Sony GV-A500E, Service Manual

Page: 99 / 127

5-40
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
Measurement point Pin
7
of CN802 (HDB) of VC-197
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 VTR stop
Signal Color bar signal
Measurement point CH1: VC-197 board CN802 pin
6
(SYNC)
CH2: VC-197 board CN802 pin
8
(SRT)
Measuring equipment Oscilloscope
Adjustment page D
Adjustment address 5C, 55
Specification T=6.9 ± 0.1
µ
sec (NTSC)
T=8.40 ± 0.1
µ
sec (PAL)
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
5C
).
5) Set page: D, address: 5F, data: D
5C
and press the PAUSE button
of the adjusting remote commander.
6) Set page: 0, address: 01, data: 01.
Fig. 5-3-28.
H
CH1
Enlarged
CH1
CH2
CH2
2V
T