Sony CPD-4401 Service Manual

SERVICE MANUAL

CPD-4401

US Model

Canadian Model

AEP Model

Chassis No. SCC-L30N-A

Picture tube

Video image area

Resolution

Standard image area

Input signal

Video

Sync

SPECIFICA TIONS

0.24 mm (center) -0.25mm (edge) aperture grill pitch 19 inches measured diagonally 90-degree deflection

(18" maximum viewing image) Approx. 364.8 X 273.6 mm (w/h)

3/8

7/8

x 10

7/8

inches)

1/2

inches)

(14

Horizontal: Max. 1600 dots Vertical: Max. 1200 lines

Approx. 352 x 264 mm (w/h) (13

Analog RGB (75 ohms typical)

0.7 Vp-p, Positive Separate Horizontal and Vertical TTL level, Positive or Negative Video Composite (Sync on Green)

0.3 Vp-p

F99

Power Consumption

Maximum Nominal

Deflection frequency

AC input voltage/current

Dimensions

Mass

CHASSIS

140 W, 478 BTU/h 100 W, 341BTU/h

Horizontal: 30 to 107 KHz (automatic) Vertical: 48 to120 Hz (automatic)

100 to 120 V, 50/60 Hz,

1.8A (RMS) at 100VAC

220 to 240V, 50/60Hz,

1.0A (RMS) at 240 VAC

449 x 463 x 463 mm (w/h/d)

2/3

1/5

(17

x 18

Approx. 26.0 kg (57 lb 5 oz)

x 18

1/5

inches)

Design and specifications are subject to change without notice.

TRINITRON® COLOR MONITOR

CPD-4401

POWER MANAGEMENT MODES

If you have VESA's DPMS compliance display card or software installed in your PC, the monitor can automatically reduce its power consumption when not in use. If input from keyboard, mouse, or other input devices is detected, the monitor will automatically "wake up." The following table shows the power consumption and signaling of this automatic power saving feature.

SELF DIAGNOSTIC 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.

TIMING SPECIFICA TIONS

— 2 —

1.5 k

Ω

0.15 µF

AC Voltmeter (0.75 V)

To Exposed Metal Parts on Set

Earth Ground

SAFETY CHECK-OUT

CPD-4401

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 have been replaced. Be absolutely certain that you have replaced all the insulators.

4. Look for unauthorized replacement parts, 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 specified values. Make sure your instruments are accurate; be suspicious of your HV meter if sets always have low HV.

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

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 by any o ne of three methods.

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

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

3. Measuring 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 multimeters tha t hav e 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 SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY P ARTS 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. FOLLOW THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERA TION IS SUSPECTED.

Figure A

AVERTISSEMENT!!

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

ATTENTION AUX COMPOSANTS RELA TIFS A LA SECURITE!!

LES COMPOSANTS IDENTIFIES P AR UNE TRAME ET P AR UNE MARQUE SUR LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES DE PIECES SONT D'UNE IMPORT ANCE 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 MAUV AIS FONTIONNEMENT SUSPECTE.

— 3 —

CPD-4401

Section Title Page

SAFETY CHECK-OUT ............................................................................. 3

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

2. DISASSEMBLY

2-1. Cabinet/Shield Removal ............................................. 1 0

2-2. Service Position ........................................................... 1 0

2-3. D, A, H and N Board Removal ..................................... 10

2-4. Picture Tube Removal ................................................. 11

3. SAFETY RELATED ADJUSTMENT ................................................ 12

4. ADJUSTMENTS ............................................................................ 13

5. DIAGRAMS

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

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

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

1. D Board - Schematic Diagram .............................. 1 9

2. H Board - Schematic Diagram .............................. 2 5

3. N Board - Schematic Diagram .............................. 2 6

4. A Board - Schematic Diagram ............................... 27

5-4. Semiconductors .......................................................... 3 0

6. EXPLODED VIEWS

6-1-1. Chassis (US/Canada Model) ................................... 3 2

6-1-2. Chassis (AEP Model) ................................................ 3 3

6-2. Packing Materials......................................................... 3 4

7. ELECTRICAL P ARTS LIST............................................................ 35

— 4 —

The instructions given are partial abstracts from

Setup

Connect the monitor to your computer system. This monitor will sync to platforms runningat horizontal frequencies between 30 and107 kHz.

Step 1 Make sure the computer system is switched off and attach

the video signal cable to the video output of the computer.

Step 2 Make sure thecomputer is switched offand attach the

power cord to the monitor. Then, attach theother end o f the power cord to a power outlet.

Step 3 Switch onthe monitor and computer. Step 4 Adjust the user controlsaccordingto your personal

preference. Installation is c omplete.

Identifying parts and controls

1 (RESET) button (pages 6, 9)

This button resets theadjustmentsto the factory settings.

2 (AUTOSIZING AND CENTERING) button (page 5)

This button automatically fillsthe screen andadjusts vertical and horizontal centering.

3 (BRIGHTNESS) (v/V) buttons (page 5)

These buttons adjust the picture brightnessand function as the (v/V) buttons whenadjusting other items.

4 (MENU) button (page 6)

This button displays the MENU OSD.

5 6 (CONTRAST) (B/b) buttons(page 5)

These buttons adjust the contrast andfunction as the(B/b) buttons when adjustingother items.

6 1 (POWER) switch and indicator

This button turns the monitor on and off. The indicator lights up green when the monitoris on, andlights up green and orange when the monitor is in Power Saving mode.

7 AC IN connector

This connector provides AC power to the monitor.

8 Video input connector(HD15) (page 5)

This connector inputs RGB video signals and SYNC signals.

Computer

to the videooutput

to a poweroutlet

Power cord

Front

Rear

the Operating Instruction Manual. The page numbers shown reflect those of the Operating Instruction Manual

Precautions

Installation

Do not installthe monitor in the following places:

• on surfaces (rugs, blankets, etc.) or near materials (curtains, draperies) that may block the ventilation holes

• near heat sources such as radiators or air ducts, or in a place subject to direct sunlight

— 5 —

• in a place subject to severe temperature changes

• in aplace subject to mechanical vibration or shock

• on an unstablesurface

• near equipment which generates magnetism, such as a transformer or high voltagepower lines

• near oron an electrically charged metalsurface

Maintenance

• Clean the screen witha soft cloth. If you use a glass cleaning liquid, do not use any type of cleaner containing an anti-static solution or similar additive as this may scratch the screen’s coating.

• Do not rub, touch, or tap the surface of the screen with sharp or abrasive items such as a ball point pen orscrewdriver. Thistype of contact may result in a scratched picture tube.

• Clean the cabinet,panel and controlswith a softcloth lightly moistened with a mild detergent solution. Donot use anytype of abrasive pad, scouring powder orsolvent, such as alcoholor benzene.

Transportation

When you transportthis monitor for repair or shipment, use the original carton and packingmaterials.

Warning on Power Connection

• Use the supplied powercord. If you use a different power cord, be sure thatit is compatiblewith your localpower supply.

For the customers in theUS

If you do not use the appropriate cord, this monitor will not conform to mandatory FCC Standards.

Example of plug types

for 100 to120 V AC for 200 to240 V AC

• Before disconnecting the power cord, wait at least 30 seconds after turning off the power to allow the static electricityon the screen’s surface to discharge.

• After the power is turned on, the screen isdemagnetized (degaussed) for about 3 seconds. This generates a strong magnetic field aroundthescreen, which may affectdata stored on magnetic tapes and disksplaced near the monitor. Besure tokeep magnetic recording equipment, tapes and disks away from the monitor.

The equipment should be installed near an easily accessible outlet.

SECTION 1

GENERAL

CPD-4401

— 6 —

Use of the Tilt/Swivel

This monitor can be adjusted within the anglesshown below. To turnthe monitor vertically or horizontally, hold it at the bottom with both hands.

90°

15°

90°

5°

Video Connector

1234

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

987

15 SCL (serial clock)

Automatically sizing and centering the picture

You can easily adjust the picture to fillthe screen by pressing the Auto Sizing and Centering button.

Press the Auto Sizing and Centering button.

The picture automaticallyfills the screen.

Adjusting the Picture Brightness and Contrast

1 Press the (BRIGHTNESS)v/V or6 (CONTRAST)

B/b buttons.

The BRIGHTNESS/CONTRAST OSD appears.

2 To adjust the brightness.

Press the (BRIGHTNESS) v/V buttons.

To adjust the contrast.

Press the 6 (CONTRAST)B/b buttons.

BRIGHTNESS/CONTRAST

26 26

Customizing Your Monitor

The OSD (On-screen Display) System

Introducing the OSD System

You can adjustmost of the monitor’s settings usingthe OSDs (OnscreenDisplay). All of the OSDs in this illustrationare described on the following pages in order. You can access any of these OSDs from the MENU OSD. To adjust monitorsettings using the OSDs, follow the steps below:

Basic controls:

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

• Use the (BRIGHTNESS) v/V buttons to highlight menu items and to adjust settings.

To adjust the monitor settings: 1 Press the MENU button to display the MENU OSD.

1 2 3 4 5 6 7

Resolutionfor current input signal

1 SIZE/CENTER 2 GEOMETRY 3 COLOR

SIZE/CENTER

4 CONVERGENCE 5 LANGUAGE 6 OPTION

CONVERGENCE

GEOMETRY

LANGUAGE

ENGLISH FRANÇAIS DEUTSCH ESPAÑOL ITALIANO NEDERLANDS SVENSKA

2 Highlight the desired OSD using theBRIGHTNESS buttons and

press the MENU button again.

3 If necessary, use the BRIGHTNESS buttons to selecta specific

item.

4 Adjust the monitor setting using the BRIGHTNESS and

CONTRAST buttons.

• To reset the current item to itsoriginal setting, pressthe (RESET) button whilethe item’s adjustmentOSD is

displayed.

5 When you finish adjustingthe setting,pressthe MENU button to

return to the MENU OSD. Press the MENU button twice to return tonormal viewing.

• Resetting: Ifyou press theRESET button while an OSD is

displayed, only the current adjustment item is reset. For additional information on using the resetfunction, see the “Resetting the Adjustments” sectionon 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

sRGB

OPTION

DEGAUSS

Note

• This function isintended for use with a computer running Windows or similar graphic user interfacesoftware that provides afull-screen picture. It may not work properly if the background color isdark or if the input picture does notfill the screen to theedges (such as anMS DOS prompt).

7 HELP

HELP

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

Adjusting the Settings

4 Adjusting the quality of the

picture (CONVERGENCE)

The CONVERGENCE settings allow you to adjustthe quality of the picture by eliminating red or blue shadows aroundletters, characters and lines. Both settings arestored in memory for all input signals.

Press the MENU button.

The main MENU appears on the screen.

Press the v/V buttons to highlight

CONVERGENCE andpress the MENU button

again.

The CONVERGENCE menu appears on the screen.

First press the v/V buttons to selectthe 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.

5 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 v/V buttonsto highlight LANGUAGE and press the MENUbutton again.

The LANGUAGE menu appears on the screen.

Press the v/V buttons to select thelanguage you prefer.

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

6 Additional settings (OPTION)

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

Press the MENU button.

The main MENU appears on the screen.

Pressthe v/V buttons tohighlight OPTIONand press the MENU buttonagain.

The OPTION menu appears on the screen.

Press the v/V buttons to highlight the desired adjustment item.

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

Degaussing the monitor

The monitor isautomatically degaussed (demagnetized) whenthe power is turned on.

To manually degauss the monitor, first press the

v/V buttons tohighlight (MANUAL DEGAUSS).

Then press only the right 6 b button.

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

Adjusting the moire

To adjust the moire, firstpress the v/V buttons to highlight (MOIRE ADJUST). Then press the 6 B/b buttons to adjustthemoire until theeffect is at a minimum.

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

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

Adjusting the OSD Horizontal Position

To changethe horizontalposition of the OSD,first press the v/V buttons tohighlight (OSD H POSITION). Then press the 6 B/b buttons to adjust the horizontalposition of the OSD.

Adjusting the OSD Vertical Position

To change the verticalpositionof the OSD,firstpress the v/V buttonsto highlight (OSD V POSITION). Then press the 6 B/b buttons to adjust the verticalposition of the OSD.

Locking the controls

To protect adjustment data by locking the controls, first press v/V buttons tohighlight

(CONTROLLOCK). Then press the 6 B/b buttons

to togglethe ControlLock on or off.

Only the 1 (power) switchand MENU buttonwill operate.

Example of moire

OSD H POSITION

OPTION

OSD V POSITION

OPTION

1 Adjusting the size and centering

of the picture (SIZE/CENTER)

— 7 —

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 theMENU button again.

The SIZE/CENTER menuappears 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.

Select To

HORIZONTALCENTERING

VERTICAL CENTERING HORIZONTALSIZING

VERTICAL SIZING

ZOOM

Note

Adjustment stops when either the horizontal or vertical size reaches its maximum or minimum value.

shift the picture to the left or right

shift the pictureup or down enlargeorreducethepicture

width enlargeorreducethepicture

height enlargeorreducethepicture

width and height proportionally

2 Adjusting the shape of the

picture (GEOMETRY)

The GEOMETRY settingsallow you to adjust therotation and shape of thepicture. The rotation settingis stored in memory for all input signals.All other settings are stored in memoryfor the currentinput signal.

Press the MENU button.

The main MENU appears on the screen.

Press the v/V buttons to highlight GEOMETRY and press the MENUbutton again.

The GEOMETRY menuappears on the screen.

First press the v/V buttons to selectthe 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.

Select To

ROT ATION PINCUSHION PIN BALANCE KEYSTONE

KEY BALANCE

3 Adjusting the color of the picture

(COLOR)

The COLOR settings allow you to adjust thepicture’s color temperature by changing the color level ofthe white color field. Colors appear reddishif the temperatureis low, and bluish if the temperature is high.This adjustment is useful for matchingthe monitor’s colors toa printed picture’s colors. This setting is stored in memory for allinput signals.

Press the MENU button.

The main MENU appears on the screen.

Press the v/V buttonsto highlight COLOR and press the MENU buttonagain.

The COLOR menu appears on the screen.

Press the v/V buttons to select a color temperature.

The preset color temperatures are 9300Kand 5000K. Since the defaultsettingis 9300K, the whites change from a bluishhue to a reddish hue as the temperature islowered to 5000K. You can also fine tunethecolor temperature by selecting in step 2 above,and using the 6 B/b buttons to adjustthe color temperaturemanually. You can choosethe optimal Brightness/Contrastsetting by turning the sRGBfeature on. To turnit on, selectsRGB in step 2 above, and press the 6 b button.

This OSD allows you to adjust the colortemperature between 9300K and 5000K. Press the 6 B/b buttons to adjustthe color temperature. The OSD automaticallydisappearsafter about 30 seconds. To close the OSD, press the MENU button again.

Note

The sRGB optimal setting will be undone once the brightness and/or the contrast adjustment is made manually.

rotate the picture expand or contractthe picture sides shift the picturesides to the left orright adjust the picturewidth at thetop of the

screen shift the picture to theleft or right at the

top of the screen

COLOR

9300K 5300K

sRGB

CPD-4401

Restoring the Color Image

If Thin Lines Appear on Your Screen (damper wires)

The lines you may beseeing on your screen arenormal forthe Trinitronmonitor andare nota malfunction.These are shadowsfrom the damper wires that stabilizethe aperture grille,and are most noticeable when the screen’s background islight (usually white). The aperture grille is the essential elementthat makes aTrinitron picture tube uniqueby allowing more lightto reach thescreen, resulting in a brighter, more detailedpicture.

Warning Messages

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

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

1 OutofScanRange

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

2 Power Save Mode

This message indicates that themonitor has reduced powerconsumption.

3 Check Signal Cable (self test pattern)

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

Damper wires

Approx. 7 cm

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

RED GREEN BLUE

WHITE

The color of mostdisplay monitorstendto gradually lose brilliance after several years of usage. The Image Restoration feature allows you to restore the color to the original factory preset levels. To restore the image, first press the v/V buttons to select

(COLOR RETURN). Then press the right 6 b button. A white rectangle appears in the center of the screen while the image is being restored (about two seconds).

OPTION

Resetting the adjustments

Resetting a specific adjustment

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

CPD-4401

COLOR RETURN

— 8 —

Note

Before using this feature, the monitor must be in normaloperation mode for at least 30 minutes. If the monitor goes into power saving mode, you mustreturn the monitor to normal operation mode and wait for 30 minutes forthe monitor to beready. You may need toadjust your computer’s powersaving settings to helpkeep the monitor in normaloperation mode for thefull 30 minutes. Ifthe monitor is not ready, the following message will appear.

7 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 buttonagain.

The HELP OSD appears on the screen.

Press the v/V to selectan optionfrom theHELP menu, then press the MENU button to view theHELP information.

OPTION

AVAILABLE AFTER WARM-UP

COLOR RETURN

HELP

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

Resetting all of the adjustments for the current input signal

PresstheRESETbuttonwhennoOSDisdisplayedonthescreen. Note that the following items are not resetby this method:

• on-screen menu language (page 8)

• on-screen menuposition (page 8)

Resetting all of the adjustment data to the factory presets

Press and hold the reset button for morethan two seconds. This resets everything to the factory presets.

Note

The RESET button does not function when

set to ON.

(CONTROL LOCK) is

— 9 —

Troubleshooting

If the problemis caused by the connected computeror other equipment ,please refer tothe connected equipment’s instructionmanual.

Symptom Check these items No picture

If the 1 (power) indicator is not lit • Check thatthe power cordis properly connected.

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

If the OUT OF SCAN RANGE message appears on the screen

Picture flickers, bounces, oscillates, or is scrambled

Picture is fuzzy • Adjust the brightnessand contrast (page 5).

Picture is ghosting • Eliminate theuse of video cable extensions and/orvideo switch boxes.

Picture is not centered or sized properly

Edgesoftheimagearecurved • Adjust the geometry(page 7). Wavy or ellipticalpattern (moire) is

visible

Color is not uniform • Degauss the monitor* (page 8). If you place equipment that generates a magnetic field, such

White does not look white • Adjust the color temperature (page 7). Letters and lines show red or blue

shadows at the edges Monitor buttons do not operate • IfthecontrollockissettoON,setittoOFF(page8). A hum is heardright after the

power is turned on

* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the bestresult. A hummingnoise may beheard, but this is not a malfunction.

• Check thatthe 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.

xProblems caused by the connectedcomputer orother equipment

• The computeris in powersaving mode. Try pressingany key on the computer keyboard.

• Check thatthe computer’s power is“on.”

• Check thatthe graphic video board is completely seated inthe proper busslot.

xProblems caused by the connectedcomputer orother equipment

• Check thatthe video frequency rangeis within that specified for the monitor. If you replaced an old monitor withthismonitor,reconnect the old monitor andadjust the frequency rangeto the following: Horizontal: 30– 107kHz Vertical:48 – 120 Hz

• Isolate and eliminate any potential sources of electric or magnetic fields such as other monitors, laser printers,electric fans, fluorescentlighting 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 adifferent circuit.

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

xProblems caused by the connectedcomputer orother equipment

• Check yourgraphicvideo board manualfor the proper monitorsetting.

• Confirm that the graphics mode (VESA,VGA, etc.) and the frequencyof the input signal are supported by thismonitor (Appendix). Evenif the frequencyis within the proper range, some graphic videoboards may have a sync pulse that is toonarrow for the monitor to sync correctly.

• Adjust the computer’s refresh rate (vertical frequency)to obtain the best possible picture.

• Degauss themonitor* (page 8).

• Adjust the moire (page 8).

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

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

• Adjust the moire (page 8).

xProblems caused by the connectedcomputer orother equipment

• Change your desktop pattern.

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

• Adjust the convergence (page 8).

• This is thenormalsound of the auto-degauss cycle. When thepoweris turned on, the monitor is automatically degaussed for 5 seconds.

CPD-4401

SECTION 2

DISASSEMBLY

2-1. CABINET/SHIELD REMOVAL

Push in the tip of a screwdriver about 5mm to unlock the claw.

Four screws (+ BVTP 4 x 8)

Three screws (+BVTT 4 x 8)

Side cover

Top cover

Side cover

T o remove the rear cover of the unit, press in and unsnap the claw on the right side of the unit, then press in and unsnap the right claw at the top of the unit. Repeat this with the claw on the left side and top left of the unit and remove.

Bezel assembly

Three screws (+BVTT 4 x 8)

Video shield

2-2. SERVICE POSITION

Cabinet

Two screws (+ BVTP 4 x 16)

Cabinet

Two claws

A board

1 When the D board is placed in service position, the Safety Earth Wire

(black wire) is disconnected.

2 After service is completed and the D board reinstalled, the Safety Earth

Wire must be reattached to the chassis. This must be confirmed before any subsequent procedures are attempted.

Cabinet

Two claws

Three screws (+BVTT 4 x 8)

Bezel assembly

rotate 180º

D board

2-3. D, A, H and N BOARD REMOVAL

Two screws

(BVTT 4 x 8)

H board

N board

D board

One screw

(BVTT 4 x 8)

Five screws

(BVTP 3 x 8)

Holder

One screw

(BVTT 4 x 8)

One screw

(BVTT 4 x 8)

Cable bracket

A board

Three screws

(BVTT 4 x 8)

— 10 —

2-4. PICTURE TUBE REMOVAL

A board

Neck ass'y

Deflection yoke

Two screws

(BVTP 4 x 16)

Four screws

(Tapping screw 5)

Picture tube shield

Demagnetization coil

Tension spring

Two screws

(BVTP 4 x 16)

CPD-4401

Anode-cap

Stand ass'y (D board)

Cushion

REMOVAL OF THE ANODE-CAP

WARNING: Short circuit the anode of the picture tube and the anode-cap to the metal chassis, CRT shield or carbon painted on the

CRT, after removing the anode.

REMOVAL PROCEDURES

1. Turn up one side of the rubber cap in the direction indicated by arrow .

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 damaging 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.

2. Use your thumb to pull the rubber cap firmly in the direction indicated by arrow .

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 .

— 11 —

CPD-4401

SECTION 3

SAFETY RELA TED ADJUSTMENT

When replacing parts shown in the table below, the following operational checks must be performed as a safety precaution against X-ray emissions from the unit.

Part Replaced ( )

HV ADJ RV901

Part Replaced ( )

HV Protector T901 (FBT), R917, R918, R923, R920, Circuit R919, R1004, C920, D911, D912

Beam Current R933, R932, R921, R1006, D915, Protector Circuit D917, IC901, T901 (FBT)

HV Regulator T901 (FBT), IC901, R924, R925, Circuit RV901

Allow the unit to warm-up for one minute prior to checking

the following conditions:

HV Regulator Check

1) Input white cross hatch signal. (fH = 106.3 kHz)

2) CONT and BRT Control normal condition.

3) Input voltage: 120 ± 2 VAC

4) Confirm that the voltage is within the voltage range shown below.

Standard voltage: 27.0KV ± 0.2KV

5) When replacing components identified by sure to recheck the High Voltage.

6) Verify the High Voltage as shown above (27.0KV +0.2KV) is within specification. If not, RV904 on D board.

7) After adjusting the High Voltage within specification, put the RV cover on RV901 as shown below and apply sufficient amount of RTV around RV901.

, make

HV Protector Check

1) Confirm the voltage more than 15.0 VDC between D912 cathode and GND on D Board.

2) Using an external DC power supply, apply the voltage shown below between cathode of D915 on D Board and GND.

Confirm that the HV protector circuit (Hold down) works and CRT screen disappears when applying the voltage protector as shown below.

Standard DC Voltage: 21.1 +0.00 / - 0.05 VDC

Check Condition

• Input voltage : 120 ± 2 VAC

• Input signal : (fH = 31.4 kHz), Cross Hatch

• CONT and BRT Control: Normal Condition

Beam Current Protector Check (Software Logic)

1) Using an external current source, apply 1.68mA from pin of T901 (FBT) to GND on D Board. Confirm that the software logic beam current protector works and that the CRT screen disappears.

Check Condition

• Input voltage : 120 ± 2 VAC

• Input signal : (fH = 31.4 kHz), Cross Hatch

• CONT and BRT Control: Normal Condition

B± Maximum Check

1) Input white cross hatch (fH = 106.3 kHz) signal.

2) Beam control: Normal condition

3) Input voltage: 100 - 120 VAC

Note: Use NF power supply or make sure that distortion factor is 3% or less.

4) Confirm that the voltage is within the voltage range shown below.

Standard voltage: 195.0 -205.0 VDC

RV901

— 12 —

CPD-4401

SECTION 4

ADJUSTMENTS

Connect the communication cable of the connector located on the D board on the monitor. Run the service software and then foll ow these instructions.

IBM AT Computer

as a Jig

1-690-391-21

D-sub (9 Pin [female])

*The parts above ( ~ ) are necessary for DAS adjustment.

mini Din (8Pin)

A-1500-819-A

Interface Unit

4 Pin

4 Pin 4 Pin

Allow a 30 minute warm-up period prior to making the following adjustments:

4-1. Landing Rough Adjustment

1. Enter the full white signal.

2. Adjust the contrast to the maximum.

3. Input full green signal. (Note: Turn off the outputs from R ch and B ch of SG)

4. Move the DY backward and adjust the purity magnet coarsely so that a green raster positions in the center of screen.

5. Moving the DY forward, adjust so that an entire screen becomes pure green.

6. Adjust DY Tilt, use TLV of DY for this adjustment. Fix the Register "TILT" to 0.

7. Lightly tighten the DY screw.

3-702-691-01 Connector Attachment

To BUS CONNECTOR

Fasten wedges so that DY does not move.

14. If landing does not meet specifications, correct with a disc magnet.

15. Perform auto-degauss.

16. Remove sensor and wobbling coil.

17. Confirm that there is no DY tilt. Affix purity magnet on DY using white paint.

4-2. Landing Fine Adjustment

1. Place the set in the Helmholtz coil.

2. Set TLH plate to the zero position.

3. Adjust Purity Magnet on the Neck Assembly to zero position and secure it with white pin.

4-3. Convergence Rough Adjustment

1. Enter the white crosshatch signal.

2. Roughly adjust the H. STAT and V. STAT with a four-pole magnet.

3. Roughly adjust HMC and VMC with a six-pole magnet.

4. Set "VPIN SAW TOP" and "VPIN SAW BTM" to zero position.

5. Display a plain green pattern.

6. Degauss CRT and shield with hand-degausser .

7. Perform auto-degauss.

4-4. Convergence Fine Adjustment

1. Display crosshatch pattern with R and B.

2. Adjust H. STAT and V. STAT with 4-pole magnet. (Do not adjust H.STAT and V.STAT with resistor.)

8. Attach a wobbling coil to the specified position of CRT.

9. Attach a landing adjuster sensor on the CRT.

10. Using a landing checker, adjust the DY position, purity, tilt of DY.

11. Tighten the DY screw.

Clamping torque: 22 ± 2 kg.cm (2.2 ± 0.2 N.m)

12. Perform auto-degauss.

13. Adjust top and bottom pin pitching DY by up and down with two wedges so that (a) is equal to (b)(see the figure at right). Also, leave the yaw of DY to the physical center position with another two wedges.

CRT

TLV VR (Unused)

XCV Core

2 Pole

6 Pole Mg

A Board

Neck Assy

2 Pole (Unused)

4 Pole Mg

TLH Plate

— 13 —

+ 29 hidden pages

Sony CPD-4401 Service Manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

ADJUSTMENTS