Vco Adjustment (Pd-88 Baord); H Pos Adjustment (Vc-197 Baord) - Sony GV-A500 Service Manual

2. VCO Adjustment (PD-88 baord)

Set the VCO freerun frequency. If deviated, the LCD screen will be
blurred.
Mode VTR stop
Signal No signal
Pin 7 of CN802 (HDB) of VC-197
Measurement point
board
Measuring instrument Frequency counter
Adjustment page D
Adjustment address 58
Specified value f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
Note : Press the DISPLAY button and erase the screen indictors
on the LCD screen.
Adjusting method:
1) Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 01, data: 37 and press the PAUSE button
of the adjusting remote commander.
3) Change the data of page: D, address: 58, and set the HDB signal
frequency (f) 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.

3. H POS Adjustment (VC-197 baord)

Adjusts the horizontal position of picture on LCD display.
Mode
Signal
Measurement point
Measuring equipment
Adjustment page
Adjustment address
Specification
Note : Set the LCD so that it is directed toward the lens. (The
waveform is different depending upon direction.)
Adjusting method:
1) Set page :0, address: 01, data: 01
2) Change the data of page: D, address: 5C and set the signal
level (T) to the specified value.
3) Press the PAUSE button of the adjusting remote commander.
4) Read the page: D, address: 5C, data (D
5) Set page: D, address: 5F, data: D
of the adjusting remote commander.
6) Set page: 0, address: 01, data: 01.
CH1
CH2
CH1
2V
CH2
5-40
VTR stop
Color bar signal
CH1: VC-197 board CN802 pin 6
(SYNC)
CH2: VC-197 board CN802 pin 8
(SRT)
Oscilloscope
D
5C, 55
T=6.9 ± 0.1µsec (NTSC)
T=8.40 ± 0.1µsec (PAL)
).
5C
and press the PAUSE button
5C
H
Enlarged
T
Fig. 5-3-28.