Icom IC-7800 Service Manual Addendum page 393

4-7 MAIN UNIT ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION
MAXIMUM 1 • Turn the power OFF
OUTPUT • Perform the all reset operation;
push and hold [F-INP] and [MW],
POWER
then power ON.
NOTE: Save the memory contents
and set mode setting conditions into
the CF memory card is recomment-
ed.
• 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
1
RESIDUAL
• 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 1
POWER
• Mode
(HF)
• Transmitting
• MAIN display frequency
(50 MHz) 2
• Mode
• Transmitting
• MAIN display frequency
AM CARRIER 1
POWER
• Mode
• Apply no audio signals to [MIC]
connector.
• Transmitting
• MAIN display frequency
Id-APC 1
• 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
Connect a digital mul-
timeter or oscilloscope
to CP82.
Connect an RF power
meter to [ANT1] con-
nector.
Connect an RF power Minimum level differ-
meter to [ANT1] con- ence between an audio
nector. generator is ON and
OFF.
Connect an RF power
meter to [ANT1] con-
nector.
Connect an RF power
meter to [ANT1] con-
nector.
Connect an RF power
meter to [ANT1] con-
nector.
Connect a DC amme-
ter between W1 and
EP501.
4 - 20
ADJUSTMENT
POINT
VALUE
UNIT
0.5 V ±0.2 V MAIN
Maximum output MAIN
power
MAIN
130 W MAIN
200 W MAIN
200 W
55 W MAIN
12 A MAIN
ADJUST
R69
Adjust in
sequence
repeatedly
L505,
C576,
L512
C576
R538
R81
R79
R82
R93