Icom IC-7800 Service Manual Addendum page 381

RXPLL-A UNIT ADJUSTMENTS–Continued
ADJUSTMENT ADJUSTMENT CONDITION
IMAGE 1 • MAIN display frequency
RESPONSE
• Mode
• Connect an SSG to [ANT1] connec-
tor and set as;
Frequency : 14.0765 MHz
Level
Modulation : OFF
• Receiving
RX 1 • MAIN display frequency
SENSITIVITY
(50 MHz) • Mode
• Pre-amp. 2
• Connect an SSG to [ANT1] connec-
tor and set as;
Frequency
Level
Modulation
• Receiving
1 • MAIN display frequency
IF THROUGH
(50 MHz)
• Mode
• Connect an SSG to [ANT1] connec-
tor and set as;
Frequency : 64.455 MHz
Level
Modulation : OFF
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
UNIT
Rear
: 14.150 MHz panel
: USB
: 50 mV* (–13 dBm)
Rear
: 50.020 MHz panel
: USB
: ON
: 50.0215 MHz
: 0.32 µV* (–117 dBm)
: OFF
Front
: 50.020 MHz panel
: USB
: 50 mV* (–13 dBm)
MEASUREMENT
LOCATION
Connect an AC milli-
volt meter to [EXT SP]
jack with 8 Ω load.
Connect an AC milli- Maximum audio level
volt meter to [EXT
SP] jack with 8 Ω
load.
S-meter
4 - 8
ADJUSTMENT
VALUE
UNIT
Minimum audio level RX
PLL-A
RX
PLL-A
Minimum level RX
PLL-A
POINT
ADJUST
Adjust
repeatedly
R1516,
C1656
L1222
C1265