Servo And Rf System Adjustment; Cap Fg Duty Adjustment (Vc-270 Board); Pll F & Lpf F Adjustment (Vc-270 Board); Switching Position Adjustment (Vc-270 Board) - Sony Handycam DCR-PC115 Service Manual

3-3.

SERVO AND RF SYSTEM ADJUSTMENT

Before perform the servo and RF system adjustments, check that
the specified value of "40.5MHz/54MHz Origin Oscillation
Adjustment" of "CAMERA SYSTEM ADJUSTMENT" is satisfied.
Adjusting Procedure:
1. Cap FG duty adjustment
2. PLL f & LPF f adjustment
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3. Switching position adjustment`
4. AGC center level
5. APC & AEQ adjustment
6. PLL f & LPF f fine adjustment
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1. Cap FG Duty Adjustment (VC-270 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.
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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.
DCR-PC115/PC115E/PC120BT/PC120E
2. PLL f & LPF f Adjustment (VC-270 board)
0 0
Mode
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 C 21
3 3 01
4 3 01
5 3 02
6 3 03
7 0 01
Note: If it isn't satisfied, select page: C, address: 21, set the following
data, and press the PAUSE button, and repeat steps 3 to 6.
When the data of page: C, address: 21 is "CA". CE
When the data of page: C, address: 21 is "CE". C6
When the data of page: C, address: 21 is "C6".
When the data of page: C, address: 21 is "D2"
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".)
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
5-51
VTR stop
Display data of page: 3, address: 02,
03
Adjustment remote commander
C
1F, 20, 22, 29
Data of page: 3, address: 02 is "00".
Data of page: 3, address: 03 is "00".
Procedure
01 Set the data.
CA Set the data, and press PAUSE
button.
00 Set the data, and press PAUSE
button.
30 Set the data, and press PAUSE
button.
Check that the data changes to
"00" with in 5 sec. (Note)
Check that the data is "00".
(Note)
00 Set the data.
Setting data
D2
C2
Error contents
PLL f fine adjustment is defective
0
PLL f adjustment is defective
0
LPF f adjustment is defective
0
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