Vertical Deflection - Sony KDP-57XBR2 Training Manual

C5020
FROM R5072
C5041
R5069
AC VOLTAGE
R5068
DIVIDER IN
H OUT

Vertical Deflection

Figure 10-5 illustrates the vertical processing circuitry primarily created by VDSP IC512. Synchronization is
achieved by VS entering pin 22. Notice the ½ H signal entering at pin 16. Since this unit generates internal,
interlaced, horizontal scan, the vertical must be phase locked to start the odd and even scan in the proper
location. The parabolic pincushion correction waveform exits pin 11 and vertical drive is output at pin 1 as a
sawtooth.
Figure 10-6 shows the usual output design. An operational amplifier is used with negative feedback from the
deflection yoke return to maintain linear amplification of the drive signal. It is simple and works quite well. You
rarely see vertical linearity problems with this design. As with the pincushion circuit, the vertical circuit seems to
cause problems for many technicians.
R5058
R5063
D5014
Q5019
N
Q5014
R5061
Q5016
N
R5024
R5027
-12V
FROM IC6001
FIGURE 10-4 - H PROTECT / HP
10. RA-4/4A Deflection Circuit Troubleshooting
R5023
Q5009
R5020
P
Q5015
N
C5026
D5008
R5042
R5033
R5039
C5020
P
R5048
D BOARD
44
R5013
D5006
D5002
C5011
R5004
R5018
N
Q5006
R5030
CN5004
H.P.
H BLK
(HP)
TO
A BOARD
CN509
10.4TVP14
CN506 H
PROTECT
8
TO IC1009/PIN 3
A BOARD
C5002
9
7/17/02