Servo And Rf System Adjustment; Cap Fg Duty Adjustment (Vc-245 Board); Pll F & Lpf F Adjustment (Vc-245 Board) - Sony DCR-PC4E Service Manual

3-3.

SERVO AND RF SYSTEM ADJUSTMENT

Before perform the servo and RF system adjustments, check that
the specified value of "36 MHz Origin Oscillation Adjustment" of
"CAMERA SYSTEM ADJUSTMENT" is satisfied.
Adjusting Procedure:
1. Cap FG duty adjustment
2. PLL f & LPF f adjustment
0 0
3. Switching position adjustment
4. AGC center level
5. APC & AEQ adjustment

1. Cap FG Duty Adjustment (VC-245 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
1
2 0 01 01
3 3 01 1B
4 3 02
5 3 03
6 0 01 00
Note: If the data is "01", adjustment has errors or the mechanism deck is
defective.
Procedure
Close the cassette compartment
without inserting a cassette.
Set the data.
Set the data, and press PAUSE
button.
Check that the data changes in
the following order.
"1B" → "2B" → "00"
Check that the data is "00".
(Note)
Set the data.
2. PLL f & LPF f Adjustment (VC-245 Board)
0 0
Mode
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 3 01
3 3 02
4 3 03
5 0 01
Note: If bit2, bit3, bit4 or bit6 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".)
Bit value of page: 3,
address: 03 data
bit 4 = 1
bit 6 = 1
bit 3 = 1
bit 2 = 1
5-43
VTR stop
Display data of page: 3, address: 03
Adjustment remote commander
C
1F, 20, 22, 29
Bit2, bit3, bit4 and bit6 are "0"
Procedure
01 Set the data.
30 Set the data, and press PAUSE
button.
Check that the data changes to
"00".
Check that bit2, bit3, bit4 and
bit6 are "0". (Note)
00 Set the data.
Error contents
PLL f is defective
0
LPF f is defective
0
PLL f final adjustment is defective
0
PLL f final adjustment time-out
0