Rec Y Current Adjustment (Vc-341 Board) - Sony CCD-TRV128 Service Manual

CCD-TRV128/TRV228/TRV228E/TRV328/TRV428/TRV428E

6. REC Y Current Adjustment (VC-341 board)

Adjust the Y FM signal recording current.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Note 2: Don't disconnect the DC power supply of camcoder dur-
ing the following adjustments.
When the following symptom occurs, reset the data of A
page to the values note down.
1) The power is shut off so that unit can not operate.
0.18 µsec
VTR recording (PLAY/EDIT mode)
No signal
REC RF (Pin 7 of CN007)
Oscilloscope
(20 MHz BW LIMIT: OFF)
C
1E, 1F
A = 235 ± 5 mVp-p (NTSC)
A = 280 ± 5 mVp-p (PAL)
A
Fig. 6-3-8
Adjusting method:
Order Page Address Data
1
2
3 0 01
4 C 14
5 A 10
6 7 10
7 A 1A
8 A 1A
9
10 3 92
11 3 01
12 C 1F
13 C 1F
14 C 1F
15 C 1E
16 3 01
17 3 92
18
19 A 1A
20 7 10
21 A 10
22 C 14
23 0 01
Note 3: Use the REC buttons of the adjustment remote com-
mander (with HOLD switch set in the OFF position).
6-34
Procedure
Close the cassette compartment
without inserting cassette.
Set to the VTR stop mode.
01
01 Press PAUSE button.
10 Press PAUSE button.
02 Press PAUSE button.
Note down the data.
Set the following data, and
press PAUSE button.
06: NTSC model
26: PAL model
Set to the VTR recording
mode. (Note 3)
10
41 Press PAUSE button.
Change the data and set the
REC Y signal level (A) to the
specified value.
Press PAUSE button.
Read the data, and this data is
named D .
1F
D Press PAUSE button.
1F
00 Press PAUSE button.
00
Set to the VTR stop mode.
Set data noted down at step 7,
and press PAUSE button.
E2 Press PAUSE button.
00 Press PAUSE button.
00 Press PAUSE button.
00