Viewsonic PJ452-2 Service Manual

Service Manual

ViewSonic PJ452-2

Model No. VS11334

LCD Projector

ViewSonic

(PJ452-2_SM Rev. 1a May. 2006)



381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

ECR Number

5/15/06

Revision History

Description of Changes

Initial Release

EditorRevision SM Editing Date

BonnieT

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Names of each part

4. Adjustment 5

. Troubleshooting

. Service points

. Wiring diagram

7 8

. Disassembly diagram

9. Replacement parts list . RS-232C commands

11. Block diagrams

12. Connector connection diagram

13. Basic dircuit diagram

1 2

3 5

11 16

30 34 42

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1. Precautions and Safety Notices

1. When replacing the lamp, use care to avoid burns to your fingers. The lamp becomes very hot during operation.

2. Never touch the lamp with your fingers as body oil transferred to the lamp can damage the lamp’s useful life.

3. Never drop the lamp or jar it in any manner. This may cause the lamp to burst.

4. This projector is provided with a high voltage circuit for the lamp. Do not touch any electric part or component after the projector has been turned on and is operating. Doing so could induce a severe shock causing injury or death.

5. Do not touch the exhaust fan, nor block its air flow, during operation, as the fan is hot.

6. The LCD module assembly can be easily damaged during service. If replacing the LCD Lens/Prism assembly, do not hold the FPC of the LCD module assembly.

7. Use only the cables which are included with the projector, or are specified in this manual.

Warning

The technical information and parts shown in this manual are not to be used for: the development, design, production, storage or use of nuclear, chemical, biological or missile weapons or other weapons of mass destruction; or military purposes; or purposes that endanger global safety and peace. Moreover, do not sell, give, or export these items, or grant permission for use to parties with such objectives. Forward all inquiries to the SUPPLIER.

Caution

Be sure to read this manual before servicing. To assure safety from Þ re, electric shock, injury, harmful

radiation and materials, various measures are provided in this Multimedia LCD Projector. Be sure to

read cautionary items described in the manual to maintain safety before servicing.

Service Warning

1. When replace the lamp, to avoid burns to your Þ ngers. The lamp becomes too hot.

2. Never touch the lamp bulb with a Þ nger or anything else. Never drop it or give it a shock. They may

cause bursting of the bulb.

3. This projector is provided with a high voltage circuit for the lamp. Do not touch the electric parts of

power unit (circuit/ballast), when turn on the projector.

4. Do not touch the exhaust fan, during operation.

5. The LCD module assembly is likely to be damaged. If replacing to the LCD/PRISM assembly, do not

hold the FPC of the LCD module assembly.

6. Use the cables which are included with the projector or speciÞ ed.

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Features

• High Brightness

• Low Noise

• Compact Body

2. Specifications

Liquid clystal panel

Lamp 165W UHB

RGB signal

VIDEO signal

AUDIO signal

Speaker output 1W(mono)

Power supply AC100~120V/2.7A,AC220~240V/1.5A

Power consumption 240W

Dimensions 285 (W) x 73 (H) x 202 (D) mm (Not including protruding parts)

Weight 2.3kg

Temperature range

Accessories

Drive system TFT active matrix

Panel size 1.5cm(0.6type)

Number of pixels 1024(H) x 768(V)

1 Video : Analog 0.7Vp-p(75Ω termination)

RGB IN

RGB OUT

VIDEO IN 1.0Vp-p (75Ω termination)

S-VIDEO IN

AUDIO IN 200mVrms, 47kΩ or more (max. 3.0Vp-p)

AUDIO OUT 0~200mVrms, output impedance 1kΩ (max. 5.0Vp-p)

H/V. sync. : TTL level (positive/negative)

Composite sync. : TTL level

Video:Analog 0.7Vp-p, 75Ω output impedance (positive) H/V. sync.: TTL level (positive/negative) Composite sync.: TTL level

Y signal: 1.0±0.1Vp-p, (75Ω termination)

C signal: 0.286±0.1Vp-p (NTSC burst signal, 75Ω termination)

0.3±0.1Vp-p (PAL/SECAM burst signal, 75Ω termination)

Operation : 5~35°C Storage : -20~60°C

Remote control x 1pcs RGB cable x 1pcs Power cords x 3pcs Batteries x 2pcs

Filter cover for bottom up use x 1pcs

Lens cap x 1pcs

Strap x 1pcs User’s manuals x 1set

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3. Names of each part

Part names

Projector

Vent

Lens cover

Lamp cover

(Lamp unit is inside.)

Control buttons

Lens

Zoom ring

Focus ring

Remote sensor

Speaker

Elevator button

Elevator foot

Front-Right side

Filter cover (Air Þlter and intake vent are inside.)

Bottom side

Power switch

AC inlet

Ports (See below.)

Elevator button

Elevator foot

Rear-Left side

Vent

RGB IN2 port

Restart switch

RGB OUT port

CONTROL port

S-VIDEO port

RGB IN2 RGB OUT RGB IN1

CONTROL

S-VIDEO VIDEO

Ports

AUDIO IN

Kensington lock slot

RGB IN1 port

AUDIO-OUT port

OUT

AUDIO-IN port

VIDEO port

NOTE (*) About Restart switch: This projector is controlled by an internal microprocessor. Under certain exceptional circumstances, the projector may not operate correctly and the microprocessor will need to be reset. In such a case, please push the Restart switch by using a cocktail stick or similar, and before turning on again, make the projector cool down at least 10 minutes without

operating. Only push the Restart switch in these exceptional instances.

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Controls

Zoom

enu cursor buttons

LAMP indicator

TEMP indicator

POWER indicator

INPUT button

Cursor buttons ▲,▼,◄,►

STANDBY/ON button

emote contro

SEARCH button

RGB button

VIDEO button

ASPECT button

VIDEO

ASPECT

LAMP

TEMP

POWER

INPUT

STANDBY/ON

RGB

AUTO

STANDBY/ON

BLANK

TANDBY/ON button

AUTO button

BLANK button

MAGNIFY ON button

OFF button

FREEZE button

POSITION button

ESC button

MAGNIFY

OFF

FREEZE

POSITION

ESC

ENTER

VOLUME

KEYSTONE

ZOOM

MUTE

RESET

LUME button

MUTE button

KEYSTONE button

+ button

- button

MENU button

▲,▼,◄,►

ENTER button

RESET button

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4. Adjustment

4-1 Before adjusting

4-1-1 Selection of adjustment

When any parts in the table 4-1 are changed, choose the proper adjusting items with the chart.

Table 4-1: Relation between the replaced part and adjustment

Replaced

part

Dichroic

optics unit

LCD/LENS

prism

assembly

PWB

assembly

Main

Lamp

unit

assembly

Convergence

(Chap.4-2)

E-POS

(Chap.4-3)

(Chap.4-4)

: means need for adjustment. : means not need for adjustment.

Adjustment

Ghost

: means recommended.

Flicker

(Chap.4-5)

NRSH

(Chap.4-6)

White

balance

(Chap.4-7)

Color

uniformity

(Chap.4-8)

4-1-2 Setting of condition before adjustment

1. Before starting adjustment, warm up projector

for about 10 minutes.

2. Set Zoom Wide to Max. And project an image

with more than 1m (40 inches) in diagonal size.

3. Normalizing the video adjustment

Press the [MENU] button to display the Easy

menu. If Advance menu comes up, move to the

Easy menu.

Select RESET in the Easy menu and press [

or [ENTER] button to open the RESET menu

window. Choose EXECUTE with [ ] button.

Note that no signal input may not allow to reset

the adjustments.

4. Select PICTURE > GAMMA in the Advance

menu to set to DEFAULT1.

Note that PICTURE menu is not selectable with

no signal input displayed.

5. Select PICTURE > COLOR TEMP > CUSTOM

in the Advance menu, then press [ ] or [ENTER]

button to display the equalizing window. Set all

the values of OFFSET and GAIN in the window

to zero.

Caution: Before this performance, make a note

of your customer’s adjustments, because the

data is overwritten.

6. Perform all adjustments from the FACTORY

MENU.

Perform the following operations to display the

FACTORY MENU.

< When you use the remote control… >

a. Press the [MENU] button of remote control to

display the Easy menu. (If the Advance menu

appears, move to the Easy menu from EASY

]

MENU.)

b. Select the [RESET] in the Easy menu, and

then press the [ ] or [ENTER] button.

c. Next, press the [RESET] button one time.

And hold the [RESET] button for 3 seconds

or more (the FACTORY MENU will appear).

< When you use the keypad… >

a. Press the [ ]/[]/[ ]/[ ] button of the projec-

tor to display the Easy menu. (If the Advance

menu appears, move to the Easy menu from

EASY MENU.)

b. Select the [

RESET

] in the Easy menu, and

then press the [ ] button.

c. Next, press the [ ] button one time. And

repress and hold the [ ] button together

with the [INPUT] button for 3 seconds or

more (the FACTORY MENU will appear).

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4-2 Convergence adjustment

Signal pattern for internal adjustment

4-3

E-POS adjustment

(vertical bars adjustment)

Signal pattern for internal adjustment

112/255

4-4 Ghost adjustment

Signals for internal adjustment

30%

0/255

112/255

Adjustment procedure

1. Open FACTORY MENU and then select

OPTION > CNV-V. Use R and/or B so that

three colors of images can be converged at

center, top and bottom of the screen.

2. In the same way, select OPTION > CNV-H and

use R and/or B so that three colors of images

can be converged at center, left and right of the

screen.

Adjustment procedure

1. Make this adjustment after completing the

adjustment 4-2 Convergence adjustment.

2. Choose Advance menu > OPTION > SERVICE

> GHOST > R,G and B, and set them to zero.

Open FACTORY MENU. Select DAC-P > E-POS

> R and use it so that vertical bars can disappear.

4. In the same way, select DAC-P > E-POS > G

and use it so that vertical bars can disappear.

5. In the same way, select DAC-P > E-POS > B

and use it so that vertical bars disappear.

Adjustment procedure

1. Make this adjustment after completing the adjustment in 4-3.

2. Choose Advance menu > OPTION > SERVICE > GHOST > R,G and B, and set them to zero.

3. Open the FACTORY MENU and choose DAC-P > GHOST > R,G and B to display each color of test patterns for adjustments. Confirm if there is ghosting on the both sides of black pattern. If visible, perform this adjustment as following procedure. Use DAC-P - GHOST - R: in the FACTORY MENU to adjust so that R color ghost is at a minimum.

(Reset the adjustment value, and then raise the value.

When a ghost appears to the left of a vertical line, reduce the value by 4 steps. Then, if a ghost image is visible on the right of an original image, raise the number by 1 step.)

4. Use DAC-P - GHOST - R: in the FACTORY MENU to adjust so that R color ghost is at a minimum.

(Set the adjustment value to default, and then raise the

value. When a ghost appears to the left of a black window, reduce the value by 4 steps.)

5. In the same way, use DAC-P - GHOST-G: in the FACTORY MENU to adjust so that G color ghost is at a minimum.

6. In the same way, use DAC-P - GHOST-B: in the FACTORY MENU to adjust so that B color ghost is at a minimum.

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4-5 Flicker adjustment

(V.COM adjustment)

Signals for internal adjustment

4-6

NRSH adjustment (vertical stripe adjustment)

Signals for internal adjustment

/255

112

/255

136

/255

160

/255

Press ENTER key

160

136

/255

112

/255

/25588/25564/255

Adjustment procedure

1. Make this adjustment after completing the adjustment in 4-4 Ghost adjustment.

Use DAC-P - V.COM - R: in the FACTORY MENU to adjust so that the flicker at the center of the screen is less than the flicker at the periphery. (When the flicker is about the same across the whole screen, adjust so that the flicker at the center of the screen is somewhat less than elsewhere.)

3. In the same way, use DAC-P - V.COM-G: in the FACTORY MENU to adjust the G color flicker.

4. In the same way, use DAC-P - V.COM-B: in the FACTORY MENU to adjust the B color flicker.

Adjustment procedure

1. Make this adjustment after completing the adjustment in 4-5 Flicker adjustment.

2. Use DAC-P - NRSH - R: in the FACTORY MENU to adjust so that the vertical lines spaced every 6 dots are as inconspicuous as possible.

(Reduce the adjustment value when black

stripes appear in the 2nd or 3rd tone from the black side. Note that when the adjustment value is lowered, white stripes may appear in the 2nd or 3rd tone from the bright side. Should this happen, adjust so that the stripes are as inconspicuous as possible.) In the same way, use DAC-P - NRSH - G: in the

3. FACTORY MENU to adjust vertical stripes of G color.

In the same way, use DAC-P - NRSH - B: in the Adjustment menu to adjust vertical stripes of B color.

4-7

White balance adjustment

(visual inspection)

Preparations

1. Perform these adjustments after the NRSH adjustment described in Section 4-6.

Adjustment procedure

1. First, adjust the G color.

Select GAMMA, SUB-CNT, and G: in the FACTORY MENU. If the background is white solid, press the [ENTER] key on the Remote control transmitter to change to [G] monochrome in the 33-tone grayscale.

3. Adjust GAMMA, SUB-CNT, and G: in the FACTORY MENU so that brightness of 33 steps is best.

4. Don’t adjust GAMMA, SUB-BRT, and G: in the FACTORY MENU. Because we want to keep the best contrast ratio.

5. Then adjust colors R and B.

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2. Reset gamma correction before adjustment. Place the cursor on [GAMMA] in the FACTORY MENU, press the [RESET] key and select [DEFAULT].

Select GAMMA, SUB-CNT, and R: and B: in the FACTORY MENU. If the background is white solid, press the [ENTER] key on the Remote control trasmitter to change to [W] monochrome in the 33-tone grayscale.

7. Adjust GAMMA, SUB-BRT, R: and B: in the

FACTORY MENU so that low-brigtness white balance is best.

8. Adjust GAMMA, SUB-CNT, R: and B: in the

FACTORY MENU so that middle-brightness white balance is best.

9. Repeat steps 7 to 8 above, and adjust so that

brightness white balance of 33 steps is best.

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4-8 Color uniformity adjustment

Preparations

Perform these adjustments after the white balance

adjustment described in Section 4-7.

2. Make a color uniformity adjustment for the follow-

ing four tones.

MIN tone (approx. 4% input signal)

MID-L tone (approx. 14% input signal)

MID-H tone (approx. 25% input signal)

MAX tone (approx. 57% input signal)

3. Place the cursor on [C.UNIF.] in the FACTORY

MENU and press the [ ] key. This displays the

Adjust Tone menu at the bottom of the screen.

To choose the tone to be adjusted, press the [ ]

key and then use the [ ] or [ ] key.

Select the major adjustment lattice point No.

and color, and then adjust them.

4. The major adjustment lattice point numbers (a

total of 17 points) corresponds to the major

adjustment lattice point positions in the diagram

on the right. The color uniformity of the entire

screen can be adjusted by adjusting the white

balance for each of the points starting in order

from the low numbers.

5. Adjustment point No.1 should not be adjusted,

because it controls the brightness of the entire

screen.

To temporarily turn correction off, place the

cursor on [C.UNIF.] in the Adjust Tone menu and

press the [

] key. The ON/OFF menu appears.

Place the cursor on [ON] with the [ ] key and

press the [ ] key. To turn it on again, place the

cursor on [OFF] and press the [ ] key.

7. Although this adjustment can also be made

using internal signals, we will here use the

[ENTER] key on the Remote control transmitter

to select the following two signals.

Solid monochrome adjustment color (use G

color adjustment when a color differential

meter is used).

Solid white (use for adjustment other than

above).

8. Reset color-shading correction before adjust-

ment.

When 4 tones and all colors are to be reset,

place the cursor on [C.UNIF.] in the FACTORY

MENU, press the [RESET] key and select

[DEFAULT].

When only 1 tone is to be reset, place the

cursor on the tone to be reset, press the

[RESET] key and select [DEFAULT].

Single tone and monochrome resets cannot

be performed.

FACTORY MENU

VID-AD

C. UNIF.

DAC-P GAMMA STRIPE OPTION

Adjust tone menu

C.UNIF

ON/OFF ON

MIN

MID-L

MID-H

MAX

OFF

No. 1 R 0

Major adjustment lattice point No.

G 0 B 0

Major adjustment lattice point position

14 12

H/6 H/3 H/3 H/6

10 11

15 17

V/6

6 4 8

V/3

2 1 3

V/3

7 5 9

V/6

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Adjustment procedure 1

(When a color differential meter is used)

1. First adjust [MID-L] tone [G:].

2. Select adjustment point [No.2][G:].

When the background is not [G] monochrome,

press the [ENTER] key on the Remote control

transmitter to change to solid [G] monochrome.

3. Measure the illumination at adjustment points

No. 2, No.3, No.10 and No.11.

The values should be:

No.2 = Y2 [lx] No.10 = Y10 [lx]

No.3 = Y3 [lx] No.11 = Y11 [lx]

4. No.2 and No.3 adjustment point have the aver-

age of Y2 and Y3.

Y2 = ( Y2 + Y3 ) / 2 ± 2 [%]

Y3 = ( Y2 + Y3 ) / 2 ± 2 [%]

5. No.10 and No.11 adjustment point have the

average of Y10 and Y11.

Y10 = ( Y10 + Y11 ) / 2 ± 2 [%]

Y11 = ( Y10 + Y11 ) / 2 ± 2 [%]

6. Then adjust [MID-L] tone [R] and [B].

When the background is [G] monochrome,

press the [ENTER] key on the Remote control

transmitter to change to solid white.

7. Measure the color coordinates of adjustment

point [No.1] and make a note of them.

Assume that they are x = x1, y = y1.

Note: When the CL-100 color and color differ-

ence meter is used, the [ ∆ ](delta) mode

is convenient. When adjustment point

[No.1] color coordinate has been

selected, set the slide switch on the side

to [∆ ](delta) while holding down the [F]

button on the front panel. The measure-

ment shown after this displays the devia-

tion from measurement point 1.

8. Measure the color coordinates of measurement

point [No.2] and adjust [No.2][R:] and [B:] so

that the coordinates are as follows.

x = x1 ± 0.005 , y = y1 ± 0.010

9. Similarly, measure adjustment points [No.3] to

[No.17] and adjust their color coordinates start-

ing in order from the small number points.

This completes adjustments required for [MIN].

Note: Since excessive correction may lead to a

correction data overview during internal

calculations, use the following values for

reference.

[No.2] to [No.5] ± 40 or less

[No.6] to [No.9] ± 50 or less

[No.10] to [No.13] ± 70 or less

[No.14] to [No.17] ± 120 or less

10. Then adjust [MIN] tone [G] so that the adjust-

ment data set two times as much as [MID-L]

tone [G].

This completes [G] color adjustments.

11. Then adjust [MIN] tone [R] and [B].

Select [No.2] [B:] and press the [ENTER] key

on the Remote control transmitter to change to

solid white.

12. Measure the color coordinates of adjustment

point [No.1] and make a note of them.

Assume that they are x = x1, y = y1.

13. Now measure the color coordinates of mea-

surement point [No.2] and adjust [No.2][R:] and

[B:] so that the coordinates are as follows.

x = x1 ± 0.005 , y = y1 ± 0.010 (Target)

x = x1 ± 0.020 , y = y1 ± 0.040

14. Similarly, measure adjustment points [No.3] to

[No.17] and adjust their color coordinates start-

ing in order from the small number points.

This completes [MIN] tone adjustments.

15. Now make similar adjustments for [MID-H] tone.

(Adjust [MID-H] tone [G] so that the adjustment

data set half as many as [MID-L] tone [G].)

16. Now make similar adjustments for [MAX] tone.

(Adjust [MAX] tone [G] so that the adjustment

data set half as many as [MID-L] tone [G].)

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Adjustment procedure 2

(visual inspection)

1. First adjust [MIN] tone [G:].

2. Select [No.2] [G:].

If the background is [G] monochrome, press the

[ENTER] key on the Remote control transmitter

to change to solid white.

3. View measurement point [No.2] and [No.3].

Lower the [G] color intensity only of the color

point whose [G] color is more intense than

measurement point [No.1].

4. View measurement point [No.10] and [No.11].

Lower the [G] color intensity only of the color

point whose [G] color is more intense than

measurement point [No.1], and raise the inten-

sity of the point whose color intensity is lower

than measurement point [No.1].

5. Now adjust the [MIN] tone for colors [R] and [B].

6. View measurement points [No.2], [No.3],

[No.10] and [No.11]. Adjust the [R] and [B] of

each measurement point so that they have the

same color as measurement point [No.1].

Adjustment technique:

First, adjust [B:] of the point whose color is to

be adjusted so that it approximates that of

[No.1]. If [R:] is low at this time, the image will

have cyan cast, in which case [R:] is increased.

On the other hand, if [R:] is excessive, the

image will have a magenta cast, in which case

[R:] is decreased.

Overall, a cyan cast makes it easy to see color

shading.

7. Next, view measurement points [No.4], [No.5],

[No.12], [No.13] and make similar adjustments.

Then adjust measurement points [No.6], [No.7],

[No.8], [No.9], [No.14], [No.15], [No.16] and [No.17].

This completes the [MIN] tone adjustments.

9. Make similar another three tones as described

in steps 1 to 8 above.

No. 2 deviation range No. 10 deviation range No. 3 deviation range No. 11 deviation range

15 13

14 12

15 13

14 12

15 13

No. 4 deviation range No. 12 deviation range No. 5 deviation range No. 13 deviation range

3 112

14 12

15 13

113 11210 1

15 13

1614 12

86 4 84

10 1

15 13

1614 12

10 1

No. 6 deviation range No. 7 deviation range No. 8 deviation range No. 9 deviation range

15 13

1614 12

86 4 84

3 11210 1

10 12

1614 12

1315

418

3 112

14 12

1 3 11

No. 14 deviation range No. 15 deviation range No. 16 deviation range No. 17 deviation range

1614 12

84 84

1614 12

14 12

15 13

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3 112 1

10 12

1 3511

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5. Troubleshooting

Check points

*Top view of the projector after the silver gilding over the lamp

house and black sheet on the main board are detached.

Thermal SW assembly(TSW)

PWB assembly SW

E801

E804

E301

E802

CNLC

E800

D303

(LAMP)

P501

E803

ESPL

CHSYM

D302

(TEMP)

D301

(Power)

PWB assembly I/O

P601

CNVD

EA05 CHCVM CHSCM

EM02

PWB assembly REMOTE

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E807

E805

P701

PWB assembly MAIN

E302

E101

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E806

EM01

CNCO

Power can not be turned on

Are

voltage input at

pins (1)(3)(5)(7) of E800

on the PWB assembly

Main at standby

mode?

YES

What is the state of

TEMP indicator D302?

Not light

What is the state of

LAMP indicator D303?

(1): +0V (3): +17V (5): +6.6V (7): +4.1V

Blinks

Unplug

power cord and

disconnect TSW from the

power unit (circuit), then

measure resistance of

the cooled

TSW.

Short

Power unit (circuit)

Jump to * on the next page

Is the LAMP DOOR

set?

Open

Power unit (circuit)

Thermal SW assembly

Fuse on the

Set the LAMP DOOR

(TSW)

Not light

PWB assembly Main

Short (0 )

Unplug

power cord and

disconnect cable CNLC,

then measure resistance

between pins (1)

and (2) of

CNLC.

Open

PWB assembly SW

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Lamp does not light

DC FAN

BM4515

NO(Failure)

What is the state of LAMP indicator D303 during operation?

Not light

Does voltage of E806’s 1st pin drop to 0V

temporarily soon after projector

is powered up?

Light NG

Blinks

See Fig.1

Is the LAMP

installation correct?

YES

Change the lamp.

Does lamp light?

Not light

Is the

voltage at the

(1) of E804 on the PWB

assembly MAIN fixed to "L"

during warming-up?

Power unit (ballast)

What is the state

of TEMP indicator D302?

Install the Lamp

Light

YES

"L" = 0V

Power unit (circuit)

PWB assembly MAIN

Lamp

DC FAN

D06T

DC FAN

TYF450L

DC FAN

TYF400L

NO(Failure)

YES(Normal)

Does voltage of E801’s 1st pin drop to 0V

temporarily soon after projector

is powered up?

YES(Normal)

Does voltage of E807’s 1st pin drop to 0V

temporarily soon after projector

is powered up?

YES(Normal)

Does voltage of E802’s 1st pin drop to 0V

temporarily soon after projector

is powered up?

YES(Normal)

PWB assembly MAIN

See Fig.1

Not light

Is the voltage

at the (3) of E804 on

the PWB assembly MAIN

set to "L" during

warming-up?

YES

Power unit (ballast)

Fig.1 Waveform shape

H(2.5V)

Normal

H(2.5V)

Failure

"L" = 0V

PWB assembly MAIN

about 1 sec.

On stand-by

Powered upAC on

On stand-by

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Picture is not displayed.

Are

the splash

screen and the user menu

displayed correctly?

YES

Are both of pictures

from RGB1 and RGB2 ports

displayed correctly?

YES

Observe

the video signal

voltage-waveform at the CHCVM.

Is it half amplitude of the

original?

YES

PWB assembly MAIN

PWB assembly I/O

Confirm CNVD

Confirm

the LCD Panels

connection to the MAIN

CPC30 connector

board.

PWB assembly MAIN LCD/Lens prism assembly

connection

Observe

the s-video signal

voltage-waveforms at the

CHYSM and CHYCM. Are they half

amplitude of the originals?

YES

PWB assembly MAIN

Ex: Observed and original waveforms

0.5*A

Observed Original

(75ohm terminated)

PWB assembly I/O

Confirm CNVD

connection

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Can not control to RS-232C

Check the

RS-232C cable.

Are pins No. 2 and 3

crossed?

YES

Is the

proper voltage

supplied to the pin (1) of

EM01 of the I/O

board?

Are 5Vp-p

square waves

observed at the pin (3) of

E101 when commands are

transmitted from

PC?

Are

square waves

observed at the pin (2) of

EM01 when commands are

transmitted from

PC?

EM01(1): 5V

YES

Use cross cable

Check the cable CNCO connection

The check after parts change

1. PC power supply OFF

2. Connection of cable

3. Projector starting

4. PC starting *When not operating : PC set up change of cable.

PWB assembly MAIN

PWB assembly I/O

Make sure PC set up

PWB assembly I/O

PWB assembly MAIN

No sound

Are

voltage input at pin

(1)(3)(5)(7) of the E800 on

the PWB assembly

MAIN?

YES

(1): +13.2V (3): +17V (5): +6.6V (7): +4.1V

Turn off

the projector and

disconnect the speaker

cable from ESPL. Measure

the resistance of

the speaker

about 8Ω

Power unit (circuit)

PWB assembly MAIN

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0Ω or infinity

Speaker

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6. Service points

6-1 Lead free solder [CAUTION]

This product uses lead free solder (unleaded) to help preserve the environment. Please read these

instructions before attempting any soldering work.

CAUTION

Always wear safety glasses to prevent fumes or molten solder from getting into the eyes. Lead free solder

can splatter at high temperatures (600˚C).

Lead free solder indicator

Printed circuit boards using lead free solder are engraved with an "F" or "LF".

Properties of lead free solder

The melting point of lead free solder is 40-50˚C higher than leaded solder.

Servicing solder

Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended.

Although servicing with leaded solder is possible, there are a few precautions that have to be taken. (Not

taking these precautions may cause the solder to not harden properly, and lead to consequent malfunctions.)

Precautions when using leaded solder

Remove all lead free solder from soldered joints when replacing components.

If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the

lead free solder has been completely melted (do not apply the soldering iron without solder).

Servicing soldering iron

A soldering iron with a temperature setting capability (temperature control function) is recommended.

The melting point of lead free solder is higher than leaded solder. Use a soldering iron that maintains a high

stable temperature (large heat capacity), and that allows temperature adjustment according to the part being

serviced, to avoid poor servicing performance.

Recommended soldering iron:

Soldering iron with temperature control function (temperature range: 320-450˚C)

Recommended temperature range per part:

Part Soldering iron temperature

Mounting (chips) on mounted PCB 320˚C±30˚C

Mounting (chips) on empty PCB 380˚C±30˚C

Chassis, metallic shield, etc. 420˚C±30˚C

The PWB assembly which has used lead free solder

(1) PWB assembly MAIN

(2) PWB assembly REMOTE

(3) PWB assembly SW

(4) POWER UNIT (BALLAST)

(5) POWER UNIT (CIRCUIT)

(6) PWB assembly I/O

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6-2 Replacing The LCD/PRISM assembly

You should not replace separately the parts of the LCD/PRISM assembly. In case of a failure in any parts of

LCD/PRISM assembly, replace the whole LCD/PRISM assembly.

Do not disassemble the unit because replacement of separate parts is not possible.

LCD/PRISM ASSY

6-3 Cleaning up dust from panels and optical filters

WARNING

Wear sunglasses to protect your eyes when you maintain the projector with its lamp on.

1. Preparation

Please prepare cleaning tools and materials as follows. And prepare relatively clean room not to work in additional dust, while removing operation. (1) Swab for cleaning : P#: NX08061, "Cotton stick L147" (2) Air duster (Dust blower, spray can) (3) Vacuum cleaner

2. Disassemble and open the maintenance hole.

(1) Turn off the projector, and unplug the power cord. (2) Remove the top cover, according to the notice 1 of chapter 8. (3) Remove the PWB assembly MAIN, according to the notice-2 of the chapter 8. (4) Remove the Panel Cover.

Connect 9 cables

Remove Panel Cover

Flexible cables of LCD panels

PWB assembly MAIN

(5) Attach the PWB assembly MAIN in original place, and connect 9 cables indicated in the diagram

above. Note that flexible cables of LCD panels should come to the upper portion of PWB assembly MAIN, but don’t connect them to the connectors. Make sure that flexible cables’ terminals don’t touch to any other parts during maintenance, especially when the projector is turned on.

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3. Maintenance point

Filter Stopper

Swab

Each color part has same

construction.

By using swab and air duster,

Panel

you can easily remove dust

from panel and optical filter.

The diagram shows the LCD/

PRISM block structure.

Actually, it is not allowed to

disassemble the block.

Actual formation

Optical Filter

Separated formation

Plate

4. Cleaning the LCD panels and optical filters

(1) Turn on the projector and lit on the lamp.

(2) By using swab and air duster, remove the dust. Insert swab through holes of MAIN board, and wipe

LCD Panels. Focusing dust makes you check the dust on screen.

Plate

Swab

• While removing the dust, separated dust

will be blown off by air cooling system.

• Please pay attention not to damage LCD

panels and optical filters.

Optical Filter

Panel

Prism

Air

5. Re-assembly

(1) Turn off the projector and remove the PWB assembly MAIN.

(2) Set the

Panel cover

so that stress is not put on flexible cables of LCD panels.

(3) Attach the PWB assembly MAIN in place, and connect cables to connectors of it.

(4) Re-assemble the projector.

(5)

While re-assembling, please clean the air filter and filter cover by using vacuum cleaner.

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6-4 Cleaning up dust from multilens

1. Preparation

Please prepare cleaning tools and materials as follows. (1) Air duster (Dust blower, spray can) (2) Swab for cleaning ; P#NX08061, ”Cotton stick L147” (3) Vacuum cleaner

2. Remove the lamp door and the lamp unit assembly.

(1) Turn off the projector, and unplug the power cord. (2) Remove the lamp door and lamp unit assembly accord-

ing to the description of chapter “Replacing the LAMP”.

3. Maintenance point

LAMP

multilens surface

Removeing the lamp shows the part multilens positioned vertically. Wipe the whole of the multilens surface using the sweb. CAUION : Use special caution not to damage the multilens

4. Cleaning the multilens

(1) By using the air duster, remove the dust on multilens. (2) Wipe the surface of multilens by using swab.

By using the air duster, remove the dust in multilens

CAUION : Use special caution not to scratch the multilens

Air duster

5. Attach the lamp door and the lamp unit assembly.

Attach the lamp door and the lamp unit assembly accoding the description of “Replacing the LAMP”.

CAUION : Use special caution not to scratch the multilens

swab

multilens surface

Cross section of multilens

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6-5 Putting batteries

WARNING

Always handle the batteries with care and use them only as directed. Improper use may result in battery explosion, cracking or leakage, which could result in ﬁ re, injury and/or pollution of the surrounding environ- ment.

• Be sure to use only the batteries speciﬁ ed. Do not use batteries of different types at the same time. Do

not mix a new battery with used one.

• Make sure the plus and minus terminals are correctly aligned when loading a battery.

• Keep a battery away from children and pets.

• Do not recharge, short circuit, solder or disassemble a battery.

• Do not allow a battery in a ﬁ re or water. Keep batteries in a dark, cool and dry place.

• Do not give the battery a physical impact.

• If you observe a leakage of a battery, wipe out the flower and then replace a battery. If the flower adheres your body or clothes, rinse well with water immediately.

• Obey the local laws on disposing a battery.

To use the remote control, please load the batteries. Whenever the remote control starts to malfunction,

replace the batteries. If you won’t use the remote control for an extended period, remove the batteries from

the remote control and store them in a safe place.

1. Remove the battery cover.

Slide back and remove the battery cover in the direction of the arrow.

2. Take old batteries out and/or put new batteries in.

When putting in batteries, align and insert the two AA batteries according to their plus and minus terminals

as indicated in the remote control.

3. Close the battery cover.

Replace the battery cover in the direction of the arrow and snap it back into place.

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+ 51 hidden pages

Viewsonic PJ452-2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual