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XL795D
Service Manual
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TABLE OF CONTENTS
SERVICE WARNING·················································3
A. IMPORTANT SAFETY INSTRUCTION·····················3
B. SPECIFICATIONS·········································4
C. TIMING CHART······································5
D. CONTROL LOCATION·································7
E. CONDUCTION VIEW········································8
F. ADJUSTMENT PROCEDURE·······························11
G. TROUBLE SHOOTING HINTS ···························12
H. REPLACEMENT PARTS LIST···························16
I. BLOCK DIAGRAM ······································28
J. SCHEMATIC DIAGRAM ································29
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WARNING
To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is
inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified monitor
engineer.Contact the local dealer or the nearest Xerox branch office if you need help.
A. IMPORTANT SAFETY INSTRUCTION
Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the
user's manual for this product.
1. Read all of these instructions.
2. Save these instructions.
3. Follow all warnings and instructions a marked on the product.
4. Unplug this product from the wall outlet before cleaning.Do not use liquid cleaners or aerosol
cleaners, use a damp cloth for cleaning.
5. Do not use this product near water.
6. Do not place this product on an unstable cart,stand or tablle.The product may fall,causing serious
damage to the product.
7. Slots and openings in the cabinet and the back or bottom are provided for ventilation,to ensure
reliable operation of the product and to protect it from overheating,those openings must not be
blocked or covered.The openings should never be blocked by placing the product on a bed,sofa, rug,
or other similar surface.This product should not be placed in a built-in installation less proper
ventilation is provided.
8. This products should be operated from the type of power source indicated on the marketin label.
If you are not sure of the type of power available, consult your dealer or local power company
9. This product is equipped with a 3-wire grounding type plug,a plug having a third (grounding)
pin.This plug will only fit into a grounding-type power outlet.This is a safety feature,if you are
unable to insert the plug into the outlet,contact your electrician to replace your obsolete outlet.Do
not defeat the purpose of the grounding-type plug.
10. Do not allow anything to rest on the power cord.Do not locate this product where persons will walk
on the cord.
11. If an extension cord is used with this product,make sure that the total of the ampere ratings on the
product plugged into the extension cord to the waplugged into outlet does not exceed 15 ampere.
12. Never push objects of any kind into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock.Never spill liquid
of any kind on the product.
13. Do not attempt to service this product yourself,as opening or removing covers may expose you to
dangerous voltage points or other risks.Refer all servicing to service personnel.
14. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions.
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally,when the operating instructions are followed.Adjust
only those controls that are covered by the operating instructions since improper adjustment of
other controls may result in damage and will often require extension work by a qualified
technician to restore the product to normal operation.
e. If the product has been dropped or the cabinet has been damaged.
f. If the product exhibits a distinct change in performance,indicating a need for service.
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B. SPECIFICATIONS
1. Maximum Resolution 1280 x 1024 @ 75Hz
2. Recommend Resolution 1280 x 1024 @ 60Hz
3. Synchronization Range
Horizontal
Vertical
31 – 80 KHz
60– 75 Hz
4. Active Display Area 376mm (H) x 301mm (V)
5. Dot Pitch 0.294(H) x 0.294(V) mm
6. Support display colors 16.7M color
7. Contrast Ratio (Typical) 600
8.Luminance of White 250cd/m²
9. Bandwidth 135MHz
10. User Control 4 Key Switch
11. OSD Function Brightness, Conrast, H-Pos, V-Pos, H. Size, Phase, Color Select,
Auto, Reset, Language, OSD Adjust, Exit
12. View Angle CR=5
Horizontal
Vertical
85 , 85 Degrees
85 , 85 Degrees
13. Power Source 100 – 240 Vac 60 / 50 Hz
14. Power Consumption 60W (max.)
15. Connection Type 15 Pin D Type / DVI
16. Input Signal
Video
Sync.
Analog R.G.B. , 0.7Vp-p / 75 Ohms
TTL level,positive or negative polarity
17. Color Temperature Cool / Natural / Warm
18. Dimension (WxHxD) Packing
Set
484mm x 500mm x 150mm
420mm x 428mm x 170mm
19. Monitor Weight 7.3Kg / 6.1Kg
20. Base Operation
Tilt
0 / + 15 degree
21. Power Saving
ON
STAND BY
OFF
＜ 60W
＜ 5W
＜ 5W
22. Signal Connector Pin Assignment
Pin No.
1. Red 9. VDD from PC for DDC
2. Green 10. Sync. Ground
3. Blue 11. Ground
4. Ground 12. SDA (For DDC)
5. Self Test 13. Horizontal Sync.
6. Red Ground 14. Vertical Sync.
7. Green Ground 15. SCL (For DDC)
8. Blue Ground
23. Audio signal 3.5F stereo phone jack
2.5+2.5W 8O Speaker
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C.TIMING CHART
Video
Back porch Active display Front porch
Sync.
Sync-width
Total
Preset
Modes
VGA
720X400
VGA
640X480
VESA
640X480
VESA
640X480
VESA
800X600
VESA
800X600
VESA
800X600
Pixel clock
(MHz)
28.325 25.175 31.500 31.500 36.000 40.000 50.000
H-Frequency (KHz)
31.472 31.469 37.861 37.500 35.156 37.879 48.077
H-Total (µ
s)
31.774 31.778 26.413 26.667 28.444 26.400 20.800
H-Active Display
(µs)
25.419 25.422 20.317 20.317 22.222 20.000 16.000
H-Blanking
(µs)
6.355 6.356 6.095 6.349 6.222 6.400 4.800
Front Porch
(µs)
0.635 0.636 0.762 0.508 0.667 1.000 1.120
H-Sync-width (µs)
3.813 3.813 1.270 2.032 2.000 3.200 2.400
H-Back Porch
(µs)
1.906 1.907 4.063 3.810 3.556 2.200 1.280
V-Frequency
(Hz)
70.1 59.94 72.81 75.0 56.25 60.3 72.2
V-Total
(ms)
14.267 16.683 13.735 13.333 17.778 16.579 13.853
V-Active Display
(ms)
12.710 15.253 12.678 12.800 17.067 15.840 12.480
V-Blanking
(ms)
1.557 1.430 1.057 0.533 0.711 0.739 1.373
V-Front Porch (ms)
0.413 0.318 0.238 0.027 0.028 0.026 0.770
V-Sync-width (ms)
0.064 0.064 0.079 0.080 0.057 0.106 0.125
V-Back Porch (ms)
1.080 1.049 0.740 0.427 0.626 0.607 0.478
H/V Sync. Polarity
－ ＋ － － － － － － ＋ ＋ ＋ ＋ ＋ ＋
Interlace
NONE NONE NONE NONE NONE NONE
NONE
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Preset
Modes
VESA
800X600
VESA
1024X768
VESA
1024X768
VESA
1024X768
VESA
1280X1024
VESA
1280X1024
Pixel clock
(MHz)
49.500 65.000 75.000 78.750 108.00 135.00
H-Frequency (KHz)
46.875 48.363 56.476 60.023 63.981 79.976
H-
Total (µs)
21.333 20.677 17.707 16.660 15.630 12.540
H-Active Display (µs)
16.162 15.754 13.563 13.003 11.852 9.481
H-Blanking
(µs)
5.172 4.923 4.053 3.657 3.778 3.022
Front Porch
(µs)
0.323 0.369 0.320 0.203 0.444 0.119
H-Sync-width (µs)
1.616 2.092 1.813 1.219 1.037 1.067
H-Back Porch (µs)
3.232 2.462 1.920 2.235 2.296 1.837
V-Frequency (Hz)
75.0 60.0 70.1 75.0 60.0 75.0
V-Total (ms)
13.333 16.666 14.272 13.328 16.661 13.329
V-Active Display (ms)
12.800 15.880 13.599 12.795 16.005 12.804
V-Blanking (ms)
0.533 0.786 0.673 0.533 0.656 0.525
V-Front Porch (ms)
0.021 0.062 0.053 0.017 0.016 0.013
V-Sync-width (ms)
0.064 0.124 0.106 0.050 0.047 0.038
V-Back Porch (ms)
0.448 0.600 0.513 0.466 0.594 0.475
H/V Sync. Polarity
＋ ＋ － － － － ＋ ＋
＋ ＋ ＋ ＋
Interlace
NONE NONE NONE NONE NONE NONE
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D. CONTROL LOCATION
Font control panel
1. Menu button (MENU) 4. Auto button (AUTO)
2. Select button (DOWN) 5. Power button (POWER)
3. Select button (UP) 6. Power Indicator
Rear panel
The rear panel of the monitor includes 3 plug-in connectors. They are as follows:
1. One DC IN connector
2. Two VGA Signal (DVI / D-sub) IN connectors
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E. CONDUCTION VIEW
MAIN BOARD (Component Side)
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MAIN BOARD (Component Side)
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F. ADJUSTMENT PROCEDURE
ITEM
Program Menu.
﹟Test Meter
﹡Test Point
﹫Pattern
Operation
Check
Value
A
B+
Check
﹟Digital Voltmeter
﹡CN7
﹫Crosshatch Pattern
(31.5KHz,640x480)
1. Plug power cable into the adapter, check adapter
power indicator light up green.
2. Make sure the voltage of the power plug (CN7)
on the main PCB to the value shown at right.
12.0V
±0.2V
B
Power Saving
Check
﹟Wattmeter
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(31.5KHz,640x480)
1. Unplug the signal cable into the monitor.
2. Turn the power switch of the monitor ON.
3. Check monitor power indicator light up orange.
4. Make sure the wattmeter value shown at right.
5. OSD will be display “NO SIGNAL” Picture.
<
2.5W
C
Into Factory
mode
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(31.5KHz,640x480)
1. Hold ‹ key,then turn the power switch of the
monitor OFF.
2. Hold › key,then turn the power switch of the
monitor ON.
3. You can into factory adjustment mode.
D
Auto mode
Check
﹟PC or Pattern
generator
﹫Crosshatch Pattern
(1024x768/60Hz)
1. Press and relese the MENU knob to activate the
OSD menu.
2. Move the OSD to the AUTO function,press MENU
key auto adjuat display mode to its utmost
performance according to VGA setting.
3. In the event of the display image needs further
adjustment
E
White
Balance
Adjust
﹟
PC or Pattern
generator
﹫White Pattern
(1024x768/60Hz)
1. Move the OSD to the COLOR mode (AUTO COLOR).
2. set color is 9300°K using the OSD,Check the value
shown at right.
Y = 220±0.1FL x = 0.283±0.01 y = 0.297±0.01
3. set color is 7500°K using the OSD,Check the value
shown at right.
Y = 220±0.1FL x = 0.299±0.01 y = 0.315±0.01
4. set color is 6500°K using the OSD,Check the value
shown at right.
Y = 220±0.1FL x = 0.313±0.01 y = 0.329±0.01
F
OSD
Language
Setting
﹟
PC or Pattern
generator
1. Move the OSD to the LANGUAGE mode.
2. You can choose one of the eight language you need.
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