Icom IC-R7000 Service Manual page 25

6·3 LOCAL OSCILLATOR ADJUSTMENT
INSTRUMENTS REQUIRED
(1) FREQUENCY COUNTER
• FREQUENCY RANGE : 0.1 MHz-1.3GHz
•ACCURACY : BEITER THAN ± 1 ppm
• SENSITIVITY : 100mV OR BEITER
(2) RF VOLTMETER
• FREQUENCY RANGE : AT LEAST 500MHz
• MEASURING RANGE : o.01-1ov
ADJUSTMENT ADJUSTMENT CONDITIONS
3rd LO 1 •Mode: SSB
OUTPUT
FREQUENCY
(IF UNIT)
2 •Mode: SSB
• USB/LSB SELECTOR SWITCH: USB
3 •Mode: SSB
• USB/LSB SELECTOR SWITCH: LSB
MULTIPLIER
1 • 1 GHz BAND SWITCH: ON
(Q14, Q16)
OUTPUT
LEVEL
(MAIN UNIT)
DOUBLER
1 • 1 GHz BAND SWITCH: ON
OUTPUT
LEVEL
(DOUBLER
UNIT)
DOUBLER
1 • 1 GHz BAND SWITCH: ON
OUTPUT
FREQUENCY
(MAIN UNIT)
MAIN AND DOUBLER UNITS
Doubler Output Level and
Doubler Output Frequency---W1
Check Point
MAIN UNIT
L2
Doubler Output
----.----=:+---
Frequency Adjustment
CONNECTIONS
FREQUENCY
COUNTER
TO R154 (IF UNIT), W22 (IF UNIT),
OUTPUT TERMINAL
(DOUBLER UNIT)
RF VOLT·
TO C1 (DOUBLER UNIT),
METER
OUTPUT TERMINAL
(DOUBLER UNIT)
MEASUREMENT
VALUE
UNIT LOCATION
IF
Connect a
10.2450MHz
frequency counter
to R154.
Connect a 456.5kHz
frequency counter
to W22.
453.5kHz
DOUBLER Connect a Maximum
spectrum analyzer
or RF voltmeter to
C1.
Connect a Maximum
spectrum analyzer
or RF voltmeter to
output terminal
(W1) of DOUBLER
UNIT.
Connect a 1GHz
frequency counter
to output terminal
(W1) of DOUBLER
UNIT.
Doubler Output Level Adjustment
a -
Multiplier (Q14, Q16) c
1
Output Level Check Point
Multiplier (Q14, Q16)
Outp~~:--~
Level and Doubler Output L6;------'
Level Adjustment L B - - - - - - '
6-4
E
ADJUSTMENT
POINT
UNIT ADJUST
IF C71
L15
C134
MAIN
L3, L4, L5,
L6, LS
MAIN L3, L4, L5,
L6, LS
DOUBLER C4,C5,C6
MAIN L2