Hi8 Rec L Level Adjustment (Vc-195 Board) (Ccd-Trv65/Trv65Pk/ Trv85/Trv93/Trv615/Trv815) - Sony CCD-TRV15 Service Manual

9. Hi8 REC L Level Adjustment (VC-195 board)
(CCD-TRV65/TRV65PK/TRV85/ TRV93/ TRV615/ TRV815)
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 !º of CN910 (REC RF)
Measurement Point
Measuring Instrument Oscilloscope
(20MHz BW LIMIT: OFF)
Adjustment Page F
Adjustment Address 5B to 64
Specified Value A = 10.1±0.6mV (NTSC)
Note 1: Do not insert a plug into the AUDIO (R) terminal.
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).
Adjusting method:
1) Insert Hi8 ME tape, set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: F, address: 5B, set data: FF, and press the PAUSE
button of the adjusting remote commander.
4) Select page: F, address: 65, set data: 00, and press the PAUSE
button of the adjusting remote commander.
5) Select page: F, address: 5C, change the data and set the REC
AFM signal level (A) to the specified value.
6) Press the PAUSE button of the adjusting remote commander.
7) Select page: F, address: 5C, read the data (D
8) Calculate the adjustment data (hexadecimal) from the following
equations (hexadecimal calculation), and input each adjustment
address. (Refer to Table 5-1-2. Hexadecimal-Decimal
conversion Table.)
Address: 5B D
Address: 5D D
Address: 5E D
Address: 5F D
Address: 60 D
Address: 61 D
Address: 62 D
Note: After setting each data, be sure to press the PAUSE button
of the adjusting remote commander.
).
5C
= D
5B 5C
= D – 0C
5D 5C
= D – 0C
5E 5C
= D + 12
5F 5C
= D + 12
60 5C
= D + 13
61 5C
= D + 13
62 5C
9) Write the following data in page: F, address: 63 to 64.
Address
63
64
Note: After setting each data, be sure to press the PAUSE button
of the adjusting remote commander.
10) Select page: 0, address: 01, and set data: 00.
11) Perform "REC C Current Adjustment".
5-52
Data
7C
78
Fig. 5-3-15.