Rec L Level Adjustment (Vc-214 Board) - Sony Handycam Vision CCD-TRV66E Service Manual

8. REC L Level Adjustment (VC-214 board)

Set the recording levels of the REC AFM signal and REC ATF signal.
If the level is too low, the audio S/N will deteriorated, tracking will
not be stable, or SP/LP will not be discriminated properly. If too
high, color beets will be produced on the self-recording / playback
image.
Mode VTR recording (SP mode)
Signal No signal
Pin 0 of CN910 (REC RF)
Measurement Point
Measuring Instrument Oscilloscope
(20 MHz BW LIMIT: OFF)
Adjustment Page F
Adjustment Address 7B to 84
Specified Value A=11.0 ± 0.7mV
Note: Do not insert any plug into the AUDIO (R) terminal.
Connection:
1) Remove C085 (0.01 µF, Pin !§ of IC202).
Note: After completing "REC L Level Adjustment" and "REC C
Current Adjustment", replace C085 with new parts (1-182-970-
11 CERAMIC CHIP 0.01 µF 10% 25V).
Preparations only for the model without REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to "1". (Refer to "4-3, 3. Bit value
discrimination" of "5-4. Service Mode").
3) Insert a tape, and set to recording mode. (Use the wireless
remote commander of 8mm VCR.)
Adjusting method:
1) Insert Hi8 ME tape, and set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: F, address: 7B, set data: 00, and press the PAUSE
button of the adjustment remote commander.
4) Select page: F, address: 85, set data: 00, and press the PAUSE
button of the adjustment remote commander.
5) Select page: F, address: 7C, change the data and set the REC
AFM signal level (A) to the specified value.
6) Press the PAUSE button of the adjustment remote commander.
7) Select page: F, address: 7C, read the data (D
8) Convert D to decimal notation, and obtain D
7C
5-4-1. "Hexadecimal-decimal conversion table" of "5-4. Service
Mode".)
9) Calculate the adjustment data (decimal) from the following
equations (decimal calculation), convert it to a hexadecimal
number, and input each adjustment address.
Address: 7B
Address: 7D
Address: 7E
Address: 7F
Address: 80
Address: 81
Address: 82
Note: After setting each data, be sure to press the PAUSE button of
the adjustment remote commander.
10) Write the following data (hexadecimal) in page: F, address: 83
to 84.
Address Data
83 96
84 96
Note: After setting each data, be sure to press the PAUSE button of
the adjustment remote commander.
11) Select page: 0, address: 01, and set data: 00.
12) Perform "REC C Current Adjustment".
).
7C
'. (Refer to Table
7C
D ' = D '
7B 7C
D ' = D '
7D 7C
D ' = D '
7E 7C
D ' = D ' –68
7F 7C
D ' = D ' –68
80 7C
D ' = D ' –68
81 7C
D ' = D ' –68
82 7C
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
2) of "Preparations only for the model without REC switch".
3) Press the PAUSE button of the adjustment remote commander.
4) Select page: 0, address: 01, and set data: 00.
VC-214 BOARD
13
24
0.67 µ sec
5-40
132 89
88
133
IC202
176 45
1 44
C085
12 1
48
IC001
37
25 36
Center of the luminace line width
Center of the luminace line width
Fig. 5-3-13.
A