Panasonic WVCK1420 - COLOR MONITOR 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
C1999 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 uis 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 ois 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 iis 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
8The following equipments are required for adjustment of
WV-CK1420 and WV-CK2020 Colour Video Monitors.
8Oscilloscope
8Digital Voltmeter
8TV Signal Generator
8Degaussing Coil
8Tamper Proof Screwdriver
2. Disassembling Procedure for the
Adjustment
■WV-CK1420
8Referring to Fig. 2-1, remove one screw that secure the
Cord Holder and remove the Cord Holder.
Fig. 2-1
8Referring 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
8Referring to Fig. 2-3, remove one screw that secure the
Cord Holder and remove the Cord Holder.
Fig. 2-3
8Referring 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
8The 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 –
8Short 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.
8Return to the Normal Mode from the FACTORY Mode by
pressing the MENU Button and AUDIO CONTROL (–)
Button simultaneously.
8Enter 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.
8Return to the FACTORY Mode from the SERVICE Mode
by pressing the MENU Button and AUDIO CONTROL (+)
Button simultaneously.
8Return to the Normal Mode from the SERVICE Mode by
pressing the MENU Button and AUDIO CONTROL (–)
Button simultaneously.
8In 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.
8In 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.
8The Bright, Sub Bright, Contrast, Sub Contrast, Picture,
Sub Picture, Colour and Sub Colour Adjustments will be
done in this mode.
8To enter the CHK2 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.
8To enter the H1 LINE Mode by shorting the FA3 and
ground.
8The R-Cutoff, G-Cutoff, B-Cutoff, Bright, Sub Bright, R-
Drive and B-Drive Adjustments will be done in this mode.
8To enter the CHK3 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.
8The HC, VH and VC Adjustments will be done in this
mode.
8To enter the CHK4 Mode by pressing the MENU Button
and the Adjustment Items will be displayed on the Screen.
8The AV Colour, Noise Mute, Tone, Trap, Demo, OSD
Adjustments will be done in this mode.
8Return to the first menu of the SERVICE Mode by
pressing the MENU Button.
4. Connection And Setting Up
4.1. Connection
8The Fig. 4-1 shows the connection diagram for the
adjustment procedure.
Fig. 4-1
8Connect the coaxial cable between Video Input Connector
of the Colour Monitor and Video Output Connector of TV
Signal Generator.
4.2. Setting Up
8Turn ON the Power Switch.
8Press the MENU Button, the setup Menu will be displayed
as shown in Fig. 4-2.
Fig. 4-2
8Select 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
8Move 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
8Refer 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
8Turn OFF the Power Switch.
8Supply the Colour Bar signal to the Video Input
Connector.
8Short between Anode of D504 and ground by jumper wire
to stop the ABL.
8Turn ON the Power Switch.
8Set the Service Mode and select the "CHK 1" mode.
8Select the BRIGHT Item.
8Set the BRIGHT Item to the minimum position (0).
8Select the CONTRAST Item.
8Set the CONTRAST Item to the maximum position (63).
8Connect the Oscilloscope to the pin 3 of Connector A11
on the Main Board.
8Adjust SUB BRIGHT so that the signal between Black and
White at the pin 3 of A11 does not saturate.
8Adjust SUB CONTRAST so that the signal between Black
and White at the pin 3 of A11 becomes 3.1 ± 0.1 V.
8Remove 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
8Supply the Colour Bar signal to the Video Input
Connector.
8Set the Service Mode and select the "CHK 1" mode.
8Select the BRIGHT Item.
8Set the BRIGHT Item to the minimum position (0).
8Select the CONTRAST Item.
8Set the CONTRAST Item to the center position (32).
8Select the PICTURE Item.
8Set the PICTURE Item to the minimum position (0).
8Select the COLOUR Item.
8Set the COLOUR Item to the enter position (32).
8Connect the Oscilloscope to the Collector of Q353 for WV-
CK1420 or Collector of Q354 for WV-CK2020 on the CRT
Socket Board.
8Adjust 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
8This adjustment should be done after aging for more than
30 minutes.
8Degauss the CRT using a Degaussing Coil.
8Supply the Cross-Hatch signal to the video Input
Connector.
8Loosen both Deflection Coil Fixing Screw and Magnet
Holding Screw.
8Adjust the Convergence roughly by the Convergence
Magnet and Deflection Coil.
8Move Deflection Coil to the rear direction (CRT Socket
Board side).
8Supply the Red Colour signal to the video Input
Connector.
8Adjust the Purity Magnet so that the Red area comes to
the center on the CRT Screen as shown in Fig. 5-2.
8Rotate 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
8Move the deflection coil forward until red colour fully
occupies the entire screen and tighten the deflection coil
fixing screw.
χVp-p
NO GOOD GOOD
RED RED

– 7 –
8The magnets holding screw will be fastened after
completing next step.
(4). Convergence Adjustment
Adjusts : Convergence Magnet-1
Convergence Magnet-2
Observe : Colour Monitor
8Supply the Dot signal to the Video Input Connector.
8Adjust the PICTURE and BRIGHT so that much easy to
see the picture on the Screen.
8Adjust the Convergence Magnet-1 as shown in Fig. 5-3 so
that red and blue dots on the center area of the CRT
Screen is overlapped.
8Adjust the Convergence Magnet-2 as shown in Fig. 5-3 so
that the green and magenta (Red + Blue) dots on the
center area of the CRT Screen is overlapped (dots
becomes White).
Fig. 5-3
8Change the signal from Dot signal to Cross-Hatch signal.
8If a discrepancy appears at the corner area, slightly adjust
the Convergence Magnets 1 and 2.
8Repeat above adjustment (Convergence Magnets 1 and
2) until no discrepancy appears on the entire screen.
8Tighten the Magnets Holding Screw.
(5). White Balance Adjustment
Test Point : Pin 3 of A11 (G) Main Board
KG (Cathode of Green) CRT Socket Board
Adjust : SCREEN Control
Flyback Transformer on the Main Board
LEVEL CONTROL (+) Main Board
LEVEL CONTROL (–) Main Board
Observe : Colour Monitor
8Supply the Monoscope signal to the Video Input
Connector.
8Set the Service Mode and select the "CHK 1" mode.
8Select the BRIGHT Item.
8Set the BRIGHT Item to the center position (32).
8Select the CONTRAST Item.
8Set the CONTRAST Item to the maximum position (63).
8Select the PICTURE Item.
8Set the PICTURE Item to the center position (32).
8Select the COLOUR Item.
8Set the COLOUR Item to the center position (32).
8Select the "CHK 2" Mode.
8Select SUB BRIGHT Item.
8Set the R-CUTOFF to (0), G-CUTOFF to (125) and B-
CUTOFF to (0).
8Set the R-DRIVE to (40) and B-DRIVE to (40).
8Short between FA3 and ground by jumper wire.
8Set the SCREEN Control of the Flyback Transformer to
fully counterclockwise direction.
8Connect the Oscilloscope to the pin 3 of Connector A11
on the Main Board.
8Adjust the SUB BRIGHT so that the voltage at the pin 3 of
A11 becomes 2.2 ± 0.05 V DC as shown in Fig. 5-4.
Fig. 5-4
8Remove the jumper wire from FA3 and ground.
8Set the SCREEN Control to clockwise direction for
illuminating the Screen.
8Select the G-CUTOFF mode, short between FA3 and
ground by jumper wire.
8Set the SCREEN Control to fully counterclockwise
direction again.
8Connect the Oscilloscope to the Cathode of the Green on
the CRT Socket Board.
8Adjust the SUB BRIGHT so that the voltage at the
Cathode of the Green becomes 140 ± 2 V DC for WV-
CK1420, 160 ± 2 V DC for WV-CK2020 as shown in Fig.
5-5.
Deflection
Coil
Deflection Coil Fixing Screw
Purity Magnet for WV-CK1420
(Convergence Magnet-1 for WV-CK2020)
Convergence Magnet-1 for WV-CK1420
(Convergence Magnet-2 for WV-CK2020)
Convergence Magnet-2 for WV-CK1420
(Purity Magnet for WV-CK2020)
Magnet Holding Screw
2.2 ± 0.05 V
GND
Adjust center of scanning periode.

– 8 –
Fig. 5-5
8Turn the SCREEN Control slowly, and fix the green
becomes just illuminated point.
8Adjust the other two low-lights so that the horizontal line
becomes white.
8Remove the jumper wire from FA3 and ground.
8Adjust the R-DRIVE and B-DRIVE so that the most
highest portion becomes White.
(6). HC, VC and VH Adjustment
Adjust : LEVEL CONTROL (+) Main Board
LEVEL CONTROL (–) Main Board
Observe : Colour Monitor
8Set the "CHK 3" Mode.
8Supply the Monoscope signal to the Video Input
Connector.
8Select the HC Item.
8Adjust the HC Data so that the Horizontal Position
becomes center.
8Select the VC Item.
8Adjust the VC Data so that the Vertical Position becomes
center.
8Select the VH Item.
8Adjust the VH Data so that the full Vertical Height
becomes plus 8 % overscanning.
(7). Sub Bright Adjustment
Adjust : LEVEL CONTROL (+) Main Board
LEVEL CONTROL (–) Main Board
Observe : Colour Monitor
8Turn ON the Power Switch.
8Set the "CHK 1"Mode.
8Select the BRIGHT Item.
8Set the BRIGHT Item to the center position (32).
8Select the CONTRAST Item.
8Set the CONTRAST Item to the center position (32).
8Select the PICTURE Item.
8Set the PICTURE Item to the center position (32).
8Supply the Black Level Pattern signal to the Video Input
Connector.
Adjust center of scanning periode.
140 ± 2 V for WV-CK1420
160
± 2 V for WV-CK2020
GND
8Adjust SUB BRIGHT Data so that the second portion
becomes slightly lit as shown in Fig. 5-6.
Fig. 5-6
(8). Focus Adjustment
Adjust : FOCUS Control
Flyback Transformer on the Main Board
Observe : Colour Monitor
8Supply the Dot signal or Cross-Hatch signal to the Video
Input Connector.
8Adjust the FOCUS Control on the Flyback Transformer to
best focal point.
Adjust the Sub-Bright so that the second
portion becomes slightly lit.