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Replacement of a Picture Tube in the B*120* series
projectors (Continued)
Procedure 2
Adaptation of the Deflection Switching module, follow the next procedure:
Image 14
Procedure 3
Adaptation Convergence module ONLY in the following configuration, follow the next
procedure: Front
BARCO ——————————————————— 13
Step
Action
1
The width of the projected picture of the picture tube
R762104-2, -5 and -6 is larger than its replacement picture
tube R762431-2, -5 and -6.
To enlarge the width of the projected picture for the
replacement part, short-circuit the corresponding WIDTH
coils on the Deflection Switching module.
ATTENTION: before proceeding to the short-circuit of the
respective WIDTH Coil, activate CONVERGENCE OFF in
the SERVICE-Menu to switch the Convergence adjust-
ments in their mid-position.
WIDTH Adjustment: adjust the WIDTH-Coils of the not
replaced picture tubes for equal picture Width.
WIDTH Coils
Red
Picture Tube
and Rear
Table
Step
Action
The adaptation of the module consists of a readjustment of
Pulse 2 (P802).
1
Connect an oscilloscope to resistor R885 (or emitter of
transistor Q804)
2
Adjust the potentiometer P802 for a pulse duration of the
Pulse 2 of 2.5us on emitter of transistor Q804.
WIDTH Coils
WIDTH Coils
Green
Blue
Picture Tube
Picture Tube
Ceiling
————————————— Projection Systems
Image
14
Image
15
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