Sony GV-D200E, Service Manual

Page: 111 / 166

5-21
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 Procedure
1 Insert the SW/OL reference tape
and enter the VTR STOP mode.
2 0 01 01 Set the data.
3 3 21 Check that the data is “02”.
(Note1)
4 3 01 0D Set the data, and press PAUSE
button.
5 3 02 Check that the data changes to
“00”.
6 3 03 Check that the data is “00”.
(Note2)
7 C 10 Check that the data is other than
“EE”. (Note3)
8 0 01 00 Set the data.
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)
4. AGC Center Level and APC & AEQ Adjustment
4-1. Preparations before adjustments
Mode Recording
Signal Color bar
Note: Use a Hi8 MP tape.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 8 2A C8 Set the data.
3 Record the color bar signal for
three minutes.
4-2. AGC Center Level Adjustment (VC-250 Board)
Mode Playback
Signal Recorded signal at “Preparations
before adjustments”
Measurement Point Pin qh of CN933 (RF MON) (Note 1)
Ext. trigger: Pin
qd
of CN933 (DV RFSWP)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 1E
Specified Value The data of page: 3, address: 03 is “00”
Note 1:
Connect a 75
Ω
resistor between Pin qh and Pin 6 (GND) of CN933.
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”
2 0 01 01 Set the data.
3 2 2E 01 Set the data.
4 3 33 08 Set the data.
5 Confirm that the playback RF
signal is stable. (Fig. 5-3-5.)
6 3 01 23 Set the data, and press PAUSE button.
7 3 02 Check that the data is “00”.
8 3 03 Check that the data is “00”.
(Note2)
9 Perform “APC & AEQ Adjustment”.
Note 2:
If the data of page: 3, address: 03 is other than “00”, adjustment
has errors.
13.3 msec
PB RF signal is stable
Pin
qd
Pin
qh
Fig. 5-3-5.