Sony CCD-TR918E, CCD-TR717E, CCD-TR417E, CCD-TR427E, CCD-TR617E, Service Manual, Page: 165 / 214

5-50
A
Approx. 2msec
Fig. 5-3-20.
1-4. 1.7 MHz Deviation Adjustment (VC-234 board)
Sets the spectrum of the R-ch ((L-R)/2 signal) level modulated during
recording. If deviated, the crosstalk signal of the audio signal will
occur and the audio level will drop during both playback and
recording.
Mode VTR recording
Signal Input the AFM DEV jig output signal
to the left and right audio input terminal
Measurement Point CH1: AFM DEV jig TP32
CH2: AFM DEV jig TP2
Measuring Instrument Oscilloscope
ADD mode
CH2 normal mode
Adjustment Page F
Adjustment Address 7C
Specified Value The level difference between CH1
signal and CH2 signal should be
minimum.
Switch setting:
Set the AFM DEV jig switches to the following positions.
S1 ........................... BIL Position
S2 ........................... PAL Position
S3 ........................... INV Position
Adjusting method:
1)
Set to recording mode. (Only for the PLAYER model, refer to
“Preparations only for the PLAYER model”.)
2) Match the vertical ranges of CH1 and CH2 of the oscilloscope
to each other.
3) Set the oscilloscope to the ADD mode and CH2 to the normal
mode.
4) Select page: 0, address: 01, and set data: 01.
5) Select page: F, address: 7C, change the data and minimize the
audio signal level difference (A).
6) Press the PAUSE button of the adjustment remote commander.
7) Select page: 0, address: 01, and set data: 00.
8) Perform “Processing after completed adjustment only for the
PLAYER model”.
1-5. Processing after completed adjustment only for the
PLAYER model
1) Select page: 0, address: 01, and set data: 01.
2) Only for the PLAYER model, select page: D, address: 14, and
set the data memorized at step 2) of “Preparations only for the
PLAYER model”.
3) Press the PAUSE button.
4) Only for the PLAYER model, select page: D, address: 15, and
set the data memorized at step 3) of “Preparations only for the
PLAYER model”.
5) Press the PAUSE button.
6) Select page: 0, address: 01, and set data: 00.
2. BPF f0 Adjustment (VC-234 board)
Sets the BPF passing frequency 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 Alignment tape:
For BPF adjustment
(WR5-11CS)
Measurement Point Audio output terminal 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 of the adjustment remote commander.
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 of the adjustment remote commander.
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 of the adjustment remote commander.
10) Select page: 0, address: 01, and set data: 00.
11) Set the Hi-Fi sound switch to “STEREO”.