Sony GV-A500E, Service Manual

Page: 87 / 127

5-28
4. C OUT Level Adjustment (VC-197 board)
Set the chroma signal output level.
Note :
Insert the plug into the S video terminal.
Mode VTR stop
Subject Arbitrary
Measurement Point Chroma signal terminal of
S VIDEO terminal (75
Ω
terminated)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 58
Specified Value A = 286 ± 5 mV (NTSC)
A = 300 ± 5 mV (PAL)
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 01, data: 41 and press the PAUSE button
of the adjusting remote commander.
3) Change the data of page: F, address: 58, and set the burst level
(A) to the specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
6) Set page: 0, address: 01, data: 00.
Fig. 5-3-11.
H
A
5. RP Filter f0 Adjustment (VC-197 board)
Adjust the LPF of the playback RF amplifier.
Mode VTR stop
Subject Arbitrary
Measurement Point Pin
!∞
of CN207 (RF AGC OUT)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 5B
Specified Value A = Below 10 mVp-p
Connection:
1)
Input a 14.2 MHz, 400 mVp-p CW signal to Pin
7
of CN207
(RF AGC IN).
Transistor : General NPN transistor (2SC403, etc)
47 resistor :
1-249-401-11
1k resistor : 1-249-417-11
15k resistor : 1-249-431-11
0.01µF capacitor : 1-101-004-00
Fig. 5-3-12.
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 01, data: 35 and press the PAUSE button
of the adjusting remote commander.
3) Change the data of page: F, address: 5B, and minimize the 14.2
MHz signal level (A).
4) Press the PAUSE button of the adjusting remote commander.
5) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
6) Set page: 0, address: 01, data: 00.
Fig. 5-3-13.
Signal
generator
14.2MHz 400mVp-p
0.01
µ
F
47
Ω
15k
Ω
1k
Ω
Pin
!¡
of CN111
on VC-197 baord
(D 4.9V)
Pin
7
of CN207
(RF AGC IN)
Pin
5
of CN207
(REG GND)
A
14.2MHz