Read Sony CCD-TR648E / CCD-TR748E / CCD-TR848 Service Manual online
5-35
CCD-TR648E/TR748E/TR848
6. REC C/AFM Current Adjustment
6-1. Preparations
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
D
14
Write down the data.
3
D
14
Set the following data, and press
PAUSE button.
06 (NTSC), 26 (PAL)
PAUSE button.
06 (NTSC), 26 (PAL)
4
D
15
Write down the data.
5
D
15
Set the following data, and press
PAUSE button.
6D (NTSC), 6F (PAL)
PAUSE button.
6D (NTSC), 6F (PAL)
Note:
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.
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.
6-2. REC C Current Check (VC-272 board)
Check the recording current level of the REC Chroma signal. If it is
too low, chroma signal noise in played back picture will be increased.
If too high, Y signal noises will increase and white modulation noises
will be produced.
too low, chroma signal noise in played back picture will be increased.
If too high, Y signal noises will increase and white modulation noises
will be produced.
Mode
VTR recording (SP mode)
Signal
No signal
Measurement Point
REC RF (Pin 7 of CN713)
Measuring Instrument
Oscilloscope
(20 MHz BW LIMIT: OFF)
(20 MHz BW LIMIT: OFF)
Specified Value
A = 50.8 ± 3.0mV (NTSC)
A = 54.0 ± 3.0mV (PAL)
A = 54.0 ± 3.0mV (PAL)
Note1:
Insert a plug into the S VIDEO or the A/V jack.
Adjusting method:
Order Page Address Data
Procedure
1
Insert a tape, and set to VTR
recording mode. (Note2)
recording mode. (Note2)
2
0
01
01
Set the data.
3
2
01
41
Set the data, and press PAUSE
button.
button.
4
6
61
30
Set the data.
5
E
9F
Write down the data.
6
E
9F
05
Set the data, and press PAUSE
button.
button.
7
F
69
Write down the data.
8
F
69
00
Set the data, and press PAUSE
button.
button.
9
Check that the REC chroma signal
level (A) satisfies the specified
value, and write down the signal
level.
level (A) satisfies the specified
value, and write down the signal
level.
10
F
69
Set the data written down at step
7, and press PAUSE button.
7, and press PAUSE button.
11
E
9F
Set the data written down at step
5, and press PAUSE button.
5, and press PAUSE button.
12
6
61
10
Set the data.
13
2
01
00
Set the data, and press PAUSE
button.
button.
14
0
01
00
Set the data.
15
Perform “REC AFM Current
Adjustment” and “Processing after
completed adjustment”.
Adjustment” and “Processing after
completed adjustment”.
Note2:
Use the REC buttons of the adjustment remote commander (with
the HOLD switch set in the OFF position).
the HOLD switch set in the OFF position).
A
1.35
µ
sec
Center of the luminance line width
Fig. 5-3-9.
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