5-45
3-3.
SERVO AND RF SYSTEM ADJUSTMENT
Before perform the servo and RF system adjustments, check that
the specified value of “54MHz/66MHz Origin Oscillation
Adjustment” of “CAMERA SYSTEM ADJUSTMENT” is satisfied.
Adjusting Procedure:
1.
Cap FG duty adjustment
2.
T-reel FG duty adjustment
3.
PLL f
0
& LPF f
0
adjustment
4.
Switching position adjustment
5.
AGC center level and APC & AEQ adjustment
6.
PLL f
0
& LPF f
0
final adjustment
1. Cap FG Duty Adjustment (VC-227 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:
1)
Close the cassette compartment without inserting a cassette.
2)
Select page: 0, address: 01, and set data: 01.
3)
Select page: 3, address: 01, set data: 1B, and press the PAUSE
button of the adjustment remote commander.
4)
Select page: 3, address: 02, and check that the data changes
starting from “1B” to “2B” to “00” in this order.
5)
Select page: 3, address: 03, and check that the data is “00”.
Note:
If the data of page: 3, address: 03 is “01”, adjustment has errors
or the mechanism deck is defective.
6)
Select page: 0, address: 01, and set data: 00.
2. T reel FG Duty Adjustment (VC-227 board)
Adjust the take-up reel FG signal duty cycle to an appropriate value
so that the correct T-reel FG signal is obtained.
Measurement Point
Display data of page: 3, address: 03
Measuring Instrument
Adjustment remote commander
Adjustment Page
C
Adjustment Address
17
Specified Value
00
Adjusting method:
1)
Close the cassette compartment without inserting a cassette.
2)
Select page: 0, address: 01, and set data: 01.
3)
Select page: 3, address: 01, set data: 1C, and press the PAUSE
button of the adjustment remote commander.
4)
Select page: 3, address: 02, and check that the data changes
starting from “1C” to “2C” to “00” in this order.
5)
Select page: 3, address: 03, and check that the data is “00”.
Note:
If the data of page: 3, address: 03 is “02”, adjustment has errors
or the mechanism deck is defective.
6)
Select page: 0, address: 01, and set data: 00.
3. PLL f
0
& LPF f
0
Adjustment (VC-227 board)
Mode
VTR stop
Measurement Point
Display data of page: 3, address: 03
Measuring Instrument
Adjustment remote commander
Adjustment Page
C
Adjustment Address
1F, 20, 22, 47
Specified Value
Bit2, bit3 and bit6 are “0”
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2)
Select page: 3, address: 01, set data: 30, and press the PAUSE
button of the adjustment remote commander.
3)
Select page: 3, address: 02, and check that the data changes to
“00”.
4)
Select page: 3, address: 03, and check that bit2, bit3 and bit 6
of the data are “0”.
Note:
If bit2, bit3 or bit 6 of the data 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”.)
5)
Select page: 0, address: 01, and set data: 00.
Bit value of page: 3,
address: 03 data
bit 4 = 1
bit 5 = 1
bit 6 = 1
bit 3 = 1
bit 2 = 1
Error contents
PLL f
0
, even channel is defective
PLL f
0
, odd channel is defective
LPF f
0
is defective
PLL f
0
, final adjustment is defective
PLL f
0
, final adjustment time-out
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