Hitachi CML176SXWB, CML176SXW Schematic

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety

Precautions” and “Product Safety Notices” in this service manual.

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité»

et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise

zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

SERVICE MANUAL

MANUEL D'ENTRETIEN

WARTUNGSHANDBUCH

Data contained within this Service

manual is subject to alteration for

improvement.

Les données fournies dans le présent

manuel d’entretien peuvent faire l’objet

de modifications en vue de perfectionner

le produit.

Die in diesem Wartungshandbuch

enthaltenen Spezifikationen können sich

zwecks Verbesserungen ändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

TFT LCD MONITOR

June 2005

No. 0536

CML176SXW

CML178SXWB

EP877/878 TFT LCD MONITOR CONTENTS

1. INTRODUCTION.......................................................................................................................... 4

1.1 Scope ....................................................................................................................................................................4

1.2 Description........................................................................................................................................................... 4

2. ELECTRICAL REQUIREMENTS ................................................................................................. 5

2.1 Standard Test Conditions........................................................................................................................................5

2.2 LCD monitor General specification .....................................................................................................................6

2.3 LCD Panel Specification........................................................................................................ .............................. 7

2.4 Input Signals....................................................................................................................................................... 12

Supported Timing........................................................................................................................................................13

2.5 CONTROLS........................................................................................................................................................15

2.6 White Color Temperature...................................................................................................................................17

2.7 POWER SUPPLY ...............................................................................................................................................18

2.8 Plug & Play(EDID)............................................................................................................................................19

2.9 Audio Technical specification (EP877 Only).....................................................................................................20

3. VL-750 DISPLAY CONTROL BOARD ....................................................................................... 21

3.1 Description......................................................................................................................................................... 21

3.2 Features..............................................................................................................................................................21

3.3 BLOCK DIAGRAM ............................................................................................................................................21

System Block Diagram................................................................................................................................................22

3.4 Connector Locations ..........................................................................................................................................22

3.5 Connector Type ..................................................................................................................................................24

3.6 Signal Pin & Description ...................................................................................................................................24

4. VK-723 Control Panel Board .....................................................................................................25

4.1 Description......................................................................................................................................................... 25

4.2 Connector and Switch Locations........................................................................................................................25

4.3 Connector type....................................................................................................................................................25

4.4 Connector pin Assignment..................................................................................................................................25

4.5 Switch definition.................................................................................................................................................25

4.6 LED definition....................................................................................................................................................25

5. POWER SUPPLY & INVERTER BOARD .................................................................................. 26

5.1 Description......................................................................................................................................................... 26

5.2 Power supply ( AC to DC section)......................................................................................................................26

5.3 Inverter (DC to AC Section)...............................................................................................................................27

5.4 Electrical characteristics....................................................................................................................................27

5.5 Connector locations............................................................................................................................................28

6. TROUBLESHOOTING ............................................................................................................... 30

6.1 Main Procedure.................................................................................................................................................. 30

7. MECHANICAL REQUIREMENTS .............................................................................................. 34

7.1 Vibration and Shock........................................................................................................................................... 34

7.2 Package Drop Specification...............................................................................................................................34

7.3 Dimension Size and Weight................................................................................................................................35

7.4 Gap Spec.............................................................................................................................................................35

7.5 Tilt Base Rotation...............................................................................................................................................36

7.6 Plastic Material..................................................................................................................................................36

7.7 GAP Spec............................................................................................................................................................ 37

8. POWER LINE TRANSIENT TEST (IEC 61000-4-4 FAST TRANSIENTS/BURST) ................... 38

8.1 Peak Voltage: .....................................................................................................................................................38

8.2 Polarity : + / - .............................................................................................................................................38

8.3 Repetition Frequency of the impulse : 5 KHz.....................................................................................................38

8.4 Rise-Time : 5ns

30% .....................................................................................................................................38

8.5 Impulse Duration: 50 nS

30%.........................................................................................................................38

8.6 Relation to Power Supply: Asynchronous..........................................................................................................38

8.7 Burst Duration: 15 ms

20% ............................................................................................................................38

8.8 Burst Period: 300 ms

20%..............................................................................................................................38

8.9 Climatic Conditions: ..........................................................................................................................................38

8.10 Test Procedure: ..................................................................................................................................................38

9. POWER LINE SURGE TEST (IEC 61000-4-5 SURGE) ............................................................ 40

9.1 Climatic Condition .............................................................................................................................................40

9.2 Test Conditions:..................................................................................................................................................40

9.3 .......................................................................................................................................................................40

9.4 .......................................................................................................................................................................40

9.5 .......................................................................................................................................................................40

9.6 .......................................................................................................................................................................40

9.7 Display set high-resolution mode, AC input use AC 240V.................................................................................40

10.ENVIRONMENT REQUIREMENT.............................................................................................. 41

10.1 Operating............................................................................................................................................................41

10.2 Storage or Shipment ...........................................................................................................................................41

11. REGULATION COMPLIANCE .................................................................................................. 42

11.1 This product complies with the most current revisions of following regulations:..............................................42

11.2 Electrostatics Discharge (ESD).......................................................................................................................... 43

12.QUALITY AND RELIABILITY..................................................................................................... 44

12.1 QUALITY ASSURANCE..................................................................................................................................... 44

12.2 RELIABILITY .....................................................................................................................................................44

Appendix A: PCBA ASSEMBLY...................................................................................................... 45

Appendix B: DISPLAY UNIT ASSEMBLY……………………………………………………............... 47

1. INTRODUCTION

1.1 Scope

This specification defines the requirements for the 17” MICRO-PROCESSOR based Multi-

mode supported high resolution color LCD monitor, This monitor can be directly connected

to general 15 pin D-sub VGA connector and DVI-D digital connector, eliminates the

requirement of optional special display card. It also supports VESA DPMS power

management and plug & play function. There is a build-in stereo audio amplifier with

volume control to drive a pair of speakers.

1.2 Description

The LCD monitor is designed with the latest LCD technology to provide a performance

oriented product with no radiation. This will alleviate the growing health concerns. It is also

a space saving design, allowing more desktop space and comparing to the traditional CRT

monitor, it consumes less power and gets less weight in addition MTBF target is 20K

hours or more.

Comparison Chart of EP877/EP878

CML176SXW CML178SXW B

Panel

Normal 17” panel

Hydis HT17E13-100-110

Normal 17” panel

Hydis HT17E13-100-110

Signal Interface DSUB+DVI-D DSUB+DVI-D

Sync Type for analog input Separate / compatible / Separate / compatible /

Color Temp user adjust

Support

DDC

DDC2B DDC2B

Speaker No 1W +1W

Headphone Jack No Yes

Microphone Jack No No

USB Hub Not supported Not supported

Tilt / Swivel Yes / No Yes / No

2. ELECTRICAL REQUIREMENTS

2.1 Standard Test Conditions

All tests shall be performed under the following conditions, unless otherwise specified.

Ambient light

: 225 lux

Viewing distance

: 50cm in front of LCD panel

Warrn up time

All specifications : 30 minutes

Fully functional : 5 seconds

Measuring Equipment

: Chroma 2250 signal generator or equivalent, directly

Connected to the monitor under test.

Minolta CA100 photometer, or equivalent

Control settings

User brightness control : Maximum (unless otherwise specified)

User contrast control : Typical (unless otherwise specified)

User red/white balance,

Green/white balance and

Blue/white balance control : In the center (unless otherwise specified )

Power input

: 110Vac or 220Vac

Ambient temperature : 20 ± 5˚C (68 ± 9˚F)

Analog input mode

:1280 x1024 /60Hz

2.1.1 MEASUREMENT SYSTEMS

The units of measure stated in this document are listed below:

1 gamma = 1 nano tesla

1 tesla = 10,000 gauss

cm = in x 2.54

lb = kg x 2.2

degrees F = [°C x 1.8] + 32

degrees C = [°F - 32]/1.8

u' = 4x/(-2x + 12y + 3)

v' = 9y/(-2x + 12y + 3)

x = (27u'/4)/[(9u'/2) - 12v' + 9]

y = (3v')/[(9u'/2) - 12v' + 9]

nits = cd/(m

) = Ft-L x 3.426

lux = foot-candle x 10.76

2.2 LCD monitor General specification

Panel Type : 17 “ active matrix color TFT LCD

HT17E13-100-110

Display size : 337.92mm (H) x 270.336mm (V)

Display mode : VGA 720 X 400 (70Hz)

VGA 640 X 480 (60/66/70/72/75Hz)

SVGA 800 X 600 (60/70/72/75Hz)

XGA 1024 X 768 (60/70/75Hz)

SXGA 1280 X 1024 (60/75Hz) standard resolution

Pixel pitch : 0.264mm(H) x 0.264mm(V)

Display Dot : 1280 x (RGB) x 1024

Contrast ratio:

= 0˚ 450:1 (Typ)

Brightness: 300 (Typ)

Response time ( Tr /Tf) : 16ms

Display color : 16.2M (6 bit color + FRC)

Viewing angle: CR>10 L / R : 75/75 (Typ)

U / D : 65/65 (Typ)

Luminance Uniformity : > 75% (minimum)

Pc interface: 1). Video : RGB analog 0.7V peak to peak

Sync : TTL positive or negative

2). Digital TMDS

Signal connector : 15 pin Mini D type, (standard VGA video)

DVI-D connector

3.5mm stereo audio jack (Audio) (EP877)

3.5mm miniature stereo Headphone jack (EP877)

Audio power : 1Wrms + 1Wrms ( 300Hz – 20kHz (S.P.L. – 10 dB))(EP877)

Front control : power on/off with LED select adjustment (+,-)

Interface frequency

Horizontal Frequency 24KHz -- 80KHz

Vertical Frequency <75Hz Typ : 60Hz

Plug & Play : Support VESA DDC2B functions

Power Input voltage : Single phase, 50/60HZ, 100VAC to 240VAC ±10%

Total output power : 48 Watt max.

2.3 LCD Panel Specification

2.3.1 LCD Panel Model ( HydisHT17E13-100-110 )

• Display Type active matrix color TFT LCD

• Resolution 1280 x 1024 pixels

• Display Dot 1280 x (RGB) x 1024

• Display Area 337.92mm(H) x 270.34mm(V)

• Pixel Pitch 0.264mm(H) x 0.264mm(V)

• Display Color 16.2M (6 bit color + FRC)

• Lamp Voltage 700Vrms (typ)

• Lamp Current 6.5 mArms ( typ)

• Weight 1900g ( typ)

• Optical Specifications

Specification

Item Symbol Condition

Min. Typ. Max.

Unit

Rema

Rising TR -

Response time

Falling T

= 0˚

12 16 ms -

Contrast Ratio CR

= 0˚

350 450 - -

Luminance of white YL

= 0˚

250 300 - Cd/m

White Uniformity

75 80 - % -

Wx 0.270

0.300

0.330

White Chromaticity

Wy 0.305

0.335

0.365

Rx 0.607

0.637

0.667

Red Chromaticity

Ry 0.317

0.347

0.377

Gx 0.246

0.276

0.306

Green Chromaticity

Gy 0.584

0.614

0.644

Bx 0.113

0.143

0.173

Blue Chromaticity

= 0˚

0.060

0.090

0.120

Up ΘU 60 65 - Deg.

Vertical

Viewing Angle

Down Θ

D 60 65 - Deg.

Left ΘL 70 75 - Deg.

Horizontal

Viewing Angle

Right Θ

CR>10

70 75 - Deg.

Cross talk C

- - 2.0 % C

Note 1) Definition of Viewing Angle: Viewing angle range (10≤CR)

Note 2) Definition of Contrast Ratio (CR): Ratio of gray max (Gmax), gray min (Gmin) at the

center point of panel.

Luminance with all pixels white (Gmax)

CR= 

Luminance with all pixels black (Gmin)

Note 3) Definition of Response time: Sum of T

, T

Note 4) After stabilizing and leaving the panel alone at a given temperature for 30 min, the

measurement should be executed. Measurement should be executed in a stable,

windless and dark room. 30 min after lighting the back-light. This should be

measured in the center of screen. Dual lamp current :13.0mA (6.5mA x2)(Refer to

note(1) on page 14 for more information).

Environment condition :Ta=25±2°C

Optical characteristics measurement setup

Notes 5) Definition of Luminance of White : measure the luminance of white at center point.

Notes 6)Definition of 9 points brightness uniformity (Measuring points: Refer to the Note 5)

Bmin

UNI

=100∗ 

Bmax

Bmax: Maximum brightness

Bmin: Minimum brightness

Notes 7) Definition of Flicker level

Flicker Voltage

F =  x 100 %

LMD Voltage

♦ One maximum value of three estimated values.

♦ For this test ,an LMD(Light Measurement Device)is needed with adequate response time

to track any visible rate flicker component and with a voltage level output proportional

To luminance intensity.

♦ Test Pattern: For dot inversion Driving(Gray levels of foreground dots on the test panel

Are G22,G32,and G45)

♦ Test Point :Center point of the display area

Note 8) Definition of Crosstalk (Refer to the VESA STD)

The calculation for shadowing is made from the 2 luminance measurements Gbkg and Lsh,

as follows:

Lmax - Lmin

=  x100 %

Lmin

Where Lmax is the larger value of Gbkg or Lsh , and Lmin is the smaller of the two.

♦ To determine background and foreground levels (colors),first set the background to any

gray scale or color level suitable for shadowing determination. (Note that it may take

several iterations of adjusting background level and box levels to determine the proper

value for the background. Next display the box levels to determine the proper value for the

background level. Look for shadowing in any direction from box E. Independently vary the

gray level (or color) of the background and box E until the worst case shadowing is

observed. This defines the background (Gbkg) and foreground (Gfg) levels to be

maintained for the remainder of the test.

♦ One point only (the target) will be measured. To determine that point proceed as follows

Using the background and foreground gray levels of step1 (Gbkg and Gfg). Turn on each

box at a time. Look for the case with the worst shadowing. The box causing the worst case

is the shadowing source, or Bsrc. Use Bsrc and the box opposite from it that lies directly in

the shadow path. That is the target box, or Btgt. Note that box Eight be either Bsrc or Btgt,

depending on the shadowing conditions, but typically Bsrc and Btgt will be a pair of

opposite boxes, A&C or B&D. Btgt will only be displayed for aligning the LMD. It will be

turned off for the actual measurement.

♦ The target box point (Btgt) will be measured with the source box (Bsrc) turned on then off.

(Btgt is for alignment purpose only) Display the background only at level Gbkg. Display

Btgt determined in step 2 above. Using the correct distance, angle, and measurement

aperture, align the LMD to the center of the Btgt. Turn off Btgt. With Gbkg set to its proper

level, measure the luminance (or color). Next,turn on the source box Bsrc. Again measure

at the center point of Btgt (without Btgt present.). In this case the LMD will be measuring

the shadowing level, Lsh.

2.4 Input Signals

2.4.1

2.4.2

2.4.3

Video input

• Type Digital / Analog R, G, B.

• Input Impedance 75 ohm +/- 2%

• Polarity Positive

• Amplitude 0 - 0.7 +/- 0.05 Vp

• Display Color same as LCD panel

Sync input

• Signal separate horizontal and vertical sync, or composite sync

which are TTL compatible

• Polarity positive and negative.

Interface frequency

The following frequency range is generalized by supported timing. If the entered

mode does not match the supported timing the display optimization will not be

assured.

• Horizontal Frequency 24KHz --80KHz(analog), 31.5– 80KHz(digital)

• Vertical Frequency 56Hz ---------75Hz

Supported Timing

TIMING FH(KHZ) SYNC TOTAL ACTIVE SYNC FRONT BACK PIXEL

FV(HZ) POLARITY (DOT/LINE) (DOT/LINE) WIDTH PORCH PORCH FOREQ.(MHZ)

(DOT/LINE) (DOT/LINE) (DOT/LINE)

640x350 31.469 + 800 640 96 16 48 25.175

VGA-350 70.087 – 449 350 2 37 60

640x400 24.83 – 848 640 64 64 80 21.05

NEC PC9801 56.42 – 440 400 8 7 25

640x400 31.469 – 800 640 96 16 48 25.175

VGA-GRAPH 70.087 + 449 400 2 12 35

640x400 31.5 – 800 640 64 16 80 25.197

NEC PC9821 70.15 – 449 400 2 13 34

640X480 31.469 - 800 640 96 16 48 25.175

VESA-PAL 50.030 - 629 480 2 62 85

640x480 31.469 – 800 640 96 16 48 25.175

VGA-480 59.94 – 525 480 2 10 33

640x480 35.00 – 864 640 64 64 96 30.24

APPLE MAC-480 66.67 – 525 480 3 3 39

640x480 37.861 – 832 640 40 16 120 31.5

VESA-480-72Hz 72.809 – 520 480 3 1 20

640x480 37.5 – 840 640 64 16 120 31.5

VESA-480-75Hz 75 – 500 480 3 1 16

720x400 31.469 – 900 720 108 18 54 28.322

VGA-400-TEXT 70.087 + 449 400 2 12 35

832x624 49.725 – 1152 832 64 32 224 57.2832

APPLE MAC-800 74.55 – 667 624 3 1 39

800x600 35.156 + 1024 800 72 24 128 36

SVGA 56.25 + 625 600 2 1 22

800x600 37.879 + 1056 800 128 40 88 40

VESA-600-60Hz 60.317 + 628 600 4 1 23

800x600 48.077 + 1040 800 120 56 64 50

VESA-600-72Hz 72.188 + 666 600 6 37 23

800x600 46.875 + 1056 800 80 16 160 49.5

VESA-600-75Hz 75 + 625 600 3 1 21

1024x768 48.363 – 1344 1024 136 24 160 65

XGA 60.004 – 806 768 6 3 29

1024x768 53.964 + 1328 1024 176 16 112 71.664

COMPAQ-XGA 66.132 + 816 768 4 8 36

1024x768 56.476 – 1328 1024 136 24 144 75

VESA-768-70Hz 70.069 – 806 768 6 3 29

1024x768 60.023 + 1312 1024 96 16 176 78.75

VESA-768-75Hz 75.029 + 800 768 3 1 28

1024x768 60.24 – 1328 1024 96 32 176 80

APPLE MAC-768 75.02 – 803 768 3 3 29

1152x864 54.054 + 1480 1152 96 40 192 80

(60Hz) 59.270 + 912 864 3 13 32

1152x864 63.851 + 1480 1152 96 32 200 94.499

(70Hz) 70.012 + 912 864 3 1 44

1152x864 67.50 + 1600 1152 128 64 256 108.00

(75Hz) 75.00 + 900 864 2 2 32

1280x960 60.00 + 1800 1280 112 96 312 108.00

(60Hz) 60.00 + 1000 960 3 1 36

1280x960 70.00 + 1800 1280 112 96 312 126.00

(70Hz) 70.00 + 1000 960 3 1 36

1280x960 75.00 + 1800 1280 112 96 312 135.00

(75Hz) 75.00 + 1000 960 3 1 36

1280x1024 64 + 1688 1280 112 48 248 108

VESA-1024-60Hz 60 + 1066 1024 3 1 38

1280x1024 80 + 1688 1280 144 16 248 135

VESA-1024-75Hz 75 + 1066 1024 3 1 38

Note: Mode 640x350, 640x400 and 720x400 will locate on middle position but cannot be expanded to full screen

on vertical direction.

2.4.4

2.4.5

85Hz refresh rate Support

Monitor should display 85Hz refresh rate mode as emergency mode.

Monitor should display “Out of Range” warning menu at this mode.

Video input Connector

Analog Video input Connector: 15pins mini D-Sub

Table 2.4.5. Pin assignment for D-sub connector

NO.

Separate Sync

1 RED VIDEO

2 GREEN VIDEO

3 BLUE VIDEO

4 GROUND

5 GROUND

6 RED GROUND

7 GREEN GROUND

8 BLUE GROUND

9 PC5V (+5V DDC)

10 CABLE DETECTION

11 GROUND

12 SDA

13 H.SYNC

14 V.SYNC

15 SCL

5 1

Color of plastic parts: Blue (PC99)

D-sub connector

For Digital DVI-D connector

Signal Signal Signal

PIN Description PIN Description PIN Description

1 RX2- 10 RX1+ 19 Shield for TMDS Channel 0

2 RX2+ 11 Shield for TMDS Channel 1 20 NC

3 Shield for TMDS Channel 2 12 NC 21 NC

4 NC 13 NC 22 Shield for TMDS Channel clock

5 NC 14 +5V 23 RXC+

6 SCL 15 Hot Plug Detect 24 RXC-

7 SDA 16 HPD C5 NC

8 NC 17 RX0- C6 NC

9 RX1- RX0+

2.5 CONTROLS

2.5.1

2.5.2

Control panel (monitor front panel)

1. Stereo Speakers (EP877)

2. Speaker Volume Control (EP877)

3. Soft Power Switch

4. DC Power-On Indicator

5. Function select Buttons

6. Adjustment Control Buttons

7. External Headphone Jack (EP877)

Note: When OSD Menu is off, press button 2 and 3 at the same time can activate “Auto

Adjustment” immediately.

OSD Functions

• OSD Format: Refer to following figure.

• OSD Border: Cyan color

• OSD Tunable Item: The 16 icons that around the border.

• Selected Item: Yellow background

• Comment: Magenta foreground, Blue background

page format :

Description:

• Brightness: Brightness adjustment, the range from 0 to 100. Default = 80

• Contrast: Contrast adjustment, the range from 0 to 100. Default = 80

• H. Position: Horizontal position adjustment.

• V. Position: Vertical position adjustment.

• Phase: Focus adjustment, the range from 0 to 100 steps.

• OSD position: OSD position adjustment.

• Auto Adjustment: Press button ( ) to activate the selected function, Auto Adjustment,

Use Analog Input or Use Digital Input.

The Auto Adjustment function let you adjust the display size, clock

and phase to obtain the best viewing settings. This process will take 3

~ 5 seconds to complete. Attention : After Auto Adjustment, the

display might display wrong position or size, if it has received a

pattern which has no screen border. You may select either Analog or

Digital Input video when VGA input or/and DVI Input is/are available.

• Clock: Frequency tracking adjustment. The max range from -50 to +50, but

some modes the range will be limited.

• Graph Text: 640x400(GRAPH) or 720x400(TEXT) mode select.

• Language: 9 kinds of language for description, including (English, German,

French, Spanish, Italian, Pyccknn˜, Japanese , simple Chinese ,

complex Chinese )

• Recall: Recall the default value.

• Color Temp: Color temperature for standard 9300,6500, 7500 or user defined.

 User:

User R: Red signal gain by user defined.

User G: Green signal gain by user defined.

User B: Blue signal gain by user defined.

 7500: Set CIE coordinate at 7500°K color temperature.

 6500: Set CIE coordinate at 6500°K color temperature.

 9300: Set CIE coordinate at 9300°K color temperature.

• Exit: Exit OSD menu function.

Sharpness : Adjust the scale-up effect(smoother or sharper.)

OSD Transparency: Adjust the transparency level of OSD. The range is from 0 to 10 scales.

Comment:

• 1280x1024: Current mode resolution.

• 60 HZ: Current mode vertical frequency±1Hz.

• VER 1.00: Firmware revision.

 Other features:

 Intellectual-Auto EP877/878 can start the Auto-Adjustment automatically when input a

new display mode at first time. After the adjustment, EP877/878 will remember this mode

and switch to optimized condition automatically for this mode whenever encounter this

mode again. Total 27 recent used modes are recorded into EEPROM

 VESA DPMS Functionality When signalled by the host CPU, EP877/878 show a black

screen about 3 seconds. If no further signal, then it shows “No Signal” and enters power

saving mode.

2.6 White Color Temperature

White color temperature is 4 preset as 9300, 7500, 6500 and User,

Default value of user color should be user which is maximum setting for panel.

Target of color setting

Color

Temp.

Color Co-ordinate Tolerance Color Co-ordinate Tolerance

x y u’ v’

9300K 0.283 0.297 +0.03 0.189 0.446 u’v’ < 0.01*

7500K 0.299 0.315 +0.03 0.194 0.459 u’v’ < 0.01*

6500K 0.313 0.329 +0.03 0.198 0.468

u’v’

0.01*

User - - - - -

*) TCO’0X A.2.6.1 requirement

User should follow “Microsoft Windows Color Quality Specification for Liquid Crystal Display OEM’s”.

(http://www.microsoft.com/hwdev/tech/color/ColorTest.asp)

2.7 POWER SUPPLY

2.7.1

2.7.2

2.7.3

input Voltage Range

The monitor shall operate within specification over the range of 90 to 264VAC power supply.

Input Frequency Range

Input power frequency range shall be from 47.5 to 63Hz over the specified input

voltage range.

Quick specification review

• Input current

1.2A (max) at 90VAC input and full load ,

0.6A (max) at 264VAC input and full load.

• Inrush current @ cold start

30A (0-peak) @ 110Vac, 50A (0-peak) @ 220Vac

(measured when switched off for at least 10 mins.)

• Output

Tolerance Output Current

Output Volt - MIN MAX

Volt Tolerance

+5Vdc

±5%

0A 1.0A

4.8~5.2Vdc

(for EP877)

+5Vdc

±5%

0.05A 1.5A 4.8~5.2Vdc

+13Vdc +25%/-10% 0A 2.2A 11.7~16.25Vdc

• Total output power: 48 Watt max. for EP877

40 Watt max. for EP878

• Withstanding voltage : 1.5KVac or 2.2KVdc for 1 minute.

• Leakage current : < 0.25mA/100Vac , <3.5mA/230Vac

• Efficiency : 70% min. @ 115V/230Vac, maximum load.

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