System Control System Adjustments; Servo System Adjustments; Cap Fg Offset Adjustment (Vc-341 Board); Switching Position Adjustment (Vc-341 Board) - Sony CCD-TRV128 Service Manual

CCD-TRV128/TRV228/TRV228E/TRV328/TRV428/TRV428E

3-2. SYSTEM CONTROL SYSTEM ADJUSTMENTS

1. Initialization of 8, A, C, D, E, F, 1F Page Data
If the 8, A, C, D, E, F, 1F page data is erased due to some reason,
perform "1-2. INITIALIZATION OF 8, A, C, D, E, F, 1F PAGE
DATA" of "6-1. CAMERA SECTION ADJUSTMENTS".

3-3. SERVO SYSTEM ADJUSTMENTS

Before perform the servo system adjustments, check that the speci-
fied values of "28 MHz Origin Oscillation Adjustment" of "VIDEO
SYSTEM ADJUSTMENTS" is satisfied.
Check that the data of page: 0, address: 10 is "00".
If not, select page: 0, address: 10, and set the data "00".

1. CAP FG Offset Adjustment (VC-341 board)

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Set the CAP FG signal duty cycle to 50% to establish an appropri-
ate capstan servo. If deviated, the uneven rotation of capstan and
noise can occur in the playback mode.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1
2 0 01
3 3 01
4 3 02
5 3 03
6 0 01
Note 2: If the data is other than "00", adjustment has errors.
For the error contents, see the following table.
Data of page: 3,
Error contents
address: 03
01 Adjustment time out
Mechanism mode error (For example, the
10 adjustment is performed in the mode except
for VTR stop mode.)
VTR stop (PLAY/EDIT mode)
No signal
Displayed data of page: 3, address: 03
Adjusting remote commander
C
18
The data of page: 3, address: 03 is "00"
Procedure
Close the cassette compartment
without inserting cassette.
01
81 Press PAUSE button.
Check the data changes to
"00".
Check that the data is "00".
(Note 2)
00

2. Switching Position Adjustment (VC-341 board)

If deviated in this case cause switching noise or jitter on the played
back screen.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1 0 01
2 3 92
3 C 16
4 C 16
5 C 17
6 C 17
7 3 92
8 0 01
Note 2: For the bit values, refer to "6-4. SERVICE MODE", "4-
3. 3. Bit Value Discrimination".
CH1
CH2
Enlargement
CH1
CH2
6-30
VTR playback
Alignment tape:
For tracking adjustment
(WR5-1NP(NTSC))
(WR5-1CP(PAL))
CH1: SWP (Pin 5 of CN007)
CH2: PB RF (Pin 9 of CN007)
Oscilloscope
C
16, 17
t1 = 0 ± 10 µsec
Procedure
01
Set the bit value of bit 2 to "1",
and press PAUSE button.
(Note 2)
Change the data and minimize
"t1". (Coarse adjustment)
Press PAUSE button.
Change the data and adjust so
that the switching position (t1)
becomes specified value. (Fine
adjustment)
Press PAUSE button.
Set the bit value of bit 2 to "0",
and press PAUSE button.
(Note 2)
00
t1=0 ± 10 µsec
Fig. 6-3-3