Sony DCR-TRV15E, Руководство по обслуживанию

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5-31
2. VCO Adjustment (PD-143 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode VTR stop
Signal No signal
Measurement Point Pin
8
of CN5502 (XHD OUT)
Measuring Instrument Frequency counter
Adjustment Page D
Adjustment Address A2, A3
Specified Value f = 15625 ± 30Hz
Note1:
Refer to “LCD Type Check” for the discrimination of the LCD
type.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 D A2 Change the data and set the VCO
frequency (f) to the specified value.
3 D A2 Press PAUSE button.
4 D A2 Read the data, and this data is
named D
A2
.
5 Convert D
A2
to decimal notation,
and obtain D
A2
’. (Note2)
6 Calculate D
A3
’ using following
equations (Decimal calculation)
[2.5 LCD TYPE]
When D
A2
’ 25
D
A3
’ =D
A2
’–25
When D
A2
’ < 25
D
A3
’ = 0
[3.5 LCD TYPE]
When D
A2
’ 9
D
A3
’ =D
A2
’–9
When D
A2
’ < 9
D
A3
’ = 0
7 Convert D
A3
’ to a hexadecimal
number, and obtain D
A3
. (Note2)
8 D A3 D
A3
Set the data, and press PAUSE
button.
9 0 01 00 Set the data.
Note2: Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
3. RGB AMP Adjustment (PD-143 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 CN5502 (PANEL VG)
External trigger: Pin 4 of CN5502
(PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address A5
Specified Value A = 3.59 ± 0.05V (LCD TYPE S)
A = 3.20 ± 0.05V (LCD TYPE C)
Note:
Refer to “LCD Type Check” for the discrimination of the LCD type.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 D A5 Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to the
specified value.
(The data should be “00” to “3F”)
3 D A5 Press PAUSE button.
4 0 01 00 Set the data.
Fig. 5-1-17.
Pedestal
Pedestal
A
2H