Panasonic WV-CM1020 User manual

SPECIFICATIONS
Power Source : 220 - 240 V AC, 50 Hz
Power Consumption : Approx. 47 W
Screen Size : 250 mm (9-13/16”) diagonal tube screen size, 90˚ deflection
223 mm (8-3/4”) diagonal actual visual size
Horizontal Resolution : 300 TV lines at center
Video Input : 1.0 V[p-p] composite/75 Ω, BNC with Auto Termination
Audio Input : –8 dB/Hi-z, RCA standard jack
Speaker Output : 0.5 W
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 : 220(W) x 220 (H) x 309(D)mm [8-11/16”(W)x8-11/16”(H)x12-3/16”(D)]
Weight : 6.5 kg (14.3 lbs.)
Weights and dimensions shown are approximate.
Specifications are subject to change without notice.
OPTIONAL ACCESSORY
Rack Mount Bracket ......................................................... WV-Q52AE
WV-CM1020
ORDER NO. AVS0002229C8
ONA
B
OFF
POWERINPUT
MENU
–+
AUDIO
Video Monitor WV-CM
C2000 Matsushita Communication Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
Video Monitor

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 ”Y”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

CONTENTS
Major Operating Controls and Their Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location of Test Points and Adjusting Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Conductor View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

– 1 –
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS
ON A
B
OFF
POWER INPUT
MENU
–+
AUDIO Video Monitor WV-CM
FOCUS VIDEO B
IN
OUT
VIDEO A
IN AUDIO IN
OUT OUT
AC IN
q u oi !5!0!1!2!3 !4w r t ye
qPower Switch (POWER, ON/OFF)
This is a push-push type switch which turns the power of
this monitor on and off.
Press once (switch remains down (;)) to turn on the
power of the monitor.
Press again (switch comes up (l)) to turn off the power
of the monitor.
Note: There may be a delay of several seconds until the
monitor display comes on.
wPower Indicator
This Indicator is on when the monitor‘s power is turned
on.
eInput Signal Select Switch (INPUT A/B)
This is a push-push type switch which selects the signal
input A or B.
Press once (switch remains down (;)) to select the
INPUT B signal.
Press again (switch comes up (l)) to select the INPUT
A signal.
rMenu Button (MENU)
Press to display the setup menu.
tCursor Buttons (D,C)
Press these buttons to select a parameter by moving the
cursor up or down in the parameter rows.
yIncrement/Decrement Buttons (AUDIO –, +)
• Setup screen adjustment (Menu displayed)
Press these buttons to adjust the level of an item select-
ed in the setup menu.
Note: If you select NORMAL SETTINGS in the Setup
menu, and press the Increment/Decrement button
(–) or (+), all menu parameters will be restored to
the factory default settings.
• Audio adjustment (Menu not displayed)
Press these buttons to increase or decrease the sound
volume.
uFocus Control (FOCUS)
This control adjusts the screen focus.
iScreen Control
This control is preset at the factory.
oAudio Input Connector (AUDIO IN)
For input of audio signal from an outboard device.
!0 Audio Output Connector (AUDIO OUT)
The audio input signal connected to the audio input con-
nector ois looped through to this connector.
!1 Video A input Connector (VIDEO A IN)
For input of the PAL composite video signal from an out-
board device.
!2 Video A output Connector (VIDEO A OUT)
The video input signal connected to the video input con-
nector !1 is looped through to this connector and termi-
nated automatically.
!3 Video B input Connector (VIDEO B IN)
For input of the PAL composite video signal from an out-
board device.
!4 Video B output Connector (VIDEO B OUT)
The video input signal connected to the video input con-
nector !3 is looped through to this connector and termi-
nated automatically.
!5 AC Connector (AC IN)
Connector for AC power supply cord.

– 2 –
ADJUSTMENT PROCEDURE
1. Test Equipments Required
8The following Test Equipments are required for
adjustment of the Colour Video Monitor WV-CM1020.
8Video Signal Generator
Colour Bar Signal
Grayscale Signal (8 stair steps)
Crosshatch Signal or Dot Signal
White Raster Signal
Red, Green, Blue each Raster Signal
8Monoscope Pattern Signal Generator
8Audio Analyzer
8Oscilloscope
8Digital Voltmeter
8Degaussing Coil
8Ceramic Screwdriver
8Electric Torque Driver
2. Disassembling Procedure for the
Adjustment
8Referring to Fig. 2-1, remove seven screws that secure
the Upper Cover and remove the Upper Cover.
Fig. 2-1
3. Connection and Setting up for
Adjustment
3.1. Connection
8Fig. 3-1 shows the connecting diagram for adjustment
procedure of the WV-CM1020.
Remove seven screws.
Upper Cover
Fig 3-1
8Connect the coaxial cable between Video Input Connector
of the WV-CM1020 and Video Output Connector of Video
Signal Generator.
8The Fig. 3-2 shows the connecting diagram for the Audio
section adjustment procedure.
Fig 3-2
8Connect the Oscillator Output terminal of the Audio
Analyzer and the Audio Input Connector of the WV-
CM1020.
8Disconnect the Speaker from CN601 on the Main Board.
8Connect the Input terminal of the Audio Analyzer and the
Audio Output Connector of the WV-CM1020 through
Selector (Audio Out or Speaker Out) SW1.
8Terminate the Speaker Output signal with 8 Ω3W.
8After completion of adjustment, connect the Speaker to
CN601 on the Main Board.
3.2. Setting Up
8This adjustment should be done after 20 minutes warm up
of the WV-CM1020.
< Initial Setting >
8Turn the Power Switch on.
8Select the Cursor Buttons (i) or (o) to the NORMAL
SETTINGS position.
8Press the Increment Button (+) or Decrement Button (–),
and then all the setting are initialized.
8Turn the Power Switch off.
WV-CM1020
Video Signal Generator
VIDEO IN
WV-CM1020 (Main Board)
SW1
OSC
OUT IN
AUDIO ANALYZER
AUDIO
OUT SPEAKER
OUT
8 Ω / 3 W
31
AUDIO
IN AUDIO
OUT MONITOR CN601

–3 –
< Service Menu >
8Turn the Power Switch on while pressing the Increment
Button (+), the Decrement Button (–) and the MENU
Button simultaneously, and enter to the Service Menu
mode.
8Press the MENU Button once, and enter to the DEF
MENU.
8The item of the DEF MENU changes as shown in Fig. 3-3.
Fig. 3-3
8Press the MENU Button once, and enter to the W/B
MENU.
8The item of the W/B MENU changes as shown in Fig. 3-4.
Fig. 3-4
8Press the MENU Button once, and enter to the SUB
MENU.
8The item of the SUB MENU changes as shown in Fig. 3-5
Fig. 3-5
8Press the MENU Button once, and enter to the ADJ
MENU.
8The ADJ MENU is as shown in Fig. 3-6.
Fig. 3-6
4. Adjustment Procedure
8Refer to the Location of the Test Points and
Adjusting Controls on the page 8.
(1). 120V Adjustment
Test Point: TP804 (120V) CRT Board
Adjust: +B Increment Button (+)
Decrement Button (–)
SCREEN Control
Flyback Transformer on the Main Board
8Supply the Monoscope Pattern signal to Video Input
Connector.
8Connect the Digital Voltmeter to TP804.
8Select the MENU Button to the DEF MENU.
8Select the Cursor Buttons (i) or (o) to the +B position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that +B becomes 65.
8Adjust the SCREEN control so that the stair step of the
Monoscope pattern is visibly certain.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the DC voltage at TP804 becomes 120 ± 0.2 V.
8Supply the Grayscale signal to Video Input Connector.
8Select the Cursor Buttons (i) or (o) to the ABL IN
position, and then the reference voltage is inputted to the
micro computer.
8Select the MENU Button to the ADJ MENU.
8Select the Cursor Buttons (i) or (o) to the MENU END
position.
8Press the Increment Button (+) or Decrement Button (–)
for saving data.
8Turn the Power Switch off.
1 STD BRIGHT 70
2 MAX CONTRAST 76
3 STD COLOUR 72
4 MAX AUDIO 163
Pressing
the Cursor Button (o)
Pressing
the Cursor Button (i)
ADJ MENU
ABL/ACL ACL
ALL RESET ON
MENU END NO SAVE
1 CUTOFF R 0 197
2 CUTOFF G 78
3 CUTOFF B 0 124
4 DRIVE R 189
5 DRIVE B 112
6 SERVICE SW OFF
Pressing
the Cursor Button (o)
Pressing
the Cursor Button (i)
1 H CENTER 9
2 +B 53
3 ABL IN 226
4 MENU SIZE 40
Pressing
the Cursor Button (o)
Pressing
the Cursor Button (i)

– 4 –
(2). Screen Cut off Coarse Adjustment
Test Point: TP802 (G) CRT Board
Adjust: CUTOFF G Increment Button (+)
Decrement Button (–)
SCREEN Control
Flyback Transformer on the Main Board
8Turn the Power Switch on while pressing the Increment
Button (+), the Decrement Button (–) and the MENU
Button simultaneously, and enter to the Service Menu
mode.
8Supply the Grayscale signal to Video Input Connector.
8Connect the Oscilloscope to TP802.
8Set the Input Selector of the Oscilloscope to the DC Mode.
8Select the MENU Button to the W/B MENU.
8Select the Cursor Buttons (i) or (o) to the CUTOFF G
position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that G Pedestal becomes 110 ± 2 V as shown in Fig. 4-1.
Fig. 4-1
8Adjust the SCREEN control so that the 8th step of stair
step becomes cut off.
(3). Contrast Adjustment
Test Point: TP802 (G) CRT Board
Adjust: MAX CONTRAST Increment Button (+)
Decrement Button (–)
8Connect the Oscilloscope to TP802.
8Set the Input Selector of the Oscilloscope to the AC Mode.
8Select the MENU Button to the SUB MENU.
8Select the Cursor Buttons (i) or (o) to the MAX
CONTRAST position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the output of TP802 becomes 40 Vp-p as shown in
Fig. 4-2.
Fig. 4-2
(4). Colour Adjustment
Test Point: TP803 (B) CRT Board
Adjust: STD COLOUR Increment Button (+)
Decrement Button (–)
8Supply the Colour Bar signal to the Video Input Connector.
8Connect the Oscilloscope to TP803.
8Select the Cursor Buttons (i) or (o) to the STD
COLOUR position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the output of TP803 becomes 15 Vp-p as shown in
Fig. 4-3.
Fig. 4-3
(5). H & V Centering and Size Coarse Adjustment
Adjust: VR401 (V-SIZE) Main Board
VR403( V-CENTER) Main Board
L502 (H-SIZE) Main Board
H-CENTER Increment Button (+)
Decrement Button (–)
Observe: Colour Video Monitor
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Select the MENU Button to the DEF MENU.
8Select the Cursor Buttons (i) or (o) to the H–CENTER
position.
8Adjust VR403 so that the Monoscope Pattern signal
positions at the vertical center on the CRT screen.
8Adjust VR401 so that the full vertical height becomes plus
6 % overscanning.
8Ajust L502 so that the full horizontal width becomes plus 8
% overscanning.
110 ±0.2 V
GND
15 Vp-p
40 Vp-p

– 5 –
8Adjust the Increment Button (+) or Decrement Button (–)
so that the screen is set to the horizontal center position.
8Repeat above adjustment until they are satisfied.
(6). Character Size Adjustment
Test Point: Emitter of Q118
Adjust: MENU SIZE Increment Button (+)
Decrement Button (–)
8Supply the Colour Bar signal to the Video Input
Connector.
8Connect CH1 of the Oscilloscope to the Emitter of Q118.
8Connect CH2 of the Oscilloscope to the Video Output
Connector.
8Select the MENU Button to the DEF MENU.
8Select the Cursor Buttons (i) or (o) to the MENU SIZE
position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the H-scan time becomes 44 ± 0.5 µs as shown in
Fig. 4-4.
Fig. 4-4
(7). Audio Maximum Output Power Setting
Adjust: MAX AUDIO Increment Button (+)
Decrement Button (–)
Observe: Audio Analyzer
8Set the Selector (Audio Out or Speaker Out ) SW1 to the
Speaker Out position.
8Set the Output Level of the Audio Analyzer to -14±0.3
dBV, 1 kHz ± 3 %.
8Select the MENU Button to the SUB MENU.
8Select the Cursor Buttons (i) or (o) to the MAX AUDIO
position.
8Observing the Audio Analyzer, adjust the Increment
Button (+) or Decrement Button (–) so that the output level
becomes 5. 2± 0.2 dBV.
(8). Screen Cut off Fine Adjustment
Test Point: TP802 (G) CRT Board
Adjust: STD BRIGHT Increment Button (+)
Decrement Button (–)
CUTOFF G Increment Button (+)
Decrement Button (–)
SCREEN Control
Flyback Transformer on the Main Board
8Supply the Grayscale signal to the Video Input Connector.
8Connect the Oscilloscope to TP802.
8Set the Input Selector of the Oscilloscope to the DC mode.
8Select the Cursor Buttons (i) or (o) to the STD BRIGHT
position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the STD BRIGHT becomes 70.
8Select the MENU Button to the W/B MENU.
8Select the Cursor Buttons (i) or (o) to the CUTOFF G
position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the G Pedestal becomes to 110 ± 2 V as shown in
Fig. 4-5.
Fig. 4-5
8Adjust the SCREEN control so that the 8th step of the stair
step becomes cut off.
(9). White Balance Coarse Adjustment
Adjust: CUTOFF R Increment Button (+)
Decrement Button (–)
CUTOFF B Increment Button (+)
Decrement Button (–)
DRIVE R Increment Button (+)
Decrement Button (–)
DRIVE B Increment Button (+)
Decrement Button (–)
Observe: Colour Video Monitor
8Select the Cursor Buttons (i) or (o) to the CUTOFF R,
CUTOFF B, DRIVE R or DRIVE B position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the 2nd step and the 7th step of the stair step
become white.
44.0 ±0.5 µs
H
CH1
CH2
110 ±0.2 V
GND

– 6 –
(10). Focus Coarse Adjustment
Adjust: FOCUS control
Flyback Transformer on the Main Board
Observe: Colour Video Monitor
8Supply the Cross Hatch signal or the Dot signal to the
Video Input Connector.
8Adjust the FOCUS control for the best focus.
(11). Purity Adjustment
Adjust: Purity Magnet
Deflection Coil
Observe: Colour Video Monitor
8This adjustment should be done after aging for more than
20 minutes.
8Adjust the FOCUS control on the Flyback Transformer for
the best focus and then disconnect the input signal.
8Degauss the CRT screen with a degaussing coil.
8Loosen the screw that secure the deflection coil.
8Move back the deflection coil until it reaches to the purity
magnet.
Fig. 4-6
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. 4-7.
Fig. 4-7
8Rotate the deflection coil to find the point where the center
portion of the red area becomes equal on the CRT screen.
8Move the deflection coil forward until the red colour fully
occupies the entire screen and tighten the screws that
secure the deflection coil.
(12). Convergence Adjustment
Adjust: Convergence magnet-1
Convergence magnet-2
Observe: Colour Video Monitor
8Supply the Cross Hatch signal or the Dot Signal to the
Video Input Connector.
8Adjust the FOCUS control on the Flyback Transformer for
the best focus.
8Degauss the CRT screen with a degaussing coil.
8Adjust the Convergence magnet-2 so that the red and
blue dots on the center area of the CRT screen is
overlapped.
8Adjust the Convergence magnet-1 so that the green and
magenta (red+blue) dots on the center area of the CRT
screen is overlapped.
8Repeat above adjustment until no discrepancy appears on
the entire screen.
(13). White Balance Adjustment
Adjust: CUTOFF R Increment Button (+)
Decrement Button (–)
CUTOFF B Increment Button (+)
Decrement Button (–)
DRIVE R Increment Button (+)
Decrement Button (–)
DRIVE B Increment Button (+)
Decrement Button (–)
Observe: Colour Video Monitor
8Supply the White Colour signal or the Dot Signal to the
Video Input Connector.
8Select the MENU Button to the W/B MENU.
8Select the Cursor Buttons (i) or (o) to the CUTOFF R,
CUTOFF B, DRIVE R or DRIVE B position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the raster on the CRT Screen becomes White.
(14). Sub Bright Adjustment
Adjust: STD BRIGHT Increment Button (+)
Decrement Button (–)
Observe: Colour Video Monitor
8Supply the Grayscale signal to the Video Input Connector.
8Isolate the CRT screen from the outside light source.
8Select the MENU Button to the SUB MENU.
NO GOOD GOOD
RED RED
Deflection coil
Deflection coil fixing screw
Purity magnet
Convergence magnet-1
Convergence magnet-2

– 7 –
8Select the Cursor Buttons (i) or (o) to the STD BRIGHT
position.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the first step from the black side is just
suppressed.
8Select the MENU Button to the DEF MENU.
8Select the Cursor Buttons (i) or (o) to the ABL IN
position for saving data.
(15). H & V Centering and Size Fine Adjustment
Adjust: VR401 (V-SIZE) Main Board
VR403 (V-CENTER) Main Board
L502 (H-SIZE) Main Board
H-CENTER Increment Button (+)
Decrement Button (–)
Observe: Colour Video Monitor
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Select the MENU Button to the DEF MENU.
8Select the Cursor Buttons (i) or (o) to the H–CENTER
position.
8Adjust VR403 so that the Monoscope Pattern signal
positions at the vertical center on the CRT screen.
8Adjust VR401 so that the full vertical height becomes plus
6 % overscanning.
8Ajust L502 so that the full horizontal width becomes plus 8
% overscanning.
8Adjust the Increment Button (+) or Decrement Button (–)
so that the screen is set to the horizontal center position.
8Repeat above adjustment until they are satisfied.
8Select the MENU Button to the ADJ MENU.
8Select the Cursor Buttons (i) or (o) to the MENU END
position.
8Press the Increment Button (+) or Decrement Button (–)
for saving data.
8Turn the Power Switch off.