Sony DCR-TRV230E Service Manual page 171

1. VCO Adjustment (PD-138/139 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 (HSY)
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
1 0 01 01
2 D A2
3 D A2
4 D A2
5
6
7
8 D A3 D
A3
9 0 01 00
Note2: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
Procedure
Set the data.
Change the data and set the VCO
frequency (f) to the specified value.
Press PAUSE button.
Read the data, and this data is named
D .
A2
Convert D to decimal notation,
A2
and obtain D '. (Note2)
A2
Calculate D ' using following
A3
equations (Decimal calculation)
[2.5 LCD TYPE SO (61k)]
When D ' 20
A2
D '= D '–20
A3 A2
When D '< 20
A2
D ' = 0
A3
[2.5 LCD TYPE SO (123k)]
When D ' 26
A2
D '=D ' – 26
A3 A2
When D ' < 26
A2
D '=0
A3
[3.0 LCD TYPE SH (123k)]
When D ' 28
A2
D '=D '– 28
A3 A2
When D ' < 28
A2
D '=0
A3
[3.5 LCD TYPE SO (123k)]
When D ' 9
A2
D '=D '–9
A3 A2
When D ' < 9
A2
D '=0
A3
Convert D ' to a hexadecimal
A3
number, and obtain D . (Note2)
A3
Set the data, and press PAUSE
button.
Set the data.
2. PSIG Gray Adjustment (PD-139 board)
(DCR-TRV230E/TRV235E/TRV325E/TRV330E/TRV530E)
Set the uniformity improvement signal to an appropriate level.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 D A7
3 D A7
4 0 01
5-30
VTR stop
No signal
Pin 4 of CN5502 (PSIG)
Oscilloscope
D
A7
A = 5.00 ± 0.1V
Procedure
01 Set the data.
Change the data and set the PSIG
signal level (A) to the specified value.
(The data should be "00" to "7F")
Press PAUSE button.
00 Set the data.
2H
Fig. 5-1-17.
A