Icom IC-R75 Service Manual page 17

RECEIVER ADJUSTMENTS (continued)
ADJUSTMENT ADJUSTMENT CONDITION
1ST IF 1 • Displayed frequency
FILTER
• Mode
• PREAMP1
• IF FILTER1
• IF FILTER2
• set an SSG as
Frequency
Level
Deviation
Modulation
• Receiving
1 • Displayed frequency
RECEIVER
TOTAL GAIN
• Mode
• PREAMP1
• IF FILTER1
• IF FILTER2
• Set an SSG as
Frequency
Level
Modulation
2 • Set an SSG level as
• Receiving
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
• MAIN UNIT
MEASUREMENT
UNIT
Rear
: 14.10000 MHz panel
: FM
: ON
: 15 kHz
: 6 kHz
: 14.10000 MHz
: 0.32 µV*
(–10 dBµ)
: ±3.5 kHz
: 1 kHz
Rear
: 14.10000 MHz panel
: USB
: OFF
: 2.4 kHz
: 2.4 kHz
: 14.10150 MHz
: 500 µV*
(54 dBµ)
: OFF
: OFF
4 - 5
LOCATION
Connect the AC Maximum output level
milli-volt meter to
the [EXT SP] jack
with an 8 Ω load.
Connect the AC 0 dB
milli-volt meter to (1.0 V)
the [EXT SP] jack
with an 8 Ω load.
–30 dB
(10 mV)
EXT SP JACK
1st IF filter and receiver total gain check point
L462
L461
1st IF filter adjustment
R898
Receiver total gain adjustment
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
MAIN
Front [AF GAIN]
panel control
MAIN
L461,
L462
R898