9-6. Audio System Adjustment - Sony Video8 Handycam CCD-TR71 Service Manual

9-6. AUDIO SYSTEM ADJUSTMENT
e Perform the adjustment using the color bar signal as a video
signal input.
[Connecting the measuring Instruments for the audio]
Connect the audio system measuring instruments besides the
video system measuring instruments as shown in Fig. 9-25, and
perform adjustments with the power switch [video] position.
Switch the input/output switchover switch in accordance with the
mode as follows.
¢ Input position ------- Recording mode
e Output position -----Playback mode
Adjust the bilingual switch (CF-3200 board S12) to the following
position unless specified otherwise.
e Green (stereo) position
Use an extension cord if necessary.
e For AU-135 board (30P, 0.8 mm)
Part code: J-6082-135-A
Note: 1) When inputting the audio signal, input the same signal
to both L, and R channels, unless specified otherwise.
2) Be sure to insert the plug (shorting plug or dummy
plug, etc.) into the audio input/output terminal (right).
If the plug is not inserted, the unit will be set into the
monaural mode, and correct adjustments cannot be
carried out.
(Monaural mode)
During recording -- REC AFM RF1.7 MHz carrier will
not be output. ,
During playback: The L+R signal will be output from
the audio input/output terminal (left).
3) The items to be adjusted for the R channel will be
indicated within the [ ], in regard to the adjusting
items to be adjusted for both L and R channels.
Audio level meter or distortion meter
Audio
transmitter
Attenuater
47TkQ
Connect during
recording Connect during
playback
Video input/output
terminal (J901)
When connecting the input/output equipment simultaneously,
adjust the input/output switchover switch to the [input] position,
and connect the audio oscillator/attenuater to the audio
input/output terminal.
Connect the audio level meter or the distortion meter as shown
Audio level
meter or
re on distortion
ts > Right meter
Fig. 9-25.
[Adjustment Procedure]
1) IR adjustment
2) 1.5 MHz carrier frequency check
3) 1.7 MHz carrier frequency check
4) 1.5 MHz recording level check
5) 1.7 MHz recording level check
6) E-E output level check
7) REC matrix L-R check
8) REC matrix L+R check
9) 1.5 MHz deviation adjustment
10) 1.7 MHz deviation adjustment
11) PB matrix L adjustment
12) PB matrix R adjustment
13) Overall level characteristics, distortion check
14) Separation check
15) Overall noise level check
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