Sony CPD-2401 Service manual

SERVICE MANUAL

Trinitron

CPD-2401

US Model

Canadian Model

Chassis No. SCC-L29A-A

Picture tube

Video image area

Resolution

Standard image area

Input signal

Video

Sync

SPECIFICATIONS

0.24-0.25 mm aperture grill pitch 17 inches measured diagonally 90-degree deflection

(16" maximum viewing image) Approx. 327 X 243 mm (w/h)

7/8

5/8

x 9

1/4

x 9

inches)

1/4

inches)

5%, Positiv e

(12

Horizontal: Max. 1280 dots Vertical: Max. 1024 lines

Approx. 312 x 234 mm (w/h) (12

Analog RGB (75 ohms typical)

0.7 Vp-p, Separate HD/VD , TTL Polarity Free External Composite, TTL Polarity Free (2K ohms impedance)

D99

Power Consumption

Deflection frequency

AC input voltage / current

Dimensions

Mass

Design and specifications are subject to change without notice.

CHASSIS

Maximum 120W Minimum 95W

Horizontal: 30 to 85 KHz Vertical: 48 to 120 Hz

100 to 120 V, 50/60 Hz, 1.7A 220 to 240V, 50/60Hz, 0.9A

404 x 414 x 420mm (w/h/d)

15/16

(15

Approx. 18.8 kg (41 lb 7 oz.)

x 16

3/8

x 16

1/2

inches)

MICROFILM

TRINITRON® COLOR MONITOR

CPD-2401

POWER MANAGEMENT

The power saving mode complies with the VESA Display P ower Management Signaling standard. Each state of power management shall be activated by the host computer terminating the appropriate sync signals. Blanking the video must precede termination of the sync signals. The elapsed time counter shall also be controlled by the host computer . Reactivation of the monitor shall be accomplished from the host computer by re-establishing the normal sync signal.

Power consumption Screen Horizontal Vertical Power Recovery time indicator mode (video) sync signal sync signal consumption

1 Normal operation active yes yes < 120 W -- Green 2 Standby (1st mode) blank no yes < 15 W Approx. 3 sec. Green and Orange

Alternate

3 Suspend (2nd mode) blank yes no < 15 W Approx. 3 sec. Green and Orange

Alternate 4 Active-off (3rd mode) blank no no < 3 W Approx. 10 sec. Orange 5 P ower-off -- -- -- 0 W -- Off

SELF DIAGNOSIS FUNCTION

When a failure occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the problem. If there is more than one error, the lamp will identify the first of the problem areas.

Status Area of Failure LED Indication

1 Failure 1 HV or +B Amber (0.5 second)/Off (0.5 second) 2 Failure 2 Amber (1.5 second)/Off (0.5 second) 3 Failure 3 ABL Amber (0.5 second)/Off (1.5 second) 4 Aging/Self Test Amber (0.5 second)/Off (0.5 second)/

H Stop or V Stop

Green (0.5 second)/Off (0.5 second)

TIMING SPECIFICATION

Resolution (H x V)

Ext (H/V)/Polarity

Ext (CS)/Polarity

MODE 123

Dot Clock (MHz)

HORIZONTAL

Hor.Freq. (kHz)

H-Total

H-Blanking

H-Front Porch

H-Sync.

H-Back Porch

H-Active

(µsec)

VERTICAL

Ver. Freq. (Hz)

V-Total

V-Blanking

V-Front Porch

V-Sync.

V-Back Porch

V-Active

(lines)

SYNC.

Int (G)

Int/Non Int

TIMING SPECIFICATION

Primary Mode

640 x 480

25.175

31.469

31.778

25.422

59.940

Non Int

6.356

0.636

3.813

1.907

525

480

Yes -/-

45 10

720 x 400

28.322

31.469

31.777

6.355

0.636

3.813

1.907

25.422

70.087 449

400

Yes -/+

Non Int

800 x 600

— 2 —

56.250

53.674

18.631

4.409

0.569

1.138

2.702

14.222

85.061 631

600

Yes +/+

Non Int

1 3

1024 x 768

1280 x 1024

94.500

68.677

14.561

3.725

0.508

1.016

2.201

10.836

84.997

Yes +/+

Non Int

808

768

135.000

79.976

12.504

3.022

0.119

1.067

1.837

9.481

75.025

1066

1024

Yes +/+

Non Int

1 3

640 x 480

31.500

37.500

26.667

6.349

0.508

2.032

3.810

20.317

75.000 500

480

Yes -/-

Non Int

1 3

TABLE OF CONTENTS

Section Title Page

Safety Check Out Instructions ............................................................... 4

1. GENERAL .................................................................................. 5

2. DISASSEMBLY

2-1. Cabinet Removal............................................................ 9

2-2. Service Position.............................................................. 9

2-3. A and D Board Removal ................................................ 9

2-4. Picture T ube Removal .................................................. 10

CPD-2401

3. SAFETY RELATED ADJUSTMENTS ............................ 11

4. ADJUSTMENTS ..................................................................... 12

5. DIAGRAMS

5-1. Block Diagram .............................................................. 15

5-2. Circuit Boards Location................................................ 18

5-3. Schematic Diagrams and Printed Wiring Boards......... 18

1. A Board - Schematic Diagram ................................ 19

2. D Board - Schematic Diagram ................................ 23

5-4. Semiconductors ........................................................... 30

6. EXPLODED VIEWS

6-1. Chassis......................................................................... 31

6-2. Packing Materials ......................................................... 32

7. ELECTRICAL PARTS LIST ............................................... 33

— 3 —

CPD-2401

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer:

1. Check the area of your repair for unsoldered or poorlysoldered connections. Check the entire board surface for solder splashes and bridges.

2. Check the interboard wiring to ensure that no wires are “pinched” or contact high-wattage resistors.

3. Check that all control knobs, shields, covers, ground straps, and mounting hardware ha ve been replaced. Be absolutely certain that you have replaced all the insulators.

4. Look for unauthorized replacement par ts, particularly transistors, that were installed during a previous repair . Point them out to the customer and recommend their replacement.

5. Look for parts which, though functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement.

6. Check the line cords for cracks and abrasion. Recommend the replacement of any such line cord to the customer.

7. Check the B+ and HV to see if they are specif ied values. Make sure your instruments are accurate; be suspicious of your HV meter if sets alwa ys ha ve low HV.

8. Check the antenna terminals, metal trim, “metallized" knobs, screws, and all other exposed metal parts for AC Leakage. Check leakage as described below.

Leakage Test

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampere). Leakage current can be measured b y any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the man ufacturers' instructions to use these instructions.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measur ing the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The "limit" indication is 0.75 V, so analog meters must have an accurate low voltage scale. The Simpson's 250 and Sanwa SH-63Trd are examples of passive VOMs that are suitable. Nearly all battery operated digital m u ltimeters that have a 2V AC range are suitable. (See Figure A)

WARNING!!

NEVER TURN ON THE POWER IN A CONDITION IN WHICH THE DEGAUSS COIL HAS BEEN REMOVED.

SAFETY-RELA TED COMPONENT W ARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE SCHEMA TIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE CRITICAL FOR SAFE OPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLO W THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERATION IS SUSPECTED.

0.15 µF

To Exposed Metal Parts on Set

1.5 k

Earth Ground

Figure A

AVER TISSEMENT!!

NE JAMAIS METTRE SOUS TENSION QUAND LA BOBINE DE DEMAGNETISA TION EST ENLEVEE.

ATTENTION AUX COMPOSANTS RELA TIFS A LA SECURITE!!

LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE

Ω

AC Voltmeter (0.75 V)

MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE IMPORTANCE CRITIQUE POUR LA SECURITE DU FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY DONT LE NUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU DANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.

— 4 —

BRIGHTNESS/CONTRAST

26 26

SECTION 1

GENERAL

The following are partial abstracts from the Operating Instruction Manual. The page numbers shown reflect those of the Operating Instruction Manual.

— 5 —

Getting Started

Setup

Connect the monitor to your computer system. This monitor will sync to platforms running at horizontal frequencies between 30 and 85 kHz.

Step 1

Make sure the computer system is switched o ff and attach the video signal cable to the video output of the computer.

Computer

to the video output

Step 2

Make sure the computer is switched off and attach the power cord to the monitor. Then, attach the other end of the power cord to a power outlet.

to a power outlet

Step 3

Switch on the monitor and computer.

Step 4

Adjust the user controls accord ing to your personal preference. Installation is complete.

Parts and Controls

Front

(RESET) button (pages 6, 9)

This button resets the adjustments to the factory settings.

(BRIGHTNESS) (

These buttons adjust the picture brightness and function as the

v/V

(

) buttons when adjusting other items.

(MENU) button (page 6)

This button displays the MENU OSD.

(CONTRAST) (

4 6

These buttons adjust the contrast and function as the ( buttons when adjusting other items.

) buttons (page 5)

v/V

) buttons (page 5)

B/b

Rear

(POWER) switch and indicator

5 1

This button turns the monitor on and off. The indicator lights up green when the mo nitor is on, and ligh ts up green and orange when the monitor is in Power Saving mode.

AC IN connector

This connector provides AC power to the monitor.

Video input connector (HD15) (page 5)

)

This connector inputs RGB video signals and SYNC signals.

Power cord

Getting Started Customizing Your Monitor

Use of the Tilt/Swivel

This monitor can be adjusted within the angles shown below. To turn the monitor vertically or horizontally , hold it at the b ottom with both hands.

90°

15°

90°

5°

Video Connector

1234

987

11 12 13 14 15

Pin No. Signal Pin No. Signal

1 Red video 8 Blue return 2 Green video 9 Not used (no pin) 3 Blue video 10 Ground 4 Ground 11 Ground 5 CPU host ground 12 SDA (serial data) 6 Red ground 13 Horizontal Sync 7 Green return 14 Vertical Sync

15 SCL (serial clock)

Adjusting the Picture Brightness and Contrast

Press the (BRIGHTNESS)

buttons.

B/b

The BRIGHTNESS/CONTRAST OSD appears.

To adjust the brightness.

Press the (BRIGHTNESS)

To adjust the contrast.

Press the 6 (CONTRAST)

B/b

v/V

buttons.

or 6 (CONTRAST)

buttons.

CPD-2401

Customizing Your Monitor

Adjusting the size and centering of the picture (SIZE/CENTER)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the

v/V

buttons to highlight SIZE/

CENTER and press the MENU button again.

The SIZE/CENTER menu appears on the screen.

Press the

v/V

buttons to select the desired

adjustment item. Then press the 6

B/b

buttons to

adjust the setting.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

Note

Adjustment stops when either the horizonta l or ve rti cal size reaches its maximum or minimum va lue.

Adjusting the shape of the picture (GEOMETRY)

The GEOMETRY settings allow you to adjust the rotation and shape of the picture. The rotation setting is stored in memory for all input signals. All other settings are stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the

v/V

buttons to highlight GEOMETRY

and press the MENU button again.

The GEOMETRY menu appears on the screen.

First press the

v/V

buttons to select the desired

adjustment item. Then press the 6

B/b

buttons to

adjust the setting.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

Adjusting the color of the picture (COLOR)

The COLOR settings allow you to adjust the picture’s color temperature by changing the color level of the white color field. Colors appear reddish if the temperature is low, and bluish if the temperature is high. This adjustment is useful for matching the monitor’s colors to a printed picture’s colors. This setting is stored in memory for all input signals.

Press the MENU button.

The main MENU appears on the screen.

Press the

v/V

buttons to highlight COLOR and

press the MENU button again.

The COLOR menu appears on the screen.

Press the

v/V

buttons to select a color

temperature.

The preset color temperatures are 9300K and 5000K. Since the default setting is 9300K , the white s change fr om a bluis h hue to a reddish hue as the temperature is lowered to 5000K. You can also fine tune the color temperature by selecting in step 2 above, and using the 6

B/b

buttons to adjust the color

temperature manually.

This OSD allows you to adjust the color temperature between 9300K and 5000K. Press the 6

B/b

buttons to adjust the color temperature. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

Adjusting the Settings

Select To

HORIZONTAL CENTERING

shift the picture to the left or right

VERTICAL CENTERING

shift the picture up or down

HORIZONTAL SIZING

enlarge or reduce the picture width

VERTICAL SIZING

enlarge or reduce the picture height

ZOOM

enlarge or reduce the picture width and height proportionally

Select To

ROTATION

rotate the picture

PINCUSHION

expand or contract the picture sides

PIN BALANCE

shift the picture sides to the left or right

KEYSTONE

adjust the picture width at the top of the screen

KEY BALANCE

shift the picture to the left or r igh t at the top of the screen

COLOR

9300K 5000K

Customizing Your Monitor

The OSD (On-screen Display) System

Introducing the OSD System

You can adjust most of the monitor’s settings using the OSDs (Onscreen Display). All of the OSDs in this illustration are described on the following pages in order. You can access any of these OSDs from the MENU OSD. To adjust monitor settings using the OSDs, follow the steps below:

— 6 —

Basic controls:

• Use the (MENU) button to display the MENU OSD and to select menu items .

• Use the (BRIGHTNESS) items and to adjust settings.

To adjust the monitor settings: 1

Press the MENU button to display the MENU OSD.

Highlight the desired OSD using the BRIG HTNESS bu ttons and press the MENU button again.

SIZE/CENTER

CONVERGENCE

HELP

RETURN TO MAIN MENU RECOMMENDED RESOLUTION FLICKER THIN HORIZONTAL LINE DISTORTED SHAPE OUT OF FOCUS DISCOLORATION

v/V

buttons to highlight menu

Resolution for current input signal

If necessary, use the BRIGHTNESS buttons to select a specific item.

Adjust the monitor setting using the BRIGHTNESS and CONTRAST buttons.

• To reset the current item to its original setting, press the (RESET) button while the item’s adjustment OSD is displayed.

When you finish adjusting the setting, press the MENU button to return to the MENU OSD. Press the MENU button twice to return to normal viewing.



1 2 3 4 5 6 7

GEOMETRY

LANGUAGE

ENGLISH FRANÇAIS DEUTSCH ESPAÑOL ITALIANO NEDERLANDS SVENSKA

• Resetting: If you press the RESET button while an OSD is displayed, only the current adjustment item is reset. For additional information on using the reset function, see the “Resetting the Adjustments” section on page 9.

• Each of the adjustment’s OSD automatically disappears after 30 seconds.

EXIT SIZE/CENTER GEOMETRY COLOR CONVERGENCE LANGUAGE OPTION HELP

80.0kHz/ 75Hz 1280 X 1024

Horizontal/Vertical frequencies for current input signal

COLOR

9300K 5000K

OPTION

CPD-2401

DEGAUSS

Customizing Your Monitor

Using the HELP OSD

Press the MENU button.

The main MENU appears on the screen.

Press the

v/V

buttons to highlight HELP and

press the MENU button again.

The HELP OSD appears on the screen.

Press the

v/V

to select an option from the HELP menu, then press the MENU button to view the HELP information.

Resetting the adjustments

Navigate through the on-screen menus to select the adjustment item you want to reset, and press the RESET button before the OSD disappears.

Press the RESET button when no OSD is displ a yed on the screen. Note that the following items are not reset by this method:

• on-screen menu language (page 8)

• on-screen menu position (page8)

Press and hold the reset button for more than two seconds. This resets everything to the factory presets including the input selectio n.

Note

The RESET button does not function when

(CONTROL LOCK) is

set to ON.

HELP

RETURN TO MAIN MENU RECOMMENDED RESOLUTION FLICKER THIN HORIZONTAL LINE DISTORTED SHAPE OUT OF FOCUS DISCOLORATION

Resetting a specific adjustment

Resetting all of the adjustments for the current input signal

Resetting all of the adjustment data to the factory presets

Adjusting the quality of the

picture (CONVERGENCE)

The CONVERGENCE settings allow you to adjust the quality of

— 7 —

the picture by eliminating red or blue shadows around letters, characters and lines. Both settings are stored in memory for all input signals.

Press the MENU button.

The main MENU appears on the screen.

Press the CONVERGENCE and press the MENU button again.

The CONVERGENCE menu appears on the screen.

Press the 6 convergence, or the vertical convergence.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

Changing the OSD language

(LANGUAGE)

This setting is stored in memory for the current input signal.

Press the MENU button.

The main MENU appears on the screen.

Press the and press the MENU button again.

The LANGUAGE menu appears on the screen.

Press the prefer.

The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

Additional settings (OPTION)

You can manually degauss (demagnetize) the screen, cancel the moire, adjust the OSD horizontal position, adjust the OSD vertical position and lock the controls using the OPTION OSD.

Press the MENU button.

The main MENU appears on the screen.

Press the press the MENU button again.

The OPTION menu appears on the screen.

Press the adjustment item.

Adjust the selected item according to the following instructions. The OSD automatically disappears after about 30 seconds. To close the OSD, press the MENU button again.

buttons to highlight

v/V

buttons to adjust the horizontal

B/b

v/V

buttons to highlight LANGUAGE

v/V

buttons to select the language you

v/V

buttons to highlight OPTION and

v/V

buttons to highlight the desired

v/V

buttons to adjust the

Degaussing the monitor

The monitor is automatically degaussed (demagnetized) when the power is turned on.

To manually degauss the monitor, first press the

buttons to highlight (MANUAL DEGAUSS).

v/V

Then press only the right 6 b button.

The monitor is degaussed for about three seconds. If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result.

Adjusting the amount of the moire cancellation

To adjust the amount of moire cancellation, first press the

buttons to highlight ( MOIRE

v/V

CANCEL). Then press the amount of moire cancellation until the moire effect is at a minimum.

* Moire is a type of natural interference which produces soft, wavy lines on

your screen. It may appear due to interference between the pattern of the picture on the screen and the phosphor pitch pattern of the monitor.

Example of moire

buttons to adjust the

6 B/b

Adjusting the OSD Horizontal Position

To change the horizontal position of the OSD, first press the POSITION). Then press the the horizontal position of the OSD.

buttons to highlight (OSD H

v/V

OPTION

OSD H POSITION

buttons to adjust

6 B/b

Adjusting the OSD Vertical Position

To change the vertical position of the OSD, first press the

buttons to highlight (OSD V

v/V

POSITION). Then press the the vertical position of the OSD.

OPTION

OSD V POSITION

6 B/b

buttons to adjust

Locking the controls

To protect adjustment data by locking the controls, first press (CONTROL LOCK). Then press the toggle the Control Lock on or off.

Only the 1 (power) switch and MENU button will operate.

buttons to highlight

v/V

6 B/b

buttons to

CPD-2401

Additional Information

* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result. A humming noise may be heard, but this is not a malfunction.

Picture is fuzzy

• Adjust the brightness and contrast (page 5).

• Degauss the monitor* (page 8).

• If CANCEL MOIRE is ON, the picture may become fuzzy. Decrease the moire cancellation effect (page 8) or set CANCEL MOIRE to OFF.

Picture is ghosting

• Eliminate the us e of video cable extensions and/or video switch boxes.

• Check that all plugs are firmly seated in their sockets.

Picture is not centered or sized properly

• Adjust the size (page 7) or centering (page 7). Note that some video modes do not fill the screen to the edges.

Edges of the image are curved

• Adjust the geometry (page7).

Wavy or elliptical pattern (moire) is visible

• Cancel the moire (page 8).

Problems caused by the connected computer or other equipment

• Change your desktop pattern.

Color is not uniform

• Degauss the monitor* (page 8). If you place equipment that generates a magnetic field, such

as a speaker, near the monitor, or if you change the direction the monitor faces, color may lose uniformity.

White does not look white

• Adjust the color temperature (page 7).

Letters and lines show red or blue shadows at the edges

• Adjust the convergence (page 8).

Monitor buttons do not operate

• If the control lock is set to ON, set it to OFF (page 8).

A hum is heard right after the power is turned on

• This is the normal sound of the auto-degauss cycle. When the power is turned on, the monitor

is automatically degaussed for 3 seconds.

Symptom Check these items

Additional Information

Warning Messages

If there is something wrong with the input signal, one of the following messages appears.

Out of Scan Range

This message indicates that the current input signal is not appropriate for the monitor’s specificatons.

Power Save Mode

— 8 —

This message indicates that the monitor has reduced power consumption.

Check Signal Cable (self test pattern)

This message indicates that either no input signal is received, or the video cable is not connected.

To solve these problems, see the “Troubleshooting” section below.

Troubleshooting

If the problem is caused by the connected computer or ot her equipment, please refer to the connected equipment’s instruction manual.

Symptom Check these items No picture

If the 1 (power) indicator is not lit • Check that the power cord is pro perly connected.

If the CHECK SIGNAL CABLE message appears on the screen, or if the 1 (power) indicator is either orange or alternating between green and orange

If the OUT OF SCAN RANGE message appears on the screen

Picture flickers, bounces, oscillates, or is scrambled

• Check that the 1 (power) switch is in the “on” position.

• Check that the video signal cable is properly connected and all plugs are firmly seated in their sockets.

• Check that the HD15 video input cable’s pins are not bent or pushed in.

Problems caused by the connected computer or other equipment

• The computer is in power saving mo de. Try pressing any key on the computer keyboard.

• Check that the computer’s power is “on.”

• Check that the graphic video board is completely seated in the proper bus slot.

Problems caused by the connected computer or other equipment

• Check that the video frequency range is within that specified for the monitor. If you replaced an old monitor with this monitor, rec onnect the old m onitor and adjust the frequen cy rang e to the following: Horizontal: 30 – 85 kHz V e rtic a l: 48 – 120 Hz

• Isolate and eliminate any potential sources of electric or magnetic fields such as other monitors, laser printers, electric fans, fluorescent lighting and televisions.

• Move the monitor away from power lines or place a magnetic shield near the monitor.

• Try plugging the monitor into a different AC outlet, preferably on a different circuit.

• Try turning the monitor 90° to the left or right.

Problems caused by the connected computer or other equipment

• Check your graphic video board manual for the proper monitor setting.

• Confirm that the graphics mode (VESA, VGA, etc.) and the frequency of the input signal are supported by this monitor (Appendix). Even if the frequency is within the proper range, some graphic video boards may have a sync pulse that is too narrow for the monitor to sync correctly.

• Adjust the computer’s refresh rate (vertical frequenc y) to ob tain the best possible picture .

INFORMATION

MONITOR IS WORKING OUT OF SCAN RANGE

CHANGE PC SETTING

INFORMATION

MONITOR IS IN POWER SAVE MODE

ACTIVATE USING PC

INFORMATION

MONITOR IS WORKING CHECK SIGNAL CABLE WHITE

RED GREEN BLUE

CPD-2401

SECTION 2

DISASSEMBLY

CPD-2401

2-1. CABINET REMOVAL

Two claws

Cabinet

Two screws

2-2. SERVICE POSITION

PUSH

(BVTP 4 x 16)

2-3. A and D BOARD REMOVAL

A board

PUSH

A board

Two screws

(BVTP 3 x 12)

Five screws

(BVTP 3 x 8)

One screw

Cable stopper

(BVTT 4 x 8)

D board

1 When the D-board is placed in service position, the Safety Earth Wire (green and yellow wire) is disconnected. 2 After service is completed and the D-board reinstalled, the Safety Earth Wire must be reattached to the chassis with the proper screw. This must be confirmed before any subsequent procedures are attempted.

Chassis base

D board

— 9 —

Holder

EMI Shield

CPD-2401

Anode Button

2-4. PICTURE TUBE REMOVAL

WARNING:

BEFORE REMOVING

THE ANODE CAP

High voltage remains in the CRT even after the power is disconnected. T o avoid electric shock, discharge CRT before attempting to remove the anode cap. Short between anode and CRT coated earth ground strap.

Coated Earth Ground Strap

Demagnetization coil

Tension spring

A board

Neck assy

Deflection yoke

Four screws

(Tapping screw 5)

Picture tube shield

Anode cap

Two screws

(BVTP 4 x 16)

Stand ass'y (D board)

Cushion

ANODE CAP REMOVAL

WARNING: High voltage remains in the CRT e v en after the pow er is disconnected. To avoid electric shock, discharge CRT

NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal

before attempting to remove the anode cap. Short between anode and CRT coated earth ground strap.

chassis, CRT shield, or carbon painted on the CRT.

REMOVAL PROCEDURES

1 Turn up one side of the rubber cap in

the direction indicated by arrow a .

2 Use your thumb to pull the rubber

HOW TO HANDLE AN ANODE-CAP

1 Do not use sharp objects which may cause damage to the

surface of the anode cap.

2 Do not squeeze the rubber covering too hard to avoid damag-

ing the anode cap. A material fitting called a shatter-hook terminal is built into the rubber.

3 Do not force turn the foot of the rubber cover. This may cause

the shatter-hook terminal to protrude and damage the rubber.

cap firmly in the direction indicated by arrow b .

3 When one side of the rubber cap

separates from the anode button, the anode cap can be removed by turning the rubber cap and pulling it in the direction of arrow c .

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