Rec Y Current Adjustment (Vc-251 Board) - Sony CCD-TR618 Service Manual

6. REC Y Current Adjustment (VC-251 board)

Adjust the Y FM signal recording current.
Mode VTR recording (SP mode)
Signal No signal
Measurement Point REC RF (Pin qg of CN713 or Pin qg
of CPC connector of FP-262 flexible)
Measuring Instrument Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment Page F
Adjustment Address 6A, 6B
Specified Value A=235 ± 5mV (NTSC)
A=280 ± 5mV (PAL)
Note1: Don't disconnect the DC power supply of the camcorder during
the following adjustments.
When the following symptom occurs, reset the data of D page to
the values written down.
1) The power is shut off so that unit cannot operate.
0.18 sec
Fig. 5-3-9.
Adjusting method:
Order Page Address Data
1
2
3
4
7
5
F9
6
7
8
9
10
11
12
A
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Note2: Use the REC buttons of the adjustment remote commander (with
Note3: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
5-44
Set to the stop mode.
0 01 01 Set the data.
D 14 Write down the data.
D 14 Set the following data, and press
PAUSE button.
06 (NTSC), 26 (PAL)
D 15 Write down the data.
D 15 Set the following data, and press
PAUSE button.
6D (NTSC), 6F (PAL)
Set to VTR recording mode.
(Note2)
E FB Write down the data.
E FB 06 Set the data, and press PAUSE
button.
F 71 Write down the data.
F 71 00 Set the data, and press PAUSE
button.
2 01 41 Set the data, and press PAUSE
button.
6 63 01 Set the data.
F 6B Change the data and set the Y
signal level (A) to the specified
value, and press PAUSE button.
F 6B Read the data, and this data is
named D
F 6A D Set the data, and press PAUSE
6B
button.
Convert D
and obtain D
Calculate D
equations (Decimal calculation)
When D
When D
Convert D
number, and obtain D
7 F9 D Set the data, and press PAUSE
F9
button.
6 63 00 Set the data.
2 01 00 Set the data, and press PAUSE
button.
F 71 Set the data written down at step
10, and press PAUSE button.
E FB Set the data written down at step
8, and press PAUSE button.
D 14 Set the data written down at step
3, and press PAUSE button.
D 15 Set the data written down at step
5, and press PAUSE button.
0 01 00 Set the data.
the HOLD switch set in the OFF position).
Ver 1.1 2001. 04
Procedure
.
6B
to decimal notation,
6B
'. (Note3)
6B
' using following
F9
' 243
6B
D ' = D ' + 12
F9 6B
'> 243
6B
D ' = 255
F9
' to a hexadecimal
F9
. (Note3)
F9