Date: 10/02/98 R762518
20
R762518
GREEN Convergence module
Convergence DRIVER module
R7625128
switched with the " vertical switch pulse " for a split of top and bottom.
The TK (
T
op
K
eystone) and BK (
B
ottom
K
eystone) signals are adjusted in IC14. Since
there is a correction per colour the different outputs of the digital potentiometers are
gathered per colour and will be added to the other corrections in the "summing
amplifiers".
Midline Corrections.
For the vertical and horizontal midline skew and bow corrections, the non-modulated
waveforms HP- / + , HS+ / - are adjusted in amplitude with IC42 and simultaneously
applied to the vertical and horizontal convergence coils of the three crt's.
Corner convergence.
The four corners are further divided (split) into 4 zones. The generation of the
convergence signals for the corners is similar for these four corners. The only difference
is the clamping or switching period. A split top / bottom is realised with a MUXDMUX
switcher and a left / right split with fast switching clamping transistors.
We limit the explanation to one corner and one zone
(Zone 1)
.
Zone 1 is the cross section of the extreme left vertical axis and the extreme top
horizontal axis. We need to start with a Horizontal Parabola (=extreme left vertical axis)
modulated on Vertical Parabola (= extreme top horizontal axis). This signal is called
HPVP'
in sheet 5. The clamping transistor Q16 clamps this signal during the second
half of the horizontal scan and then the signal is called
Z1+Z20
. This signal is now split
into top / bottom (Z1 and Z20) by the MUXDMUX IC12 (see sheet 4). Z1 and Z20 are
now prepared for the digital potentiometer IC35 by the buffer - OPAMP IC37 to get
Z1+
and
Z1-
(same signal with opposite polarity). These signals are then adjusted in IC35
and used for red and blue. The outputs are added in the summing amplifier to the rest
of the corrections. (
Geometry
and
Axis
).
Summing amplifiers.
All the corrections for the horizontal convergence coils are added per colour and
amplified with an MC34081. These OPAMP's are supplied with + / - 12V and since the
non-inverting input is at ground level, the average output of these OPAMPs is around
zero volts. This is required by the output power amplifiers for a balanced load of the
(complementary) output stage.
Technical description
Summary of Contents for GRAPHICS 1209S
Page 4: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SAFETY NOTICE...
Page 9: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC GENERAL INFORMATION...
Page 28: ...BARCO PROJECTION SYSTEMS GRAPHICS 1209S 90 00972 230V AC 90 00977 120V AC SERVICE SHEETS...
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