Sony GV-D200 Service Manual page 56

3. Switching Position Adjustment (VC-250 Board)
To obtain normal playback waveform output during the Digital8
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
Adjusting method:
Order Page Address Data
1
2 0 01 01
3 3 21
4 3 01 0D
5 3 02
6 3 03
7 C 10
8 0 01 00
Note 1: If the data of page: 3, address: 21 is "72", the tape top being played.
After playing the tape for 1 to 2 seconds, perform step 4 and higher.
Note 2: 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". )
Note 3: 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
E8 Adjustment data is out of range
E7 No data is returned from IC3301
(CAIN)
When the B channel is defective
Data of page:C, Contents of defect
address:12
EE Writing into EEPROM (IC4502) is
defective
E8 Adjustment data is out of range
E7 No data is returned from IC3301
(CAIN)
Procedure
Insert the SW/OL reference tape
and enter the VTR STOP mode.
Set the data.
Check that the data is "02".
(Note1)
Set the data, and press PAUSE
button.
Check that the data changes to
"00".
Check that the data is "00".
(Note2)
Check that the data is other than
"EE". (Note3)
Set the data.
4. AGC Center Level and APC & AEQ Adjustment
4-1. Preparations before adjustments
Mode
Signal
Note: Use a Hi8 MP tape.
Adjusting method:
Order Page Address Data
1 0 01
2 8 2A
3
4-2. AGC Center Level Adjustment (VC-250 Board)
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note 1: Connect a 75Ω resistor between Pin qh and Pin 6 (GND) of CN933.
75Ω resistor (Parts code: 1-247-804-11)
Adjusting method:
Order Page Address Data
1
2 0 01
3 2 2E
4 3 33
5
6 3 01
7 3 02
8 3 03
9
Note 2: If the data of page: 3, address: 03 is other than "00", adjustment
has errors.
Pin qh
Pin qd
5-21
Recording
Color bar
Procedure
01 Set the data.
C8 Set the data.
Record the color bar signal for
three minutes.
Playback
Recorded signal at "Preparations
before adjustments"
Pin qh of CN933 (RF MON) (Note 1)
Ext. trigger: Pin qd of CN933 (DV RFSWP)
Oscilloscope
C
1E
The data of page: 3, address: 03 is "00"
Procedure
Playback the recorded signal at
"Preparations before adjustments"
01 Set the data.
01 Set the data.
08 Set the data.
Confirm that the playback RF
signal is stable. (Fig. 5-3-5.)
23 Set the data, and press PAUSE button.
Check that the data is "00".
Check that the data is "00".
(Note2)
Perform "APC & AEQ Adjustment".
PB RF signal is stable
13.3 msec
Fig. 5-3-5.