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Sony TRINITRON GDM-1601 - Horizontal Deflection Output Circuit

Sony TRINITRON GDM-1601
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DBpin
®
t---V---I
~~
DB
pin
®
DBpin
0
DC
ICT
(T
/2)
Amplitudes
can be varied
pin
CD
by
RVT05
and
RVT06.
~~(
DC
ICT (2/2)
Amplitudes
can be varied
pin
0
by
RVT04
and
RVT01.
~~
DC
tC2
(T/2)
pin
CD
DCpin
@
DC
OT
collector
DC
02
collector
DC
03
collector
.~lL1
I I I
I I I
il_L
I I I
I I I
ill
The falling edge
~1J
I~1
can be
shifted
: I
_.1
by
the
output
1 I
of
ICT (2/2).
I 1 I
I I I
DC
04
collector
I I I
As
a result, the
m
~JJll
phase
of
pulses
-.J~~at
04
is
altered.
Fig.3-2
Waveforms on
"DB"
and
"DC"
Boards
3-3
3-4-4.
Horizontal Deflection Output Circuit
The
horizontal
predriver circuit
of
Q214
and
T202
boosts
the
horizontal
oscillator
output
from
the
DA
board
to
switch
output
transistor Q215
on
and off.
The
horizontal
deflection
yoke,
resonance
capacitor
C224,
and
damper
diode
D210
are
connected
to
the
collector
of
Q215,
and
+B voltage is supplied
to
horizontal
output
transformer
T203.
The
secondary
windings
of
the
HOT, via D213
and
D214,
produce
DC
voltages for
Q216
and
Q21 7 for
control
of
raster
centt'ring.
D211, D212,
C227,
and
C228 are con-
figured as a boot-strap circuit
with
the
primary
winding
to
increase
the
voltage at
the
collector
of
Q215 for
horizontal
size selection. (WIDE or NAR-
ROW
can be selected by a
jumper
wire.)
The
horizontal
deflection
yoke
current
flows
thru
"S"
correction
capacitor
C219
and
horizontallineari-
ty
coil (HLC) L203. Transistor
Q210
provides
DC
power
to
the
output
circuit,
thru
Q211
and
Q212,
that
is
modulated
with
the
vertical
period
parabolic
wave
to
correct
side pincushion distortion.
Q210
is
driven by IC20 I
(2/2)
and
the
output
at
the
collector
of
Q212
is
fed back
to
le20
I
(2/2)
for regulation.
At
le20
I
(2/2),
the
amplitude
adjusted V parabolic wave
is
fed
to
the positive
input
and
the
regulated V saw-
tooth
wave
with
specific DC bias is fed
to
the
nega-
tive
input.
RV203 (PIN-AMP) adjusts
the
amplitude
of
the
parabolic wave from
le20
I
(1/2)
for side pin-
cushion
correction,
and
RV202
(KEY)
varies
the
amplitude
and
polarity
of
the
sawtooth
wave
output
from
Q20
I
to
corn~ct
keystone
distortion.
De
bias
for
le20
I
(2/2)
is varied by
RV204
(H SIZE) and
changes
the
De
level at
the
emitter
of
Q212 for hori-
zontal
picture
size
adjustment.
Two vertical
period
waveforms,
the
parabolic wave
from Q207
and
the
sawtooth
wave from Q201 are
input
to
the
DA board at
pin
qj)
and
modulate
the
AFC voltage
to
allow
adjustment
of
side pincushion
distortion
balance, SIDE PIN BAL
RV206,
and
keystone
distortion
balance, KEY BAL RV201.

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