Sony GDM-2000TC User Manual

3-759-203-21 (1)

Multiscan® Graphic Display

GDM-2000TC

Operating Instructions
Mode d’emploi

________

1994 by Sony Corporation

Owner's Record

Tin- model tind seriiil numbers me located at the rear ol the
unit. Record the serial number in the space provided Ix'low

Refer to these numbers whenever vou c.ill upon vour dealer
regarding this product.

Model No. GOM-2000TC Serial No.

WARNING

NOTICE

I his notice IS applicable tor USACanada onl\'.
II shipped to USA/Canada, install only a Lll I.ISTI’.D/
eSA I.ABIfl.I.HD [.rower siqiph' cord meeting the
lollowing specifications:
SI’lfClI'ICATlONS

Plug Type Nema-Plug 3-13p

Gord l’vpe SV'F or SJ F, minimum 3x18

AWG
l.ength
Rating

Maximum 13 feet

Minimum 7 A, 125 V

To prex'ent fire or shock hazard, do not expose the unit to

rain or moisture.

Dangerously high voltages are present inside the set. Do not

open the cabinet. Refer servicing to qualified personnel

only.

This equipment has been tested and found to compì)' \s ith
the limits for a Class B digital device, pursuant to Part 13 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, mav cause

harmful interference to radio communications. 1 knve\ er,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined bv turning the equipment off and on, the user is
encouraged to trv to correct the interference bv one or more
of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and
receiver.

- Connect the equipment into an outlet on a circuit different
from thaf to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician

for help.

.You are cautioned that any changes or modifications not
expressly approved in this manual could void your
authority to operate this equipment.

NOTICE

Cette notice s'applique aux Rtnts-Unis et au Canada

U niquement.

Si cet appareil est exporté aux Etats-Unis ou au Canada,

utiliser le cordon d'alimentation portant la mention UL
LISTED/CSA LABELLED et remplissant les conditions

suivantes:

SPECIFICATIONS

Type de fiche Fiche Nema 3-15 broches
Cordon Type SVT ou S|T, minimum .3x18

AWG

Longuer Maximum 13 pieds

Tension Minimum 7 A, 123 V

For the customers in Canada

This apparatus complies with the Class B Limits for radio
noise emissions set out in Radio Interference Regulations.

Pour les utilisateurs au Canada

Cet appareil est conforme aux normes Classe B pour
bruits radioélectriques, spécifiés dans le Règlement sur le
brouillage radioélectrique.

Table of Contents H Checklist

Checklist .................................................................................................>

Setting up................................................................................................4

Using vour monitor

Function of controls................................................................................h

Adjustments............................................................................................7

Using on-screen menus........................................................................IS

Operating through menus...................................................................4

COLOR TEMPHRAI'URF: fine adjustment

Uniformity adjustment
Power saving function

Specifications .......................................................................................12

Use of the tilt-swi\'el..............................................................................12

Troubleshooting ...................................................................................12

................................................................................

....................................

.....................................................................

...................

......................................................

10

10

12

Precautions

Installation

I Pre\'ent internal heat build-up by allowing adequate air

circulation. Do ncit place the unit on surfaces (rugs,
blankets, etc.) nor near materials (curtains, draperies) that

may block the ventilation holes.

' Do not install the unit near heat sources such as radiators

or air ducts, nor in a place subject to direct sunlight,

excessive dust, mechanical vibration or shock.

• Do not place the unit near equipment which generates
magnetism, such as a converter or high voltage power
lines.

Ik-fore using this monitor, please make sure that the
lollowing items are included in your package:

4

CnM-20()0TC Monitor (1)

CDM-20(H)TC Control stand (1)

GDM-CSIO RGB sensor (1)

m

Power cord (1)

Warning on Power Connection

> Use the supplied power cord.

Example of plug shape:

for 100 to 120 V AC

To disconnect the power cord, w-ait for at least ,20 seconds
after turning off the pow'er for discharging the static
electricity on the C'RT display surface.
After the power has been turned on, the CRT is
demagnetized for approximately 5 seconds. This
generates a strong magnetic field around the bezel which
may affect the data stored on magnetic tape or disks near
the bezel. Place such magnetic recording equipment and
tapes/disks at a distance from this unit.

The sxK'ket-outlet shall be installed near the erjuipment
and shall be easily accessible.

for 220 V to 240 V AC

Maintenance

Clean ihe cabinet, panel and controls with a soil cloth
lightly moisteneil with a mild detergent solution. Do not
use anv type ol abr,isi\-e pad, scouring powder or soUx-nt
such <is a Icohol < >r I'len/i ne

Gable damp (1)

Warranty card (1)

Fhis operating mstruction manual (1)

Setting up

1 Set tlie monitor to the control stand.

Do not put your hands between the monitor and
control stand when setting the control stand.
Set the control stand properly so as not to damage it.

Secure the monitor with four screws on right and left sides
of the stand.

4 Connect the AC power cord to the monitor and to a wall

outlet. (Use the shielded AC Power cord included m

your package.)

-asrfin

to a wall outlet

5 Connect the RGB sensor to the PROBE connector.

Be sure to lock all four parts for safety.

3 Put the attached cable clamp on the rear side of the

monitor, connect the signal cord and DC power cord to

the monitor through the clamp, and close up clamp.

Using your monitor

Preset and User Modes

The GDM-2000TC has factory preset modes for the 9 most
popular industry standards for true “plug and play"
capability.

NO.

For less common modes, and modes that evolve in the
future, the GDM-2000TC's highly advanced custom ASIC
will perform all of the complex adjustments necessary to
ensure a high quality for any timing between 31.,5 and
85 kHz. However, due to the wide variety of video board on
the market, it may be necessary for the user to fine tune the
vertical/horizontal size centering.

Resolution (dots x lines)
1 640 X 480
2

720 X 400 31.5 kHz
3 800 X 600
4

832 X 624
5

1024 x768
6 1024 x768 60 kHz
7 1152 x870 68.7 kHz
8 1280 X 1024 64 kHz
9 1280 x 1024

For Windows 3.x users, check your video board
manual or the utility program which comes with
your graphic board and select the highest available
refresh rate to maximize monitor performance.

Horizontal Frequency

31.5 kHz

48.1 kHz

49.7 kHz

56.5 kHz

78.9 kHz

Vertical Frequency
60 Hz
70 Hz
72 Hz
75 Hz
70 Hz
75 Hz .
75 Hz
60 Hz
74 Hz

DVGA is a trademark of IBM Corporation.

2) VESA is a trademark of the non-profit organization. Video
Electronics Standard Association.

3) Macintosh is a trademark of Apple Computer Inc.

VGA Graphic "
VGA Text "
VESA
Macintosh 16" Color
VESA
Macintosh 19" Color
Macintosh 21" Color
STD CAD/CAM
High Refresh CAD/CAM

Graphics Mode

Recommended horizontal timing conditions

Horizontal sync width should be: >1.0 p sec.

Horizontal blanking width should be: >3.0 p sec.

Function of controls

Front

See the pages mentioned for more information.

[H POWER SAVING indicator

Lights up when tlie monitor is in I’ower Saving Mode,
Flashes when the limit \ alue for an adjustment is
reached (page 12).

[2] d) power switch and indicator

Turn the monitor on and off. I he indicator lights up

when the monitor is turned on.

Reset button

Recalls certain factory settings See "Ad|ustments"
section for details (page 7),

g] MENU button

Press to make the menu appear or to return to the
previous menu.

[5] p (brightness) +/- buttons

SEL (select) ♦/♦ buttons

Adjusts the picture brightness in the normal operation
(page 7).
Acts as cursor (►) up/down buttons in the menu
operation.

Rear

2j REMOTE connector

Fhis connector allows any computer with an RS-2.72C
port to act as the host controller. Serial communication
in this connectiir is based on the RS-232C standard,
d’he monitor has a mini DIN-8 serial port. The figure
below illustrates the pin assignment of the RLMC>TE
port.

1. DTR

2. DSR

3. TXD

11 □□ [Zl d] I

ll3) Video input connectors (5 BNC)

The connector accepts RGB \ ideo signals (D.714 Vp-p,

positive)

|- - VIDEO IN --“1

R

4. GND

5. RXD

5. GND

7. OPEN

8. OPEN

Data Transmit Ready (OUT)
Data Set Ready (IN)
Transmit data (OUT)
Signal Ground
Recieve Data (IN)
Ground
Not Used
Not used

|-SYNC IN j

HD,'COMP VD

[6] a (contrast) +/- buttons

ADJUST +/- buttons

Adjusts the picture contrast in the normal operation
(page 7).
Acts ns +/ - adjusting buttons in tlie menu operation.

[7] ENTER key

Press to select the desired item in a menu.

[8] AC IN connector

Plug in an AC power cord.

[9] SIGNAL connector

Connect the control stand's signal cord.

[H DC OUT connector

Connect the control stand's DC power cord.

[11] SERVICE terminal

I'his terminal is to be used bv serx'ice persoiuu'l only

It you use a.computer or video board of high output
level (about 1.0 Vp-p), you may not be able to obtain the

optimum display. In such case, try decreasing the

picture contrast, or use a computer or video board with

a lower output level.

I14I 75D/2 kU selector

Switches the impedance ot the SYNC' IN connector 14

termination to 7^Ll or to 2 ktl When external sync

signals are input, normally set this selector to the 2 kit

position. It good synchroni/ation cannot be obtained, set
this selector to the 7.312 position.

ll5] PROBE connector

Connect the '-uppliei.l RC.B M'Usor.

Adjustments

Adjusting the picture brightness

The adjustment data becomes the common setting tor al
input signals.

Press the O +/- buttons.

♦ SELECT t

-O:

+ " tor more brightness
— lor less brightness

Adjusting the picture contrast

The adjustment data becomes the common setting for all
input signals.
Press the 3 +/- buttons.

- ADJUST +

+

+ for more contrast
~for less contrast

2 Select the item v(hi want to reset to the factory setting

and press ENTER.

If vou si'lect ALL ADjUS'l’MENTS, the menu below
appears.

Select YES and press ENTER to reset.

• If "ALL AOjUSI’ME.NTS" is reset, the brightness ami
contrast are also reset.

. If "COLOR TEMPERATUFRL" is reset, all lour

memory mtides are reset.

• If vou press RESET when either the CCh .OR
TEMPERATURE or COLOR TE.MPERA TURE FINE
ADll.lSTMENT menu (see page K) is on the screen, the

menu belou' appe.irs.

Resetting the picture brightness and contrast

Y(,iu can reset (return to the factory settings of) the picture
brightness and contrast by pressing the - and + (of SELECT
or ADJUST) buttons simultaneously.

Resetting the adjustment

1 Press the RESET button.

RESET

The RESET menu appears on the screen.

RESET
► ALL ADJUSTMENTS

COLOR TEMPERATURE
GEOMETRY.CONVERGENCE

Select YES and press E.NTER to reset.
Onlv the currently selected color temperature mode is
reset.

• If vou press RESEJ when either the CEOV1ETRY or
CONA'ERGENCE menu (see pagi' 8) is on the screen,
the menu beknv' appe.irs.

Select YES and press EN I’ER to reset.

Using on-screen menus

The flow chart below shows the different levels of on-screen

menus that you can use to make various adjustments and

settings. The boxed number is for instructions on page 9.

T] Main menu

MENU

BCF AUTO

► COLOR TEMPO .9300K

UNIFORMITY ON
GEOMETRY
CONVERGENCE

USER CONFIG
DEGAUSS

SELEISADja±l

SFTglRlFNDiMENUl

BCF

U COLOR TEMPERATURE menu

COLOR TEMPERATURE
► 1:9300K(STD)

2;6500K(STD)
3:5000K(STD)
4:3000K(STD)

SEI 1ШАП.1Я+1

g] UNIFORMITY ADJUSTMENT

(see page 10, 11)

n GEOMETRY menu

GEOMETRY
► V CENTER

H CENTER
V SIZE
H SIZE
RASTER ROTATION
PINCUSHION

SELliHADJBEl

EXITSHa

ЕХ1ТЕШШ

g] COLOR TEMPERATURE FINE

1 9300K

► RL:

GL

RH
GH

SELSBADJGEI

BL:

BH;

0
0
0
0

0
0

[7j V CENTER
in H CENTER
[9] V SIZE
ill H SIZE
[il] RASTER ROTATION

|12] PINCUSHION

FXITlMgNul

H CONVERGENCE menu

CONVERGENCE
► V CONV

H CONV

SELdBADJEB

m USER CONEIG menu

USER CONFIG
► CLAMP AUTO

MENU POSI CENTER

SELSEIADJEl+l

[i| degauss

ЕХ1Т1ШШ1

ЕХ1ТШШ)

■n:

I

V CONV

i H CONV

HtI clamp

|18] MENU POSITION

8

Operating through menus

There are six buttons for menu operations on the front of the
stand. To display the main menu, press MENU at first.

Functions of the buttons

Button Function

MENU Returns to the previous menu.
SELECT ♦/♦

ADJUST+/-

ENTER

Moves the cursor (►) upwards or
downwards.

Increases or decreases the value.
Selects an item.

Front of the stand

MENU

[T] Main menu

Select an item and press ENTER to go to the following
menu.

[2] BCF

Selects the BCF (Beam Current Feedback) mode. This m.ode
detects and controls the CRT beam current to stabilize the
white balance. This will keep color reproduction stabilized

even when you see the unit for a long time.

4- SELECT 4-

— П о

AUTO; automatically detects the current.
MANUAL: detects the current when you press ENTER.

The following are not malfunctions:

• White horizontal lines appear in the upper
end of the screen. This happens when the
lines are detecting the beam current.

• The "BCF" flashes in yellow in the menu

screen. This happens when the beam current
detection and control operation are activated.

Ш COLOR TEMPERATURE menu

Selects the color temperature from 1-4 settings. You
can adjust the range setting from 3000 К to 9300 К in
increments of 100 K.

The factory setting for the color temperature of each
mode is as follows:

Mode Color temperature

1 9300 К User-adjustable
2

6500 К
3 5000 К User-adjustable
4 3000 К User-adjustable

[4] COLOR TEMPERATURE FINE ADJUSTMENT menu

Press MENU while pressing ENTER in the COLOR

TEMPERATURE menu to select this menu. You can

finely adjust the RGB to fine-tune the color temperature
with this menu. For details, see page 10.

[5] UNIFORMITY ADJUSTMENT

Automatically detects and corrects the non-uniformity of
RGB and brightness over the whole screen by using the
attached RGB sensor. The RGB and brightness for the
rest of the screen are corrected by standardization with
the center.

Side effects such as luminance decrease in the center will

not occur.

— ADJUST +

D D

Adjustment status

User-adjustable

ENTER

ON: Correction activated.
OFF: Correction not activated.

If you cannot obtain uniform RGB or luminance
immediately after setting up the unit, or even
while correction is activated, do the Uniformity
adjustment procedure on pages 10 and 11.

Ш GEOMETRY menu

Select an item and press ENTER to go to the following
menu.

Ш V CENTER

Adjusts the vertical centering. Press -t to move the
picture up and press - to move it down.

[8] H CENTER

Adjusts the horizontal centering. Press -r to move the

picture to the right and press - to move it to the left.

d] V SIZE

Adjusts the vertical picture size. Press + to enlarge the

vertical size and press - to diminish it.

m H SIZE

Adjusts the horizontal picture size. Press -r to enlarge the
horizontal size and press - to diminish it.

И RASTER ROTATION

Correct the picture rotation. Press -i- to rotate the picture
clockwise and press - to rotate it counterclockwise.

т PINCUSHION

Correct the picture pincushion. Press + to expand the

picture sides and press - to diminish them.

m CONVERGENCE menu

Select an item and press ENTER to go to the following

menu.

И V CONV

Adjusts the vertical convergence. Press + to move Red
up and Blue down. Press - to move Red down and Blue
up.

51 H CONV

Adjusts the horizontal convergence. Press -i- to move Red
to the right and Blue to the left. Press - to move Red to
the left and Blue to the right.

51 USER CONFIG menu

Select an item and press ENTER to go to the following
menu.

51) CLAMP

With certain video signals, the background level may
appear too bright or greenish. If the brightness controls
cannot correct the problem, reset the clamp pulse to
obtain the correct black background level. Also reset the
clamp pulse when the "BCF" flashes in magenta

repeatedly. You can select AUTO or SYNC ON G.

51 MENU POSITION

You can select the menu display position from among
CENTER, UPPER LEFT, UPPER RIGHT, LOWER

RIGHT, and LOWER LEFT.

51 DEGAUSS

Demagnetizes the screen. Wait for 20 minutes or more
before activating this feature again.The same interval is
needed after turning on the monitor. The wave-like
movement on the screen is not failure. 0

Using on-screen menus

COLOR TEMPERATURE FINE Adjustment

This feature allows you to finely adjust the white on the

screen.

Press MENU while pressing ENTER in the COLOR
TEMPERATURE menu. The message below appears:

RL: 0
GL: 0

BL: 0

RH; 0

GH:0

BH: 0

RL, GL and BL adjust the dark white (gray) part of the
screen; RH, GH, and BH adjust the bright white part in the
screen. Set the values of the items from a min. of -128 to a
max. of +127 by pressing the ADJUST +/- buttons. Press +
repeatedly to increase the value, and press - to decrease the
value.

Items with any value other than 0 show that the white point
is out of the standard color temperature curve by the given

value. The (STD) indicator by the color temperature
indicators disappears.

Uniformity adjustment

You can correct the non-uniformity of the color or the
luminance by using this feature.

Before proceeding, connect the RGB sensor to the PROBE
connector on the right side of the stand, and demagnetize

the screen with the DEGAUSS feature explained on page 9.

1 Select UNIFORMITY ADJUSTMENT in the main

menu.

The search miessage appears.

1. Place Sensor in
UPPER LEFT CORNER.

2. Click an(j hold

Put the RGB sensor on the upper left corner of
the screen and click it.

The search message appears.

fxitTmenuI

If the limit value is reached when setting, the operation
stops. Further adjustments to the color configuration may

not be possible even if the values change. The limit value
varies, depending on the color temperature item.
When actually adjusting. Because adjustment of the gray
part and the white part effect each other a little, you may
need to readjust the RL, GL, BL, RH, GH and BH items,
until you get the desired color configuration for both the
gray and white parts.

The chart below presents the RGB configuration.

R(Red)

Yellow

G (Green)

You can easily change a color function by increasing or
decreasing the color function values.

For example:
You can increase the R (Red) function by increasing R.
You can increase the yellow function by increasing R or G,
or by decreasing the B. Decreasing B makes the yellow
darker than the increasing R or G. Similar results occur for
magenta and cyan by adjusting the corresponding color

functions.

1. Place Sensor tn
LOWER RIGHT CORNER

2. Click and hold

Put the sensor on the lower right corner of the
screen and click it.

fxitTmenuI

The message below appears.

SENSOR CALIBRATION

1. Place Sensor over
Black Sguare

2. Click and hold

CD

FXITIMENUI

10

Note on steps 2 and 3

Do not place the sensor out of the displayed picture or
remove the sensor from the screen until the next message
appears. Place the sensor vertically to the screen.

Displayed
picture

4 Put the sensor on the mark and click it.

A sensor mark flashes on the screen and the message

below appears.

UNIFORMITY ADJUSTMENT
1 - Place Sensor over

Black Square

2. Click and hold until
NEXT Square appears

3 Repeat Process

□

5 Put the sensor on the mark and click it.

81 ,(9 X 9) marks appear sequentially. After you click the

last one, the finish message appears.

ADJUSTMENT COMPLETE

Press ENTER Key

SETEEIIS) EXlTtMENu)

Do not remove the sensor from the screen, until
the next black square appears. If the next mark
does not appear after a few seconds, there may
be a detection error. Reconfirm the location of
the mark, by placing the sensor on the mark

again, and click it.
' Press MENU to stop the adjustment.
' Place the sensor vertically to the screen to shield

the sensor from the outer light.

FXITTMT)

6 Press ENTER.

The menu appears.

11

Power saving function

rhis monitor is capable of 2 states of reduced power

consumption.

State

1

2

3

Power Saving Operation

• If one of the H-sync or V-sync signals is absent, the unit
enters the Suspend state.

• If both the H-Sync and V-Sync signals are absent, the unit
enters the Active-off state.

Normal operation

Suspend

(1st step of power saving)

Active-off

(2nd step of power saving)

Power consumption

1007<

approx. 10% approx. 3 sec.

approx. l°!o approx. 10 sec. off

Specifications

Picture tube

Resolution

Effective picture size

Display picture size

Deflection frequency

0.31 mm phosphor trio pitch
20 inches measured diagonally
(19" visual)
90-degree deflection

Horizontal: Max. 1280 dots

Vertical; Max. 1024 lines

Approx. 388 X 292 mm (w/h)
(15 i:: 11 Vj inches)
Approx. 350 X 280 mm (w/h)
(13 ’/k X 11 '/s inches)
or
360 X 270 mm (w/h)

(14 '/j X 10 Vi inches)
Horizontal: 31.5 to 85 kHz
Vertical; 50 to 150 Hz

By sensing the absence of one or both sync signals coming
from the host computer, it will reduce power consumption
as follows.

Required

resumption time

—

(!) Power
indicator

green on

green on

POWER SAVIG

indicator

off

orange on

orange on

CAUTION: The Power Saving function will automatically

put the monitor into the Active-off state if the
power switch is turned on without any video
signal input. Once the horizontal and vertical
syncs are sensed, the monitor will automatically
return to its Normal operation state.

Color temperature
Input

AC input voltage/current

Dimensions

Mass
Optional accessory

3000 K - 9300 K (1 step 100 K)

R/G/B: 75Q BNC

0.714 Vp-p, Positive
Sync on Green: 0.286 Vp-p, Negative

External sync: 1-5 Vp-p, Negative or
Positive
HD/VD or Composite sync: 2 kii/
75D BNC

100 to 120 V, 50/60 Hz, 3.0 A

220 to 240 V, 50 - 60 Hz, 1.8 A
474 X 513 X 529 mm (w/h/1)

(length including the control stand)
(18 Vi X 20 '/4 X 20 ^/» inches)

Approx. 33 kg (72 lb 12 oz)
TC WARE for Mac: GDM-CWlOO

(Device Profile/Display control

software)

Use of the tilt-swivel

With the tilt-swivel, this unit can be adjusted to be viewed
at your desired angle within 90° horizontally and 20°

vertically.

To turn the unit vertically and horizontally, hold it at its

bottom with both hands as illustrated below.

12

Design and specifications are subject to change without
notice.

Troubleshooting

This section m<iy liolp yon isoUite the problem and as a result, eliminate the need to contact technical support and allow
continued productivity.

Symptom Check these items

No picture

If neither (!) (power)
indicator nor I’OWHK

SAVINti indicator is lit

IfPOWKR SAVING
indicator is lit

If Ci) (power) and I’OWER

SAVING indicators are

both flashing

I’icturc is scrambled

Color is not uniform • Trip the power switch once to activate the Auto degauss cycle, or activate the DEGAUSS feature in the

White does iiot look white

Screen image is not centered
Screen image size is not

right

Screen image is tilted

Edges of the image are

curved

Red or blue shades are
found at the edge of images

Picture is fuzzy

Picture bounces or has wavy
oscillations

Uniformity adjustment
cannot be done

"BCE" flashes in magenta
repeatedly.

• Check that the power cord is prtiperlv connected.

• Check that the power switch is in the "ON" position.

• Check that your computer power switch is in the "ON" position.

• Check that the video cable is properly connected and all plugs are firmly seated in thc'ir sockets.

- • Ensure that no pins are bent or pushed in tlie HD13 connector of the cable.

• Check that the video card is seated completely in a proper bus slot. There may be a particular bus slot
specified for your video board to be seated among 8, 16, and VL-Bus slots.

• If the impedance switch on the back of the monitor is set to trv switching to 2 ki l.

• Check that the video sync signal is within that specified for the monitor.
(fH: 31.3 - 85 kHz, fV:' 50 - 150 Hz)

• If using a Mac system, check that a proper HD15-015 adaptor is provided to work correctly with vour Mac.

• Check that the signal cable and 1X2 cable are connected to the monitor.

• If the impedance switch on the back of the monitor is set to 75U, turn off the monitor, move the switch to 2
ki2, and turn on the monitor. If the indicators are still flashing, there is a potential monitor failure. Contact
your dealer.

• If the impedance switch on the back of the monitor is set to 7bil , try switching tt) 2 k£2.

• Check your graphic board manual for proper monitor setting on your GDM-20()()TC,

• Check this manual and confirm that the graphic mode and the frequency at which you are trying to
operate is supported. Even within the proper range some video boards may have a sync pulse that is too
narrow for the monitor to sync correctly.

main menu (page 9). This function is to demagnetize the metal frame of the CRT to obtain neutral field for
uniform color reproduction. If a second degauss cycle is needed, allow a minimum interval of 20 minutes
for the best result.

• Do the Uniformity adjustment procedure properly (page 10, 11).

• Check that the 5 BNC's are connected in the right order, (from power cord side: Ked-Green-Blued ID-VD)

• Perform the color temperature adjustment (page 9).

• If the'video format is not listed in the compatibility table on page 6, there may be a background level

problem (background too bright or greenish). Try the black level clamp toggle switch (page 9).

• Adjust the V CENTER or H CENTER in GEOMETRY menu (page 9),

• Adjust the V SIZE or H SIZE (page 9).

• Some video modes do not fill the screen to the edge of the monitor. There is no single answer to solve the
problem. There is a tendency to have this problem on higher refresh timings and Macintosh video timings.

• Adjust the "RASTER ROTATION" in the GEOMETRY menu (page 9).

• Adjust the "PINCUSION" in the GEOMETRY menu (page 9).

• Adjust the "V CONV" or "H CONV" in the CONVERGENCE menu (page 9).

• Adjust the "Contrast" and "Brightness" controls (page 7). We have come across several brands of SVGA
boards that have an excessive video output level which creates fuzzy picture at max contrast.

• Trip the power switch once to activate the Auto-degauss cycle. This function demagnetizes the metal

frame of the CRT to obtain a neutral field for uniform color reproduction. If a second degauss cycle is
needed, allow a minimum interval of 20 minutes for the best result.

• If a white line shows color shades, adjust the "V CONV" or "11 CONV" setting in the CONVERGENCE

menu to see if the shades are eliminated.

• Move electrical (magnetic) devices that may be creating etpc'trical interference away from the monitor.

• If you have another monitor dose to this monitor, increase the distance between them to reduce the

interference.

• Your office may have electric power wiring behind the wall. Move the monitor away from the wall.

• Check that the RGB sensor is correctly connected.

• C heck that you place on the RGB sensor on the correct screen position.

• Try setting the clamp pulse again (see page 9).

If the problem persists, call your authorized Sony dealer from a location near your monitor.

Note the model name and the serial number of your monitor. Also note the make and name of your computer and video

board.

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