Sony GV-D1000E - Digital Video Cassette Recorder, Service Manual

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5-17
GV-D1000/D1000E
3-4. SERVO AND RF SYSTEM ADJUSTMENT
Before perform the servo and RF system adjustments, check that
the specified value of “40.5MHz/54MHz Origin Oscillation
Adjustment” of “VIDEO SYSTEM ADJUSTMENT” is satisfied.
Adjusting Procedure:
1. Cap FG duty adjustment
2. PLL f
0
& LPF f
0
adjustment
3. Switching position adjustment`
4. AGC center level
5. APC & AEQ adjustment
6. PLL f
0
& LPF f
0
fine adjustment
1. Cap FG Duty Adjustment (VC-275 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.
Measurement Point Display data of page: 3, address: 03
Measuring Instrument Adjustment remote commander
Adjustment Page C
Adjustment Address 16
Specified Value 00
Adjusting method:
Order Page Address Data Procedure
1 Close the cassette compartment
without inserting a cassette.
2 0 01 01 Set the data.
3 3 01 1B Set the data, and press PAUSE
button.
4 3 02 Check that the data changes in
the following order.
“1B”
→
“2B”
→
“00”
5 3 03 Check that the data is “00”.
(Note)
6 0 01 00 Set the data.
Note: If the data is “01”, adjustment has errors or the mechanism deck is
defective.
2. PLL f
0
& LPF f
0
Adjustment (VC-275 board)
Mode VTR stop
Measurement Point Display data of page: 3, address: 02,
03
Measuring Instrument Adjustment remote commander
Adjustment Page C
Adjustment Address 1F, 20, 22, 29
Specified Value Data of page: 3, address: 02 is “00”.
Data of page: 3, address: 03 is “00”.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 C 21 CA Set the data, and press PAUSE
button.
3 3 01 00 Set the data, and press PAUSE
button.
4 3 01 30 Set the data, and press PAUSE
button.
5 3 02 Check that the data changes to
“00” with in 5 sec. (Note)
6 3 03 Check that the data is “00”.
(Note)
7 0 01 00 Set the data.
Note: If it isn’t satisfied, select page: C, address: 21, set the following
data, and press the PAUSE button, and repeat steps 3 to 6.
Setting data
When the data of page: C, address: 21 is “CA”. CE
When the data of page: C, address: 21 is “CE”. C6
When the data of page: C, address: 21 is “C6”. D2
When the data of page: C, address: 21 is “D2” C2
There are errors when it isn’t satisfied even if the above treatment is
done.
If bit2, bit3, bit4, bit5 or bit 6 of the data of page: 3, address: 03 is
“1”, 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”.)
Bit value of page: 3, Error contents
address: 03 data
bit 2 = 1 or bit 3 = 1 PLL f
0
fine adjustment is defective
bit 4 = 1 or bit 5 = 1 PLL f
0
adjustment is defective
bit 6 = 1 LPF f
0
adjustment is defective