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5-50
DCR-TRV738E/TRV740/TRV740E/TRV840
3. Switching Position Adjustment (VC-278 board)
To obtain normal playback waveform output during the Digital8
playback mode, adjust the switching position.
playback mode, adjust the switching position.
Mode
VTR playback
Signal
SW/OL reference tape (WR5-2D)
Measurement Point
Display data of page: 3, address: 03
Measuring Instrument
Adjustment remote commander
Adjustment Page
C
Adjustment Address
10, 11, 12, 13
Specified Value
00
Note1:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
Insert the SW/OL reference tape
and enter the VTR STOP mode.
and enter the VTR STOP mode.
2
0
01
01
Set the data.
3
C
10
EE
Set the data, and press PAUSE
button.
button.
4
3
21
Check that the data is “02”.
(Note2)
(Note2)
5
3
01
0D
Set the data, and press PAUSE
button.
button.
6
3
02
Check that the data changes to
“00” in the following order.
“0E”
“00” in the following order.
“0E”
→“29”→“0E”→“20”→“00”
7
3
03
Check that the data is “00”.
(Note3)
(Note3)
8
C
10
Check that the data is other than
“EE”. (Note3)
“EE”. (Note3)
9
0
01
00
Set the data.
Note2:
If the data of page: 3, address: 21 is “72”, the tape top being played.
After playing the tape for 1 to 2 seconds, stop it, perform step 5
and higher.
After playing the tape for 1 to 2 seconds, stop it, perform step 5
and higher.
Note3:
If the data is other than “00”, select page: C, address: 21, after
write down the data, set data: 10, and press the PAUSE button,
and repeat from step1.
There are errors when the data of page: 3, address: 03 is other than
“00” even if this treatment is done. Select page: C, address: 21, set
the data written down, and press the PAUSE button.
If bit 0 of the data is “1”, the A channel is defective. If bit 1 is “1”,
the B channel is defective. Contents of the defect is written into
page: C, addresses: 10 and 12. See the following table. (For the bit
values, refer to “5-4. SERVICE MODE”, “4-3. 3. Bit value
discrimination”. ) If bit 3 of the data is “1”,the tape end being
played, and adjustment has errors.
write down the data, set data: 10, and press the PAUSE button,
and repeat from step1.
There are errors when the data of page: 3, address: 03 is other than
“00” even if this treatment is done. Select page: C, address: 21, set
the data written down, and press the PAUSE button.
If bit 0 of the data is “1”, the A channel is defective. If bit 1 is “1”,
the B channel is defective. Contents of the defect is written into
page: C, addresses: 10 and 12. See the following table. (For the bit
values, refer to “5-4. SERVICE MODE”, “4-3. 3. Bit value
discrimination”. ) If bit 3 of the data is “1”,the tape end being
played, and adjustment has errors.
Note4:
If the data is “EE”, rewind the tape and repeat steps 1 to 7.
When the A channel is defective
Data of page: C,
Contents of defect
address: 10
EE
Writing into EEPROM (IC4502) is
defective
defective
E8
Adjustment data is out of range
E7
No data is returned from IC3301
When the B channel is defective
Data of page: C,
Contents of defect
address: 12
E8
Adjustment data is out of range
E7
No data is returned from IC3301
4. AGC Center Level and APC & AEQ Adjustment
Note:
The data of page: 0, address: 10 must be “00”.
Use a Hi8 MP tape.
Use a Hi8 MP tape.
4-1. Preparations before adjustments
Mode
Camera recording
Subject
Arbitrary
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
8
21
C8
Set the data.
3
Record the camera signal for three
minutes.
minutes.
4-2. AGC Center Level Adjustment (VC-278 board)
Mode
Playback
Signal
Recorded signal at “Preparations before
adjustments”
adjustments”
Measurement Point
Pin qh of CN1108 (RF MON) (Note 1)
Ext. trigger: Pin qd of CN1108 (RF
SWP)
Ext. trigger: Pin qd of CN1108 (RF
SWP)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
1E
Specified Value
The data of page: 3, address: 03 is “00”
Note1:
Connect a 75
Ω resistor between Pin qh and Pin w; (GND) of
CN1108.
75
75
Ω resistor (Parts code: 1-247-804-11)
Adjusting method:
Order Page Address Data
Procedure
1
Playback the recorded signal at
“Preparations before adjustments”
“Preparations before adjustments”
2
0
01
01
Set the data.
3
7
62
01
Set the data.
4
3
33
08
Set the data.
5
Confirm that the playback RF
signal is stable. (Fig. 5-3-4.)
signal is stable. (Fig. 5-3-4.)
6
3
01
23
Set the data, and press PAUSE
button.
button.
7
3
02
Check that the data is “00”.
8
3
03
Check that the data is “00”.
(Note2)
(Note2)
9
Perform “APC & AEQ Adjustment”.
Note2:
If the data of page: 3, address: 03 is other than “00”, adjustment
has errors.
has errors.
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