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5-53
DCR-TRV738E/TRV740/TRV740E/TRV840
7. CAP FG Duty Adjustment (VC-278 board)
Set the Cap FG signal duty cycle to 50% to establish an appropriate
capstan servo. If deviated, the uneven rotation of capstan and noise
can occur in the Hi8/Standard8 LP mode.
capstan servo. If deviated, the uneven rotation of capstan and noise
can occur in the Hi8/Standard8 LP mode.
Mode
Playback
Signal
Hi8/standard 8 alignment tape :
For checking operation
(WR5-5NSP (NTSC), WR5-5CSP (PAL) )
For checking operation
(WR5-5NSP (NTSC), WR5-5CSP (PAL) )
Measurement Point
Pin qg of CN1108 (CAP FG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
16
Specified value
Duty = 50 ± 1 %
Note1:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
Set to the playback mode.
2
0
01
01
Set the data.
3
3
01
00
Set the data, and press PAUSE
button.
button.
4
3
01
81
Set the data, and press PAUSE
button.
button.
5
3
02
Check that the data changes from
“81” to “00”.
“81” to “00”.
6
3
03
Check that the data is “00”.
(Note2)
(Note2)
7
Check that Duty of CAP FG signal
satisfies the specified value. If not,
repeat steps 3 to 7.
satisfies the specified value. If not,
repeat steps 3 to 7.
8
0
01
00
Set the data.
Note2:
If the data of page: 3, address: 03 is other than “00”, there are
errors. For the error contents, see the following table. (For the bit
values, refer to “5-4. SERVICE MODE”, “4-3. 3. Bit value
discrimination”.)
errors. For the error contents, see the following table. (For the bit
values, refer to “5-4. SERVICE MODE”, “4-3. 3. Bit value
discrimination”.)
Bit value of page: 3,
Error contents
address: 03
bit 0 = 1
Adjustment time-out
bit 1 = 1
Hi8/Standard8 mode wasn’t set up.
Fig. 5-3-6.
A
B
Duty = A/B
×
100 [%]
Center of movement
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