Viewsonic VA712B-2, VA712-2 SERVICE MANUAL A01

Service Manual

ViewSonic VA712b-2

Model No VS10901

17” Color TFT LCD Display

Manufacture Date: Mar-30-06

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publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic

makes no representation or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability of 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.

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

Revision History

Revision Date Description of changes Approval

A00 Sep-9-05 Initial Release YG.WANG

Update the Handing and Placing Methods

A01 Mar-30-06

and the Circuit Description and the

Adjustment Procedure

YG.WANG

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TABLE OF CONTENTS

1. Precautions And Safety Notices 4

2. Specification 7

3. Front Panel Control And Indicators 11

4. Circuit Description 17

5. Adjusting Procedure 27

6. Troubleshooting Flow Chart 47

7. Recommended Spare Parts List 48

8. Exploded Diagram And Spare Parts List 66

9. Disassemble Process 70

10. Block Diagram 75

11. Schematic Diagram 76

12. PCB Layout Diagram 83

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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

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

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Place the monitor on a clean and soft foam pad.

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

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 Panel 17.0” TFT

Recommend Resolution 1280 x1024@60Hz

Pixel Dimension 0.264(H) x 0.264(V)mm

LCD Display Color 16.2M Colors (RGB 6-bit+FRC data)

Horizontal: 140

Viewing Angle

Vertical: 130 °

Contrast Ratio 500：1 (Typ.)

Brightness 300 cd/㎡(Typ.)

Response Time 8ms(Typ.)

Active Display Area 337.9mm(H) x 270.3mm(V)

Maximum Pixel Clock 135 MHz

Horizontal Frequency 30 – 82 kHz

Vertical Refresh Rate 50 – 85 Hz.

Operating: 0°C to +40°C

Temperature

Input Signal

Storage: -20°C to +60°C

Analog / Digital

Energy Star compliant VESA

Power Management

DPMS compatible

≦1 W

Input Voltage : 90V~264ACV，50~60Hz(auto switch)

Power

Consumption: 39 Watts(Max.) 36 Watts(Typ.)

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2.2 FACTORY SUPPORTING MODES

Timing Table :

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes

2 640 x 480 @ 60Hz, 31.5kHz Yes Yes

3 640 x 480 @ 67Hz, 35.0kHz Yes Yes

4 640 x 480 @ 72Hz, 37.9kHz Yes Yes

5 640 x 480 @ 75Hz, 37.5kHz Yes Yes

6 640 x 480 @ 85Hz, 43.27kHz Yes Yes

7 720 x 400 @ 70Hz, 31.5kHz Yes Yes

8 800 x 600 @ 56Hz, 35.1kHz Yes Yes

9 800 x 600 @ 60Hz, 37.9kHz Yes Yes

10 800 x 600 @ 72Hz, 48.1kHz Yes Yes

11 800 x 600 @ 75Hz, 46.9kHz Yes Yes

12 800 x 600 @ 85Hz, 53.7kHz Yes Yes

13 832 x 624 @ 75Hz, 49.7kHz Yes Yes

14 1024 x 768 @ 60Hz, 48.4kHz Yes Yes

15 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

16 1024 x 768 @ 72Hz, 58.1kHz Yes Yes

17 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

18 1024 x 768 @ 85Hz, 68.67kHz Yes Yes

19 1152 x 870 @ 75Hz, 68.6kHz Yes Yes

20 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes

21 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes

22 1280 x 720 @ 60Hz, 45kHz Yes Yes

Primary Preset:：VESA : 1280 x1024@60Hz

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2.3 INTERFACE DESCRIPTION

D-SUB 15 PIN CONNECTOR

11 15

SIGNAL LEVEL

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 co n nection

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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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 command line at the bottom of the control screen tells what to do next from this screen. You can toggle between control screens, adjust the selected option, or exit the screen.

4. To adjust the setting, press the up ▼ or ▲ down T 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 1280 x 1024 @ 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 sizes and centers the screen image automatically. 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 allows the user to toggle between an analog and a digital signal.

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

and down buttons.

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).

9300K-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. 5400K-Adds green to the screen image for a darker color. 5000K-Adds blue and 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.

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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 1280 x 1024 @ 60Hz (recommended) means that the resolution

is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust Sub-menu

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

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

right and up or down.

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.

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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 allows the user to enable or disable this notice.

If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1280 x 1024, the following screen appears.

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 “30 second” setting, if a control is not pushed within 30

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.

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SHORT CUTS FUNCTION FROM THE BUTTONS

[1]

[2]

[▼] or [▲]

[▼] + [▲]

[1] + [2]

[1] + [▼] + [▲]

[1] + [▼]

Main Menu

Auto Image Adjust

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

Recall Contrast or Brightness while in the Contrast or Brightness adjustment, or recall both of Contrast and Brightness when the OSD is not open.

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

White Balance (Not shown on user’s guide)

• Power Lock: Press and hold “[2], & ▼” for 10 seconds.

If the power button is pressed the message Power Button Locked will display for 5 seconds. With or without

this setting, after a power failure, your LCD display’s power will automatically turn ON when power is restored.

• Power Unl ock: Press and hold “[2], & ▼” again for 10

seconds.

• OSD Lock: Press and hold "[1], & (▲)" for 10 seconds.

If any buttons are pressed the message OSD Locked will

[1] + [▲]

display for 5 seconds.

• OSD Unlock: Press and hold “[1], & ▲” again for 10

seconds.

[;U]

Volume mute on/off

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

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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.

The Power Board will provide AC to DC Inverter voltage to drive the backlight of panel and

the Main Board chips each voltage.

Flat Panel and CCFL backlight

Main Board

HOST Computer

RS232 Connector For white balance adjustment in factory mode

Video signal, DDC

Power Board

(Include: adapter, inverter)

AC-IN

100V-240V

Monitor Block Diagram

CCFL Drive.

Key Board

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4.2 POWER BLOCK FUNCTION DESCRIPTION

Inverter Block Function

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Power Block Function

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4.4 INTRODUCTION OF IC

RTD2523B-LF(U401): integrate ADC, OSD, TMPS, RSDS TX, LVDS TX, convert

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

PIN Function:

Pin Symbol Description

127 XO Crystal OSC output 128 XI Reference clock input from external crystal or from

single-ended CMOS/TTL OSC（3.3V tolerance）

51 121 120 123 RESET_OUT Reset out Open drain( internal 75KOhm high)

110/48 COUT Crystal out

124 33VRST_REF Reference 3.3V for Reset Out 109 33VPNLOUT

58 BJT_B Embedded regulator P type BJT control pin out

5 TMDS_TST TMDS_TEST Pin;

7/13 TMDS_VDD

6 REXT Impedance Match Reference.

49/112 PWM2

4/48/111 PWM1

3/5/122 PWM0

4 BYPASS For External Bypass Capacitor

125 DPLL_VDD

2 APLL_VDD 3 PLL_TEST1 Test Pin 1;Power-on-latch for MCU crystal location

4 PLL_TEST2 Test Pin 2;Power-on-latch for crystal in frequency

56/118 SCSB 57/119 SCLK

59/83/108 Pad 3.3V Power PVCC

47/116 Digital 1.8V Power VCCK

21/38 ADC_VDD

40 VCLK Video8 Clock

19 AVSO ADC vertical sync input

20 AHSO ADC horizontal sync input

AIC1084-33PM (U701): DC power convert, used to 5v convert 3.3v.

DDCSCL1（ADC） Open drain（Internal 75K pull high）

DDCSDA1（ADC） Open drain（Internal 75K pull high）

DDCSCL2（DVI） Open drain（Internal 75K pull high）

DDCSDA2（DVI） Open drain（Internal 75K pull high）

Panel on/off switch out （Max current driving 1A）

Power-on-latch for host interface type. TMDS power（3.3V）

Power for digital PLL（3.3V） Power for multi-phase PLL（3.3V）

Serial control I/F chip select（Open drain） Serial control I/F clock（Open drain）

ADC Power（1.8V）

5V tolerance Power from PIN 13

Adjustable Schmidt trigger 5V tolerance Power from PIN 13

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MTV512GMV64 (U402): The MTV512M micro-controller is an 8051 CPU core

embedded device especially tailored for flat panel display applications. It includes an 8051 CPU core, 768-byte SRAM, 4 channels of 6-bit ADC, 3 external counters/timers, 6 channels of PWM DAC, VESA DDC interface, and a 64K-byte internal program Flash-ROM memory.

Circuit Diagram

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PIN Function

Name

NC 1 39 DA0/P5.0 2 40 DA1/P5.1 3 41 DA2/P5.2 4 42 DA3/P5.3 5 43 DA4/P5.4 6 44 DA5/P5.5 7 1 P5.6/HSCL2 8 2 P5.7/HSDA2 9 3 RST 10 4 HSCL1/P3.0/RXD 11 5 HSDA1/P3.1/RXD 13 7 P3.2/INT0 14 8

Pin No.

PLCC QFP

No connection PWM DAC output/General purpose I/O (open drain) PWM DAC output/General purpose I/O (open drain) PWM DAC output/General purpose I/O (open drain) PWM DAC output/General purpose I/O (open drain) PWM DAC output/General purpose I/O (open drain) PWM DAC output/General purpose I/O (open drain) General purpose I/O/Slave llC1 SCL2（open drain） General purpose Output/Slave llC1 SCL2（open drain） High Active RESET Slave IIC clock/General purpose I/O/Rxd (open drain) Slave IIC clock/General purpose I/O/Txd (open drain) General purpose I/O/External interrupt 0(Standard 8051)

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DESCRIPTION

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P3.3/INT1 15 9 P3.4/T0 16 10 P3.5/T1 17 11 P7.6/CLKO2 18 12 P7.7 19 13 X2 20 14 X1 21 15 VSS 22 16 P6.0/AD0 24 18 P6.1/AD1 25 19 P6.2/AD2 26 20 P6.3/AD3 27 21 P6.4 28 22 P6.5 29 23 P6.6/CLKO1 30 24 P6.7 31 25 VSYNC 32 26 P1.7 36 30 P1.6 37 31 P1.5 38 32 P1.4 39 33 P1.3 40 34 P1.2 41 35 P1.1 42 36

P1.0/ET2

VCC 44 38

General purpose I/O/External interrupt 1(Standard 8051) General purpose I/O/T0 Ext. Counter/Timer 0(Standard8051) General purpose I/O/T1 Ext. Counter/Timer 1(Standard8051) General purpose I/O/Clock out 2 (CMOS) General purpose I/O (CMOS) Crystal Out Crystal In Ground General purpose I/O(COMS)/6-bit ADC channel 0 input General purpose I/O(COMS)/6-bit ADC channel 1 input General purpose I/O(COMS)/6-bit ADC channel 2 input General purpose I/O(COMS)/6-bit ADC channel 3 input General purpose I/O(COMS) General purpose I/O(COMS) General purpose I/OCLKO1(COMS) General purpose I/O(COMS) VSYNC input General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O(Standard 8051/CMOS) General purpose I/O/External Counter/Timer2(Standard

8051/CMOS)

3.3V power

TDA7496L (U201): The UTC TDA7496L is a stereo 2W+2W class AB power amplifier,

specially designed for high quality sound, TV and Monitor applications. Features of the UTC TDA7496L include linear volume control, Stand-by and

mute functions.

Pin Function

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Circuit Diagram

LD7552BS (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

3 VCC Supply voltage pin

4 RT

6 NC Unconnected pin 7 VCC Supply voltage pin 8 OUT Gate drive output to drive the external MOSFET

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

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

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FAN7547A(IC201): The FAN7547A provides all control functions for a current fed

push-pull self oscillation type converter, and also contains voltage. Typical operating frequency range is between 30kHz depending on the CCFL(Cold

Cathode Fluorescent Lamp) and the transformer’s characteristics:

NO. Name Function Description NO. Name Function Description

1 GNDT Ground 8 FB Feedback Input

2 Vds Dimming Voltage Input 9 COMP Error Amplifier Output

3 Vref Reference Voltage 10 S/S Soft Start

4 Vms Dimming Mode Selection 11 OSC Main Ct

5 Rct

6 OLP Open Lamp Protection 13 Vcc1 Output Drive Source Voltage

7 SDP Shutdown Protection 14 OUT Output Drive

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Burst Dimming Frequency Set

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12 Vcc Supply Voltage

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5. Adjust 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 Chroma-7120 MEM .Channel setting

A、Reference to Chroma 7120 user guide

B、Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the

TEXT description Following is the procedure to do white-balance adjust

2.)Setting the color temp. You want

A、MEM.CHANNEL9 ( 9300 color): 9300 color temp. parameter is Wx = 0.283 ±0.02;Wy = 0.298 ±0.02;

Y > 190 cd/m

B、MEM.CHANNEL10 ( 6500 color):

6500 color temp. parameter is Wx = 0.313±0.02;Wy = 0.329 ±0.02; Y > 260 cd/m

C、MEM.CHANNEL 11 ( 5400 color):

5400 color temp. parameter is Wx = 0.335±0.02;Wy = 0.350 ±0.02; Y > 210 cd/m

D、MEM.CHANNEL 12 ( 5000 color):

5000 color temp. parameter is Wx = 0.346±0.02;Wy = 0.359 ±0.02; Y > 210 cd/m

E、MEM.CHANNEL13 ( SRGB color):

SRGB color temp. parameter is Wx = 0.313±0.02;Wy = 0.329 ±0.02; Y > 220 cd/m

2 ,

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3.)Into factory mode of VA712b-2

A、First Power off, then press Switch 2 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.

4.)Bias adjustment :

Set the Contrast Adjust the Brig htness

to 70

to 100.

5.)Gain adjustment : Move cursor to “-F-” and press MENU key

A、Adjust 9300 color-temperature

(1)、Switch the Chroma-7120 to RGB-Mode (with press “MODE” button )

(2)、Switch the MEM. channel to Channel 9 ( with up or down arrow on Chroma 7120 ) (3)、The LCD-indicator on Chroma 7120 will show x = 0.283 ±0.02, y =0.298 ±0.02,

Y > 250 cd/m

(4)、Adjust the RED of color1 on factory window until chroma 7120 indicator reached

the value R=100

(5)、Adjust the GREEN of color1 on factory window until Chroma 7120 indicator reached

the value G=100

(6)、Adjust the BLUE of color1 on factory window until Chroma 7120 indicator reached

the value B=100

(7)、Repeat above procedure ( item 4,5,6) until Chroma 7120 RGB value meet the

tolerance =100±5

B、Adjust 6500 color-temperature

(1)、Switch the chroma-7120 to RGB-Mode (with press “MODE” button )

(2)、Switch the MEM .channel to Channel 10( with up or down arrow on Chroma 7120 ) (3)、The LCD-indicator on Chroma 7120 will show x = 0.313 ±0.02, y = 0.329 ±0.02,

Y>260 cd/m

(4)、Adjust the RED of color3 on factory window until Chroma 7120 indicator reached

the value R=100

(5)、Adjust the GREEN of color3 on factory window until Chroma 7120 indicator reached

the value G=100

(6)、Adjust the BLUE of color3 on factory window until Chroma 7120 indicator reached

the value B=100

(7)、Repeat above procedure ( item 4,5,6) until Chroma 7120 RGB value meet the

tolerance =100±5

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