Sony Handycam Vision CCD-TRV66E, Service Manual

Page: 107 / 166

5-25
2. VCO Adjustment (PD-105 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode VTR stop
Signal No signal
Measurement Point Pin
2
of CN5501 (VCO VOLTAGE)
Measuring Instrument Oscilloscope (DC range)
Adjustment Page E
Adjustment Address C2, D8
Specified Value A = 1.70
+0.03
V
–0.05
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 01, set data: 55, and press the PAUSE
button of the adjustment remote commander.
3) Select page: 6, address: 7D, and set data: 00.
4) Select page: E, address: D8, change the data and set the VCO
VOLTAGE (A) to the specified value.
5) Press the PAUSE button.
6) Select page: E, address: D8 and read the data (D
D8
).
7) Convert D
D8
to decimal notation, and obtain D
D8
'. (Refer to
Table 5-4-1. “Hexadecimal-decimal conversion table” of “5-4.
Service Mode”.)
8) Calculate D
C2
' using following equation (decimal calculation),
convert it to a hexadecimal number, and input to page : E,
address : C2.
D
C2
' = D
D8
' – 27
9) Press the PAUSE button.
10) Select page: 2, address: 01, set data: 00, and press the PAUSE
button.
11) Select page: 0, address: 01, and set data: 00.
3. D range Adjustment (PD-105 board)
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode VTR stop
Signal No signal
Measurement Point Pin
3
of CN5501 (VG)
External trigger : Pin
4
of CN5501
(PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page E
Adjustment Address D6
Specified Value A = 3.06 ± 0.05V
Note : Press the DISPLAY button and erase the screen indictors on the
LCD screen.
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 01, set data: 55, and press the PAUSE
button of the adjustment remote commander.
3) Select page: 6, address: 7D, and set data: 00.
4) Select page: E, address: D6, change the data and set the voltage
(A) between the reversed waveform pedestal and non-reversed
waveform pedestal to the specified value.
5) Press the PAUSE button.
6) Select page: 2, address: 01, set data: 00, and press the PAUSE
button.
7) Select page: 0, address: 01, and set data: 00.
A
2H
Pedestal
Pedestal
H
A
GND level
(0Vdc)
Fig. 5-1-17.
Fig. 5-1-18.