.
• Receiving
2
• Connect an audio generator to
[MIC] connector and set as
;
Frequency : 1.5 kHz
Level
• Transmitting
• Mode
RESIDUAL
1
• Connect an audio generator to
AM
[MIC] connector and set as;
Frequency : 1.0 kHz
Level
• Transmitting
• MAIN display frequency
TX TOTAL
1
GAIN
• Mode
• [MIC] gain
• Connect an audio generator to
[MIC] connector and set as;
Frequency : 1.5 kHz
Level
• Transmitting
• MAIN display frequency
HIGH POWER
1
(HF)
• Mode
• Transmitting
• MAIN display frequency
2
(50 MHz)
• Mode
• Transmitting
• MAIN display frequency
1
AM CARRIER
POWER
• Mode
• Apply no audio signals to [MIC]
connector.
• Transmitting
• MAIN display frequency
1
Id-APC
• Mode
• Connect CP81 to GND.
• Preset R93 to 90˚ CCW.*
• Transmitting
*CCW: Counter clockwise
UNIT
MAIN
Rear
panel
: 1 mV
: FM
Rear
panel
: 10 mV
Rear
: 14.100 MHz
panel
: USB
: 12 o'clock position
: 1 mV
Rear
: 14.100 MHz
panel
: RTTY
: 50.100 MHz
: RTTY
Rear
: 14.100 MHz
panel
: AM
PA
: 14.100 MHz
: RTTY
MEASUREMENT
LOCATION
C o n n e c t a d i g i t a l
m u l t i m e t e r
o r
oscilloscope to CP82.
Connect an RF power
Maximum output power
m e t e r t o [ A N T 1 ]
connector.
Connect an RF power
M i n i m u m
m e t e r t o [ A N T 1 ]
difference between an
connector.
audio generator is ON
and OFF.
Connect an RF power
m e t e r t o [ A N T 1 ]
connector.
Connect an RF power
m e t e r t o [ A N T 1 ]
connector.
Connect an RF power
m e t e r t o [ A N T 1 ]
connector.
C o n n e c t
a
D C
ammeter between W1
and EP501.
4 - 20
ADJUSTMENT
POINT
VALUE
UNIT
0.5 V ±0.2 V
MAIN
MAIN
MAIN
l e v e l
MAIN
130 W
MAIN
200 W
200 W
MAIN
55 W
MAIN
12 A
ADJUST
R69
Adjust in
sequence
repeatedly
L505,
C576,
L512
C576
R538
R81
R79
R82
R93
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