Christie CP4220 Manuel utilisateur

Convergence Instruction Sheet 1 of 10

020-100703-01 Rev. 1 (05-2011)

CP4220/4230 Convergence

Instruction Sheet

INTRODUCTION

These instructions explain how to adjust convergence in the CP4220 and CP4230 projectors.

Information provided here supplements the main Convergence Instructions drawing provided inside

the top lid of the projector.

TOOLS REQUIRED

• 2.5 mm driver with heat-shrink tubing (2.0 inch and 6.5 inch lengths), included with projector. One

driver is located on the the high security lid and the other is located in the packaging.

INSTRUCTIONS

Convergence adjustment must be performed by a qualified service technician.

ACCESSING THE LIGHT ENGINE

Remove the top lid to access to the light engine and liquid cooling system compartments.

WARNING

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1. Use the low security key to unlock the front top lid(Figure 1).

2. Lift the lid up and remove.

Figure 1 Remove top Lid from Projector

Remove the high security lid to access components in the light engine and cardcage compartments.

NOTE: Only Christie authorized service technicians should open the high security lid.

3. Use the high security key to unlock the high security lid (Figure 2).

4. Lift the lid up and remove.

Figure 2 Remove High Security Lid

Convergence Instruction Sheet 3 of 10

020-100703-01 Rev. 1 (05-2011)

CONVERGENCE OVERVIEW

NOTICE! Do not run the projector while performing convergence with the Light

Engine Fan Pack or the Cooling Duct removed. This will cause overheating of the

Satellite Formatter Board FPGA’s. However, the fan packs can be removed for a short

time to access the adjustment screws. If this is necessary you can verify the

temperature at the TPC status window.

The projector has three separate DMD panels to produce three separate red, green and blue image

components. To get the most accurate color representation across the whole image it is essential the

three panels are perfectly aligned so that all pixels line up. The following convergence procedure

outlines how to achieve this.

Figure 3

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020-100703-01 Rev. 1 (05-2011)

BEFORE PERFORMING CONVERGENCE

• Make sure the image-zoom and centering is complete before performing convergence.

For details, refer to 3.2 Integrator Alignment, on page 3-2, of the CP4220 and CP4230 Service

manuals (P/N: 020-100691-xx/020-100622-xx).

• Make sure boresight procedures have been completed before performing convergence.

For details, refer to the CP4220 and 4230 User Manual (P/N: 020-100690-xx/020-100621-xx).

• Use only a prime lens when performing convergence. DO NOT use an anamorphic or Wide Con-

verter Lens (WCL).

• The projector should be set up to final maximum usable brightness for the installed application.

• 14FL for Standard 2D

• ~25-30FL for Single Projector 3D with a silver screen

• 25FL per projector for Dual Projector 3D

• Once at the required power setting, the unit should be allowed to come “up to temperature” for at

least 15 minutes. Note this nominal operating temperature for monitoring as you perform conver-

gence.

IMPORTANT: During convergence, the lid and/or filter side of the projector will be open, causing

decreased prism cooling performance and possible shifts in convergence or DMD focus. The prism

temperature should be monitored during the adjustment and kept within a few degrees of the nominal

temperature achieved above by lowering the lamp power or periodically replacing the cover for a

cool-down.

• Watch for over-temperature alerts when running near 6000W. Cool-down periods with the shutter

closed and cover on may be required.

• The active screen file should be 4096 x 2160 no crop to prevent any scaling of your reference test

pattern.

• Typically the blue image component can be used as the fixed reference, so no adjustment is required.

However, if you need to adjust the blue image component it is easy to adjust, but the side panel must

be removed. The recommended normal convergence adjustments are from green to blue and red to

green.

• It is recommended that the vertical and rotation adjustment be done first, as they work dependently

together and the horizontal adjustment done last.

• Use extreme caution to not damage any components on the board.

• DO NOT push or force the adjustment screws when turning them.

• You do not always have to turn the screws simultaneously; however, adjusting one at a time will

cause the need for an equal or equal and opposite turn on the other to achieve the adjustment desired.

• There are no Lockdown screws with the CP4220 and CP4230 light engines.

Convergence Instruction Sheet 5 of 10

020-100703-01 Rev. 1 (05-2011)

EVALUATING CONVERGENCE

1. Display either the Alignment Pattern or the Framing Pattern (Figure 4). NOTE: The framing

pattern may not be installed on the projector in some cases. Keep a copy of this pattern on your

laptop and load it to the projector you are working on if it is not present.

2. Zoom and focus the image so you can see the entire outer edge of the test pattern frame.

Figure 4 Alignment and Framing Pattern

3. You should be able to judge the convergence issues by using the horizontal and vertical white

lines. Look at one color at a time and remember that you can see a possible 7 colors to lead you to

a valid conclusion. (Figure 5) The stripe pattern boxes along the outer frames can be very helpful

as well.

Figure 5 Seven Color Possibilities

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4. Look for “twist” using the center vertical and horizontal lines – scan from one side of the screen to

the other, observing any change in vertical position of the color in question relative to the point

where you started. (Figure 6) is an example of a projector with two problems; Red is twisted

counter-clockwise and Blue is high and to the left with no apparent twist.

Figure 6 Poor Convergence Example (pattern simplified)

Convergence Instruction Sheet 7 of 10

020-100703-01 Rev. 1 (05-2011)

RED/GREEN/BLUE FORMATTER CONVERGENCE ADJUSTMENT

Remove all jewelry (rings, watches, necklaces, braclets etc.) before

adjusting convergence.

NOTE: Do not apply excessive force on the adjustment screws. This might cause the convergence

adjustment to become misaligned once you remove the adjustment tool.

The Red and Green Formatters are identical in physical layout and adjuster function. The Blue

formatter board is slightly different in physical layout, but the adjustment functions are the same. The

vertical and twist adjustments (Screws 1 and 2) interact with each other, while the horizontal

adjustment (Screw 3) is indpendent, as described in (Figure 7).

Figure 7 Red/Green/Blue Formatter Convergence Adjustment

The physical layout of the Formatter boards dictates the behavior of the Twist and Vertical

adjustments:

• The adjustment of the twist and vertical is more like a “Twist with the left-side of the screen as a

sliding hinge point to allow vertical travel”.

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• The vertical and twist adjustment screws (Screw 1 and 2) interact with each other such that if one is

turned in the opposite direction of the other, the twist is affected.

• If both screws are turned equal amounts in the same direction, the image moves vertically.

• Remove the Light engine air filter and fan pack to access the blue convergence adjustment screws.

For details, refer to 5.6.1 Light Engine Air Filter, on page 5-11 and 5.7.2 Light Engine Fan Pack

(4 fans), on page 5-13 of the CP4220 and CP4230 Service manauls (P/N: 020-100691-xx/020-

100622-xx). NOTE: Cooling is greatly affected by removing the filter and fan pack assembly. The

FPGA temperatures can be monitored from the TPC.

You do not always have to turn the screws simultaneously; however, adjusting one at a time will cause

the need for an equal or equal and opposite turn on the other to achieve the adjustment desired.

It is a good idea to locate the shorter blade 2.5mm driver on adjusting screw #2 (especially on the red

Satellite board), and use the longer blade 2.5mm driver for screw#1 and horizontal screw #3.

Figure 8 Red/Green/Blue Formatter Twist and Vertical Adjustments

Convergence Instruction Sheet 9 of 10

020-100703-01 Rev. 1 (05-2011)

• The horizontal adjustment screw is independent of the vertical and twist adjustments.

Figure 9 Red/Green/Blue Formatter Horizontal Adjustments

FINAL CONVERGENCE ASSESSMENT

When should you be satisfied with your adjustments? Read the following section before coming to a

conclusion (Figure 10).

1. The best possible convergence would be described as follows:

a. The center area highlighted should be perfectly aligned showing solid white pixels.

b. The Red should be evenly 1/4 to 1/2 a pixel out all the way around the outer area not

highlighted showing cyan (green+blue) towards the center of the screen.

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c. Green and Blue should always be perfectly aligned to each-other (to within ¼ pixel total in one

or a combination of directions.)

Figure 10 Best Possible Convergence

2. In certain circumstances, there may be further tolerance deficiencies in the prism assembly in

combination with the projection lens that will cause the normal Red over-sizing to become slightly

non-uniform.

a. In practice, this extra increase in size has generally appeared on the lower-right of the image,

causing an apparent clockwise twist in the lower-right corner only – the upper left, right and

lower-left all look OK.

b. The only way to deal with this will be to “Split the difference” pushing the rest of the image

slightly twisted counter-clockwise to minimize the effect on the bottom of the screen, keeping

the subtitle zone as converged as possible.

c. If the problem appears to be more than an extra 1/2 of a pixel out of uniformity, a new lens/

prism assembly may be the only solution.

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