IBM 6556, 03N, 43N, 03S, 43S Service Manual

6556-03N/43N/03S/43S

SERVICE MANUAL

6556-03N/43N/03S/43S

6556-03N/43N

N. Hemisphere Model

AEP Model

Japan Model

Chassis No. SCC-L07G-A

6556-03S/43S

S. Hemisphere Model

Chassis No. SCC-L07G-A

Picture tube 0.25 mm aperture grill pitch

Video image area (16" maximum viewing image)

Logical resolution Horizontal: Max. 1280 dots

Physical resolution Horizontal: Max. 1024 dots

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

MODEL

BODY COLOR DESTINATION

6556-03N NH, AEP, J

PEARL WHITE

6556-03S SH

17 inches measured diagonally 90-degree deflection

Approx. 327 x 242 mm (w/h)

7/8

3/8

x 9

5/8

inches)

1/4

inches)

(12

Vertical: Max. 1024 lines

Vertical: Max. 768 lines

SPECIFICATION

SPECIFICATIONS

Input signal

Power Consumption

Deflection frequency Horizontal: 30 to 85 KHz

AC input voltage / current 100 to 120 V, 50/60 Hz, 1.9 A

Dimensions 408 x 441 x 434 (w/h/d)

Mass Approx. 19.2 kg (41 lb 14 oz)

Design and specifications are subject to change without notice.

D1H

Video Analog RGB (75 ohms typical) Sync External HD/VD, Composite

Maximum 120W Nominal 100W, 341 BTU/h

0.7 Vp-p, Positive Polarity Free TTL

Video Composite (Sync on Green)

0.3 Vp-p, Negative

Vertical: 50 to150 Hz

220 to 240V, 50/60Hz, 1A

1/8

(16

x 17

CHASSIS

3/8

1/8

x 17

inches)

6556-43N NH, AEP, J

STEALTH GRAY

6556-43S (Black) SH

COLOR MONITOR

— 1 —

6556-03N/43N/03S/43S

(G)

(

(CS)

POWER SAVING FUNCTION

This monitor has three Power Saving modes. By sensing the absence of a video signal from the computer, it reduces power consumption as follows:

State

1 Normal Operation

2 Standby (1st mode)

3 Suspend (2nd mode)

4 Active-off (3rd mode)

Power

Consumption

<110W

<1 5W approx. 3 sec.

<8W approx. 10 sec. Orange 5 Power-off 0W 6 Failure mode

 

NOTE:

If no video signal is input to the monitor, the "NO INPUT SIGNAL" message appears. After about 30 seconds, the Power Saving function automatically puts the monitor into active-off mode and the indicator lights up orange. Once the monitor detects horizontal and vertical sync signals, the monitor automatically resumes normal operation mode.

Required Recovery

Time



Power Indicator

Green on

Green and orange

alternate

Green and orange

alternate

Off

Orange flashing

TIMING SPECIFICATION

MODE 12345 6 7 8 Resolution (H x V) 656x496 640X480 640x480 800x600 800x600 1024x768 1024x768 1280x1024 Dot Clock (MHz) 25.175 31.500 36.000 49.500 56.250 78.750 94.500 135.000

HORIZONTAL

Hor. Freq. (kHz) 31.469 37.5 43.269 46.875 53.674 60.023 68.677 79.976 H-Total 31.778 26.667 23.111 21.333 18.631 16.66 14.561 12.504 H-Blanking 5.72 6.349 5.333 5.172 4.409 3.657 3.725 3.022 H-Front Porch 0.318 0.508 1.556 0.323 0.569 0.203 0.508 0.119 H-Sync. 3.813 2.032 1.556 1.616 1.138 1.219 1.016 1.067 H-Back Porch 1.589 3.81 2.222 3.232 2.702 2.235 2.201 1.837 H-Active (msec) 26.058 20.317 17.778 16.162 14.222 13.003 10.836 9.481

VERTICAL

Ver. Freq. (Hz) 59.94 75 85.008 75 85.061 75.029 84.997 75.025 V-Total 525 500 509 62 5 631 800 808 1066 V- Blanking 29 2 0 2 9 2 5 3 1 32 40 42 V-Front Porch 21111 1 1 1 V-Sync. 23333 3 3 3 V- Back Porch 2 5 1 6 2 5 2 1 2 7 2 8 3 6 3 8 V-Active (lines) 496 480 480 600 600 768 768 1024

SYNC.

Int

NO NO NO NO NO NO NO NO

Ext

H/V)/Polarity YES -/- YES -/- YES -/- YES +/+ YES +/+ YES +/+ YES +/+ YES +/+ Ext Int/Non Int Non Int Non Int Non Int Non Int Non Int Non Int Non Int Non Int

/Polarity NO NO NO NO NO NO NO NO

— 2 —

SAFETY CHECK-OUT

6556-03N/43N/03S/43S

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 poorly-soldered 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 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 by any one 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 that have a 2V AC range are suitable. (See Fig. A)

WARNING!!WARNING!!

WARNING!!

WARNING!!WARNING!!

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

SAFETY-RELATED COMPONENT WARNING!! 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 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. FOLLOW 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

AVERTISSEMENT!!

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

ATTENTION AUX COMPOSANTS RELATIFS A LA

AC Voltmeter (0.75 V)

LES COMPOSANTS IDENTIFIES P AR UNE TRAME ET PAR UNE 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 D ANS 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 PR OCEDURES LORS DE CHAQUE REMPLA CEMENT DE COMPOSANTS CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE

SECURITE!!

— 3 —

6556-03N/43N/03S/43S

Section Title Page

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

2. DISASSEMBLY

2-1. Cabinet Removal ............................................................10

2-2. EMI Shield Removal .................................................... 10

2-3. Service Position .............................................................. 10

2-4. D and A Board Removal................................................ 10

2-5. Picture Tube Removal ................................................... 11

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

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

5. DIAGRAMS

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

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

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

1. D Board - Schematic Diagram ................................. 19

2. A Board - Schematic Diagram .................................23

5-4. Semiconductors ..............................................................27

6. EXPLODED VIEWS

6-1. Chassis (for models made in US only) ........................29

6-2. Chassis (for models made in UK only) ..................... 29

6-3. Packing Materials .......................................................... 30

7. ELECTRICAL PARTS LIST ................................................ 31

— 4 —

The instructions given here are partial abstracts from the Operating Instruction

Getting Started

Precautions

Installation

• Prevent internal heat build-up by allowing adequate air circulation. Do not place the monitor on surfaces (rugs, blankets, etc.) or near materials (curtains, draperies) that may block the ventilation holes.

• Do not install the monitor near heat sources such as radiators or air ducts, or in a place subject to direct sunlight, excessive dust, mechanical vibration or shock.

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

Maintenance

• Clean the cabinet, panel and controls with a soft cloth lightly moistened with a mild detergent solution. Do not use any type of abrasive pad, scouring powder or solvent, such as alcohol or benzine.

• Do not rub, touch, or tap the surface of the screen with sharp or abrasive items such as a ballpoint pen or screwdriver. This type of contact may result in a scratched picture tube.

• Clean the screen with a 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.

Transportation

When you transport this monitor for repair or shipment, use the original carton and packing materials.

Use of the Tilt-Swivel

With the tilt-swivel, this monitor can be adjusted to the desired angle within 180° horizontally and 20° vertically. To turn the monitor vertically and horizontally, hold it at the bottom with both hands as illustrated below.

Getting started

90°

15°

5°

for 100 to 120 V AC for 200 to 240 V AC

for 240 V AC only

Warning on power connection

• Use an appropriate power cord for your local power supply.

Examples of plug types:

• Before disconnecting the power cord, wait at least 30 seconds after turning off the power to allow the static electricity on the CRT display surface to discharge.

• After the power has been turned on, the CRT is demagnetized (degaussed) for about 5 seconds. This generates a strong magnetic field around the metal frame, which may affect the data stored on magnetic tapes and disks near the bezel. Place magnetic recording equipment, tapes and disks away from this monitor.

The outlet should be installed near the equipment and be easily accessible.

Getting Started

ES C

Identifying Parts and Controls

See the pages in parentheses for further details.

Front

1 ? (reset) button (page 12)

Resets the adjustments to the factory settings.

2 EV button (page 13)

Selects the Enhanced Video (EV) mode.

3 ¨ (brightness) (./>) buttons (pages 4 –

12)

Adjust the picture brightness. Function as the (./>) buttons when adjusting other

items.

4 button (pages 5 – 13)

Displays the MENU OSD.

5 > (contrast) (?//) buttons (pages 4 – 12,

17)

Adjust the contrast. Function as the (?//) buttons when adjusting other

items.

6 u (power) switch and indicator (pages 14,

17)

Turns the monitor on or off. The indicator lights up in green when the monitor is turned on, and lights up in orange when the monitor is in power saving mode.

Rear

7 AC IN connector

Provides AC power to the monitor.

8 Video input connector (HD15)

Inputs RGB video signals and SYNC signals.

Pin No. 1 2

3 4 5 6 7

Pin No. 8 9 10 11 12

13 14 15

Signal Red Green

(Composite Sync on Green)

Blue ID (Ground) DDC Ground* Red Ground Green Ground

Signal Blue Ground — Ground ID (Ground) Bi-Directional

Data (SDA)* H. Sync V. Sync Data Clock(SCL)*

* Display Data Channel (DDC) Standard of VESA

1 2

3 4

9876

11 12 13 14 15

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

SECTION 1

GENERAL

— 5 —

6556-03N/43N/03S/43S

Getting Started

to a power outlet

to AC IN

Power cord

To a computer with an HD15 video output

Setup

This monitor works with platforms running at horizontal frequencies between 30 and 85 kHz.

Step 1: Connect the monitor to the

computer

With the computer switched off, connect the video signal cable to the video output of the computer.

Note

Do not short the pins of the video signal cable.

Step 2: Connect the power cord

With the monitor switched off, connect one end of the proper power cord for your local supply to the monitor and the other end to a power outlet.

Step 3: Turn on the monitor and computer

The installation of your monitor is complete.

Note

If “OUT OF SCAN RANGE” or “NO INPUT SIGNAL” appears on the screen, see “Warning Messages” on page 15.

Before adjusting

• Connect the monitor and the computer, and turn them on.

Selecting the On-screen Display Language

If you need to change the OSD language, see “Using the LANG (Language) On-screen Display” on page 12. The default setting is English.

Horizontal Frequency*

Vertical Frequency*

BRIGHTNESS/CONTRAST

26 26

60.0kHz/ 85Hz

Adjusting the Picture Brightness and Contrast

Once the setting is adjusted , it will be stored in memory for all input signals received.

1 Press the ¨ (brightness) ./> or > (contrast) ?//

buttons.

The BRIGHTNESS/CONTRAST OSD appears.

2 For brightness adjustment

Press the ¨./> buttons.

> . . . for more brightness

. . . . for less brightness

For contrast adjustment

Press the >?// buttons.

/ . . . for more contrast ? . . . for less contrast

The OSD automatically disappears after about 3 seconds.

To reset, press the ? (reset) button while the OSD is on. The brightness and contrast are both reset to the factory settings.

* The horizontal and vertical frequencies for the received input

signal appear in the BRIGHTNESS/CONTRAST OSD.

Customizing Your Monitor

Getting Started

ES C

Customizing Your Monitor

Introducing the On-screen Display System

Most adjustments are made using the MENU OSD.

MENU OSD

Press the button to display the MENU OSD.

This MENU OSD contains links to the other OSDs described below.

COLOR

Displays the COLOR OSD for adjusting the color temperature.

2 CENTER

Displays the CENTER OSD for adjusting the centering of the picture.

3 SCREEN

Displays the SCREEN OSD for adjusting the vertical and horizontal convergence, etc.

4 ZOOM

Displays the ZOOM OSD for enlarging and reducing the picture.

OPTION

Displays the OPTION OSD for adjusting the OSD position and degaussing the screen, etc.

6 SIZE

Displays the SIZE OSD for adjusting the picture size.

7 LANG

Displays the LANGUAGE OSD for selecting the language.

GEOM

Displays the GEOMETRY OSD for adjusting the picture rotation and pincushion, etc.

9 EXIT

Closes the MENU OSD.

EXIT

CENTER

SIZE

GEOM

COLOR

LANG

ZOOM

SCREEN

OPTION

Using the CENTER On-screen Display

The CENTER settings allow you to adjust the centering of the picture. Once the setting is adjusted, it will be stored in memory for the current input signal.

1 Press the

button.

The MENU OSD appears.

2 Press the ¨./> and >?// buttons to select “

CENTER,” and press the

button again.

The CENTER OSD appears.

3 For horizontal adjustment

Press the >?// buttons.

/ . . . to move the picture right ? . . . to move the picture left

For vertical adjustment

Press the ¨./> buttons.

> . . . to move the picture up

. . . . to move the picture down

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

button again.

To reset, press the ? (reset) button while the OSD is on. The horizontal and vertical centerings are both reset to the factory settings.

CENTER

— 6 —

Customizing Your Monitor

Using the SIZE On-screen Display

The SIZE settings allow you to adjust the size of the picture. Once the setting is adjusted, it will be stored in memory for the current input signal.

1 Press the

button.

The MENU OSD appears.

2 Press the ¨./> and >?// buttons to select “

SIZE,” and press the

button again.

The SIZE OSD appears.

3 For horizontal adjustment

Press the >?// buttons.

/ . . . to increase picture width ? . . . to decrease picture width

For vertical adjustment

Press the ¨./> buttons.

> . . . to increase picture height

. . . . to decrease picture height

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

button again.

To reset, press the ? (reset) button while the OSD is on. The horizontal and vertical sizes are both reset to the factory settings.

SIZE

Using the GEOM (Geometry) Onscreen Display

The GEOM (geometry) settings allow you to adjust the shape and orientation of the picture. Once the rotation is adjusted, it will be stored in memory for all input signals received. All other adjustments will be stored in memory for the current input signal.

Press the button.

The MENU OSD appears.

2 Press the ¨./> and >?// buttons to select “

GEOM,” and press the

button again.

The GEOMETRY OSD appears.

3 Press the ¨./> buttons to select the item you want

to adjust.

Select

ROTATION

PINCUSHION

PIN BALANCE

KEYSTONE

KEY BALANCE

adjust the picture rotation

adjust the picture sides

adjust the picture side balance

adjust the picture width

adjust the picture shape balance

ROTATION

GEOMETRY

Getting Started

ES C

Customizing Your Monitor

Press the >?// buttons to adjust the settings.

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

button again.

To reset, press the ? (reset) button while the OSD is on. The selected item is reset to the factory setting.

For

ROTATION

PINCUSHION

PIN BALANCE

KEYSTONE

KEY BALANCE

Press

/ . . . to rotate the picture clockwise

? . . . to rotate the picture counterclockwise

/ . . . to expand the picture sides

? . . . to contract the picture sides

/ . . . to move the picture sides to the right

? . . . to move the picture sides to the left

/ . . . to increase the picture width at the

top

? . . . to decrease the picture width at the

top

/ . . . to move the top of the picture to

the right

? . . . to move the top of the picture to

the left

Using the ZOOM On-screen Display

The ZOOM settings allow you to enlarge or reduce the picture. Once the setting is adjusted, it will be stored in memory for the current input signal.

1 Press the button.

The MENU OSD appears.

2 Press the ¨./> and >?// buttons to select “

ZOOM,” and press the

button again.

The ZOOM OSD appears.

3 Press the >?//buttons to adjust the picture zoom.

/ . . . to enlarge the picture ? . . . to reduce the picture

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

button again.

To reset, press the ? (reset) button while the OSD is on.

Note

The picture zoom adjustment will stop as soon as either the horizontal or vertical size reaches its maximum or minimum value.

ZOOM

73V

26H

— 7 —

6556-03N/43N/03S/43S

Customizing Your Monitor

Resetting the Adjustments

Resetting an adjustment item

Press the , ¨./> and >?//buttons to select the OSD containing the item you want to reset.

2 Press the ¨./> buttons to select the item you want

to reset.

3 Press the ? (reset) button.

Resetting all of the adjustment data for the current input signal

When there is no OSD displayed, press the ? (reset) button.

All of the adjustments data for the current input signal is reset to the factory settings. Note that adjustment data not affected by changes in input signal (OSD language , OSD position and the control lock function) is not reset to the factory settings.

Resetting all of the adjustment data for all input signals

Press and hold the ? (reset) button for more than two seconds.

All of the adjustment data is reset to the factory settings.

Using the LANG (Language) Onscreen Display

English, French, German, Spanish and Japanese versions of the OSDs are available.

1 Press the button.

The MENU OSD appears.

2 Press the ¨./> and >?// buttons to select “

LANG,” and press the

button again.

The LANGUAGE OSD appears.

3 Press the ¨./> buttons to select the desired

language.

ENGLISH: English, FRANÇAIS: French, DEUTSCH: German, ESPAÑOL: Spanish, or

: Japanese.

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

To reset to English, press the ? (reset) button while the OSD is on.

ENGLISH FRANÇAIS DEUTSCH ESPAÑOL

LANGUAGE

Getting Started

ES C

Technical Features

Preset Modes

No.

Technical Features

Resolution (dots × lines)

640 × 480 640 × 480 640 × 480 800 × 600 800 × 600 1024 × 768 1024 × 768 1280 × 1024

Horizontal Frequency

31.5 kHz

37.5 kHz

43.3 kHz

46.9 kHz

53.7 kHz

60.0 kHz

68.7 kHz

80.0 kHz

Vertical Frequency

60 Hz

75 Hz

85 Hz

75 Hz

85 Hz

75 Hz

85 Hz

75 Hz

Graphics Mode

VGA

VESA

Selecting the Enhanced Video (EV) Mode

The Enhanced Video (EV) button allows you to automatically change the characteristics of the picture on the screen to match the use of your monitor. Simply press the EV button to scroll between the three modes.

1 Turn on the monitor and computer. 2

Press the EV button to set the mode.

Each time you press the EV button, the mode appears on the screen and changes as follows.

STANDARD MODE

PRESENTATION MODE

GRAPHICS/VIDEO MODE

The STANDARD MODE is ideal for spreadsheets, word processing, and other text oriented applications.

The PRESENTATION MODE is useful for presentation programs that require vivid colors.

The GRAPHICS/VIDEO MODE gives movies and games enhanced visual appeal by increasing the sharpness and brightness.

The selected mode indication appears on the screen for about 3 seconds.

If the screen appears too white, adjust the color temperature as explained in “Using the COLOR On-screen Display” on page 8.

Customizing Your Display

Displaying the Monitor’s Information

You can display the model name, serial number and year of manufacture using the monitor‘s INFORMATION OSD.

Press and hold the button for 5 seconds.

The INFORMATION OSD appears.

Example:

The INFORMATION OSD includes the model name, serial number and manufactured year.

The OSD automatically disappears after about 30 seconds.

INFORMATION

SER NO : 1234567

MODEL : IBM P72 MANUFACTURED

: 1997

— 8 —

Getting Started

Additional Information

Troubleshooting

This section may help you isolate the cause of a problem and as a result, eliminate the need to contact technical support.

Symptom Check these items

No picture

If the u indicator is not lit

If the “NO INPUT SIGNAL” message appears on the screen, or if the u indicator is either orange or alternating between green and orange

If the “OUT OF SCAN RANGE” message appears on the screen

If no message is displayed and the u indicator is green or flashing orange

Picture is scrambled

Color is not uniform

You cannot adjust the monitor with the buttons on the front panel

Warning Messages

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

The input signal condition

“OUT OF SCAN RANGE” indicates that the input signal is not supported by the monitor’s specifications.

“NO INPUT SIGNAL” indicates that no signal is input.

To solve these problems, see “Troubleshooting” below.

INFORMATION

OUT OF SCAN RANGE

Input signal condition

• Check that the power cord is properly connected.

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

• The screen is blank when the monitor is in power saving mode. Try pressing any key on the computer keyboard.

• Check that your computer 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.

• Ensure that no pins are bent or pushed in the HD15 video input connector.

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

• Check that the video frequency range is within that specified for the monitor. (Horizontal: 30 – 85 kHz, Vertical: 50 – 150 Hz) Refer to your computer’s instruction manual to adjust the video frequency range.

• If you are using a video signal cable adapter, check that it is the correct one.

• See “Self-diagnosis Function” (page 17).

• Check your graphics board manual for the proper monitor setting.

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

• Degauss the monitor (page 10). If you place equipment which generates a magnetic field, such as a loudspeaker, near the monitor, or you change the direction of the monitor, color may lose uniformity. The degauss 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 the control lock function is set to on, set it to off using the OPTION OSD (page 11).

Additional Information

Symptom Check these items

Screen image is not centered or sized properly

Edges of the image are curved

White lines show red or blue shadows at edges

Picture is fuzzy

Picture bounces or has wavy oscillations

Picture is flickering

Picture appears to be ghosting

Wavy or elliptical (moire) pattern is visible

Two fine horizontal lines (wires) are visible

Hum is heard right after the power is turned on

• Adjust the size or centering (pages 5 – 6).

• Some video modes do not fill the screen to the edges. This problem tends to occur with certain video boards.

• Adjust the geometry (pages 6 – 7).

• Adjust the convergence (pages 9 – 10).

• Adjust the contrast and brightness (page 4).

• If red or blue shadows appear along the edges of images, adjust the convergence (pages 9 – 10).

• If the moire is cancelled, the picture may become fuzzy. Decrease the moire cancellation effect (pages 9 – 10).

• Isolate and eliminate any potential sources of electric or magnetic fields. Common causes for this symptom are electric fans, fluorescent lighting or laser printers.

• If you have another monitor close to this monitor, increase the distance between them to reduce the interference.

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

• Try the monitor on a different computer in a different room.

• Set the refresh rate on the computer to obtain the best possible picture by referring to your computer’s manual.

• Eliminate the use of video cable extensions and/or video switch boxes if this symptom occurs. Excessive cable length or a weak connection can produce this symptom.

• Cancel the moire (pages 9 – 10). The moire may be modified depending on the connected computer.

• Due to the relationship between resolution, monitor dot pitch and the pitch of some image patterns, certain screen backgrounds sometimes show moire. Change your desktop pattern.

• These wires stabilize the vertically striped aperture grille (page 14). This aperture grille allows more light to pass through to the screen giving the Trinitron CRT more color and brightness.

• When the power is turned on, the auto-degauss cycle is activated. While the autodegauss cycle is activated, a hum may be heard. The same hum is heard when the monitor is manually degaussed. This is not a malfunction.

— 9 —

6556-03N/43N/03S/43S

SECTION 2

DISASSEMBLY

2-1. CABINET REMOVAL

Cabinet

Four screws

(BVTP 4 x 16)

2-3. SERVICE POSITION

Four screw covers

2-2. EMI SHIELD REMOVAL

EMI Shield

Six screws

(BVTP 3 x 12)

2-4. D and A BOARD REMOVAL

A board

D board

Five screws

(BVTP 3 x 12)

One screw

(BVTT 4 x 8)

Cable stopper

Two screws

(BVTP 3 x 12)

— 10 —

Cable bracket

D board

2-5. PICTURE TUBE REMOVAL

Demagnetization coil

Tension spring

A board

Neck assy

Deflection yoke

Four screws

(Tapping screw 5)

Picture tube shield

Two screws

Stand assy

(D board)

6556-03N/43N/03S/43S

(BVTP 4 x 16)

Anode cap

Cushion

REMOVAL OF THE ANODE-CAP

NOTE: 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

Turn up one side of the rubber cap in

the direction indicated by arrow .

Use your thumb to pull the rubber cap

firmly in the direction indicated by arrow .

HOW TO HANDLE AN ANODE-CAP

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

of the anode-cap.

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.

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

shatter-hook terminal to protrude and damage the rubber.

When one side of the rubber cap sepa-

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

— 11 —

6556-03N/43N/03S/43S

SECTION 3

SAFETY RELATED 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.

D - BOARD

Part Replaced ([)

Part Replaced (])

RV501, T501, R545, R546, R548, R550, R547, R549, R552, D517, IC605, IC901, C540, C542, C544, C541, C535, IC501, C558, R567, R564, C555, C553, C554, C561

Allow the unit to warm up for one minute prior to

checking the following conditions:

RV501

a) HV Regulator Check

1) Input white cross hatch signal. (fH = 64 kHz)

2) Minimum CONT and BRT controls.

3) Cut off Screen VR (G2).

4) Input voltage: 120 + 2 VAC

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

Standard voltage: 25.0KV + 0.5KV

6) When replacing components identified by ], make sure to recheck the High Voltage.

7) Verify the High Voltage as shown above (25.0KV + 0.5KV) is within specification. If not, set H. SIZE data at minimum (-127) and then adjust RV501 on "D" Board.

8) After adjusting the High Voltage within specification, put the RV cover on RV501 as shown below and apply sufficient amount of RTV around RV501.

b) HV Hold-Down Check

1) Using an external DC Power supply, apply the voltage shown below between cathode of D517 on " D" Board and GND, and confirm that the HV Hold-Down circuit works. (Raster disappears)

Apply DC Voltage: 31.4 + 0.01 VDC

Check Condition

• Input voltage : 120 + 2 VAC

• Input signal : (fH = 64 kHz), White Cross Hatch

• Controls : CONT (max) & BRT (center)

• B+ Voltage : 185 + 3.0 VDC

c) Beam Protector Check (Software logic)

1) Using an external DC power supply, apply the voltage 8.8 + 0.01 VDC between pin 11 of FBT (T501) and GND, and confirm that the voltage across C541 is 3.7 VDC or less.

Check Condition

• Input voltage : 120 + 2 VAC

• Input signal : (fH = 64 kHz), White Cross Hatch

• Controls : CONT (max) & BRT (center)

d) B+ MAX. Check

1) Input white cross hatch (fH = 64 kHz) signal.

2) CONT (max) & BRT (center)

3) Input voltage: 120 + 2 VAC Note: Use NF power s u p ply or m ake sure that distortion factor is 3% or less.

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

Standard voltage: 185 + 3.0 VDC

104

RV501

— 12 —

+ 26 hidden pages

IBM 6556, 03N, 43N, 03S, 43S Service Manual

TABLE OF CONTENTS

DISASSEMBLY