GV-D200 - Sony VCR Service Manual (repair manual). Page 121

5-31

[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. 5-3-18.

[Adjustment Procedure]
1)

Hi8/Standard8 AFM BPF fo adjustment

2)

Hi8/Standard8 AFM 1.5MHz deviation adjustment

3)

Hi8/Standard8 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

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

Playback

Signal

Hi8/Standard8 alignment tape:
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))

Measurement Point

AUDIO OUT jack LEFT or RIGHT

Measuring Instrument

Distortion meter

Adjustment Page

F

Adjustment Address

7D

Specified Value

The Main and Sub channel distortion
rate should be almost the same
(within ± 1%) and minimum.

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: 7D, change the data and minimize the
distortion rate.

4)

Press the PAUSE button.

5)

Set the Hi-Fi SOUND switch (menu display) to “1”.

6)

Select page: F, address: 7D, change the data and minimize the
distortion rate.

7)

Press the PAUSE button.

8)

Repeat steps 2) to 7) and set the data of address: 7D 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.

10) Select page: 0, address: 01, and set data: 00.
11) Set the Hi-Fi SOUND switch to “STEREO”.

Fig. 5-3-18.

VIDEO OUT

(75 

Ω

)

Pattern generator

AUDIO/VIDEO 

INPUT

Main Unit

Audio generator

Attenuator

600 

Ω

600 

Ω

: 270 

Ω 

(1-249-410-11) + 330 

Ω 

(1-249-411-11)

AUDIO
LEFT
(White)

AUDIO
RIGHT
(RED)

VIDEO
(Yellow)

L

R

AUDIO OUT

VIDEO OUT

Main unit

Monitor TV

47k 

Ω

47k 

Ω

47k 

Ω

(1-249-437-11)

Audio level meter 

or distortion meter