Barco R9002380 Manual de usuario

Date: 15/05/2000

Replacement of a picture tube

Cine 7

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

Date: 15/05/2000

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

Date: 15/05/2000

Replacement of a picture tube

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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

EHT lead

Drive module removed

Date: 15/05/2000

Replacement of a picture tube

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R9002380

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C. CRT Disassembly

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.

Date: 15/05/2000

Replacement of a picture tube

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R9002380

R9002389

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

Date: 15/05/2000

Replacement of a picture tube

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R9002380

R9002389

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

Date: 15/05/2000

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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.

a<b

c<d

a' b'

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.

Date: 15/05/2000

Replacement of a picture 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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