7-9
2-7-2. VCO f
0
Adjustment (MA-303 Board)
[Adjustment Object]
To attain Hi-Fi audio compatibility.
If this apecification is not satisfied, the sound will be distorted.
Mode
Recording
Signal
No-signal
Measuring
Frequency counter
instrument
Measurement
CN501 pin
1
or AF SWP (RP-233 board)
point
1.3 MHz adjustment
Adjustment
RV521 (Lch)
element
Specified
1300
+ 1
kHz
Auto tracking ON
value
– 0
(Remote commander)
1.4 MHz adjustment
Adjustment
RV522 (Lch)
element
Specified
1400 ± 1kHz
value
1.7 MHz adjustment
Adjustment
RV531 (Rch)
element
Specified
1700
+ 1
kHz
Auto tracking OFF
value
– 0
(Remote commander)
1.8 MHz adjustment
Adjustment
RV532 (Rch)
element
Specified
1800 ± 1kHz
value
Note :
Connect the frequency counter through the buffer amplifier
(oscilloscope, etc) with high input resistance (1M
Ω
or more)
and low capacity (10pF or less).
[Adjusting Method]
1)
Connect pin
2
of CN891 to the ground.
2)
Set TRACKING button on the remote commander to AUTO.
3)
Adjust RV521 so as to obtain 1300
kHz.
4)
Adjust RV522 so as to obtain 1400 ± 1 kHz.
5)
Set TRACKING button on the remote commander to
MANUAL.
6)
Adjust RV531 so as to obtain 1700 kHz.
7)
Adjust RV532 so as to obtain 1800 ± 1 kHz.
2-7-3. Deviation Check (MA-303 Board)
Mode
Recording
Signal
400 Hz, –7.5 dBs : CN801 pin
68
Measurement
CN501 pin
1
or AF SWP (RP-233 board)
point
Measuring
Modulation Analyzer
instrument
Specified
50 ± 50kHz
value
[Check Method]
1)
Connect pin
2
of CN891 to the ground.
2)
Set TRACKING button on the remote commander to AUTO.
3)
Verify that the output signal satisfies the specification.
4)
Set TRACKING button on the remote commander to
MANUAL.
5)
Verify that the output signal satisfies the specification.
2-7-4. Band Pass Filter f0 Adjustment (MA-303 Board)
[Adjustment Object]
To separate the carrier accurately and ensure that the filter for cutting
the video signal functions normally.
If this specification is not satisfied, the sound will be distored.
Mode
Playback
Signal
1,608MHz, 200mVp-p : CN501 pin
3
Measurement
CN501 pin
1
point
Measuring
Oscilloscope
instrument
Adjustment
RV541
element
Specified
Adjust the A and B amplitudes to the same level.
value
(A–B=±2mVp-p)
[Adjusting Method]
1)
Connect pin
2
of CN891 to the ground.
2)
Set TRACKING button on the remote commander to AUTO.
(Lch signal output)
3)
Assume the output value at this time as A.
4)
Set TRACKING button on the remote commander to
MANUAL. (Rch signal output)
5)
Assume the output value at this time as B. Adjust RV541 so
that A is equal to B.
+ 1
– 0
+ 1
– 0
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