Servo And Rf System Adjustment; Cap Fg Duty Adjustment (Vc-227 Board); T Reel Fg Duty Adjustment (Vc-227 Board) - Sony DCR-PC100 Service Manual

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 & LPF f adjustment
0 0
4. Switching position adjustment
5. AGC center level and APC & AEQ adjustment
6. PLL f & LPF f final adjustment
0 0

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
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
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 & LPF f Adjustment (VC-227 board)
0 0
Mode
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
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
5-45
Display data of page: 3, address: 03
Adjustment remote commander
C
17
00
VTR stop
Display data of page: 3, address: 03
Adjustment remote commander
C
1F, 20, 22, 47
Bit2, bit3 and bit6 are "0"
Error contents
PLL f , even channel is defective
0
PLL f , odd channel is defective
0
LPF f is defective
0
PLL f , final adjustment is defective
0
PLL f , final adjustment time-out
0