ViewSonic PJ860-2 User manual

Service Manual
ViewSonic PJ860-2
Model No. VPRJ21558-1
Color SVGA Ultra Bright Portable
LCD Projector
Rev. 2 — February 2000
ViewSonic®
381
Brea
Canyon
Road,
Walnut,
California
91789
USA
-
(800)
888-8583

Copyright
Copyright
©
1998
by
ViewSonic
Corporation.
All
rights
reserved.
No
part
of
this
publication
may
be
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
ViewSonic
is
a
registered
trademark
of
ViewSonic
Corporation.
All
other
trademarks
used
within
this
document
are
the
property of
their
respective
owners.
Revision History
|Revision|
Date
|
Description
Of
Changes
Approval
17700
0
2.0
2/18/00
Updated
&
Corrected
Adjustment
T.
Sears
Procedure
ii PJ860-2 Service Manual

TABLE OF CONTENTS
SERVICE WARNING o.cciajsesssesescossntovivonssiossscocssocbenacatscdesusssvorsosssesacecvbdcsvoenscdssssbesneeestebesshcsseesvarsedavensdiossesesse 1
Ji FEATURES cissscssssocsisissssesssssssssnivsstusscsevossedentevessoitescecesesctessaatuctasssdacscscatebcosedeldsatcielecesoensaceeseedvevebasseavatiessiese 2
2. SPECIFICATIONS ocscssosossassseesseonvsvvevessasoessbsnveseiecevenssensubeducessdesedsdesésesovssensarsiveshieseeniisianierovecssscessorsdesvoosoy 2
3.NAMES: OF EACH PART ssscccccccsssossssesoscecsecsosscssecacsconsisasosonucesvovsarorsesssescestvedssedsevesorssoseneadesesesssaeucebvacebisesa 3-8
A, ADJUSTMENT ssssscseocsocossoscscsoisonsoicsssesltnsesessesste aussassesedossveseessoressacosnescnsoaticacs dutncattiesedesbedvasossvdceosesesebatesecs 9~12
5. TROUBLESHOOTING .......csssssssssosssssesssssersssessrovnseressecassecssessssavscssesecesovesscnsnsesacssusesssesaseacorararaceseseseseacers 10~20
6. SERVICE PARTS REPLACEMENT CAUTIONG.........sssccccssssssssosesssscsesscsssecsssssecassssecsccessnecossasaracseeerese 21
Té BLOCK DIAGRAM piiccccsccscsssscsossciessscsstesocedasiscsconniesasssevossvenceetereeresoendossoiovensesascescssesestocesssasceseseiséeonesosseeate 22
8. WIRING DIAGRAMG...........ccscscscssssonsnsecerssesnassensvensosonscecsseenssssesssesesecscnssensonscasssnsscnsosusensssasacnenesssseseacocass 23~24
9. CIRCUIT DIAGRAMG...........cccossssssessssessereoser saceesscesccncsncesrsceocenenseasaceesnseeceosecsseeseosessecessecoesse senevencsessecesee we25S—~O1
10. INTERCONNECTION DIAGRAM ..........ccsse00 escsacssoenenerssnsensensnscnscosscraracsonecsscesssseossctesseoneseceesenseasasoneves 62
11. EXPLODED PARTS VIEW........ccssscsssceccosvcerssesesesensesasassssvesscssaserscssereseresusesnsssscossesaseosases sactacssenessoresens --63—~64
12. REPLACEMENT PARTS LIST. ..........scccscsscscsssssesscensesecsssessoeseosssesssensnsnscasssessesecessonscasenseensnasacesessacssreres 65
Haan ee es ee Le Ea ES ee
iii PJ860-2 Service Manal

-MEMO-

~ SERVICE MANUAL eiveacia
ya
Caution - -
Be sure to read this manual before attempting to service this product. This ViewSonic liquid crystal projector
is designed to provide protection from fire, electric shock, physical injury, harmful radiation, and materials.
It is important to read and follow all cautionary warnings mentioned in this manual.
Service Warning
The
lamp
can
be
extremely
HOT.
Be
careful
to
avoid
burning
your
fingers
when
replacing
the
lamp.
Never
touch
the
lamp
bulb.
Dropping
it
or
giving
it
a
shock
may
cause
the
lamp
to
burst.
High
voltage
is
present
in
the
projector
for
the
lamp
circuit,
so
do
not
touch
the
electrical
parts
of
the power unit when the projector is powered on.
s
Do
not
touch
the
exhaust
fan
during
operation.
”
The
LCD
module
assembly
is
easily
damaged.
When
replacing
the
LCD
Module
assembly,
never
handle
the attached flexible ribbon cable.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
pres c cee ecw ene eee etree ee eee ene

1. Features
» High brightness, High resolution
> Compact size, light weight for portability
> RGB output terminal
» RS232C Communication
> Mouse emulation
» Power zoom and power focus functions
>» Complies with VESA DDC1/2B specifications
> Auto-adjustment function
2. Specifications
om LDive system TFT active matrix
panel
Number of pixels {| 800 (H) x 600 (V)
‘BOW UAB
NTSC , 4.43NTSC , PAL , M-PAL , or SECAM (N-PAL : only compulsion mode)
Composite 1.0Vp-p (75Q termination)
Video input teae Y/C Y : 1.0Vp-p (75Q termination)
C : 0.286Vp-p (NTSC burst signal, 75Q termination)
0.3Vp-p (PAL/SECAM burst signal, 75Q termination)
. R Analog RGB input
Vv
0.7Vp-p (75Q termination)
H/V separate
ignal
200mVrms, 20kQ or less
Audio
Output ___| 0-200mvims, 1K
Speaker output 1.2W + 1.2W (stereo)
Power supply AC100~120V/3.7A,AC220~240V/1.5A
320W
289 (W) x 124 (H) x45 (0) mm
Weight 5.9kg (13ibs)
T iarsieane Operation :0~35°C
RINRE DA Sscrene Storage : -20~60°C
REMOtE CONTLOL ose rerrseerseessessserresesesreecere RGB Cables -.:-:cccsssserecnrensssserssecensessenn
Accessories
RGB input /
output
POWER cord --....-«-- 3(CP-S860W) Mac adapter ve
2(CP-S860E) VIdEO/AUGIO CADIS -vsercssssssssssccseneesssen 1
BATTERIES LRG covsssssssscssssesecrseesecsersennes MOUSE CADIG -vscrecssssstsscctcstscsneetenseessione
ame
ViewSonic Corporation BO ee ee PJ860-2

3. Names of each part
@ Main unit
#¢ FOCUS button
Used to adjust the focus of the image on
the screen.
INPUT button
Press this button to switch the input. The
input changes in the following sequence
ZOOM button
Used to adjust the size of the image.
MUTE button Eee ene each time this button is pressed.
This button turns the sound on and RGB1—» RGB2 — VIDEO
off. Press once to turn the sound off; fe ee
then press again to turn the sound
back on. MENU button
Displays the image menu.
STANDBY / ON button
Press this button to turn the power
on and off. When turned off, the
projector enters standby status.
““ RESET button
Used to reset the initial settings.
* TEMP indicator
This indicator lights or blinks when the
internal temperature of the projector
rises and when the fan malfunctions.
LAMP indicator sass
This. lamp lights or blinks when the
lamp is off.
ON indicator seamen
This indicator lights or blinks during
standby and during operation.
Speaker
Speaker
Remote control
photoreceptor
« Cooling fan
Lens (exhaust side)
Lens
cap
«
Handle
* Cooling fan
{intake side)
* Use the remote control in front of the remote control photoreceptor at a distance
of about 5 m or less and an angle of 30 degrees to the left or right of the center.
|
ll
a
a
-3-
:
Confidential
-
Do
Not
Copy
:
PJ860-2
~
ViewSonic
Corporation
_

Remote control photoreceptor
Main power switch :
Used to turn the power on and off.
© : OFF
| : ON
AC IN jack ¢
Used to connect the accessory power cord.
Connecting to the AC IN jack VIDEO IN jack
Make sure the accessory power cord is plugged into meee wale Kois eoeneciws
the AC IN jack as far as it will go. Incomplete VIDEO IN jack é .
connection can result in fire or electrical shock. RCA jack
AUDIO L/R IN jack
RCA jack
RGB IN jack =
D-sub 15-pin shrink (1/2)
CONTROL jack sssenesmfasceneonhes el Sell Qa.
D-sub 15-pin shrink
USB jack \
The mouse cursor can be controlled by %
AUDIO IN jack %
Stereo mini-pin jack remote control by connecting to a RGB OUT jack
personal computer. D-sub 15-pin shrink
AUDIO OUT jack (RGB/VIDEO)
Stereo mini-pin jack
Pe
_ViewSon ic Corporation -4-— : Confidential - Do Not Copy :
PJ860-2
b= 2.4

@ Remote control transmitter
mente TT
VIDEO,
RGB
button
er
ceil
:
Press
to
switch
the
input.
STANDBY / ON button
Used to turn the power on and off.
Press for 1 sec. or more to turn the power off
(enter standby status).
DISK PAD
(1) Used to select menu items when the menu
screen is displayed
(2) When the menu is not displayed, the mouse
shift function and left click function are active.
(3) After the POSITION ON button has been
pressed, the screen can be moved upward,
downward and to the left and right.
MENU button
Used to turn the menu screen display on and off.
MAGNIFY button
Used to magnify the displayed image.
Pin P button
Used to turn Pin P (Picture In Picture:
displays small video signal images in the
RGB signal) on and off.
BLANK button
Used to turn blanking on and off.
FOCUS button :
Used to adjust the focus of the image on the
screen.
LASER button
Turns the laser beam on and off.
POSITION button
Pressing the top, bottom, left or right of Disk Pad
after pressing this button causes corresponding
movement (effective only for RGB signal output).
RESET MOUSE / RIGHT button
Operates as the RESET button when the menu
is displayed. Press this button to return to the
initial settings.
Used to click the right mouse button when the
menu is not displayed.
‘\ FREEZE button
Used to turn the freeze (still) image display on
and off.
* VOLUME button
Adjusts the volume of the sound. Press [ A] to
increase the volume and ( \v ) to decrease the
volume.
MUTE button
Mutes the sound when pressed and restores the
sound when pressed again.
TIMER button
Turns the time display of the timer displayed on
the menu screen on and off.
The timer is not displayed during blanking.
*ZOOM button
Used to adjust the size of the image.
« AUTO button
Used to execute auto-adjust.
CAUTION
LASER RADIATION.
* DO NOT STARE INTO BEAM
WAVE LENGTH.650nm
MAX OUTPUT.1mW
CLASS 2 LASER PRODUCT
AVOID EXPOSURE-
LASER RADIATION iS
EMITTED FROM THIS
APERTURE
ViewSonic Corporation _

Function for service |
: ere Press the RESET button of the projector or the TIMER
Displayed the operating time of the lamp button of the remote control, for 3 seconds.
Press the RESET button of the projector or the remote
Reset the operating time of the lamp control MENU, for 3 seconds.
(During be displayed the operating time of the lamp.)
Press the MUTE button of the projector or the remote
Displayed the operating time of the projector control, for 3 seconds.
(During be displayed the operating time of the lamp.)
When replacing the lamp, Reset the operating time of lamp.
Reset the lamp timer :
Please carry out the following operation within 10 minutes from power on, if you replaced the lamp after 2,000 hours.
2 3
OIBIOIO®
(1 )
@ pea
aduy ay O3GIA
C)
1) Press the RESET button on projector for 3 seconds or remote
control TIMER button for 3 seconds and display the total lamp
used time. LAMP 1700 hr
2) Press the RESET button on projector or remote control MENU
ON button during displaying the lamp used time. LAMP 1700 C0 CANCEL
3) Select the "0" on the screen using the MENU (@)) button or
DISK PAD.
ee ee a)
;
ViewSonic Corporation —6— |, Confidential - Do Not Copy PJ860-2

Message table
On-screen display
The following messages are displayed on the screen.
"CHANGE THE LAMP"
"AFTER
REPLACING
LAMP,
RESET
|Lamp
has
1,700
hours
on
it
and
may
need
to
be
changed.
THE LAMP TIMER"
"CHANGE THE LAMP"
“AFTER REPLACING LAMP,
Lamp has 1,979 h it.
eee Te EINE cap es Ae ee
"THE POWER WILL TURN OFF
AFTER 20 Hr.
Blinking of "CHANGE THE LAMP"
“AFTER REPLACING LAMP,
RESET THE LAMP TIMER"
"THE POWER WILL TURN OFF
AFTER 0 Hr."
"NO INPUT IS DETECTED" Signal is not input.
hori F : ;
“SYNC
IS
OUT
OF
RANGE"
The
onze
or
vertical
fequency
of
the
input
signal
exceeds
the
range
of
the projector, it cannot be displayed.
When
the
lamp
has
2,000
hours
or
more
on
it,
the
message
will
blink,
and
the
power
will
turns
off
after
10
minutes.
__ViewSonic
Corporation
-7-
Gi
sa
Salas
clad
Salahia
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_
Indicator display
The ON indicator, LAMP indicator and TEMP indicator will light or blink in the following cases.
[ON indicator [LAMP indicator] TEMP indicator] Meaning
[Ssansbymese |
[Buingwamingp |
[tien eon | Goes | Goosof | During operaion ‘| __————_
If the indicator is still lit, lamp
Lights red Lights red Goes off
may be defective. Replace.
Lights red Blinks red Lamp is not inserted Securely insert the lamp.
Lights red Blinks red Cooling fan accidented Replace fan.
. Accumulated lamp operation Replace lamp and reset the
Blinks red Blinks red Goes off time has exceeded 2,000 accumulated lamp operation
hours time.
When inside temperature becomes high, to protect the projector, the lamp may be turned off and the lamp
indicator lights red, or the projector will be shut down and the all indicator display goes off.
Cool projector by power off for
60 minutes.
Lamp cannot light
ee
dl a
_ViewSonic Corporation a che eben eee Te _PJ860-2

4,
Adjustment
(Timing
should
be
set
to
800
X
600
X
60Hz
when
performing
the
following
adjustments)
4-1 Before adjusting
1. Before starting adjustment, warm up the projector
for about 10 min.
2. Set Zoom Wide to Max. and project an image a
distance of 40 inches.
3. Normalizing the video adjustment.
(Press the MENU button of the remote controller to
display the Video menu, then press the RESET
button.)
4-2 S/H timing adjustment
Adjustment preparations
1. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p cross hatch signal.
2. Use H.PHASE in the Video menu to adjust until the
cross hatch vertical stripes are most clearly visible.
3. Reset S/H.
Position the cursor on S/H in the Adjustment Menu
and then press the RESET key.
4-3 SUB POSITION adjustment
Adjustment preparations
1.Make this adjustment after completing the
adjustment in "4-2 S/H Timing adjustment".
2. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p cross hatch signal.
3. Press the AUTO button of the remote controller.
Required adjustments after a part is replaced
Adjustment at replacement
eluatinertt
siting] x | Need | Need |
[Sub position | _x___| Need | Need _
(Ghost____| Need _| Need | Need
[Flicker | Need | Need | Need
NRSH [Need | Need | Need
White balance | Need | Need_| Need |
[Color uniformit | Need | Need_| Need _|
ViewSonic Corporation
4. Perform all adjustments from the Adjustment menu.
Perform the following operations to display the
Adjustment menu.
a.Press the MENU button of the remote controller
(the Video menu will appear).
b.Next, press the RESET button for 5 sec. or
more (the Adjustment menu will appear).
Adjustment procedure
1. Use S/H - S/H Timing in the Adjustment menu to
adjust until the cross hatch vertical stripes are most
clearly visible.
2. Next, check whether or not vertical jitter is within
the range of -16 < A < +16 at the value resulting
from the adjustment in item 1.
3. If there is jitter, change S/H - S/H POL in the
Adjustment menu (change NEGA to POSI and
POSI to NEGA).
4. Finally, return S/H - S/H TIMING in the asian
menu to the value in item 1.
Adjustment procedure
1. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p frame signal.
2. Use S/H - SUB POSITION in the Adjustment menu
to adjust so that the left and right frames are
displayed.
Caution: The frame is displayed in three steps at
this stage, but adjust to the center step;
otherwise, colors may appear in the
vertical stripes in some cases.
PJ860-2

a
4-4 Ghost adjustment
Adjustment preparations
1. Make this adjustment after completing the
adjustment in “4-3 SUB POSITION adjustment”.
2. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p cross hatch signal.
3. Use H.PHASE in the Video menu to adjust until the
cross hatch vertical stripes are most clearly visible.
4-5 Flicker adjustment (V.COM adjustment)
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-4 Ghost adjustment.
2. Use the SVGA VESA (60) timing signal to input a
0.35Vp-p R primary color signal for every other line.
3. Use DAC-P - V.COM - R: in the Adjustment menu
to adjust until flicker is minimum.
4. Use the SVGA VESA (60) timing signal to input a
0.35Vp-p G primary color signal for every other line.
4-6 NRSH adjustment (vertical streak adjustment)
Adjustment procedure
1.Make this adjustment after completing the
adjustment in 4-5 Flicker adjustment.
2. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p 16-step gray scale signal.
3. Use DAC-P - NRSH in the Adjustment menu to adjust
until vertical streaks are minimum every 6 dots or
every 12 dots.
(This adjustment will change the flicker level so
always adjust the flicker after making this adjustment.)
Adjustment procedure
1. Display the R primary color signal and then use
S/H - GHOST-R: in the Adjustment menu to adjust
so that R color ghost is at a minimum.
2. (If ghosts appear on the right side of the vertical
stripes because the adjustment value is too large,
return two steps.)
3. In the same way, display the G primary color signal
and then use S/H - GHOST-G: in the Adjustment
menu to adjust so that G color ghost is at a minimum.
4. In the same way, display the B primary color signal
and then use S/H - GHOST B: in the Adjustment
menu to adjust so that B color ghost is at a minimum.
5. Use DAC-P - V.COM - G: in the Adjustment menu
to adjust until flicker is minimum.
6. Use the SVGA VESA (60) timing signal to input a
0.35Vp-p B primary color signal for every other line.
7. Use DAC-P - V.COM - B: in the Adjustment menu
to adjust until flicker is minimum.
4. Then vertical streaks is still displayed, use S/H-S/H
Timing in the Adjustment menu to adjust until
vertical streaks are minimum.
Adjust for minimum flicker
ViewSonic Corporation
—-10-—
(50% signal level)
PJ860-2

4-7 White balance adjustment
Adjustment procedure
1.Make this adjustment after completing the
adjustment in 4-6 NRSH adjustment.
2. Use the SVGA VESA (60) timing signal to input a
0.7Vp-p 16-step G primary color signal.
3. Use DAC-P - SUB BRIGHT - G: and DAC-P - SUB
CONTRAST - G: in the Adjustment menu to adjust
to the optimum 16-step shading characteristics
(visually).
Adjustment hints:
Lock DAC-P - SUB CONTRAST - G: at 30. Also lock
DAC-P - BLACK2-GAIN - G: at 32.
Use SUB BRIGHT - G: to adjust until the last two of the
16 steps on the bright side can no longer be
distinguished and then retum slightly.
After adjusting, if contrast is thought to be insufficient,
use DAC-P - SUB CONTRAST - G: to slightly increase
the contrast and then readjust.
To lower only the black level, adjust BLACK2-GAIN - G:.
4. Switch to a 0.21Vp-p white signal.
5. Use DAC-P - SUB BRIGHT - R: and DAC-P - SUB
BRIGHT _ - B: in the Adjustment menu to adjust
until the color coordinates in the center of the
screen are as follows.
X = 0.280 £0.005, Y = 0.340 £0.01 (low brightness
white balance).
4-8 Color uniformity adjustment
Adjustment preparations
1.Make this adjustment after completing the
adjustment in 4-7 "White balance adjustment”.
2. Reset color uniformity correction. -
Position the cursor on C.UNIF in the Adjustment Menu
and then press the RESET key for each color.
3. This adjustment is used to assure color uniformity
over the entire screen by adjusting in sequence the
white balance of each of the 33 points shown in the
diagram below, starting with the smallest signal.
4. Do not adjust adjustment point No. 1 because, as
with DAC-P - SUB BRIGHT in the Adjustment
Menu, the brightness of the entire screen will be
changed.
Basically, only adjustment points No. 2 and No. 3
can be adjusted for the color green (G).
dy
6.
7.
_—
Switch to a 0.52Vp-p white signal.
Use DAC-P - SUB BRIGHT - R: and DAC-P - SUB
CONTRAST - B: in the Adjustment menu to adjust
until the color coordinates in the center of the
screen are as follows.
X = 0.280 +0.005, Y = 0.345 £0.01 (low brightness
white balance).
. Repeat the operations described in items (4) - (7)
and adjust the low brightness and medium
brightness white balance.
. Next, switch to a 0.07Vp-p white signal.
10.
Use DAC-P - BLACK2 GAIN - R: and DAC-P -
BLACK2 GAIN - B: in the Adjustment menu to
adjust until the color coordinates in the center of
the screen are as follows.
X = 0.270 £0.03, Y = 0.320 £0.03 (black white
balance).
Note:
Use the Minolta CL-100, Color Differential Meter for
measurements and adjustments.
Representative adjustment points
:
Confidential
-
Do
Not
Copy
:
Representative
adjustment
pdms
No.
eee mee mmc mem crm c er ececccnccs
ViewSonic
Corporation
aes
PJ860-2

eel
Adjustment procedure
1. Use the SVGA VESA (60) timing signal to input a
0.35Vp-p G primary color signal.
2. Measure the illumination at adjustment points No. 2
and No. 3.
The values should be:
No. 2 = Y2 [lux]
No. 3 = Y3 [lux]
3. Determine which of the No. 2 or No. 3 adjustment
point has the higher illumination and then adjust it
to match the one with the lower illumination.
For example, if Y2 > Y3, adjust No. 2 G: to set the
No. 2 illumination as follows.
Y2=Y32+10 [Ix]
This completes the G color adjustment.
4. Next, use the SVGA VESA (60) timing signal to
input a 0.35Vp-p G white signal.
5. Measure and make a note of the color coordinates
of adjustment point No. 1.
The values should be: x = x1, y = y1
Note:
When using the CL-100 (Color Differential Meter), it
is convenient to use the Delta mode. After
measuring the color coordinates of adjustment
point No. 1, hold down the [F] button on the front
and set the slide switch on the side to [A] Delta.
After that, the differences from adjustment point
No. 1 will be displayed as the measurement values.
ViewSonic Corporation
6. Next, measure the color coordinates of adjustment
point No. 2, and then adjust No. 2 A: and B: until
the color coordinates are as follows.
x = X1+0.01 , y = y1 £0.01 (ANSI point color
uniformity)
7. Measure and adjust the color coordinates of
adjustment points No. 3 - No. 9 in sequence in the
same way, Starting with the smallest signal.
8. Next, measure the color coordinates of adjustment
point No. 10, and then adjust No. 10 A: and B: until
the color coordinates are as follows.
x = x1+0.01, y = y1 £0.02 (corner color
uniformity)
9. Measure and adjust the color coordinates of
adjustment points No. 11 - No. 17 in sequence in
the same way, starting with the smallest signal.
10. This completes the normal color uniformity
adjustment. Adjust visually if local lack of color
uniformity still remains around the periphery of the
screen.
11. If there is local lack of color uniformity around the .
periphery of the screen, adjust the color
coordinates of adjustment point No. 18 - No. 21
outside the worst side of the screen.
12. lf there is local lack of color uniformity in the
corners of the screen, adjust the color coordinates
of adjustment point No. 22 - No. 33 outside the
worst corner of the screen.
eee wwe mee eee e emer cere ne nnane
PJ860-2

5. Troubleshooting
Check points at trouble shooting
PWB ass'y input
terminal video
EVS1
TERMINAL PANEL
PROJECTION
LENS
i-
CHK0082
HK00
© cuKooas |
giikooss
GhKo044
PWB ass'y MAIN CHK0038
K0039
ocHko042
© cHK0040
Le oe
|
I
|
I
|
|
|
< Top view without upper case >
Connectors on the back side of PWB
ass’y MAIN are drawn by dotted line.
MiewSonic
Corporation
_
=-138—
i.
Contcetii
ets
Lape’
aa
PJ860-2
|
=

Power can not be turned on
voltage input at
pins@®, @,@of EDS1
on the PWB ass'y main
@ : (CHKO082) :+12.5V
@ : (CHK0041) :+6.6V
© : (CHK0043) :+17.0V
voltage at pin@of
EDI1 on the PWB ass'y
main at standby
mode.
PWB ass'y main
_
ViewSonic
Corporation
.
CHK0023 = L
® : (CHK0023) = H (H = 2.5V)
on?
PWB ass'y TEMPERATURE
. Disconnect
ETEP form PWB ass'y
main. And retry turn
Power unit (circuit) PWB assy FILTER
PWB ass'y main
PJ860-2

Lamp does not light ~
Is
the
Lamp
cover
Blinks
Set
the
Lamp
cover
ga
OK
—_
NG
Is
the
Lamp
Set
the
Lamp
again
<oniacuon?
OK
between
@
and
baal
OK-©
of
ELC1
on
the
PWB
)
ass'y
main.
And
check
again
LIMIT
SWITCH
(LAMP
DOOR)
ae
(More
than
12.5V)
OK
voltage
at
the
round
PWB
ass'y
main
CHKO0082
on
the
PWB
ass'y
main
at
stand-by
mode.
NG
Blinks
Power unit (Circuit)
DC FAN (LAMP)
DC FAN (EXHAUSTION)
DC FAN (INTAKE)
_ ViewSonic Corporation
between ® and
@ of ELMF on the PWB
ass'y main and
retry.
Is
Retry
after shorting
between@and @of
EBAF on the PWB
ass'y main.
Short
between © and
® of EINF on the PWB
ass'y main and
retry.
PWB ass'y main
~15-—
What is the state of
during operation?
What is the state of
TEMP indicator?
on the PWB ass'y
main set to "H"?
Light
LAMP indicator sont
Not light
Change the iamp.
Does Lamp light?
Light
Lamp
Not light
pin © of EBAR No
ear PWB ass'y main
Power unit (ballast)
Not light
Power unit (ballast)
To pe

Picture is not displayed only
when the RGB signal is input
Check at operating mode
Is
picture
displayed either
selected RGB1 or
RGB2?
YES
Is the
1/2 selected
signal changed at pin @
(CHK007) of EDI1 on
the PWB ass'y
PWB ass'y main
YES
“L"=RGB1, "H"=RGB2
("H'=5V)
PWB ass'y input terminal RGB
YE
S PWB ass'y main
Ms Q: (eeKoss} :R signal
@: (CHK0035) : G signal
@, @: (CHK0037) : B signal
®@ : eet : H syne
i) CHKO011) : V sync
NO
NO
Are signal
input at each pin of
EDI1 on the PWB
ass'y main?
NO
: PWB ass'y input Power unit
ViewSonic
Corporation
ie
ee.
Pig60-2