Panasonic WV-CK2020 User Manual

SPECIFICATIONS

WV-CK1420

Power Source : 220 - 240V AC, 50Hz
Power Consumption : Approx. 66W
Screen Size : 371.8mm diagonal tube screen size, 90° deflection

335.4mm diagonal actual visual size

Horizontal Resolution : 330TV lines at centre
Video Input : 1.0V[p-p] composite/75Ω, BNC with Auto Termination
Audio Input : –8dB/Hi-z, RCA standard jack
Speaker Output : 0.7W
Sweep Linearity : Horizontal: Less than 5%

Vertical: Less than 5%

Sweep Geometry : Less than 2%
Ambient Operating Humidity : Less than 90%
Ambient Operating Temperature : –10°C - +50°C (14°F - 122°F)
Dimensions : 366(W) x 346(H) x 365(D)mm [14-7/16”(W) x 13-10/16”(H) x 14-6/16”(D)]
Weight : 9.6kg (21.2lbs.)

WV-CK2020

Power Source : 220 - 240V AC, 50Hz
Power Consumption : Approx. 80W
Screen Size : 548mm diagonal tube screen size, 90° deflection

508mm diagonal actual visual size

Horizontal Resolution : 500TV lines at centre
Video Input : 1.0V[p-p] composite/75Ω, BNC with Auto Termination

WV-CK1420/WV-CK2020

ORDER NO. AVS9911206C8

C 1999 Matsushita Communication Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

Colour Monitor

WV-CK1420 WV-CK2020

This service information is designed for experienced repair technicians only and is not designed for use by the
general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to
service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any
attempt to service or repair the product or products dealt with in this service information by anyone else could
result in serious injury or death.

Y

WARNING

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK). NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.

This symbol warns the user that uninsulated voltage within
the unit may have sufficient magnitude to cause electric
shock. Therefore, it is dangerous to make any kind of contact
with any inside part of this unit.

This symbol alerts the user that important literature concerning
the operation and maintenance of this has been included.
Therefore, it should be read carefully in order to avoid
any problems.

There are special components used in this equipment which are important for safety. These parts are indicated

by the ” ” mark on the schematic diagram and the replacement parts list. It is essential that these critical
parts should be replaced with manufacturer's specified parts to prevent X-radiation, shock, fire, or other hazards.
Do not modify the original design without permission of manufacture.

IMPORTANT SAFETY NOTICE

Audio Input : –8dB/Hi-z, RCA standard jack
Speaker Output : 0.7W
Sweep Linearity : Horizontal: Less than 5%

Vertical: Less than 5%

Sweep Geometry : Less than 2%
Ambient Operating Humidity : Less than 90%
Ambient Operating Temperature : –10°C - +50°C (14°F - 122°F)
Dimensions : 509(W) x 467(H) x 480(D)mm [20-1/16”(W) x 18-6/16”(H) x 18-14/16”(D)]
Weight : 21kg (46.3lbs.)

Weights and dimensions shown are approximate.
Specifications are subject to change without notice.

CONTENTS

Major Operating Controls and Their Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Location of Test Points and Adjusting Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Conductor View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Exploded View

WV-CK1420 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
WV-CK2020 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

– 1 –

MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS

1. Power Switch (POWER, ON/OFF)

This is a push-push type switch which turns the power
of this monitor on and off.
Press once and the switch remains down (;) for
turning on the power of monitor.
Press again, the switch comes up (l ) for turning off
the power of the monitor.

2. Audio Control Buttons (–AUDIO+)

Press these buttons to increase or decrease the sound
volume level.

3. Menu Button (MENU)

Press to display the setup display or move the cursor
down one line in the setup display.

4. Level Control Button (–LEVEL+)

Press these buttons to adjust level of the selected item
in the setup display, or select a parameter in the setup
display.

5. Power Indicator

This indicator lights up (red) when the Monitor’s power
is turned on.

6. Audio Output Connector (AUDIO OUT)

The audio input signal connected to the audio input
connector u is looped through to this connector.

7. Audio Input Connector (AUDIO IN)

For input of audio signal from an outboard device.

8. Video Output Connector (VIDEO OUT)

The video input signal connected to the video input
connector o is looped through to this connector and
terminated automatically.

9. Video Input Connector (VIDEO IN)

For input of the PAL composite video signal from an
outboard device.

POWER

ON

OFF

–AUDIO+ MENU –LEVEL+

Color Monitor WV-CK1420

AUDIO VIDEO

OUT IN

OUT IN

■ WV-CK1420

– 2 –

■ WV-CK2020

1. Power Switch (POWER, ON/OFF)

This is a push-push type switch which turns the power
of this monitor on and off.
Press once and the switch remains down (;) for
turning on the power of monitor.
Press again, the switch comes up (l) for turning off the
power of the monitor.

2. Audio Control Buttons (–AUDIO+)

Press these buttons to increase or decrease the sound
volume level.

3. Menu Button (MENU)

Press to display the setup display or move the cursor
down one line in the setup display.

4. Level Control Button (–LEVEL+)

Press these buttons to adjust level of the selected item
in the setup display, or select a parameter in the setup
display.

5. Power Indicator

This indicator lights up (red) when the Monitor’s power
is turned on.

6. Control Panel Cover

Press to open for access to the control buttons on the
Control Panel.

7. Audio Output Connector (AUDIO OUT)

The audio input signal connected to the audio input
connector i is looped through to this connector.

8. Audio Input Connector (AUDIO IN)

For input of audio signal from an outboard device.

9. Video Output Connector (VIDEO OUT)

The video input signal connected to the video input
connector !0 is looped through to this connector and
terminated automatically.

10. Video Input Connector (VIDEO IN)

For input of the PAL composite video signal from an
outboard device.

AUDIO VIDEO

OUT IN

OUT IN

Color Monitor WV-CK 2020

POWER

–AUDIO+ –LEVEL+MENU

ON

OFF

– 3 –

1. Test Equipment Required

8

The following equipments are required for adjustment of
WV-CK1420 and WV-CK2020 Colour Video Monitors.

8

Oscilloscope

8

Digital Voltmeter

8

TV Signal Generator

8

Degaussing Coil

8

Tamper Proof Screwdriver

2. Disassembling Procedure for the Adjustment

■ WV-CK1420

8

Referring to Fig. 2-1, remove one screw that secure the
Cord Holder and remove the Cord Holder.

Fig. 2-1

8

Referring to Fig. 2-2, remove six screws that secure the
Rear Cover and remove the Rear Cover.

Fig. 2-2

ADJUSTMENT PROCEDURE

Remove one screw.Cord Holder

■ WV-CK2020

8

Referring to Fig. 2-3, remove one screw that secure the
Cord Holder and remove the Cord Holder.

Fig. 2-3

8

Referring to Fig. 2-4, remove six screws that secure the
Rear Cover and remove the Rear Cover.

Fig. 2-4

Remove six screws.

Rear Cover

Remove one screw.

Cord Holder

Remove six screws.

Rear Cover

– 4 –

3. Adjustment Flowchart

8

The Fig. 3-1 shows the Adjustment Flowchart.

Fig. 3-1

START

Normal Mode

Service

Yes

Normal

Service Mode (Normal Screen)

Pressing MENU and
Audio Control – Button
simultaneously.

Enter to Service Mode by pressing MENU
and Audio Control + Button simultaneously.
Enter to Factory Mode by pressing MENU
Button and Audio Control + Button
simultaneously again.

Pressing MENU and
Audio Control – Button
simultaneously

Enter to Factory Mode by shorting at once
between FA1 and ground, the Yellow "CHK"
Character will be appeared on the Screen.
Pressing Level Control + Button so that the
Screen changes to the White and changes
to the Transparency after aging.

Normal Mode

or

Service Mode

Return to Normal Mode

?

"CHK" Character has been
changed to the RED.

Pressing MENU Button

CHK 1 (RED)

Adjusting Item

CHK 1 Item : Sub Adjustment

Select : Audio Control + and – Buttons

Press the Audio Control + Button, adjustment mode has
been selected the BRIGHT, SUB BRIGHT, CONTRAST,
SUB CONTRAST, PICTURE, SUB PICTURE, COLOUR
and SUB COLOUR sequentially.

Adjust :Level Control + and – Buttons

Press Level Control + Button in this mode,
the colour of the Screen has been changed to
White, Blue, Green, Red and Transparency
sequentially.

CHK 2 Item : White Balance Adjustment

Select : Audio Control + and – Buttons

Press the Audio Control + Button, adjustment mode
has been selected the R-CUTOFF, G-CUTOFF,
B-CUTOFF, BRIGHT, SUB BRIGHT, R-DRIVE and

B-DRIVE sequentially.

Adjust :Level Control + and – Buttons

CHK 3 Item : Deflection Adjustment

Select : Audio Control + and – Buttons

Press the Audio Control + Button, adjustment mode
has been selected the HC, VH and VC sequentially.

Adjust :Level Control + and – Buttons

CHK 4 Item : Option Adjustment

Select : Audio Control + and – Buttons

Press the Audio Control + Button, adjustment mode
has been selected the AV COLOUR, NOISE MUTE,

TONE, TRAP, DEMO and OSD sequentially.

Adjust :Level Control + and – Buttons

Pressing MENU Button

CHK 2 (RED)

Adjusting Item

H1 LINE MODE

(R-Cutoff, G-Cutoff, B-Cutoff
and Sub Bright Adjustment)

Pressing MENU Button

CHK 3 (RED)

Adjusting Item

Pressing MENU Button

Pressing MENU Button

CHK 4 (RED)

Adjusting Item

Short between
FA3 and ground
(1.424 - 1.696 V)

Voltage
except
above

Service Mode

– 5 –

8

Short between FA1 and ground at once to set the
FACTORY Mode, the Yellow "CHK" Character will be
displayed on the Screen, and press the LEVEL
CONTROL (+) Button the Screen changes to the White.
The Screen changes to the Transparency after aging.

8

Return to the Normal Mode from the FACTORY Mode by
pressing the MENU Button and AUDIO CONTROL (–)
Button simultaneously.

8

Enter to the SERVICE Mode from the FACTORY Mode
by pressing the MENU Button and AUDIO CONTROL (+)
Button simultaneously, the "CHK" Character has been
changed to the Red.

8

Return to the FACTORY Mode from the SERVICE Mode
by pressing the MENU Button and AUDIO CONTROL (+)
Button simultaneously.

8

Return to the Normal Mode from the SERVICE Mode by
pressing the MENU Button and AUDIO CONTROL (–)
Button simultaneously.

8

In the SERVICE Mode (Normal Screen), the colour of the
Screen has been changed to White, Blue, Green, Red and
Transparency sequentially every pressing the LEVEL
CONTROL (+) Button.

8

In the SERVICE Mode (Normal Screen), to enter the
CHK1 Mode by pressing the MENU Button and the

Adjustment Items will be displayed on the Screen.

8

The Bright, Sub Bright, Contrast, Sub Contrast, Picture,
Sub Picture, Colour and Sub Colour Adjustments will be
done in this mode.

8

To enter the CHK2 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.

8

To enter the H1 LINE Mode by shorting the FA3 and
ground.

8

The R-Cutoff, G-Cutoff, B-Cutoff, Bright, Sub Bright, R­Drive and B-Drive Adjustments will be done in this mode.

8

To enter the CHK3 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.

8

The HC, VH and VC Adjustments will be done in this
mode.

8

To enter the CHK4 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.

8

The AV Colour, Noise Mute, Tone, Trap, Demo, OSD
Adjustments will be done in this mode.

8

Return to the first menu of the SERVICE Mode by
pressing the MENU Button.

4. Connection And Setting Up

4.1. Connection

8

The Fig. 4-1 shows the connection diagram for the
adjustment procedure.

Fig. 4-1

8

Connect the coaxial cable between Video Input Connector
of the Colour Monitor and Video Output Connector of TV
Signal Generator.

4.2. Setting Up

8

Turn ON the Power Switch.

8

Press the MENU Button, the setup Menu will be displayed
as shown in Fig. 4-2.

Fig. 4-2

8

Select the desired LANGUAGE by pressing the LEVEL
CONTROL (–) or (+) Buttons, pressing the Buttons will

toggle the Setup display in selected as shown in fig. 4-3.

Fig. 4-3

8

Move the cursor to the BRIGHT, CONTRAST, PICTURE,
COLOUR by pressing the MENU Button and set all values
to 32 (Center position) as an initial setting.

BRIGHT
CONTRAST
PICTURE
COLOUR
NORMAL SETTING
LANGUAGE

8888888888888

8888888888888

8888888888888

8888888888888

8888888888888

8888888888888

8888888888888

8888888888888

ENGLISH

ENGLISH FRENCH SPANISH

LEVEL CONTROL (+)
LEVEL CONTROL (–)

TV Signal Generator

Colour Monitor

– 6 –

5. Adjustment Procedure

8

Refer to the Location of the Test Points and Adjusting
Controls on page 9.

(1). Sub Contrast Adjustment

Test Point : Pin 3 of A11 (G) Main Board
Adjust : LEVEL CONTROL (+) Main Board

LEVEL CONTROL (–) Main Board

8

Turn OFF the Power Switch.

8

Supply the Colour Bar signal to the Video Input
Connector.

8

Short between Anode of D504 and ground by jumper wire
to stop the ABL.

8

Turn ON the Power Switch.

8

Set the Service Mode and select the "CHK 1" mode.

8

Select the BRIGHT Item.

8

Set the BRIGHT Item to the minimum position (0).

8

Select the CONTRAST Item.

8

Set the CONTRAST Item to the maximum position (63).

8

Connect the Oscilloscope to the pin 3 of Connector A11
on the Main Board.

8

Adjust SUB BRIGHT so that the signal between Black and
White at the pin 3 of A11 does not saturate.

8

Adjust SUB CONTRAST so that the signal between Black
and White at the pin 3 of A11 becomes 3.1 ± 0.1 V.

8

Remove jumper wire from Anode of D504 and ground.

(2). Colour Output Adjustment

Test Point : Q353-C (B) for WV-CK1420

CRT Socket Board

Q354-C (B) for WV-CK2020

CRT Socket Board

Adjust : LEVEL CONTROL (+) Main Board

LEVEL CONTROL (–) Main Board

8

Supply the Colour Bar signal to the Video Input
Connector.

8

Set the Service Mode and select the "CHK 1" mode.

8

Select the BRIGHT Item.

8

Set the BRIGHT Item to the minimum position (0).

8

Select the CONTRAST Item.

8

Set the CONTRAST Item to the center position (32).

8

Select the PICTURE Item.

8

Set the PICTURE Item to the minimum position (0).

8

Select the COLOUR Item.

8

Set the COLOUR Item to the enter position (32).

8

Connect the Oscilloscope to the Collector of Q353 for WV­CK1420 or Collector of Q354 for WV-CK2020 on the CRT
Socket Board.

8

Adjust SUB COLOUR so that the Colour Output signal
becomes 29 ± 1 Vp-p for WV-CK1420/B, 36 ± 1 Vp-p for
WV-CK1420/G, 32 ± 1 Vp-p for WV-CK2020/B and 38 ± 1
Vp-p for WV-CK2020/G as shown in Fig. 5-1.

Fig. 5-1

(3). Purity Adjustment

Adjust : Purity Magnet Deflection Coil
Observe : Colour Monitor

8

This adjustment should be done after aging for more than
30 minutes.

8

Degauss the CRT using a Degaussing Coil.

8

Supply the Cross-Hatch signal to the video Input
Connector.

8

Loosen both Deflection Coil Fixing Screw and Magnet
Holding Screw.

8

Adjust the Convergence roughly by the Convergence
Magnet and Deflection Coil.

8

Move Deflection Coil to the rear direction (CRT Socket
Board side).

8

Supply the Red Colour signal to the video Input
Connector.

8

Adjust the Purity Magnet so that the Red area comes to
the center on the CRT Screen as shown in Fig. 5-2.

8

Rotate the deflection coil to find the point where the red
colour whose center portion becomes equal on the CRT
Screen as shown in Fig 5-2.

Fig. 5-2

8

Move the deflection coil forward until red colour fully
occupies the entire screen and tighten the deflection coil
fixing screw.

χ

Vp-p

NO GOOD GOOD

RED RED