ViewSonic VX2262wm wmp, VS12132 Schematic

Service Manual

ViewSonic VX2262wm/wmp

Model No VS12132

22” Color TFT LCD Display

Manufacture Date: Apr-24-08

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Copyright © ViewSonic Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc. Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of Microsoft Corporation in the United States and other countries. ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered trademarks of ViewSonic Corporation. VESA is a registered trademark of the Video Electronics Standards Association. DPMS and DDC are trademarks of VESA.

ENERGY STAR (EPA). As an ENERGY STAR product meets the ENERGY STAR

Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or omissions contained herein; nor for incidental or consequential damages resulting from furnishing this material, or the performance or use of this product. In the interest of continuing product improvement, ViewSonic Corporation reserves the right to change product specifications without notice. Information in this document may change without notice. No part of this document may be copied, reproduced, or transmitted by any means, for any purpose without prior written permission from ViewSonic Corporation.

any language or manual or otherwise, without the prior written permission of ViewSonic Corporation.

is a registered trademark of the U.S. Environmental Protection Agency

partner, ViewSonic Corporation has determined that this

guidelines for energy efficiency.

Revision History

Revision Date Description of changes Approval

A01 Apr-24-08

Initial Release

（TC8MM8MKWHVSD1J）

YG.WANG

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TABLE OF CONTENTS

1. Precautions And Safety Notices 4

2. Specification 7

3. Front Panel Control And Indicators 10

4. Circuit Description 17

5. Adjustment Procedure 25

6. Troubleshooting Flow Chart 43

7. Recommended Spare Parts List 44

8. Exploded Diagram And Spare Parts List 60

9. Disassemble Process 64

10. Block Diagram 68

11. Schematic Diagram 69

12. PCB Layout Diagram 77

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1. Precautions And Safety Notices

1.1 SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS before installing and keep this guide handy.

WARNINGS

．This monitor should be operated only at the correct power sources indicated on the label

on the rear end of the monitor. If you’re unsure of the power supply in your residence, consult you local dealer or power company.

．Use only the special power adapter that comes with this monitor for power input.

．Do not try to repair the monitor your self as it contains no user-serviceable parts. This

monitor should only be repaired by a qualified technician.

．Do not remove the monitor cabinet. There is high-voltage parts inside that may cause

electric shock to human bodies, even when the power cord is unplugged.

．Stop using the monitor if the cabinet is damaged. Have it checked by a service technician. ．Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable

immediately and consult your service technician.

．Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth.

Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

．Keep the monitor away from magnetic objects, motors, TV sets, and transformer. ．Do not place heavy objects on the monitor or power cord.

1.2 PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire ,or other hazards.

1.3 SERVICE NOTES

1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

2. When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in circuit board, keep the resistor about 5mm away from circuit board.

3. Keep wires away from high voltage, high temperature components and sharp edges.

4. Keep wires in their original position so as to reduce interference.

5. Usage of this product please refer to also user’s manual.

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1.4 HANDING AND PLACING METHODS

Correct Methods: Incorrect Methods:

Only touch the metal frame of the LCD panel or the front cover of the monitor. Do not touch the surface of the polarizer.

Surface of the LCD panel is pressed by fingers and that may cause “Mura.”

Take out the monitor with cushions

Place the monitor on a clean and soft foam pad.

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Taking out the monitor by grasping the LCD panel. That may cause “Mura.”

Placing the monitor on foreign objects. That could scratch the surface of the panel or cause “Mura.”

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Place the monitor on the lap, the panel surface must be upwards.

The panel is placed facedown on the lap. That may cause “Mura.”

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2. Specification

2.1 PRODUCT SPECIFICATIONS

LCD

Type

22” (full 22” wide viewable diagonal area), TFT(Thin Film Transistor), Active Matrix WXGA+LCD,

0.282mm pixel pitch

Color Filter RGB vertical stripe

Glass Surface Anti-Glare

Input Signal Video Sync RGB analog(0.7/1.0 Vp-p, 75ohms)/TMDS Digital(100ohms)

Composite Sync, Separate Sync, Sync on Green Fh:24-83 kHz, Fv:50-76 Hz

Compatibility PC

Macintosh

Resolution Recommended

and supported

Up to 1680 x 1050 Non-interlaced Power Macintosh up to 1680 x 1050

1680 x 1050 @ 60 Hz 1440 x 900 @ 60, 75 Hz 1280 x 1024 @ 60, 75 Hz 1024 x768 @ 60, 70, 72, 75 Hz 800 x 600 @ 56, 60, 72, 75 Hz 640 x 480 @ 60, 75 Hz 720 x 400 @ 70 Hz

Power Voltage 100V~240 VAC, 50/60Hz (auto switch)

Display area Full Scan

Operating conditions

Storage conditions

Temperature Humidity Altitude

Dimensions Physical

473.76mm(H) x 296.1mm(V)

18.65”(H) x 11.66”(V) 32°F to + 104°F( 0°C to + 40°C)

10%C to + 90%(non-condensing) To 10,000 feet

-4°F to + 140°F( -20°C to + 60°C) 10%C to + 90%(non-condensing) To 40,000 feet

508.7mm(W) x 440.55mm(H) x 202.84mm(D)

20.02”(W) x 17.34”(H) x 7.98”(D)

Weight Physical 12.23 Ib(5.56 kg)

BSMI, VCCI,CCC, PSB, C-Tick, MIC, CE, Gost-R/Hygienic,

Ukraine, MPRII, ISO13406-2, SASO, TUVdotcom, UL/cUL,

Regulations

Power saving modes

On Off

FCC-B, ICES-B, TUV-S/IRAM/UL-AR S Mark, NOM, E

NERGY STAR

45W (Typical) (blue LED) <1W

Preset Timing Mode (pre-adjusted to VESA® 1680 x 1050 @ 60 Hz) Warning: Do not set the graphics card in your computer to exceed these refresh rates; doing so

may result in permanent damage to the LCD display.

Macintosh computers older than G3 require a ViewSonic® Macintosh adapter. To order an

adapter, contact ViewSonic.

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2.2 INTERFACE DESCRIPTION

D-SUB 15 PIN CONNECTOR

11 15

Pin Number Pin Function

1 Red video input

2 Green video input

3 Blue video input

4 No Connection

5 Ground

6 Red video ground

7 Green video ground

8 Blue video ground

9 +5V

10 H/V sync ground

11 No connection

12 (SDA)

13 Horizontal sync (Composite sync)

14 Vertical sync

15 (SCL)

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DVI-D 24 PIN CONNECTOR

Pin No. Signal Name Description

1 RX2- TMDS negative differential input, channel 2

2 RX2+ TMDS positive differential input, channel 2

3 GND Logic Ground

4 Reserved 4 Reserved. No connection

5 Reserved 5 Reserved. No connection

6 DDC-CLK DDC2B Clock

7 DDC-DAT DDC2B Data

8 Reserved 8 Reserved. No connection

9 RX1- TMDS negative differential input, channel 1

10 RX1+ TMDS positive differential input, channel 1

11 GND Logic Ground 12 Reserved 12 Reserved. No connection

13 Reserved 13 Reserved. No connection

14 VCCX Power

15 GND Logic Ground

16 SENS SENSE Pin, Pull High

17 RX0- TMDS negative differential input, channel 0

18 RX0+ TMDS positive differential input, channel 0

19 GND Logic Ground

20 Reserved 20 Reserved. No connection

21 Reserved 21 Reserved. No connection

22 GND Logic Ground

23 RXC+ TMDS positive differential input, reference clock

24 RXC- TMDS negative differential input, reference clock

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3. Front Panel Function Controls And Indicators

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Do the following to adjust the display setting:

1. To display the Main Menu, press button [1].

NOTE: All OSD menus and adjustment screens disappear automatically after about 15

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, press ▲or ▼ to scroll up or down in the Main Menu.

3. After the desired control is selected, press button [2]. A control screen like the one

shown below appears.

The line at the bottom of the screen shows the current functions of buttons 1 and 2: Exit or select the Brightness control.

4. To adjust the control, press the up ▲ or▼ down buttons.

5. To save the adjustments and exit the menu, press button [1] twice.

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1680 x 1050 @ 60Hz video signal to the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's user guide.)

• If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible should barely touch the illuminated “active area” of the LCD display.)

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. (The black border around the edge of the screen

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Main Menu Controls

Adjust the menu items shown below by using the up

Control

Explanation

Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video cards. If this function does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.

Contrast adjusts the difference between the image background (black level) and the foreground (white level).

Brightness adjusts background black level of the screen image.

Input Select toggles between inputs if you have more than one computer

connected to the LCD Display.

and down buttons.

Audio Adjust Volume increases the volume, decreases the volume, and mutes the audio. Mute temporarily silences audio output.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the intended. Enabling the sRGB setting will cause Contrast and Brightness adjustments to be disabled.

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9300K-Adds blue to the screen image for cooler white (used in most office

settings with fluorescent lighting).

7500K-Adds blue to the screen image for cooler white(used in most office settings with fluorescent lighting).

6500K-Adds red to the screen image for warmer white and richer red.

5000K-Adds green to the screen image for a darker color.

User Color Individual adjustments for red (R), green (G), and blue (B).

1. To select color (R, G or B) press button [2].

2. To adjust selected color, press

▲ and▼.

Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset.

Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and

the ViewSonic

website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). NOTE: VESA 1680 x 1050 @ 60Hz (recommended) means that the resolution is 1680 x 1050 and the refresh rate is 60 Hertz.

Manual Image Adjust display the Manual Image Adjust menu

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

H. Size (Horizontal Size) adjusts the width of the screen image.

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Fine Tune sharpens the focus by aligning text and/or graphics with pixel

boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

Dynamic Contrast allows the user to turn the contrast ratio enhancement on

or off.

Aspect ratio Selects the image size for 4:3, fill aspect ratio & full screen.

Response Time adjusts the response time of liquid-crystal display for image

quality enhancement.

Setup Menu displays the menu shown below:

Language Select allows the user to choose the language used in the menus and control screens.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD screen is displayed. For

example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears.

OSD Background allows the user to turn the OSD background On or Off.

Memory Recall returns the adjustments back to factory settings if the display

is operating in a factory Preset Timing Mode listed in the Specifications of this manual.

Exception: This control does not affect changes made with the User Color control, Language Select or Power Lock setting.

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SHORT CUTS FUNCTION FROM THE BUTTONS

[1]

[2]

[▼]

[▲]

[▼] + [▲]

[1] + [2]

Main Menu

Input toggle (D-sub/DVI); refer to Appendix D)

To immediately activate Audio menu.

To immediately activate Contrast menu. It should be change to Brightness OSD by push button [2]

*1 refer to the Brightness OSD *2 Under sRGB or DCR mode, this function is disabled.

1. In the CR/ BT menu, Recall both of Contrast and Brightness to default without OSD message.

2. In the Audio menu, Recall both of audio volume and mute to default without OSD message.

1. Toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode.

2. Toggle 1400x1050 and 1680x1050 mode when input 1400x1050 or 1680x1050mode.

White Balance

1. It will not shown on user’s guide

2. OSD message as below,

3. Recommend environment

[1] + [▼] + [▲]

(Keep pushing 5 sec)

3.1. Optical (Best) input timing = 640 x 480 @ 60Hz;

Following timing modes also recommended, 800 x 600 @ 60 Hz

3.2. Pattern as below,

[1] + [▲]

OSD Lock / Unlock

[1] + [▼] Power Lock / Unlock

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(Image = no blanking)

1024 X 768 @ 60 Hz

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Toggle DDC/CI and DDC/2B (DDC/CI enable/disable) and show following message for 3 seconds,

When switch to DDC/CI

[2] + [▼]

Signal + [2] + [ ] Factory Mode

Remark : All the short cuts function are only available while OSD off

When switch to DDC/2B

Default = DDC/CI

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4. Circuit Description

4.1 LCD MONITOR DESCRIPTION

The LCD MONITOR will contain a Main Board, an Power Board, Key Board which

house the flat panel control logic, brightness control logic and DDC.

Monitor Block Diagram

Power Board

(Include: adapter, inverter)

AC-IN

100V-240V

4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION

The main board contains panel control logic, brightness control logic, DDC and DC

convert DC circuit and so on.

R G B H

V SDA SCL

CCFL Drive.

Key Board

Flash memory

Flat Panel and CCFL backlight

Main Board

HOST Computer

PWPC board

TSUMO58CWHL-LF

OSC

RS232 Connector For white balance adjustment in factory mode

Video signal, DDC

Backlight and Panel

Keyboard

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4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION

PWPC board combines to adapter and inverter, Adapter which commonly consists of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and convert to 16V, 5V,5.1V DC voltage by input 90V-240V AC voltage that provide power supply for each chips in the main board and inverter. Inverter is DC TO AC circuit. It changes the 16v DC of power supply to about 600-800v AC that drives the backlight. It mostly consists of starting circuit, PWM controller, DC changing circuit, LC surging circuit, output circuit and protection circuit etc.

AC input

EMI filter

Bridge Rectifier and Filter

Transformer

Rectifier CMOS

Start Circuit R904, R905, R906

PWM

Control IC

Over Voltage Protect

Lamp

OSC and Output Circuit

DC Convert Circuit

MOSFET Q804,Q809

16V

Feedback Circuit

Over Voltage

PWM Control IC

ON/OFF Control

DIM

CN902

5.1V

ON/OF

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4.4 INTRODUCTION OF IC

TSUMO58CWHL-LF(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert

analog RGB into digital and room and shrink scaling output to LCD panel.

PIN Function:

Pin Symbol Description

41 SDO SPI flash serial data output 42 CSZ SPI flash chip select 43 SCK SPI flash serial select 44 SDI SPI flash serial data input 34 DDCA_SDA/RS232_TX DDC Data for analog interface/

UART Ttransmitter / General Purpose Input/Output; 4mA driving strength

35 DDCA_SCL/RS232_RX DDC Clock for analog interface/

UART Receiver / General Purpose Input/Output; 4mA driving strength

5 DDCD_SDA DDC Data and HDCP Slave Serial

Port Data for DVI/HDMI Interface; 4mA driving strength

6 DDCD_SCL DDC Clock and HDCP Slave

Serial Port Data for DVI/HDMI

Interface 102 BYPASS For External Bypass Capacitor 108 RST Chip reset; High reset 103 VCTRL Regulator control

32 HSYNCO Analog HSYNC input 33 VSYNCO Analog VSYNC input 31 REFP Internal ADC top de-coupling pin 30 REFM Internal ADC bottom de-coupling

7 REXT External resistor 390 ohm to

AVDD_33

37 MODE Chip Configuration Input; 10K

ohm pull-low for normal operation 128 XIN Xin; Crystal Oscillator Input 127 XOUT Xout; Crystal Oscillator Output

8,12,20

40,54,58-60,65,66,71,87,107 112,114

AVDD＿33 AVDD＿18

VDDP Digital Output Power 3.3V

ADC Analog Power 3.3V

ADC Analog Power 1.8V

53,74,104,126 VDDC Digital Core Power 1.8V 1,11,17,29,52,62,63,68,69,72,

GND Ground

88,101,105,106,113

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AP1117D33LA(701): DC power convert, convert to 3.3v.

SST25LF020A-33-4C-SAE(U402): SST’s serial flash family features a four-wire,

SPI-com-patible interface that allows for a low pin-count package occupying less board space and ultimately lowering total system costs. The SST25LF020A/040A devices significantly improve performance, while lowering power consumption. The total energy consumed is a function of the applied voltage, current, and time of application. The SST25LF020A/040A devices operate with a single 3.0-3.6V power supply. The SST25LF020A devices are offered in an 8-lead SOIC 150 mil body width (SA) package.

Pin Diagram:

PIN Descriptions:

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Symbol Pin Name Functions

To provide the timing of the serial interface.

SCK Serial Clock

Commands, addresses, or input data are latched on the rising edge of the clock input, while output data is shifted out on the falling edge of the clock input.

Serial Data

Input

Serial Data Output

To transfer commands, addresses, or data serially into the device. Inputs are latched on the rising edge of the serial clock.

To transfer data serially out of the device. Data is shifted out on the falling edge of the serial clock.

The device is enabled by a high to low transition on CE#.

CE# Chip Enable

CE# must remain low for the duration of any command sequence.

WP# Write Protect

HOLD# Hold

The Write Protect (WP#) pin is used to enable/disable BPL bit in the status register.

To temporarily stop serial communication with SPI flash memory without resetting the device.

VDD Power Supply To provide power supply(3.0-3.6V)

VSS Ground

Circuit Diagram

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LD7552DPS (IC901): PWM control, high-voltage startup current. The circuit unit has

functions such as over-current protection, over-voltage protection, output short-circuit protection and etc. The function of each pin and the inside circuit diagram are as follows:

Pin Name Function

1 GND Ground

Voltage feedback pin (same as the COMP pin in UC384X), By

2 COMP

connecting a photo-coupler to close the control loop and achieve the regulation

3 VCC Supply voltage pin

4 RT

This pin is to program the switching frequency. By connecting a resistor

to ground to set the switching frequency. 6 NC Unconnected pin 7 VCC Supply voltage pin 8 OUT Gate drive output to drive the external MOSFET

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TL494IDR(IC801): The TL494 incorporates all the functions required in the construction

of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.

PIN Descriptions:

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5. Adjustment Procedure

5.1 ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory.

3. ESD protection is needed before adjustment.

5.2 MAIN ADJUSTMENTS

NO. FUNCTIONS DESIGNATION

1. White Balance Function Key

2. Geometry Function Key

5.3 ALIGNMENT PROCEDURES

Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment.

1. Adjust of White Balance

1.) How to do the CA-210 MEM .Channel setting

A、Reference to CA-210 user guide B、Use “ MODE” key to modify x、y、Lv value and use “MEMORY CH” key to modify the TEXT description Following is the procedure to do white-balance adjust

2.) Setting the color temp. You want

A、MEM.CHANNEL1 ( 9300 color): 9300 color temp. parameter is x = 0.283 ±0.003; y = 0.298 ±0.003;

Lv ≥ 175 cd/m

B、MEM.CHANNEL 1 ( 7500 color):

2 ,

7500 color temp. parameter is x = 0.299±0.003; y = 0.315 ±0.003; Lv ≥ 188cd/m

C、MEM.CHANNEL1 ( 6500 color):

6500 color temp. parameter is x = 0.313±0.003; y = 0.329 ±0.003; Lv ≥ 213cd/m

D、MEM.CHANNEL 1 ( 5000 color):

5400 color temp. parameter is x = 0.346±0.003; y = 0.359 ±0.003; Lv ≥ 175cd/m

E、MEM.CHANNEL1 ( SRGB color):

SRGB color temp. parameter is x=0.313±0.003; y=0.329±0.003; Lv≥85cd/m2,

3.) Into factory mode of VX2262wm/wmp:

First Power off, then press Switch 1 button along with press Power button will activate

the factory mode, then MCU will do AUTO LEVEL automatically. Meanwhile press MENU the OSD screen will located at LEFT TOP OF PANEL.

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