Servo And Rf System Adjustments; Reel Fg Adjustment (Vc-273 Board); Cap Fg Duty Adjustment (Vc-273 Board) - Sony DCR-TRV140 Service Manual

DCR-TRV140/TRV140E/TRV140M
3-3.

SERVO AND RF SYSTEM ADJUSTMENTS

Before perform the servo and RF system adjustments, check that
the specified value of "27 MHz Origin Oscillation Adjustment" of
"3-4. VIDEO SYSTEM ADJUSTMENT" is satisfied.
Adjusting Procedure:
1. REEL FG adjustment
2. CAP FG duty adjustment
3. PLL f & LPF f Pre-adjustment
0 0
4. Switching position adjustment
5. AGC center level adjustment
6. APC & AEQ adjustment
7. PLL f & LPF f final adjustment
0 0

1. REEL FG Adjustment (VC-273 board)

Compensates the dispersion of the hall elements.
Mode
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Adjusting method:
Order Page Address Data
1
2 0 01
3 3 01
4 3 02
5 3 03
6 0 01
Note: If the data is other value, adjustment has errors.
For the error contents, see the following table.
Data
02, 03, 06, 07
08, 09, 0C, 0D
0A, 0B, 0E, 0F
RadarW RadarW RadarW
VTR stop
Displayed data of page: 3, address:
03
Adjusting remote commander
C
17, 30
The data of page: 3, address: 03 is
"00" or "01" or "04" or "05"
Procedure
Close the cassette compart-
ment without inserting
cassette.
01
1C Press PAUSE button.
Check the data changes to
"00".
Check the data is "00" or
"01" or "04" or "05". (Note)
00
Error contents
T REEL is defective
S REEL is defective
T REEL and S REEL are defective

2. CAP FG Duty Adjustment (VC-273 board)

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 playback mode.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Adjusting method:
Order Page Address Data
1
2 0 01
3 D 10
4 8 0A
5 8 2A
6
7 6 01
8 6 02
9 6 01
10
11 D 10
12 8 0A
13 8 2A
14 0 01
Note: If the data is not changes to "01" within 6 seconds, adjust-
ment has errors.
5-40
RadarW RadarW
RadarW RadarW RadarW
VTR playback
Arbitrary
Displayed data of page: 6, address: 02
Adjusting remote commander
F
64
The data of page: 6, address: 02 is
"01"
Procedure
Close the cassette compart-
ment without inserting
cassette.
01
12 Press PAUSE button.
FD Press PAUSE button.
C8 Press PAUSE button.
Press PLAY button of the
unit, and set to the playback
mode without cassette.
81 Press PAUSE button.
Check the data changes to
"01" within 6 seconds.
(Note)
00 Press PAUSE button.
Press STOP button of the unit.
00 Press PAUSE button.
FF Press PAUSE button.
00 Press PAUSE button.
00