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Date: 06/02/98
R9000901
R9000908
GRAPHICS
Replacement of a picture tube
13
808S
Picture tube alignment
Before starting the alignment of the new picture tube, the projector must warm up for at least 15
minutes at a medium brightness and contrast.
1 or 2 picture
tubes replaced
projected picture of the
non-defective tube can be
used as reference
rotate the deflection yoke
until the Horizontal midline
is levelled - tighten the
gear clamp
apply an external crosshatch
pattern at 15 kHz or use the internal
crosshatch
Picture tube alignment
proceed to a quick
optical and
electrical focus
all picture tubes
replaced
apply an external crosshatch
pattern at 15 kHz or use the internal
crosshatch
rotate the deflection yoke
until the Horizontal midline
is levelled - tighten the
gear clamp
centre the picture on the
CRT faceplate (refer to
installation manual)
note: alignment of the
stigmators will change
again its position, if so,
realign raster centring
ç
proceed to the following
adjustments for each picture
tube separately
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Set the midpoint focusing
on 57 (see owner's manual)
and the Contrast on 80
move the focus unit slowly
for- or backwards for max
focusing in the middle of the
screen - tighten the gear
clamp and the centring
clamp