Icom IC-R7000 Service Manual page 31

RECEIVER ADJUSTMENT (Continued)
CONNECTIONS
AC
OSCILLO-
MILLI-
-
VOLTMETER
SSG
VOLTMETER
SCOPE
I
TO ANTENNA
TO [EXT SP)
I
CONNECTOR
EJ
SPEAKER
JACK TO CATHODE OF D21 (MAIN UNIT)
~
-
TO CATHODE OF D33 (IF UNIT)
-
MEASUREMENT
ADJUSTMENT
POINT
ADJUSTMENT
ADJUSTMENT CONDITIONS VALUE
UNIT LOCATION UNIT ADJUST
METER 1
• Display freq.: any FRONT METER
MAIN
R76
SQUELCH (except 762MHz) PANEL
~
•Mode: FM (narrow)
SIGNAL
5 9 +20 +40
• SQUELCH CONTROLC
-
~
-
SQUELCH
2 •SQUELCH CONTROL: More than S9+60dB Verify
Max. clockwise
NOTE: If the METER does not indicate more than S9+60dB at step 2, repeat "S-METER" adjustment.
CENTER 1
•Display freq.: 26.0000 MHz FRONT METER Same value as no
IF
R127
METER •Mode: FM (wide) PANEL signal receiving.
• R29, R32 (MAIN UNIT): Center
•Apply RF signal to ANTENNA
CONNECTOR.
Level: 32µV (-77dBm)
Mod.: OFF
Freq.: 26.0000 MHz
2 •Display freq.: 26.1000MHz
S9+50dB
MAIN R32
•RF signal freq.: 26.0000MHz
3 •Display freq.: 26.0000MHz Center R29
•RF signal freq.: 26.0000MHz
NOTE: Repeat steps 2 and 3 several times.
4
•Display freq.: 26.0000 MHz FRONT METER Center IF R92
• Mode: FM (narrow) PANEL
CENTER 1 • Display freq.:
MAIN Connect a
Frequency differen-
MAIN R66
STOP 26.0000 MHz± 3.5~5 kHz
voltmeter to
cies in the(+) and
• Mode: FM (narrow) cathode of D21.
(-)directions should
•Apply RF signal to ANTENNA
be the same, i.e.,
26.0035MHz and
CONNECTOR.
25.9965MHz when
Level: 32µV (-77dBm)
the voltage of.D21 is
Freq.: 26.0000 MHz
HIGH (8V).
NOISE 1 • Display freq.: 26.0000 MHz
IF
Connect an Noise wave form IF L10
BLANKER
•Mode: SSB oscilloscope to maximum
•NOISE BLANKER SWITCH: ON cathode of D33.
•Apply noise signal to ANTENNA
CONNECTOR.
AF GAIN 1 • Mode: FM (narrow) REAR Connect an AC
4.8V MAIN R124
•AF GAIN CONTROL: Max. PANEL millivoltmeter to
[EXT SP] JACK with
an 80 speaker.
6-10