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5-31
Fig. 5-1-16.
A
2H
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 = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
Note1:
NTSC model: DCR-TRV730/TRV828/TRV830
PAL model: DCR-TRV725E/TRV730E/TRV828E/ TRV830E
Note2:
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
’. (Note3)
6
Calculate D
A3
’ using following
equations (Decimal calculation)
[2.5 LCD TYPE SH (61k) NTSC]
When D
A2
’ 232
D
A3
’= D
A2
’+23
When D
A2
’> 232
D
A3
’= 255
[3.5 LCD TYPE SO (123k) NTSC]
When D
A2
’ 246
D
A3
’= D
A2
’+9
When D
A2
’> 246
D
A3
’= 255
[2.5 LCD TYPE SO (61k) PAL]
When D
A2
’ 20
D
A3
’= D
A2
’–20
When D
A2
’< 20
D
A3
’= 0
[2.5 LCD TYPE SO (123k) PAL]
When D
A2
’ 26
D
A3
’= D
A2
’–26
When D
A2
’< 26
D
A3
’= 0
[3.5 LCD TYPE SO (123k) PAL]
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.
Note3:
Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
2. PSIG Gray Adjustment (PD-139 board)
(DCR-TRV725E/TRV730E/TRV828/TRV828E/TRV830/
TRV830E)
Set the uniformity improvement signal to an appropriate level.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin
4
of CN5502 (PSIG)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
A7
Specified Value
A = 5.00 ± 0.1V
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
A7
Change the data and set the PSIG
signal level (A) to the specified
value.
(The data should be “00” to “7F”)
3
D
A7
Press PAUSE button.
4
0
01
00
Set the data.