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5-3. REC AFM Current Adjustment (VC-341 Board)
Check the recording current level of the REC AFM signal.
If it is too low, the audio S/N will be deteriorated. If too high,
color beets will be produced on self recording/playback image.
Mode
VTR recording (PLAY/EDIT mode)
Signal
No signal
Measurement Point
REC RF (Pin 7 of CN007)
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment Page
C
Adjustment Address
25
Specified value
NTSC model
A = (REC chroma signal level) × 0.292
PAL model
A = (REC chroma signal level) × 0.309
Note 1: Check that the data of page: 0, address: 10 is "00".
Note 2: REC chroma signal level is noted down at step 9 of "REC
C Current Check"
Adjusting method:
Order Page Address Data
1
2
3
0
01
01
4
3
92
20
5
3
01
41
6
C
25
7
C
25
8
3
01
00
9
3
92
00
10
0
01
00
11
Note 3: Use the REC buttons of the adjustment remote com-
mander (with HOLD switch set in the OFF position).
A
Fig. 6-3-8
CCD-TRV138/TRV238E/TRV338/TRV438E
± 0.9 mVp-p (Note 1)
± 0.9 mVp-p (Note 1)
Procedure
Close the cassette compartment
without inserting cassette.
Set to the VTR recording
mode. (Note 3)
Press PAUSE button.
Change the data and set the
REC AFM signal level (A) to
the specified value.
Press PAUSE button.
Press PAUSE button.
Perform "Processing after
Completed Adjustment".
Center of the luminance line width
0.67 µsec
5-4. Processing after Completed Adjustment
Note: Check that the data of page: 0, address: 10 is "00".
Order Page Address Data
1
2
0
01
3
A
1A
4
7
10
5
A
10
6
C
14
7
0
01
6-34
Procedure
Set to the VTR stop mode.
01
Set data noted down at step 7
of "7-1. Preparations", and
press PAUSE button.
E2
Press PAUSE button.
00
Press PAUSE button.
00
Press PAUSE button.
00