Servo And Rf System Adjustments; Reel Fg Adjustment (Vc-235 Board); Pll F & Lpf F Pre-Adjustment (Vc-235 Board) - Sony DCR-TRV820 Service Manual

3-3.

SERVO AND RF SYSTEM ADJUSTMENTS

Before perform the servo and RF system adjustments, check that
the specified value of "27 MHz/36MHz Origin Oscillation Ad-
justment" of "3-4. VIDEO SYSTEM ADJUSTMENT" is satis-
fied.
Adjusting Procedure:
1. REEL FG adjustment
2. PLL f & LPF f Pre-adjustment
0 0
3. Switching position adjustment
4. AGC center level adjustment
5. APC & AEQ adjustment
6. PLL f & LPF f final adjustment
0 0
7. Hi8/standard 8 mm switching position adjustment
8. CAP FG offset adjustment

1. REEL FG Adjustment (VC-235 board)

Mode VTR stop
Measurement Point Display data of page: 3, address: 03
Measuring Instrument Adjustment remote commander
Adjustment Page C
Adjustment Address 17, 30
Bit values of bit 1 and bit 3
Specified Value
are "0"
Adjusting method:
1) Close the cassette compartment without loading a cassette and
complete loading.
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 to
"00".
5) Select page: 3, address: 03, and check that bit values of bit 1
and bit 3 are "0".
If bit value of bit 1 and bit 3 is "1", there are errors. For the
error contents, see the following table. (For the bit values, re-
fer to "5-4. SERVICE MODE", "4-3. 3. Bit value discrimina-
tion")
Bit value of page: 3, Error contents
address: 03
bit 3 = 1 S REEL is defective
bit 1 = 1 T REEL is defective
6) Select page: 0, address: 01, and set data: 00.
2. PLL f & LPF f Pre-adjustment (VC-235 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 bit values of bit2,
bit3 and bit6 are "0".
If bit value of bit 2, bit 3 or bit 6 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 discrimi-
nation")
Bit value of page: 3,
address: 03
bit 6 = 1
bit 3 = 1
bit 2 = 1
If bit value of bit 2 or bit 3 is "1", select page: C, address: 21,
set the following data, and press the PAUSE button, and re-
peat steps 2) to 4).
When the data of page: C, address: 21 is "CA"
When the data of page: C, address: 21 is "CE"
When the data of page: C, address: 21 is "C6"
When the data of page: C, address: 21 is "D2"
5) Select page: 0, address: 01, and set data: 00.
5-44
VTR stop
Display data of page: 3, address: 03
Adjustment remote commander
C
1F, 20, 22, 29
Bit values of bit 2, bit 3 and bit 6
are "0"
Error contents
LPF f adjustment is defective
0
PLL f , fine adjustment is defective
0
PLL f , fine adjustment is defective
0
Setting data
CE
C6
D2
C2