Acer SPECTRUM Series User manual

SERVICE MANUAL
SPECTRUM Series
LCD Monitor
F1725
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION
AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS,
MANUFACTURE DATE : 2004-2-11

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TABLE OF CONTENTS
1. SPECIFICATIONS .................................................................................….…...……….. 3
1-1 GENERALSPECIFICATIONS .…................................................………………... 3
1-2 LCD MONITOR DESCRIPTION ....................................................………….…... 4
1-3 INTERFACE CONNECTOR ......................................................…………………. 4
2. PRECAUTION AND NOTICES ................................................................……………..... 5
2-1 ASSEMBLY PRECAUTION ............................................................…………….... 5
2-2 OPERATIONG PRECAUTION .....................................................……………...... 5
2-3 STORAGE PRECAUTION …...................................................……………........... 5
2-4 HIGH VOLTAGE WARNING .......................................................……………....... 5
3. OPERATING INSTRUCTIONS ..................................................................……………... 6
4. ADJUSTMENT .....................................................................................……………......... 7
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ..............………………....... 7
4-2 FRONT PANEL CONTROL KNOBS .........................................………………...... 9
5. CIRCUIT & SOFTWARE DESCRIPTION .............……………………………………..….. 10
5-1 THE DIFFERENT BETWEEN EACH PANEL …………………………………..….. 10
5-2 SIMPLE-INTRODUCTION………………………..…………………………………... 11
5-3 SOFTWARE FLOW-CHART……………………………………………………..….... 13
6. A). INTERFACE-BOARD TROUBLE SHOOTING CHART ..................……………..…... 15
B). INVERTER - MODULE TROUBLE SHOOTING CHART ..................……………...… 22
C). ADAPTER TROUBLE SHOOTING CHART………......………………………………... 34
D). Main-chip GMZAN2 SPECFICATION…………………………………………………….. 35
7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY....................……………............ 61
8. PARTS LISTING .....................................................................................……………...… 62-76
9. POWER SYSTEM AND CONSUMPTION CURRENT...............................…………….... 76
10. PCB LAYOUT .....................................................................…………………………..….. 77
11. SCHEMATIC ………………………………...…...........................................……………..… 78-82

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1. SPECIFICATIONS FOR LCD MONITOR
1-1 General specifications
1. LCD-PANEL :
Active display area 17 inches diagonal
Pixel pitch 0.264 mm x 0.264 mm
Pixel format 1280 x 1024 RGB vertical stripe arrangement
2. Display Color : 8-bit, 16.7 million colors
3. External Controls :Power On/Off, Auto key, Left key, Right key ( for 4-key )
OSD menu Controls: Contrast, Brightness, Focus, Clock, H-position, V-position, Language,
Recall-7800, Recall-6500, Reset,
Exit-OSD, Red, Green, Blue, Selected Dos-resolution
4. Input Video Signal :
Analog-signal 0.7Vpp
Video signal termination impedance 75 OHM
5. Scanning Frequencies :
Horizontal: 29 KHz - 80 KHz
Vertical: 55 Hz – 75 Hz
Pixel clock: 135 MHz
6. Factory Preset Timing : 18
User Timings : 19
Input signal tolerance : H tolerance ±1 K, V tolerance ±1 Hz
7. Power Source :
Switching Mode Power Supply
AC 100 – 240 V, 50/60 Hz Universal Type
8. Operating Temperature : 0℃- 50℃Ambient
Non-operating Temperature : -20℃- 60℃
9. Humidity :
Operating : 20% to 80% RH (non-condensing)
Non Operating : 5% to 95%RH (38.7℃maximum wet bulb temperature)
10. Weight : 5.5 kg
11. External Connection : 15Pin D-type Connector, AC power-Cord
12. View Angle : x-axis right/left = 60, y-axis up/down = 40 ,60
13. Outside dimension : Width x Height x Thickness = 422x 449 x 215 mm
14. Plug and Play : VESA DDC1/DDC2B
15. Power saving : VESA DPMS

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1-2 LCD MONITOR DESCRIPTION
The LCD MONITOR will contain an main board, an Inverter module, keyboard and External
Adapter which house the flat panel control logic, brightness control logic, DDC and DC-DC
conversion
The Inverter module will drive the backlight of panel .
The Adapter will provides the 12V DC-power 5 Amp to Main-board and Inverter module .
1-3 Interface Connectors
(A) AC-Power Cable
(B) Video Signal Connectors and Cable
(C)External Adapter
Inverter
Flat Panel and
CCFL backlight
Main Board
Keyboard
RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFL Drive.
AC-IN
100V-240V
Video signal, DDC
Monitor Block Diagram
Adapter

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2. PRECAUTIONS AND NOTICES
2-1 ASSEMBLY PRECAUTION
(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD
panel surface by touching with bare hands (Polarizer film, surface of LCD panel is easy to
be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to maintain
display characteristic and reliability. If this panel is subject to hard pressing, the following
occurs :
(a) Uniform color (b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being
soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
2-2 OPERATING PRECAUTIONS
(1) Please be sure to unplug the power cord before remove the back-cover. (be sure the power
is turn-off)
(2) Please do not change variable resistance settings in MAIN-BOARD, they are adjusted to
the most suitable value. If they are changed, it might happen LUMINANCE does not satisfy
the white balance spec.
(3) Please consider that LCD backlight takes longer time to become stable of radiation
characteristic in low temperature than in room temperature.
(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on
LCD.
2-3 STORAGE PRECAUTIONS
(1) When you store LCD for a long time, it is recommended to keep the temperature between 0
℃-40℃without the exposure of sunlight and to keep the humidity less than 90% RH.
(2) Please do not leave the LCD in the environment of high humidity and high temperature
such as 60℃90%RH.
(3) Please do not leave the LCD in the environment of low temperature; below -15℃.
2-4 HIGH VOLTAGE WARNING
The high voltage was only generated by INVERTER module, if carelessly contacted the
transformer on this module, can cause a serious shock. (the lamp voltage after stable around
600V, with lamp current around 8mA, and the lamp starting voltage was around 1500V, at
Ta=25℃)

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3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the LM700 LCD monitor display.
1. Position the display on the desired operation and plug–in the power cord into External
Adapter AC outlet. Three-wire power cord must be shielded and is provided as a safety
precaution as it connects the chassis and cabinet to the electrical conduct ground. If the AC
outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and
lock both screws on the connector to ensure firm grounding. The connector information is
as follow:
15 - Pin Color Display Signal Cable
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1. RED 9. 5V power from VGA-card
2. GREEN 10. GND
3. BLUE 11. SYNC. GND
4. GND 12. SDA
5. GND 13. HORIZ. SYNC
6. GND-R 14. VERT. SYNC
7. GND-G 15. SCL
8. GND-B
3. Apply power to the display by turning the power switch to the "ON" position and allow about
thirty seconds for Panel warm-up. The Power-On indicator lights when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen,
adjust the brightness and contrast to the most pleasing display, or press auto-key to get the
best picture-quality.
5. This monitor has power saving function following the VESA DPMS. Be sure to connect the
signal cable to the PC.
6. If your F1725 LCD monitor requires service, it must be returned with the power cord &
Adapter.
1
6
11 15
5
10

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4. ADJUSTMENT
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
Adjustments should be undertaken only on following function : contrast, brightness focus, clock,
h-position, v-position, red, green, blue since 6500 color & 7800 color.
4-2 ADJUSTMENT METHOD
Press MENU button to activate OSD Menu or make a confirmation on desired function, Press
Left/Right button to select the function or done the adjustment.
1. White-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance
adjustment.
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.CHANNEL 3 C2 ( 7800 color):
7800 color temp. parameter is x = 296 ±10, y = 311 ±10, Y = 200 ±10 cd/m2 ,
B、MEM.CHANNEL 4 C1 ( 6500 color):
6500 color temp. parameter is x = 313±10, y = 329 ±10, Y =200 ±10 cd/m2)
3、Into factory mode of F1725
A、Press MENU button during 2 seconds 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 to 70
Adjust the Brightness to 90.
5、Gain adjustment :
Move cursor to “-F-” and press MENU key
A、Adjust C2(7800) color-temperature
1、Switch the Chroma-7120 to RGB-Mode (with press “MODE” button )
2、Switch the MEM. channel to Channel 3 ( with up or down arrow on chroma 7120 )
3、The LCD-indicator on chroma 7120 will show x = 296 ±10, y = 311 ±10,
Y = 200 ±10 cd/m2
4、Adjust the RED of color1 on factory window until chroma 7120 indicator reached
the value R=100

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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±2
B、Adjust C1(6500) color-temperature
1、Switch the chroma-7120 to RGB-Mode (with press “MODE” button )
2、Switch the MEM .channel to Channel 4( with up or down arrow on chroma 7120 )
3、The LCD-indicator on chroma 7120 will show x = 313 ±10, y = 329 ±10,
Y = 200 ±10 cd/m2
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±2
C、Press reset key and Turn the Power-button “off to on” to quit from factory mode.
2. Clock adjustment
Set the Chroma at pattern 63 (cross-talk pattern) or WIN98/95 shut-down mode (dot-
pattern).
Adjust until the vertical-Stripe-shadow as wide as possible or no visible.
This function is adjust the PLL divider of ADC to generate an accurate pixel clock
Example : Hsyn = 31.5KHz Pixel freq. = 25.175MHz (from VESA spec)
The Divider number is (N) = (Pixel freq. x 1000)/Hsyn
From this formula, we get the Divider number, if we fill this number in ADC register (divider
register), the PLL of ADC will generate a clock which have same period with above Pixel
freq.(25.175MHz) the accuracy of this clock will effect the size of screen.(this clock was
called PIXEL-CLOCK)
3. Focus adjustment
Set the Chroma at pattern 63 (cross talk pattern) or WIN98/95 shut down mode (dot-
pattern).
Adjust the horizontal interference as less as possible
This function is adjust the phase shift of PIXEL-CLOCK to acquire the right pixel data .
If the relationship of pixel data and pixel clock not so match, we will see the horizontal
interference on screen ,we only find this phenomena in crosstalk pattern or dot pattern ,
other pattern the affect is very light
4. H/V-Position adjustment
Set the Chroma to pattern 1 (crosshatch pattern) or WIN98/95 full-white pattern confirm
above item 2 & 3 functions (clock & focus) was done well, if that 2 functions failed, the H/V
position will be failed too. Adjust the four edge until all four-edges are visible at the edge of
screen.
5. MULTI-LANGUAGE function
There have 5 language for selection, press “MENU” to selected and confirm , press “ LEFT”
or “ RIGHT” to change the kind of language ( English , Deutch , Francais, Espanol, Italian)
6. Reset function
Clear each old status of auto-configuration and re-do auto-configuration ( for all mode)
This function also recall 7800 color-temperature , if the monitor status was in “ Factory-
mode” this reset function will clear Power-on counter ( backlight counter) too.

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7. OSD-LOCK function
Press Left & Right key during switching on the monitor, the access to the OSD is locked,
user only has access to “ Contrast, Brightness, Auto-key “.
If the operator pressed the Left & Right during switching on the monitor again , the OSD is
unlocked.
8. View Power-on counter and reset the Power-on counter( if not necessary , no suggest to
entry factory mode)
The Power-on counter was used to record how long the backlight of panel already working,
the backlight life time was guarantee minimal 25000 hours, the maintainer can check the
record only in factory mode.
Press MENU button for 2 seconds along with plug-in DC power cord will be in factory mode,
and the OSD screen will located at left top of panel but take cautions don’t press icon “78”
& “65”, if you press 78/65 , your white-balance data will overlap with the new-one, and you
must perform the white-balance process again.
The result of counter was place at top of OSD, the maximal of record memory was 65000
hours, if exceed 65000 hours the counter will keep in 65000 hours until press “ RESET” at
osd-menu in factory mode.
The “ RESET” function in factory mode will execute following function:
1. clear the Power-on counter to zero hours
2. clear old auto-configuration status for all mode , so the monitor will automatically re-do
auto-config when change to next mode or power on-off
4-2 FRONT PANEL CONTROL KNOBS
Power button : Press to switch on or switch off the monitor.
Auto button : to perform the automatic adjustment from CLOCK, FOCUS, H/V POSITION, but no
affect the color-temperature
Left/Right button : select function or do an adjustment.
MENU button : to activate the OSD window or to confirm the desired function
5.CIRCUIT-DESCRIPTION
5-1 SPECIAL FUNCTION with PRESS-KEY
A). press Menu button during 2 seconds along with plug-in the DC Power cord:
That operation will set the monitor into “Factory- mode”, in Factory mode we can do the
White balance adjustment with RS232 , and view the Backlight counter (this counter is use to
record the panel activate hours ,for convenient the maintainer to check the panel backlight
life time)
In Factory mode, OSD-screen will locate in left top of screen.
Press POWER-button off to on once will quit from factory mode and back to
user-mode.
B). Press both Left & Right button along with Power button off to on once will activate the
OSD-LOCK function, repeat this procedure will disable OSD-LOCK
In OSD-LOCK function, all OSD function will be lock , except Contrast and Brightness
OSD-INDEX EXPLANATION
1. CABLE NOT CONNECTED: Signal-cable not connected.
2. INPUT NOT SUPPORT:
a. INPUT frequency out of range: H > 81kHz, v > 75Hz or H < 28kHz, v < 55Hz
b. INPUT frequency out of VESA-spec. (out of tolerance too far)
3. UNSUPPORT mode, try different Video-card Setting:
Input frequency out of tolerance, but still can catch-up by our system (if this message show,
that means, this is new-user mode, AUTO-CONFIG will disable)

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5-2 SIMPLE-INTRODUCTION
1. GMZAN2 ( all-in-one chip solution for ADC, OSD, scalar and interpolation) :
USE for computer graphics images to convert analog RGB data to digital data with
interpolation process, zooming, generated the OSD font , perform overlay function and
generate drive-timing for LCD-PANEL.
2. M6759 (ALI- MCU, type 8052 series with 64k Rom-size and 512 byte ram) :
Use for calculate frequency, pixel-dot , detect change mode, rs232-communication, power-
consumption control, OSD-index warning , …etc.
3. 24LC21 (MicroChip IC) :
EEPROM type, 1K ROM-SIZE, for saving DDC-CONTENT.
4. 24C04 (ATMEL IC) :
EEPROM type, 4K ROM-SIZE, for saving AUTO-config data, White-balance data, and
Power-key status and Backlight-counter data.
5. LM2569S( NS brand switching regulator 12V to 5V with 3A load current) .
6. AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. LVDS ( use NOVATEK NT7181F)
Convert the TTL signal to LVDS signal
The advantage of LVDS signal is : the wire can be lengthen and eliminate wire number , low
EMI .
LVDS signal is high frequency but low voltage, only 0.35 VPP ,the frequency is seven times
higher than TTL
MODULE-TPYE COMPONENT :
1. ADAPTER : CONVERSION-module to convert AC 110V-240V to 12VDC, with 5.0 AMP
2. INVERTER : CONVERSION-module to convert DC 12V to High-Voltage around 1600V, with
frequency 30K-80Khz, 7mA-9Ma

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GMZAN1 (U200)
LVDS chip (U601,
U602)
Panel-Power Control
(U202)
MCU ( U302 )
Data Digital RGB
Panel Control Signal:
Dhs, Dvs, Dclk
Panel Power 5V
Communication signal:
Hclk,Hfs,Hdata0
Input analog RGB &
H,V,& ddc signal &
Rs232 communication
Oscillator 50 mhz
Cr
y
stal 20 mhz
DDC-chi
p
PANEL
Main-board Block diagram
INVERTER module
Keyboard module
EXTERNAL-
ADAPTER
DC 12V 5Amp

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5-3 SOFTWARE FLOW CHART
I. Power-On Subrotine CHART

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II. MAIN SUBROTINE LOOP
)
Main loop start
Process Power-saving status ( according to below flow-chart result)
Check GMZAN IFM status .is change or not.
And check Signal cable status ( cable not connected or not )
** IFM is the register which measured the HSYN & Vsyn status
Is current system status in Power-saving ?
Yes, IFM have change Wake-up GMZAN1
(because GMZAN1 was in
partial sleeping state)
Yes
Check the IFM result is in the standard
Mode table ?
No
Check the IFM result is in the user mode
table ?
Out of range ( input not support) be
confirm
Set mode index & parameter
Set change mode flag
No
No
Yes
Yes
confirm the frequency ( Hsyn or Vsyn) from IFM already
been changed ? ( check the change mode flag)
Process ( turn off OSD , setting GMZAN1according to
above parameter,set LED status, set backlight status)
Check Auto-config mode flag already been set?
No
Do Auto-config
automatically
Read Key status and Process on OSD-screen
Check Factory mode flag= 1
No
Yes , freq had been change
Monitoring the time-out of osd status ( if no key input persist for
10 sec , the osd time-out counter will trigger )
No
if the RS232 buffer is full,
process the command( while
adjust white-balance in factory
mode)
Yes
No
Yes

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6. A). Interface-Board Trouble-Shooting chart
*Use the PC Win 98 white pattern, with some icon on it, and Change the Resolution to 640x480 60 Hz / 31
KHz
**NOTICE : The free-running freq. of our system is 48 KHz / 60 Hz, so we recommend to use another
resolution to do trouble shooting, this trouble shooting is proceed with 640x480 @60Hz 31Khz
I. NO SCREEN APPEAR
DC-Power Part

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II (a) THE SCREEN is Abnormal , stuck at white screen, OSD window can’t
appear, but keyboard & LED was normal operation.
At general, this symtom is cause by missing panel data or panel power, so we must
check our wire-harness which connected to panel or the panel power controller
(U202)

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II. (b)The screen had the Vertical Straight Line, might be stuck in Red, Green, Blue
That symptom is cause by bad Panel issue ( might be the Source IC from Panel is cold
solder or open loop ) so REPLACE THE PANEL TO NEW ONE.

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POWER-BLOCK check
**Note : the Waveform of U304 pin 2 can determined the power situation
1. stable rectangle waveform with equal duty, freq around 150K-158KHz
that means all power of this interface board is in normal operation
,and all status of 5V & 3.3V is working well
2. unstable or uneven rectangle waveform without same duty, that means
ABNORMAL operation was happened, check 3.3V or 5V ,if short-circuit or bad
component
3. rectangle waveform with large spike & harmonic pulse on front side , means all
3.3v is no load, U200 GmZAN2 was shut-down, and only U302 MCU still
working , that means the monitor is in power saving status , all power system is
working well .
OK
Check U304 pin 2 is a stable rectangle wave?
Around 150k-158kHz stable rectangle wave
with equal duty without any spike or harmonic
pulse?
OK
NG, with
harmonic
p
ulse
Check U304 pin 2 is a unstable rectangle wave ?
The interface board power is good
Measure input power at U304 LM2596 pin 1=
12V ?
Check ADAPTER and connector if loose?
NG
NG
Check all 3.3V & 5V power, there is
short circuit or bad component was
happened
OK
,
unstable wave
The interface board is in power-
saving state, press power key to wake
up & check your signal input

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III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN’T BE FIXED BY AUTO KEY
** NOTE: There is so many kind of interferences, 1). One is cause by some VGA-CARD
that not meet VESA spec or power grounding too bad that influence our circuit
2).other is cause by external interferences, move the monitor far from electronic
equipment.( rarely happened)
Use DOT-pattern, or win98/99 shut-down
mode pattern, press “AUTO” key, was the
interferences disappear ??
Adjust “FOCUS” step by step, until the
horizontal interferences disappear
Does your signal-cable have an additional
cable for extension ??
END
END
Put away the additional cable
May be the additional cable grounding is
not quite well
Does your noise only exist in one mode only?
(ex: only at 1280x1024 @ 75 Hz, other is normal)
OK
OK
Yes, has extension
NG, interferences still exist
NG
NO additional extension cable
That was cause by you VGA-CARD setting, your VGA
card timing backporch/frontporch exceed vesa timing too
far, for some new AGP-VGA-CARD such situation
always happened
So in your control-panel icon ,select monitor ,setting ,
advance ,screen-adjust,at
Size icon, increase step by step slowly, press “”AUTO”
key every step you increase the SIZE . repeat the
procedure( increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press “APPLY”
to save in your VGA
Yes, only happened on one mode
Change the Signal-cable to new-one or
Try other brand VGA-CARD
(make sure just only that brand VGA-
CARD has this problem ,contact RD-
tai
p
ei
)
NO, all mode

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There is an interferences in DOS MODE
NOTE :the criteria of doing AUTO-CONFIGURATION : must be a full-size screen, if the
screen not full , the auto-configuration will fail. So in dos mode ,just set your “CLOCK” in
OSD-MENU to zero or use some EDITOR software which can full fill the whole screen
(ex: PE2, HE) and then press “AUTO” Or you can use “DOS1.EXE” which attached in
your Driver disk to optimize DOS mode performance
V.THE PANEL LUMINANCE WAS DOWN
Use white pattern and resolution 1280x1024 @ 60Hz , CHROMA 7120 measured the center of panel
Set Contrast, brightness =maximal, RGB= 50
Quit from OSD-screen, measured Y(luminance)
With chroma 7120, check Y= 240±10 CD/M2 ?
Adjust VR201 until maximal, measured Y =
240±10 cd/m2 ?
NG
NG
If the Y less than 160 cd/m2 (after the VR201=
MAX, contrast, brightness = max) then change the
LAMP of panel
If Y can reach ＞190 cd/m2 that means
The lamp still working well, so we just re-do the
white-balance process
As following procedure
OK
Use white-pattern, press MENU button along
with AC power-plug in ( you will in factory
mode) The OSD-menu will be at left-top of
screen,
press AUTO button to automatically adjust
blacklevel value, you will see the sign PASS ,if
FAIL , manual adjust the blacklevel until value 43 !
Set contrast, brightness to max, and turn the VR201
to max , wait for 20 minutes until the luminance Y
stable
The Y should be larger than 200 cd/m2
(for panel which already use for a year, the Y
luminance might be a little down, around 180
cd/m2, there is acceptable too)
Follow this manual page 7 item 4-2 method to
more detail procedure for do a white-balance
adjust
OK