5-46
3-3.
SERVO AND RF SYSTEM ADJUSTMENT
Before perform the servo and RF system adjustments, check that
the specified value of “40.5 MHz / 54 MHz Origin Oscillation
Adjustment” of “CAMERA 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-264 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 fo & LPF fo Adjustment (VC-264 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
3
01
00
Set the data, and press PAUSE button.
3
3
01
30
Set the data, and press PAUSE button.
4
3
02
Check that the data changes to
“00” with in 5 sec. (Note)
5
3
03
Check that the data is “00”.
(Note)
6
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 2 to 5.
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”.)
Setting data
CE
C6
D2
C2
When the data of page: C, address: 21 is “CA”.
When the data of page: C, address: 21 is “CE”.
When the data of page: C, address: 21 is “C6”.
When the data of page: C, address: 21 is “D2”
Bit value of page: 3,
address: 03 data
bit 2 = 1 or bit 3 = 1
bit 4 = 1 or bit 5 = 1
bit 6 = 1
Error contents
PLL fo fine adjustment is defective
PLL fo adjustment is defective
LPF fo is defective
RadarW
RadarW
RadarW
RadarW
RadarW
RadarW
RadarW
RadarW
RadarW
RadarW
