Rec C/Afm Current Adjustment; Preparations; Rec C Current Check (Vc-251 Board) - Sony CCD-TR618 Service Manual

7. REC C/AFM Current Adjustment

7-1. Preparations

Order Page Address Data
1 0 01 01
2 D 14
3 D 14
4 D 15
5 D 15
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.
Procedure
Set the data.
Write down the data.
Set the following data, and press
PAUSE button.
06 (NTSC), 26 (PAL)
Write down the data.
Set the following data, and press
PAUSE button.
6D (NTSC), 6F (PAL)

7-2. REC C Current Check (VC-251 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.
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Adjusting method:
Order Page Address Data
1
2 0 01
3 2 01
4 6 61
5 E FB
6 E FB
7 F 71
8 F 71
9
10 F 71
11 E FB
12 6 61
13 2 01
14 0 01
15
Note: Use the REC buttons of the adjustment remote commander (with
the HOLD switch set in the OFF position).
A
5-45
VTR recording (SP mode)
No signal
REC RF (Pin qg of CN713 or Pin qg
of CPC connector of FP-262 flexible)
Oscilloscope
(20 MHz BW LIMIT: OFF)
A=50.8 ± 3.0mV (NTSC)
A=54.0 ± 3.0mV (PAL)
Procedure
Insert a Hi8 ME tape, and set to
VTR recording mode. (Note)
01 Set the data.
41 Set the data, and press PAUSE
button.
30 Set the data.
Write down the data.
05 Set the data, and press PAUSE
button.
Write down the data.
00 Set the data, and press PAUSE
button.
Check that the REC chroma
signal level (A) satisfies the
specified value, and write down
the signal level.
Set the data written down at step
7, and press PAUSE button.
Set the data written down at step
5, and press PAUSE button.
10 Set the data.
00 Set the data, and press PAUSE
button.
00 Set the data.
Perform "REC AFM Current
Adjustment" and "Processing
after completed adjustment".
Center of the luminance line width
1.35 sec
Fig. 5-3-10.