Sony CCD-M8, Руководство по обслуживанию

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3-5. AUDIO SYSTEM ADJUSTMENT
Connection of audio measurement equipment:
Connect as shown below when inputting audio signal to
MIC connector.
MD- 10 board
Refer to the Service Manual for the playback equipment
when measuring using playback equipment.
Adjustment Order
1 ) AFM Carrier Frequency Adj ustmnt
2) Carrier Level Check
3 ) Deviation Adjustment
4) Noise Level Check
5 ) Frequency Response Check
6) AGC Check
7) Distortion Check
3-5-1 . AFM Carrier Frequency Adjustment (AU- 1 6 Board)
Mode: Recording
Audio input signal : no signal MIC connector pin
)
(yellow) and pin
®
(white).
Frequency counter:
AU- 1 6 board pin
Q)
Adjustment Procedure:
Turn RV40 1 on the AU- 1 6 board
and a�u� to 1 5 07 ±2 kHz.
3-5-2. Carrier Level Check (AU- 1 6 Board)
Mode:
Recording
Audio input signal : no signal
Oscilloscope: AU- 1 6 board pin
Q)
Adjustment Procedure: Check that the signal level is 1 20
±20 m Vp-p. (Fig. 3- 1 8 )
120 ±20
m
Vp-p
Fig.
3- 18
Carrier level check
3-5-3. Deviation Adjustment
Adjustment Procedure:
1 ) Play back the reference tape (WR5-3NS) on playback
equipment (EV-A300, EV-S700, etc.) and measure
AU DIO OUT level (S d B).
2 ) Input 4 0 0 H z - 6 6 dB to CCD-M8/M8u M I C connector
pin
0
(white) and record for more than 1 0 seconds.
3 ) Play back the p ortion recorded in step 2 ) on playback
equipment and confirm that the AUDIO OUT level is
S ± 1 dB.
4) If the specifications are not met, adjust according to
the following.
i )
I f level is smaller than S - 1 d B :
Turn RV402 on the AU- 1 6 board counterclock­
wise and adjust so that the specifications are met
by repeating steps 2) and 3 ).
ii) If level is larger than S
+
1 d B :
Turn RV402 on the AU- 1 6 board clockwise and
adjust so that the specifications are met by re­
peating steps 2) and 3 ).
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