Servo And Rf System Adjustments; Cap Fg Duty Adjustment (Vc-288 Board); Pll F & Lpf F Pre-Adjustment (Vc-288 Board) - Sony DCR-TRV940 Adjustment Manual

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3-3.

SERVO AND RF SYSTEM ADJUSTMENTS

Before perform the servo and RF system adjustments, check that
the specified values of "66MHz/54MHz Origin Oscillation Ad-
justment" of "1-3. CAMERA SYSTEM ADJUSTMENTS" is sat-
isfied.
Check that the data of page: 0, address: 10 is "00".
If not, select page: 0, address: 10, and set the data "00".
Adjusting Procedure:
1. CAP FG duty adjustment
2. PLL f & LPF f Pre-adjustment
0 0
3. Switching position adjustment
4. AGC center level and APC & AEQ adjustment
5. PLL f & LPF f final adjustment
0 0

1. CAP FG Duty Adjustment (VC-288 board)

RadarW RadarW RadarW
RadarW RadarW
Set the CAP FG signal duty cycle to 50% to establish an appropri-
ate capstan servo. If deviated, the uneven rotation of capstan and
noise can occur in the LP mode.
Mode VTR stop
Signal No signal
Measurement Point Displayed data of page: 3, address: 03
Measuring Instrument Adjusting remote commander
Adjustment Page C
Adjustment Address 16
Specified value The data of page: 3, address: 03 is
"00"
Note 1: Check that the data of page: 0, address: 10 is "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 2: If the data is "01", adjustment has errors or the mecha-
nism deck is defective.
Procedure
Close the cassette compart-
ment without inserting
cassette.
Press PAUSE button.
Check the data changes in
the following order
"1B" t "2B" t "00"
Check the data is "00". (Note 2)
DCR-TRV940/TRV940E/TRV950/TRV950E
2. PLL f & LPF f Pre-Adjustment (VC-288 board)
0 0
RadarW RadarW RadarW
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 21
3 3 01
4 3 02
5 3 03
6 0 01
Note 2: If check is NG, select page: C, address: 21, set the fol-
lowing data, and press the PAUSE button, and repeat steps
3 to 5.
When the data of page: C, address: 21 is "DC"
When the data of page: C, address: 21 is "E0"
When the data of page: C, address: 21 is "D8"
When the data of page: C, address: 21 is "E4"
The adjustment is defective, if the above procedure results in NG.
Note 3: If bit value of bit2, bit3, bit4, bit5 or bit6 is "1", adjust-
ment has errors. For the error contents, see the follow-
ing table. (For the bit values, refer to "6-4. SERVICE
MODE", "4-3. 3. Bit value discrimination".)
Bit value of page: 3,
address: 03 data
bit2 = 1 or bit 3 =1
bit4 = 1 or bit 5 =1
bit6 = 1
6-57
VTR stop
No signal
Displayed data of page: 3, address:
02 and 03
Adjusting remote commander
C
1F, 20, 22, 29
The data of page: 3, address: 02 is "00"
The data of page: 3, address: 03 is "00"
Procedure
01
DC Press PAUSE button.
30 Press PAUSE button.
Check the data changes to
"00" within 5 seconds.
(Note 2)
Check the data is "00".
(Note 2, 3)
00
Setting data
Error contents
PLL f fine adjustment is defective
0
PLL f adjustment is defective
0
LPF f adjustment is defective
0
E0
D8
E4
D4