Barco R9002380 Manuale utente
Date: 15/05/2000
Replacement of a picture tube
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R9002380
R9002389
Replacement of a picture tube
WARNING: CRT HANDLING
The picture tube encloses a high vacuum and care must be taken not to bump or
to scratch the picture tube as this may cause the tube to implode resulting in
personal injury and property damage. Shatterproof goggles must always be worn
by individuals while handling the CRT or installing it in the projector.
Do not handle the CRT by the neck.
WARNING
TURN OFF THE PROJECTOR AND UNPLUG THE POWER CORD
BEFORE PROCEEDING TO THE REPLACEMENT OF A PICTURE TUBE
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Replacement of a picture tube
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I. Removing and disassembling the defective picture tube.
A. Getting Access to the picture tube
1. Remove the top cover of the projector (please refer to the projector installation manual).
2. Loosen the two locking screws of the module frame.
3. Open the module frame by pivoting it towards the front of projector.
Locking screws
Module frame
Module frame
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B. Electrical disconnection
4. EHT lead disconnection
Pull out the EHT lead of the defective picture tube from the EHT splitter.
5. Picture tube drive module removal (see picture above)
Disconnect the ground connection of the neck screening
(A) by separating male from the female bullet terminal (B).
Disconnect the CRT ground plug (C) of the defective
picture tube.
Disconnect ground connection (D) of the CRT drive module
by removing screw (E) on main frame.
Loosen the gear clamp of the Picture tube drive module
(F).
Carefully pull the module (D) back to slide the CRT socket
off from the end of the CRT.
Important: Deflection Unit can be slid off from the CRT
neck after the picture tube has been mechanical discon-
nected from main frame. Therefore, electrical disconnec-
tion of the deflection block is not necessary.
EHT lead
Red Green Blue
To pull out
To open
To secure
B
A
EHT lead
C
C
F
E
D
Drive module removed
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C. CRT Disassembly
clips
clips
7. Removing the CRT neck components
- Loosen the gear clamp (A) of the stigmator
magnets unit.
- Loosen the gear clamp (C) of the deflection unit.
- Slide the stigmator off from the end of the CRT.
- Slide the mu-metal screening (B) off the end of
the CRT.
- Slide the deflection unit off from the end of the
CRT.
- Remove picture tube from projector.
6. Removing the Picture tube
- Disconnect the temperature sensor (B) on top
of the picture tube heatsink by removing
fixation screw.
- Support the CRT unit by hand.
- Remove the two fixation bolts (A), holding the
CRT unit to main frame.
- To remove the picture tube, tilt the CRT a little
downwards and pull the CRT face out of the
clips (B), located at the bottom of the main
frame.
A
B
C
B
A
B
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II. Installing of the new picture tube.
A. Preparation of the new picture tube.
1. Remove the picture tube ground unit from the defective picture tube and mount it on the new picture tube, as
illustrated in pictures above.
B. Mounting the components on the neck of the picture tube.
2. Put the picture tube on its place in the projector and consecutively slide the deflection unit, mu-metal screening
on the neck of the picture tube. Push the deflection unit fully against the tube and slide the mu-metal below the
deflection unit gear ring. Secure the position of the unit by tightening the gear clamp screw (see pictures on
page 4).
3. Slide the Stigmator unit on the neck of the picture tube. Secure the position of the unit by tightening the gear
clamp screw (see pictures on page 4).
C. Installing picture tube in main frame (see pictures on page 4)
4. Tilt the picture tube a little downwards and place it correctly on its two clips. Push the bottom of the tube face
into the two clips.
5. Tilt up the picture tube until the face fits the picture tube block and secure the postion with two bolts.
6. Reinstall the temperature sensor on top of the picture tube heatsink.
D. Electrical connection (see pictures on page 3)
7. Plug in the EHT lead of the installed picture tube on the EHT splitter and lock the connector.
8. Push the CRT Socket module on the picture tube.
9. Secure the gear clamp of the Picture tube drive module.
10. Reconnect the CRT ground plug.
11. Reconnect the ground connection of the mu_metal sreening.
Top view Bottom view
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III. Picture tube alignment
Introduction 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.
If a set of three tubes must be replaced, it is advisable to start with the
replacement of the red and blue tubes first, and using the green as the
reference.
Proceed then with the replacement of the green tube, using now one of the
other colors tubes as the reference.
Apply an external crosshatch pattern at 15 kHz or use the internal crosshatch.
Align the optical and electrical focus of the tube.
Rotate the deflection yoke until the horizontal lines of the crosshatch are
levelled on the screen.
Tighten now carefully the screw of the gear clamp of the deflection yoke.
Center the picture on the CRT faceplate (refer to explanation 'Raster
centering').
Note: alignment of the stigmators will change again its position, if so, realign
raster centering.
A. Replacement of a complete
set of three tubes
- Adjust the 2-pole and 4-pole
magnetic rings on the CRT neck in
their neutral position (see illustra-
tion on next page).
- Select a source that will generate
a field of small dots and
crosshairs.
Preparation
- Proceed to quick optical lens focusing (please refer to the projector
installation manual).
C. Adjustments applicable
to the three tubes
In such case, the remaining tube can be used as the reference for
centering and positioning of the new tubes.
B. Replacement of one or
two tubes
Neutral position 4-pole rings
2-pole rings
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Adjustment of the stigmators (4-pole magnet ring closest to the deflec-
tion yoke)
- Lower the brightness and increase the contrast.
- Overdrive the midpoint focus by adjusting the lens focusing for the respective
CRT.
- Adjust the four pole rings until the defocused dots are circular.
- Realign the electrical and optical focus.
- Reposition the raster as described earlier.
- Due to mutual influence between the stigmators, focus and centering, it is
advised to repeat above a couple of times.
Adjustment of the 2-pole magnets (the rings closest to the CRT socket)
- Underdrive the electronic focus by adjusting the left arrow key of the RCU
for the respective CRT.
- Adjust the 2-pole magnets rings by rotating one or both up to a point where
the 'shading' of both sides of the vertical and horizontal lines is equal (see
figure).
- Realign the electrical and optical focus.
- Repeat the alignment of the stigmators if necessary, as both adjustments
(stigmator and 2-pole magnets) influence each other.
ab
d
c
a<b
c<d
a' b'
d'
c'
a'=b'
c'=d'
Re-alignment of the image width coil(s)
- Decrease the contrast and increase the brightness to reveal the background
raster.
- Refer to sheet 'Deflection module R762447' in this manual for the alignment
of the image width coils.
Note:
When only one tube has been replaced, you can use the image width of one
of the other tubes as a reference, and obviously limit the adjustment to the core
of the corresponding replaced tube.
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D. Raster centering
The raster must be centered on the CRT screen surface of each tube,
therefore, it is necessary to look into the lenses.
Raster centering controls (please refer to the projector installation manual).
RASTER CENTERING
<ENTER> to continue
<EXIT> to return
CONTRAST LEVEL IS REDUCED
AND BRIGHTNESS INCREASED
TO MAKE THE RASTER
VISIBLE ONTHE FACE PLATE
OF EACH CRT.
USE THE ARROW KEYS
TO CENTER THE RASTER
ON THE GREEN, RED AND
BLUE CRT RESPECTIVELY
GREEN
BLUE RED
Picture movement when adjusting the arrow keys to
center the GREEN RASTER
To center the RED raster VERTICALLY, press "ENTER"
NOTICE: the RED and Blue raster are tracked with
the GREEN raster horizontally.
Center the raster vertically, using the arrow keys of the RCU ’up’ and ’down’
To center the BLUE raster VERTICALLY, press "ENTER"
Center the raster vertically, using the arrow keys of the RCU ’up’ and ’down’
Additional HORIZONTAL corrections for the RED and BLUE
raster after picture tube replacement only.
(Two multiturn potentiometers are provided on the module ’Focusing+Shift")
GREENBLUE RED
P2 RED
P1 BLUE
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