5-45
3-3. SERVO AND RF SYSTEM ADJUSTMENT
Before perform the servo and RF system adjustments, check that
the specified value of “27 MHz Origin Oscillation Adjustment” of
“CAMERA SYSTEM ADJUSTMENT” is satisfied.
Adjusting Procedure:
1. Cap FG duty adjustment
2. T-reel FG duty adjustment
3. PLL f0 & LPF f0 adjustment
4. Switching position adjustment
5. AGC center level
6. APC & AEQ adjustment
7. PLL f0 & LPF f0 final adjustment
1. Cap FG Duty Adjustment (VC-242 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. T reel FG Duty Adjustment (VC-242 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:
Order Page
Address
Data Procedure
1 Close the cassette compartment
without inserting a cassette.
2 0 01 01 Set the data.
3 3 01 1C Set the data, and press PAUSE
button.
4 3 02 Check that the data changes in
the following order.
“1C” → “2C” → “00”
5 3 03 Check that the data is “00”.
(Note)
6 0 01 00 Set the data.
Note: If the data is “02”, adjustment has errors or the mechanism deck is
defective.
3. PLL f0 & LPF f0 Adjustment (VC-242 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, 29
Specified Value Bit2, bit3 and bit6 are “0”
Adjusting method:
Order Page
Address
Data Procedure
1 0 01 01 Set the data.
2 3 01 30 Set the data, and press PAUSE
button.
3 3 02 Check that the data changes to
“00”.
4 3 03 Check that the data is “00”.
(Note)
5 0 01 00 Set the data.
Note: If the data is other than “00”, 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 4 = 1 PLL f
0
even channel is defective
bit 5 = 1 PLL f
0
odd channel is defective
bit 6 = 1 LPF f
0
is defective
bit 3 = 1 PLL f
0
final adjustment is defective
bit 2 = 1 PLL f
0
final adjustment time-out
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