Audio System Adjustments - Sony Digital8 DCR-TRV410 Service Manual

3-6.

AUDIO SYSTEM ADJUSTMENTS

[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to the
video system measuring instruments as shown in Fig. 5-3-22.
[Adjustment Procedure]
1) Hi8/standard 8mm AFM BPF f
2) Hi8/standard 8mm AFM 1.5MHz deviation adjustment
3) Hi8/standard 8mm AFM 1.7MHz deviation adjustment
4) Digital8 playback level check
5) Overall level characteristics check
6) Overall distortion check
7) Overall noise level check
8) Overall separation check
In Recording
Pattern generator
Video output
(75 Ω )
Audio
oscillator
Attenuator
600 Ω (270 Ω (1-249-410-11) +330 Ω (1-249-411-11))
In Playback
Main unit
VIDEO
L
AUDIO
R
Fig. 5-3-22.
adjustment
0
Main unit
VIDEO
L
600 Ω
AUDIO
R
Audio level meter or
distortion meter
47k Ω
47k Ω :1-249-437-11
TV monitor
1. Hi8/standard 8mm AFM BPF f
(VC-213 board)
Sets the BPF passing frequency of IC760 so that the AFM signal
can separate from the playback RF signal properly. If deviated. the
mono/stereo mode will be differentiated incorrectly, and noises and
distortions will increase during high volume playback.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address\
Specified Value
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Set the Hi-Fi sound switch (menu display) to "2".
3) Select page: F, address: 64, change the data and minimize the
distortion rate.
4) Press the PAUSE button of the adjustment remote commander.
5) Set the Hi-Fi sound switch (menu display) to "1".
6) Select page: F, address: 64, change the data and minimize the
distortion rate.
7) Press the PAUSE button of the adjustment remote commander.
8) Repeat steps 2) to 7) and set the data of address: 64 so that the
distortions rates when the Hi-Fi sound switch is set to "2" and
set to "1" respectively are almost the same and minimum.
9) Press the PAUSE button of the adjustment remote commander.
10) Select page: 0, address: 01, and set data: 00.
11) Set the Hi-Fi sound switch to "STEREO".
5-63
Adjustment
0
Playback
Hi8/standard 8mm alignment tape:
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
Audio output terminal left or right
Distortion meter
F
64
The Main and Sub channel distortion
rate should be almost the same
(within ± 1%) and minimum.