Rec C Current Adjustment (Vc-195 Board) - Sony Handycam CCD-TR57 Service Manual

11. REC C Current Adjustment (VC-195 board)

Set the recording current levels of the REC Chroma signal. If it is
too low, chroma signal noise in played back picture will increased.
If too high, Y signal noises will increase and white modulation noises
will be produced.
Mode VTR recording (SP mode)
Signal No signal
Pin !º of CN910 (REC RF)
Measurement Point
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 65
Specified Value Hi8 model :
A = 34.6±1.2mV
Standard8 model :
A = 30.9±1.1mV
Note 1: HI8 model:
Standard8 model:
Connection:
1) Remove C085 (0.01µF, Pin !§ of IC202).
Note: After completing "REC L Level Adjustment" and "REC C
Current Adjustment", replace C085 with new parts (1-162-
970-11 CERAMIC CHIP 0.01µF 10% 25V).
2) Connect Pin 1 of IC001 and GND with a 0.01F capacitor.
0.01µF capacitor: 1-101-004-00
Preparations only for the model without REC switch:
1) Select page: 0, address: 01, and set data: 01.
3) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to "1". (Refer to "3. Bit value discrimination" of
"3-1-8. Service Mode").
4) Select page: D, address: 15, after memorizing the data , set the
bit value of bit7 to "0".
5) Turn off the HOLD switch of the adjusting remote commander,
and press the REC buttons and set to recording mode.
Adjusting method:
1) Insert a tape, set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: 3, address: 01, set data: 41, and press the PAUSE
button of the adjusting remote commander.
4) Select page: 2, address: 61, and set data: 30.
5) Select page: F, address: 65, change the data and set the REC
chroma signal level (A) to the specified value.
6) Press the PAUSE button of the adjusting remote commander.
7) Select page: 2, address: 61, and set data: 10.
8) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
9) Select page: 0, address: 01, and set data: 00.
CCD-TR917/ TR940/ TR940PK
CCD-TR57/ TR67/ TR87/
TR413PK/ TR414PK
Processing after completed adjustment: only for the model without
REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, and set the data memorized at step
3) of "Preparations only for the model without REC switch".
3) Press the PAUSE button of the adjusting remote commander.
4) Select page: D, address: 15, and set the data memorized at step
4) of "Preparations only for the model without REC switch".
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: 0, address: 01, and set data: 00.
5-45
Center of the luminance line width
1.35 µ sec
Fig. 5-3-17.
A