Sony GV-A500 Service Manual page 87

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 (75Ω 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.
H
Fig. 5-3-11.
5. RP Filter f0 Adjustment (VC-197 board)
Adjust the LPF of the playback RF amplifier.
Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Connection:
1) Input a 14.2 MHz, 400 mVp-p CW signal to Pin 7 of CN207
(RF AGC IN).
14.2MHz 400mVp-p
Signal
generator
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
A
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.
5-28
VTR stop
Arbitrary
Pin !∞ of CN207 (RF AGC OUT)
Oscilloscope
F
5B
A = Below 10 mVp-p
Pin !¡ of CN111
on VC-197 baord
(D 4.9V)
1k Ω
0.01 µ F
Pin 7 of CN207
(RF AGC IN)
Pin 5 of CN207
(REG GND)
47 Ω 15k Ω
Fig. 5-3-12.
A
14.2MHz
Fig. 5-3-13.