Samsung PN22N Series Service Manual

Manual

SERVICE

COLOR MONITOR CONTENTS

1. Precautions

2. Product Specifications

3. Disassembly & Reassembly

4. Alignment & Adjustments

5. Troubleshooting

6. Exploded View & Parts List

7. Electrical Parts List

8. Block Diagram

9. Wiring Diagram

10. Schematic Diagrams

COLOR MONITOR

PN22N*

Samsung Electronics Co., Ltd. October 2000.
Printed in Korea
P/N : BH68-00362A-01

Copyright

© 2000 by Samsung Electronics Co., Ltd.
All rights reserved.
This manual may not, in whole or in part, be

copied, photocopied, reproduced, translated, or
converted to any electronic or machine readable
form without prior written permission of
Samsung Electronics Co., Ltd.

PN22N* Service Manual
First edition October 2000.

Printed in Korea.

Trademarks

Samsung is a registered trademark and
PN22N* and MacMaster Cable Adapter are
trademarks of Samsung Electronics Co., Ltd.

Macintosh, Centris, Quadra, Duo Dock, and
Power Macintosh are trademarks of Apple
Computer, Inc.

All other trademarks are the property of their
respective owners.

ii PN22N*

WARNINGS

1. For continued safety, do not attempt to modify the
circuit board.

2. Disconnect the AC power before servicing.

3. When the chassis is operating, semiconductor
heatsinks are potential shock hazards.

1-1-1 Servicing the High Voltage VR

and CRT :

WARNING:A high voltage VR replaced in the wrong

direction may cause excessive X-ray
emissions.

Caution: When replacing the high voltage

adjustment VR, it must be fixed by a
soldering iron after it is properly set.

1. When servicing the high voltage system, remove
the static charge by connecting a 10 kohm resistor
in series with an insulated wire (such as a test
probe) between the chassis and the anode lead.

2. If the HV VR requires adjustment, (a) Replace the
VR and adjust the high voltage to the specification.
(b) Use a soldering iron to melt the adjustment cap
on the HV VR to prevent any movement.

3. When troubleshooting a monitor with excessively
HV, avoid being unnecessarily close to the monitor.
Do not operate the monitor for longer than is
necessary to locate the cause of excessive voltage.

4. High voltage should always be kept at the rated
value, no higher. Only when high voltage is
excessive are X-rays capable of penetrating the shell
of the CRT, including the lead in glass material.
Operation at high voltages may also cause failure of
the CRT or high voltage circuitry.

5. When the HV regulator is operating properly, there
is no possibility of an X-ray problem. Make sure the
HV does not exceed its specified value and that it is
regulating correctly.

6. The CRT is especially designed to prohibit
X-ray emissions. To ensure continued X-ray
protection, replace the CRT only with one that is
the same or equivalent type as the original.

7. Handle the CRT only when wearing shatterproof
goggles and after completely discharging the high
voltage anode.

8. Do not lift the CRT by the neck.

1-1-2 Fire and Shock Hazard :

Before returning the monitor to the user, perform the
following safety checks:

1. Inspect each lead dress to make certain that the
leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in
the monitor.

2. Inspect all protective devices such as nonmetallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.

3. Leakage Current Hot Check (Figure 1-1):

WARNING: Do not use an isolation transformer during

this test.

Use a leakage current tester or a metering system
that complies with American National Standards
Institute (ANSI C101.1, Leakage Current for

Appliances), and Underwriters Laboratories (UL
Publication UL1410, 59.7).

4. With the unit completely reassembled, plug the AC
line cord directly into a 120V AC outlet. With the
unit’s AC switch first in the ON position and then
OFF, measure the current between a known earth
ground (metal water pipe, conduit, etc.) and all
exposed metal parts, including: metal cabinets,
screwheads and control shafts. The current
measured should not exceed 0.5 milliamp. Reverse
the power-plug prongs in the AC outlet and repeat
the test.

Figure 1-1. Leakage Current Test Circuit

1-1-3 Product Safety Notices

Some electrical and mechanical parts have special
safety-related characteristics which are often not
evident from visual inspection. The protection they give
may not be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are identified by

on schematics and parts lists. A substitute
replacement that does not have the same safety
characteristics as the recommended replacement part
might create shock, fire and / or other hazards. Product
safety is under review continuously and new
instructions are issued whenever appropriate.

Components identified by on schematics and parts
lists must be sealed by a soldering iron after
replacement and adjustment.

1. Servicing precautions are printed on the cabinet,

PN22N* 1-1

1 Precautions

1-1 Safety Precautions

!

DEVICE
UNDER
TEST

TEST ALL

EXPOSED METAL

SURFACES

(READING SHOULD

NOT BE ABOVE 0.5mA)

LEAKAGE
CURRENT

TESTER

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)

EARTH

GROUND

and should be followed closely.

2. Always unplug the unit’s AC power cord from the
AC power source before attempting to: (a) remove
or reinstall any component or assembly, (b)
disconnect PCB plugs or connectors, (c) connect all
test components in parallel with an electrolytic
capacitor.

3. Some components are raised above the printed
circuit board for safety. An insulation tube or tape
is sometimes used. The internal wiring is
sometimes clamped to prevent contact with
thermally hot components. Reinstall all such
elements to their original position.

4. After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.

1. Immediately before handling any semiconductor

components or assemblies, drain the electrostatic
charge from your body by touching a known earth
ground. Alternatively, wear a discharging wrist­strap device. To avoid a shock hazard, be sure to
remove the wrist strap before applying power to
the monitor.

2. After removing an ESD-equipped assembly, place it
on a conductive surface such as aluminum foil to
prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESDs.

4. Use only a grounded-tip soldering iron to solder or
desolder ESDs.

5. Use only an anti-static solder removal device. Some
solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage
ESDs.

5. Check the insulation between the blades of the AC
plug and accessible conductive parts (examples:
metal panels, input terminals and earphone jacks).

6. Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the power
switch ON. Connect an insulation resistance meter
(500 V) to the blades of the AC plug.

The insulation resistance between each blade of the
AC plug and accessible conductive parts (see
above) should be greater than 1 megohm.

7. Never defeat any of the +B voltage interlocks. Do
not apply AC power to the unit (or any of its
assemblies) unless all solid-state heat sinks are
correctly installed.

8. Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting the
positive lead; always remove the instrument’s
ground lead last.

6. Do not remove a replacement ESD from its
protective package until you are ready to install it.
Most replacement ESDs are packaged with leads
that are electrically shorted together by conductive
foam, aluminum foil or other conductive materials.

7. Immediately before removing the protective
material from the leads of a replacement ESD,
touch the protective material to the chassis or
circuit assembly into which the device will be
installed.

Caution: Be sure no power is applied to the

chassis or circuit and observe all
other safety precautions.

8. Minimize body motions when handling
unpackaged replacement ESDs. Motions such as
brushing clothes together, or lifting your foot from
a carpeted floor can generate enough static
electricity to damage an ESD.

9. Indicates ESDs on the Schematic Diagram in
this manual.

1 Precautions

1-2 PN22N*

1-3 Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field­effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

1-2 Servicing Precautions

WARNING1: First read the “Safety Precautions” section of this manual. If unforeseen circumstances

create conflict between the servicing precautions and safety precautions, always
follow the safety precautions.

WARNING2: A high voltage VR replaced in the wrong direction may cause excessive X-ray

emissions.

WARNING3: An electrolytic capacitor installed with the wrong polarity might explode.

2 Product Specifications

2-1 Specifications

Picture Tube: 22-inch (50.0 cm) viewable, 0.24 mm Aperture Grille,

Full-square flat-face tube, 90˚ Deflection,

Anti-Reflection coating with Anti-electrastatic, Medium short persistence phosphor
Scanning Frequency Horizontal : 30 kHz to 121 kHz (Automatic), Vertical : 50 Hz to 185 Hz (Automatic)
Display Colors Unlimited colors
Maximum Resolution Horizontal : 2048 Dots

Vertical : 1536 Lines
Input Video Signal Analog, 0.7 Vp-p positive at 75 Ω, internally terminated
Input Sync Signal Separate Sync : TTL level positive/negative

Composite Sync : TTL level positive/negative

Sync-on-Green : Composite sync 0.3 Vp-p negative (Video on Vp-p positive)
Maximum Pixel Clock rate 340 MHz
Active Display Horizontal : 395 mm ± 3 mm (15.55” ± 0.12”) Vertical : 296 mm ± 3 mm (11.65” ± 0.12”)
Input Voltage AC 90 to 264 Volts, 60/ 50 Hz ± 3 Hz
Power Consumption (max) 160 Watt
Dimensions Unit ; 19.7 x 18.7 x 20.1 Inches (500 x 476 x 510 mm)

(W x D x H) Carton ; 25.0 x 24.6 x 25.3 Inches (634 x 625 x 642 mm)
Weight (Net/Gross) 69.4 lbs (31.5 kg) / 80.5 lbs (36.5 kg)
Environmental Considerations Operating Temperature : 32°F to 104°F (0°C to 40°C)

Humidity : 10 % to 80 %

Storage Temperature : -4°F to 113°F (-20°C to 45°C)

Humidity : 5 % to 95 %

• PN22N* complies with TCO 99 recommendations for reduced electromagnetic fields.

• Designs and specifications are subject to change without prior notice.

PN22N* 2-1

Item Description

2 Product Specifications

2-2 PN22N*

5

10

15

3 4

2

8

1211 13 14

716

Figure 2-1. Male Type Figure 2-2. Male Type

Sync
Type

Pin No.

Apple MacII

Separate

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

Red

Green

Blue
GND

DDC Return

GND-R
GND-G
GND-B

Reserved

GND-Sync./Self-raster

GND

DDC Data

H-Sync.
V-Sync.

DDC Clock

Red

Green

Blue
GND

DDC Return

GND-R
GND-G
GND-B

Reserved

GND-Sync./Self-raster

GND

DDC Data

H-Sync.

Not Used

DDC Clock

Red

Green +Sync.

Blue
GND

DDC Return

GND-R
GND-G
GND-B

Reserved

GND-Sync./Self-raster

GND

DDC Data

Not Used
Not Used

DDC Clock

GND-R

Red

H/V Sync.

Sense 0

Green

GND-G

Sense 1

Reserved

Blue

Sense 2

GND

V-Sync.

GND-B

GND

H-Sync.

2-2 Pin Assignments

15-Pin Side of the Signal Cable

Composite

Sync on Green

Cable Adapter

2 Product Specifications

PN22N* 2-3

QRS

P

O

Video

Sync

Sync

Horizontal

Vertical

CDE

P

O

B

A

Video

Sync

Sync

Separate Sync

A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width
C : Back porch D : Active time Q : Back porch R : Active time
E : Front porch S : Front porch

B

Green

Vertical

P

Q

R

S

O

Horizontal

Sync-on-Green

1152/75 Hz
1152 x 864

1600/85 Hz

1600 x 1200

800/85 Hz
800 x 600

VGA3/60Hz

640 x 480

VGA2/70Hz

720 x 400

Table 2-1. Timing Chart

fH (kHz)
A µsec
B µsec
C µsec
D µsec
E µsec
fV (Hz)
O msec
P msec
Q msec
R msec
S msec
Clock

Freq.
(MHz)

Polarity
H.Sync

V.Sync
Remark

31.469

31.778

3.813

1.907

25.422

0.636

70.087

14.268

0.064

1.080

12.711

0.413

28.322

Negative

Positive

Separate

31.469

31.778

3.813

1.907

25.422

0.636

59.940

16.683

0.064

1.048

15.253

0.318

25.175

Negative
Negative
Separate

53.674

18.631

1.138

2.702

14.222

0.569

85.061

11.756

0.056

0.503

11.179

0.019

56.250

Positive
Positive

Separate

106.250

9.412

0.837

1.325

6.972

0.279

85.000

11.765

0.028

0.433

11.294

0.009

229.50

Positive
Positive

Separate

Mode

IBM VESA

Timing

68.677

14.561

1.016

2.201

10.836

0.508

84.997

11.765

0.044

0.524

11.183

0.015

94.500

Positive
Positive

Separate

91.146

10.971

1.016

1.422

8.127

0.406

85.024

11.761

0.033

0.483

11.235

0.011

157.500

Positive
Positive

Separate

112.730

8.871

0.699

1.210

6.452

0.511

75.000

13.333

0.026

0.523

12.774

0.009

297.590

Negative

Positive

Separate

1024/85 Hz
1024 x 768

1920/75 Hz

1920 x 1024

1280/85 Hz

1280 x 1024

67.500

14.815

1.185

2.370

10.667

0.593

75.000

13.333

0.044

0.474

12.800

0.015

108.000

Positive
Positive

Separate

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.

3-1-1 Before making Disassembly

1. Disconnector signal cable and power cord
from the monitor.

2. With a pad beneath it, stand the monitor on its
front with the screen facing downward and
the base close to you.

3. Make sure nothing will damage the screen.

3-1-2 Cabinet Disassembly

1. With a pad beneath it, stand the monitor on its
front with the screen facing downward and
the base closest to you. Make sure nothing will
damage the screen.

2. Remove the Stand from the monitor.
(Refer to Stand manual)

3. Incline the monitor by lifting the rear of the
monitor.

4. Take out the screw caps on left/right top of
monitor.

5. Unscrew (4) and take the Rear Cover apart.

3-1-3 Removing the Top Shield

Remove the 9 screws on the top shield cover
and remove the shield.

3-1-4 Removing the Power PCB Assembly

and the Power PCB

1. Remove the 3 screws on the Power Assembly
shield.

2. Disconnect CN603, CN604, CN602, CN881 and
wire of clamp holder and then CN601 from
PCB Assembly shield.

3. Remove the 2 screws on the PCB Assembly
rear shield and remove the shield

4. Remove the 4 screws on the PCB Assembly.

PN22N* 3-1

3 Disassembly and Reassembly

This section of the service manual describes the disassembly and reassembly procedures for the
PN22N* monitors.

WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling

these components.

3-1 Disassembly

Cautions:1. Disconnect the monitor from the power source before disassembly.

2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.

Figure 3

Figure 2

Figure 1

3-1-5 Removing the BNC PCB Assembly and

the BNC PCB

1. Disconnect CN801, CN802, CN803, CN804,
CN202, CN204, CN205 on the BNC PCB
Assembly shield and remove the shield.

2. Remove the 2 screws from PCB Assembly
shield outside.

3. Remove the 2 cable ties, disconnect CN10 on
the small PCB Assembly.

4. Remove the 7 screws from PCB Assembly and
remove the PCB Assembly.

3-1-6 Removing the Video PCB Assembly

and the Video PCB

1. Disconnect 2 wires from BNC Assembly shield
and remove Video Assembly from the CRT
neck.

2. Disconnect 3 wires from Main PCB Assembly
and wires of clamp holder.

3. Desolder the 4 points on the video rear shield
and remove the shield.

4. Remove the 3 screws on the Video Assembly
shield inside and remove the shield from
Video PCB.

3-1-7 Removing the Main PCB Assembly

and the Main PCB

1. Remove chassis ground wire on the lift side.

2. Remove the 4 screws on the Bottom shield.

3. Disconnect CN901, CNS211, CNS201, H_DY,
V_DY and anode cap on the Main PCB
Assembly.

4. Remove 5 screws on the Main PCB.

3-1-8 Removing the Bracket

Remove the 10 screws on the Front Cabinet.

3 Disassembly and Reassembly

3-2 PN22N*

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.

4-1-1 Before Making Adjustments

4-1-1 (a) ORIENTATION

When servicing, always face the monitor to the
east.

4-1-1 (b) MAGNETIC FIELDS

Whenever possible, use magnetic field isolation
equipment such as a Helmholtz field to surround
the monitor. If a Helmholtz field is not available,
frequently degauss the unit under test.

Caution: Other electrical equipment may cause

external magnetic fields which may
interfere with monitor performance.

Use an external degaussing coil to limit magnetic
build up on the monitor. If an external degaussing
coil is not available, use the internal degaussing
circuit. However, do not use the internal
degaussing circuit more than once per 30 minutes.

4-1-1 (c) WARM-UP TIME

The monitor must be on for 30 minutes before
starting alignment. Warm-up time is especially
critical in color temperature and white balance
adjustments.

4-1-1 (d) SIGNAL

Analog, 0.7 Vp-p positive at 75 ohm, internal
termination
Sync: Separate/Composite
(TTL level negative/positive)

Sync-on-Green:
Composite sync 0.3 Vp-p negative
(Video 0.7 Vp-p positive)

4-1-1 (e) SCANNING FREQUENCY

Horizontal: 30 kHz to 121 kHz (Automatic)
Vertical: 50 Hz to 185 Hz (Automatic)

Unless otherwise specified, adjust at the
1280 x 1024 mode (H: 91 kHz, V: 85 Hz) signals.

Refer to Table 2-1 on pages 2-2 and 2-3.

4-1-1 (f) HIGH VOLTAGE ADJUSTMENT

Signal: 1280 x 1024 mode (91 kHz/85 Hz)
Display image: Full white
Contrast: Maximum
Brightness: Maximum
Limit: 27.0 kV ± 0.5 kV

Measure the hight voltage level at the anode cap.
High voltage should be within the limit as above.
If the high voltage needs adjustment use the
Softjig.

4-1-1 (g) G2 (SCREEN) VOLTAGE ADJUSTMENT

Signal: 1280 x 1024 mode (91 kHz/85 Hz)
Display image: Full white
Contrast: Maximum
Brightness: Maximum

Adjust the Screen VR of the FBT so that the G2
(Screen) Voltage for Toshiba it is 700 V ± 10 V.

4-1-1 (h) CENTER RASTER

Adjust VR401 so that the back raster comes to the
center when you apply a signal of 91 kHz/85 Hz.

PN22N* 4-1

4 Alignment and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor. Direction
is given for adjustment using the monitor Interface Board Ver. 2.0 and software (Softjig).

4-1 Adjustment Conditions

Caution: Changes made without the Softjig are saved only to the user mode settings. As such, the

settings are not permanently stored and may be inadvertently deleted by the user.

PN22N*

MITSUBISHI

G2 700V

4-1-1 (i) BRIGHTNESS AND CONTRAST

Unless otherwise specified, adjust control
volumes:

Brightness: Maximum
Contrast: Maximum

4-1-2 Required Equipment

The following equipment may be necessary for
adjustment procedures:

4-1-2 (a) DISPLAY CONTROL ADJUSTMENT

1. Non-metallic (–) screwdriver: 1.5 mm
Non-metallic (–) screwdriver: 3 mm

2. Philips (+) screwdriver: 1.5 mm

3. Non-metallic hexkey: 2.5 mm

4. Digital Multimeter (DMM), or
Digital Voltmeter (DVM)

5. Signal generator, or
Computer with a video board that uses the
ET-4000 chipset (strongly recommended if
using Samsung DM 200 software) and that
displays: 1280 x 1024 @ 85 Hz, or 1600 x 1200
@ 85 Hz (maximum).

6. Personal computer

7. Required software: Softjig.exe from Samsung
which includes the PN22NF.mdl
(Toshiba CRT) data file
Samsung DM200, or DisplayMate for
Windows from Sonera Technologies

8. Interface Board Ver. 2.0 Code No.
BH81-90001K

9. Parallel communications cable (25-pin to
25-pin); Code No. BH81-90001H

10. Signal cable (15-pin to 15-pin cable with
additional 3-pin connector); Code No.
BH81-90001J

11. 5 V DC adapter, not supplied

Note: Softjig Ass’y (includes items 8, 9 and 10)

Code No. BH81-90001L

4-1-2 (b) COLOR ADJUSTMENTS

1. All equipment listed in 4-1-2 (a), above

2. Color analyzer, or any luminance
measurement equipmen

4-1-3 Connecting the SoftJig

Connect the monitor to the signal generator and/
or PC as illustrated in Figures 4-1 and 4-2.

Note: The signal cable connector which includes

the 3-wire cable must connect to the
monitor. If you use Setup 2 (PC only, no
signal generator) you can only make
adjustments to the signal timing available
on that computer system. To make
corrections to all factory timings requires
the use of an additional signal generator.

4-1-4 After Making Adjustments

After finishing all adjustments, test the monitor in
all directions. If, for example, the monitor does not
meet adjustment specifications when facing north,
reposition the monitor to face east and readjust.
This time, try for an adjustment closer to the ideal
setting within the tolerance range. Test the unit
again in all directions. If the monitor again fails to
meet specifications in every direction, contact
your Regional After Service Center for possible
CRT replacement.

4 Alignment and Adjustments

4-2 PN22N*

MONITOR

INTERFACE
BOARD VER. 2.0

PC

SIGNAL
GENERATOR

3-WIRE
CABLE

SIGNAL CABLE

5V DC
ADAPTOR

PARALLEL CABLE

Figure 4-1. Setup 1, With Signal Generator

MONITOR

INTERFACE
BOARD VER. 2.0

PC

3-WIRE CABLE

SIGNAL CABLE

PARALLEL CABLE

D-SUB
CONNECTOR

5V DC
ADAPTOR

Figure 4-2. Setup 2, Without Signal Generator

4-2-1 Centering

Centering means to position the center point of
the display in the middle of the display area.
Horizontal size and position and vertical size and
position control the centering of the display.

Adjust the horizontal size and vertical size to their
optimal settings: 395 mm (H) x 296 mm (V).
1280 x 1024 mode (91 kHz/85Hz)

Adjust the horizontal position and vertical
position to ≤ 4.0 mm of the center point of the
screen.

|A-B| ≤ 4.0 mm. |C-D| ≤ 4.0 mm.

Figure 4-3. Centering

4-2-1 (a) HORIZONTAL SIZE ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to H_SIZE to
adjust the horizontal size of the display pattern to
390 mm. (Tolerance: ± 3 mm.)

4-2-1 (b) VERTICAL SIZE ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to V_SIZE to
adjust the vertical size of the display pattern to

292.5 mm. (Tolerance: ± 3 mm.)

4-2-1 (c) HORIZONTAL POSITION ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to H_POSI to
center the horizontal image on the raster.

4-2-1 (d) VERTICAL POSITION ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to V_POSI to
center the vertical image on the raster.

4-2-2 Linearity

Linearity affects the symmetry of images as they
appear on the screen. Unless each row or column
of blocks in a crosshatch pattern is of equal size,
or within the tolerances shown in Table 4-1, an
image appears distorted, elongated or squashed.

Horizontal Linearity = 2x x100

Vertical Linearity = 2x x100

Table 4-1.

4-2-2 (a) HORIZONTAL LINEARITY ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

To adjust the Horizontal Linearity, refer to Tables
4-1 and 4-2 for the tolerance range.

Click on the << or >> box next to H_LIN to
optimize the image.

4 Alignment and Adjustments

PN22N* 4-3

4-2 Display Control Adjustments

C

A

DISPLAY AREA

EDGE OF BEZEL

B

D

Preset mode

≤ 4% ≤ 10%

Adjust Linearity

Entire Linearity

Pre-load mode ≤ 5% ≤ 14%

X max-X min

X max+X min
Y max-Y min
Y max+Y min

4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

To adjust the Vertical Linearity, refer to Tables 4-1
and 4-2 for the tolerance range.

Click on the << or >> box next to V_LIN to
optimize the image.

4-2-3 Trapezoid Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to TRAP to make
the image area rectangular.

Figure 4-4. Trapezoid

4-2-4 Pinbalance Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to PIN_BAL to
optimize the image.

4-2-5 Parallelogram Adjustment

CONDITIONS

Scanning Frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to PARALL to
make the image are rectangular.

Figure 4-6. Parallelogram

4-2-6 Side Pincushion Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to BARREL to
straighten the sides of the image area.

4-2-7 Tilt Adjustment

CONDITIONS

Scanning Frequency: 91 kHz/85 Hz
Display image: Crosshatch pattern
Brightness: Cut-off
Contrast: Maximum

Click on the << or >> box next to ROTATE to
correct the tilt of the display.

4-2-8 Degauss

No adjustments are available for the degaussing
circuit. The degaussing circuit can effectively
function only once per 30 minutes.

4-2-9 To Delete the User Mode Data

To delete the adjustment data from the user
modes, Press the MENU Button for the
10 Seconds .

4-2-10 Save the Data

To save the adjustment data for a mode, press
FACTORY SAVE.

4 Alignment and Adjustments

4-4 PN22N*

| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.

Figure 4-7. Pincushion

A

5 mm

B

A

B

| D1 |, | D2 | ≤ 2.0 mm

Figure 4-5. Pinbalance

D1 D2 D1

C2

D2D1

C1

| A - B | < 5 mm

4-3-1 Color Coordinates (Temperature)

Color temperature is a measurement of the
radiant energy transmitted by a color. For
computer monitors, the color temperature refers
to the radiant energy transmitted by white. Color
coordinates are the X and Y coordinates on the
chromaticity diagram of wavelengths for the
visible spectrum.

CONDITIONS

Measurement instrument: Color analyzer
Scanning frequency: 91 kHz/85 Hz
Display Size : 395 (H) x 296 (V)
Display image: White flat field at

center of display area
Brightness: Cut-off
Contrast: Maximum

PROCEDURE

Use the directions in sections 4-3-2 through 4-3-4
to adjust the color coordinates for:
9300K to x = 0.283 ± 0.02, y = 0.298 ± 0.02
6500K to x = 0.313 ± 0.02, y = 0.329 ± 0.02
5000K to x = 0.346 ± 0.02, y = 0.359 ± 0.02

4-3-2 Color Adjustments for 9300K

4-3-2 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Back raster pattern
Brightness: Cut-off
Contrast: Maximum

1. Select COLOR CHANNEL 1 to control the

color for 9300K.

2. Adjust the luminance of the back raster to

between 0.3 to 1ft-L using the G_CUT
controls.

3. Click on the << or >> box next to B_CUT to

set the “y” coordinate to 0.298 ± 0.02.

4. Click on the << or >> box next to R_CUT to

set the “x” coordinate to 0.283 ± 0.02.
Note: If the above adjustments cannot be

done to each coordinate, click on the
<< or >> box next to G_CUT to decrease
or increase the green cutoff (bias) and
repeat procedures 2 and 3.

4-3-2 (b) G-GAIN ADJUSTMENT

Figure 4-8. Green Box Pattern

CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Green box pattern
Brightness: Cut-off
Contrast: Maximum

1. Click on the << or >> box next to G_GAIN to

adjust the brightness of the Green Gain to
25 ± 1 ft-L.

Note: If you can’t increase the Green Gain to

the appropriate value, click on the >>
box next to increase the ABL point.

4-3-2 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Full white pattern
Brightness: Cut-off
Contrast: Maximum

Figure 4-9. Full White Pattern

1. Click on the << or >> boxes next to R_GAIN
and B_GAIN to make the video white.
(For 9300K color adjustment:
x = 0.283 ± 0.02, y = 0.298 ± 0.02.)

Note: Do not touch the G_GAIN controls.

2. Check the ABL. If it is not within the
specifications (29 ± 1 ft-L), use the ABL
controls to adjust it.

3. Select COLOR FACTORY SAVE to save the
data.

4 Alignment and Adjustments

PN22N* 4-5

4-3 Color Adjustments

1/3H-1/2H

1/3V-1/2V

FRONT BEZEL OPENING
BACK RASTER

GREEN WINDOW

FRONT BEZEL OPENING
BACK RASTER

WHITE WINDOW

4-3-2 (d) WHITE BALANCE ADJUSTMENT VERIFICATION
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Back raster pattern
X-Y Coordinates: x = 0.283 ± 0.02,

y = 0.298 ± 0.02
Raster Luminance 0.3 ~ 1ft-L
ABL Luminance 29 ± 1 ft-L
Brightness: Cut-off
Contrast: Maximum

1. Check whether the color coordinates of the

back raster satisfy the above spec.
If they do not, return to 4-3-2 (a) and readjust

all settings.

2. Display a full white pattern.
Note: Do not touch the G_GAIN controls.

3. Adjust the Contrast Control on the monitor so

that the luminance of the video is about 5 ft-L.

4. Check whether the white coordinates of the

video meet the above coordinates spec.

5. Adjust the Contrast Control again so that the

luminance of the video is about 20 ft-L.

6. Check whether the white coordinates of the

video satisfies the above spec.
If they do not, return to 4-3-2 (a) and readjust

all settings.

4-3-3 Color Adjustments for 6500K

4-3-3 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Back raster pattern
Brightness: Cut-off
Contrast: Maximum

1. Select COLOR CHANNEL 2 to control the

color for 6500K.

2. Adjust the luminance of the back raster to

between 0.3 to 1.0 ft-L using the G_CUT
controls.

3. Click on the << or >> boxes next to R_CUT

and B_CUT to adjust the R-Bias to x = 0.313 ±

0.02 and the B-Bias to y = 0.329 ± 0.02.

4-3-3 (b) G-GAIN ADJUSTMENT

This procedure is the same as that for 9300K, refer
to the procedure on page 4-5.

4-3-3 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Full white pattern
Brightness: Cut-off
Contrast: Maximum

1. Click on the << or >> boxes next to R_GAIN
and B_GAIN to make the video white.
(For 6500K color adjustment:
x = 0.313 ± 0.02, y = 0.329 ± 0.02.)

2. Refer to the procedure for 9300K, section
4-3-2 (c) steps 2 and 3.

4-3-3 (d) WHITE BALANCE ADJUSTMENT VERIFICATION

Refer to the procedure for 9300K, section 4-3-2 (d).

4-3-4 Color Adjustments for 5000K

4-3-4 (a) BACK RASTER COLOR ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Back raster pattern
Brightness: Cut-off
Contrast: Maximum

1. Select COLOR CHANNEL 3 to control the
color for 5000K.

2. Adjust the luminance of the back raster to
between 0.3 to 1.0 ft-L using the G_CUT
controls.

3. Click on the << or >> boxes next to R_CUT
and B_CUT to adjust the R-Bias to x = 0.346 ±

0.02 and the B-Bias to y = 0.359 ± 0.02.

4-3-4 (b) G-GAIN ADJUSTMENT

This procedure is the same as that for 9300K, refer
to the procedure on page 4-5.

Adjust the brightness of the G_GAIN less 5 ft-L
than brightness of procedure for 9300K.

4-3-4 (c) WHITE BALANCE ADJUSTMENT
CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: Full white pattern
Brightness: Cut-off
Contrast: Maximum

1. Click on the << or >> boxes next to R_GAIN
and B_GAIN to make the video white.
(For 5000K color adjustment:
x = 0.346 ± 0.02, y = 0.359 ± 0.02.)

2. Refer to the procedure for 9300K, section
4-3-2 (c) steps 2 and 3.

4 Alignment and Adjustments

4-6 PN22N*

4-3-4 (d) WHITE BALANCE ADJUSTMENT VERIFICATION

Refer to the procedure for 9300K, section 4-3-2 (d).

4-3-5 Luminance Uniformity Check

Luminance is considered uniform only if the ratio
of lowest to highest brightness areas on the screen
is not less than 7.5:10.

CONDITIONS

Scanning frequency: 91 kHz/85 Hz

(1280 x 1024)
Display image: White flat field
Display size 395 (H) x 296 (V)
Brightness: Cut off point
Contrast: Maximum

PROCEDURE

Measure luminance at nine points on the display
screen (see figure below).

4-3-6 Focus Adjustment

CONDITIONS

Scanning frequency: 91 kHz/85 Hz
Display image: “H” character pattern
Brightness: Cut off point
Contrast: Maximum

PROCEDURE

1. Adjust the Focus VR on the FBT to display the

sharpest image possible.

2. Use Locktite to seal the Focus VR in position.

4-3-7 Color Purity Adjustment

Color purity is the absence of undesired color.
Conspicuous mislanding (unexpected color in a
uniform field) within the display area shall not be
visible at a distance of 50 cm from the CRT
surface.

CONDITIONS

Orientation: Monitor facing east
Scanning frequency: 91 kHz/85 Hz
Display image: Green flat field
Luminance: Cut off point at the center

of the display area

Note: Color purity adjustments should only be

attempted by qualified personnel.

PROCEDURE

For trained and experienced service technicians
only.

Use the following procedure to correct minor
color purity problems:

1. Make sure the display is not affected by
external magnetic fields.

2. Very carefully break the glue seal between the
2-pole purity convergence magnets (PCM), the
band and the spacer.

3. Make sure the spacing between the PCM
assembly and the CRT stem is 29 mm ± 1 mm.

4. Display a green pattern over the entire display
area.

5. Adjust the purity magnet rings on the PCM
assembly to display a pure green pattern.
(Optimum setting: x = 0.295 ± 0.015,
y = 0.594 ± 0.015)

6. Repeat steps 4 and 5 using a red pattern and
then again, using a blue pattern.

Table 4-2. Color Purity Tolerances

(For 9300K color adjustment: x = 0.283 ± 0.02, y = 0.298 ± 0.02)

7. When you have the PCMs properly adjusted,
carefully glue them together to prevent their
movement during shipping.

4 Alignment and Adjustments

PN22N* 4-7

Red: x = 0.620 ± 0.015 y = 0.334 ± 0.015
Green: x = 0.289 ± 0.015 y = 0.595 ± 0.015
Blue: x = 0.153 ± 0.015 y = 0.072 ± 0.015

Figure 4-10 Luminance Uniformity Check Locations

Memo

4 Alignment and Adjustments

4-8 PN22N*

PN22N* 5-1

5 Troubleshooting

5-1 Parts Level Troubleshooting

Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.

2. Check the following circuits.

• No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit.

• High voltage develops but no raster appears: Video output circuits.

• High voltage does not develop: Horizontal output circuits.

5-1-1 No Power Supply

Check and replace FH601, D601,

Q601, Q604, and IC611.

Done.

Repeating start?

Done.

No

Yes

IC611 Drain waveform is right?

Check and replace IC611.

Yes

No

Q601 Drain waveform is right?

Check IC601 and D602.

Yes

No

Q604 Drain waveform is right?

Check IC602 and IC603.

Yes

No

WAVEFORMS

5

2

Q601 Drain

CH1 RMS = 226.0V

4

Q604 Drain

CH1 RMS =434.4V

5

IC611 Drain

CH1 RMS = 333.2V

2

4

5 Troubleshooting

5-2 PN22N*

5-1-2 DPMS Failure

Check signal source

H/V sync video level.

Make No H/V sync (power off mode)

LED toggle green color, blinks?

Check IC201 Pin 30 and 31.

Yes

No

IC201 Pin9 High?

Check IC201 Pin 9.

Yes

No

Heater voltage is off?

Check IC201 Pin 10.

Yes

No

Done

5 Troubleshooting

PN22N* 5-3

5-1-3 H_Deflection Failure

Q403 Drain waveform is right?

Check R403, D416 and +210 V line.

Yes

No

Q404 Gate

waveforms are right?

Check Q404 and R415.

Check +80 V line.

Yes

No

Q405 collector

waveforms are right?

Check and replace D410 and Q405.

Check DY connector connection.

Yes

No

Check some parts around

QS202 and QS203.

ICS202 Pin 26

waveform is right?

Check some parts around ICS202.

Yes

No

WAVEFORMS

20

21

23

14

14

ICS 202 #26

CH1 RMS = 8.88 V

21

Q404 Gate

CH1 RMS = 7.67 V

23

Q405 Collector

CH1 RMS =353.2 V

20

Q403 Drain

CH1 RMS = 188.4 V

5 Troubleshooting

5-4 PN22N*

5-1-4 S_Correction Failure

S1~S6 signals are right at each

frequency block?

Check S1 ~ S6 signal.

Check and replace C451~ C457,

Q451~Q455, and Q456~Q460 .

Yes

5-1-5 H_Lin. Failure

ICS201 Pin 22 voltage varies with

different H_Lin. DAC values?

IC403 Pin 7 and 8 voltage varies

with different H_Lin. DAC values?

Check +12 V line.

Check some parts around IC403.

Check L403.

Yes

Yes

No

Check and replace ICS201.

No

Replace ICS201.

No

5-1-6 Invariable H_Size

ICS201 Pin 20 voltage varies with

different H_Size DAC values?

Check and replace ICS201.

No

5 Troubleshooting

PN22N* 5-5

5-1-7 Abnormal H_Size

T402 Pin 10 waveform is right?

Check and replace T402.

Check some parts

around ICS201 Pin 20

Yes

No

5-1-8 Side Pin or Trap Failure

ICS202 Pin 24 output exists?

Check and replace ICS202.

5-1-9 Para. or Pin Balance Failure

ICS202 Pin 24 output varies with

different DAC values?

No

Replace ICS202.

No

WAVEFORMS

19

19

T402 #10

CH1 RMS = 11.52 V

5 Troubleshooting

5-6 PN22N*

5-1-10 Tilt Failure

IC201 Pin 21 output duty varies

with different DAC values?

IC801 Pin 7 and 9 output varies

with different DAC values?

Check and replace IC801.

Check and replace Tilt coil.

Yes

Yes

No

Check and replace IC201.

No

Check tilt connector connection

5-1-11 V Deflection Failure

±13 V line is on?

ICS202 Pin 23 output exists?

Check and replace ICS202.

Yes

Yes

No

Check and replace D616 and D618.

No

IC301 Pin 1 input exists?

Check R300 and R304.

Yes

No

IC301 Pin 6 output exists?

Check and replace some parts

around IC301.

Yes

No

Check V DY connector connection.

16

25

16

ICS202 #23

CH1 RMS =3.668 V

25

IC301 #6

CH1 RMS = 8.72 V

5 Troubleshooting

PN22N* 5-7

5-1-12 V Size or Pos. Variation Failure

ICS202 Pin 23 output varies with

different DAC values?

Yes

Check some parts around ICS202.

Check bias voltage.

IC301 Pin 6 output varies with

different DAC values?.

No

5-1-13 High Voltage Failure

Q524 Drain driving pulse exist?

Check +12 V line.

Check and replace Q522, Q523,

Q524, and IC501.

Yes

No

Done

16

29

29

Q524 Drain

CH1 RMS = 207.2 V

Check and replace some parts

around IC301 check bias voltage.

No

Done

Yes

16

ICS202 #23

CH1 RMS =3.668 V

5 Troubleshooting

5-8 PN22N*

IC102 Pin 15 input exists and

varies with different patterns?

Check and replace

QS204 and QS205.

Input full white pattern to monitor.

Yes

No

T501 Pin 8 output exists?

Check and replace T501.

Yes

No

IC102 Pin 15 intput exists and

varies with different patterns?

Check and replace IC102.

Yes

No

Done

5-1-14 ABL Failure

5-1-15 Dynamic Focus Failure

IC503 Pin 3 and CN950 Pin 11

output are right?

Check and replace ICS202 and IC950.

Yes

No

Some parts around Q551,

Q552, Q553, Q554, and

IC503 are right?

Replace failed part.

Yes

No

Some parts around T502 are right?

Replace failed part.

Check the connection between FBT

Pin 13 and CRT Socket PCB.

Yes

No

31

WAVEFORMS

31

IC503 #3

CH1 RMS = 1.770V

Check CN204.

Yes

5 Troubleshooting

PN22N* 5-9

5-1-16 No Video

IC101 Pin 1, 3 and 5

inputs are right?

IC101 Pin 17, 21 and 23

outputs are right?

Check I2C bus and +12 V line.

Yes

Yes

No

Check D_SUB and BNC.

No

IC102 Pin 2, 6 and 11

outputs are right?

Check +12 V line.

Check and replace IC102.

Yes

No

Cathode DC levels are right?

Check +80 V line.

Check and replace IC150.

Yes

No

G2 voltage is right?

Check G2 wire,

CRT Socket board and FBT.

Change CRT.

Yes

Done.

No

Check signal cable and connection.

34

46

37

34

IC101 #1, 3, 5

CH1 RMS =3.475V

37

IC101 #17, 21, 23

CH1 RMS = 1.969 V

46

IC102, #2, 6, 11

CH1 RMS = 2.896 V

WAVEFORMS

5 Troubleshooting

5-10 PN22N*

5-1-17 Micom Failure

+5VS line is right?

IC101 Pin 15 and 16

inputs are right?

Check X201, C204 and C205.

Yes

Yes

No

Check ICS204.

No

IC201 Pin 18 input is right?

Check IC202.

Yes

No

All in/output values are right?

Replace IC201.

Yes

No

Done

38

WAVEFORMS

38

IC101 #16

CH1 RMS = 1.644V

39

5-1-18 Sub-Micom Failure

+5VS line is right?

ICS201 Pin 14 is right?

Check X201, CS205 and CS206.

Yes

Yes

No

Check ICS204.

No

All in/optput values are right?

Replace ICS201.

No

Yes

Done

10

WAVEFORMS

10

ICS201, #14

CH1 RMS = 2.904 V

39

IC101 #15

CH1 RMS = 1.94mV

5 Troubleshooting

PN22N* 5-11

5-1-19 OSD Failure

C312(–) input is right?

T402 Pin 10 input is right?

Check and replace Q101.

Yes

Yes

No

Check and replace D301 and Q301.

No

IC103 Pin 7 and 8

inputs are right?

Check IC201 Pin 41 and 42

ICS201 Pin 16 and 17.

Yes

No

IC103 Pin 20, 21 and 22 outputs

are right?

Check and replace IC103.

No

Check and replace IC101.

Yes

Done

Check CN204 and connector Ass’y.

24

24

C312(-)

CH1 RMS = 4.28V

19

48 49

WAVEFORMS

19

T402 #10

CH1 RMS = 11.52V

49

IC102 #21 (=IC103 #8)

CH1 RMS =4.064V

48

IC102 #20 (=IC103 #7)

CH1 RMS = 3.664 V

5 Troubleshooting

5-12 PN22N*

IC201 Pin 40 output is right?

Check and replace IC201.

Check user function key.

Yes

No

Q630 base input is right?

Check +13V_3 line

and replace Q630.

Done

Yes

No

Check degaussing connector.

5-1-21 Degaussing Failure

5-1-20 User Control Failure

IC201 Pin 35 and 36 inputs are

right at each function?

Check and replace function key.

Check and replace IC201.

Done

Yes

No

Check connector Ass’y.

Yes

RL601 operation is right?

Check D-coil and TH602.

No