Panasonic WVBM990 - VIDEO MONITOR User manual

SPECIFICATIONS
Power Source : 220-240 V AC, 50 Hz
Power Consumption : Approx. 28 W
Screen Size : 245 mm (9-5/8’’) diagonal tube size, 90° deflection.
220 mm (8-11/16’’) diagonal actual visual size.
Horizontal Resolution : 800 TV lines at centre
Video Input : 1.0 V[p-p] composite/75 Ω, BNC with Auto Termination
Video Output : Looped through video input, BNC
Horizontal Scanning Frequency : 15.625 kHz
Vertical Scanning Frequency : 50 Hz
Sweep Linearity : Horizontal; Less than 5 %
Vertical; Less than 5 %
Ambient Operating Humidity : Less than 90 %
Ambient Operating Temperature : –10°C - +50°C (14°F - 122°F)
Dimensions : 221 (W) x 220 (H) x 262 (D) mm [8-11/16’’ (W) x 8-11/16 (H) x 10-5/16’’]
Weight : 5.2 kg(11.5 lbs.)
Weight and dimensions shown are approximate.
Specifications are subject to change without notice.
OPTIONAL ACCESSORY
Rack Mount Bracket ............................................. WV-Q29E
WV-BM990
ORDER NO. AVS0004254C8
POWER
VideoMonitorWV-BM
990
ON
OFF
VHOLDBRIGHTCONTRAST
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Conductor View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

– 1 –
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS
Video Monitor WV-BM
POWER
OFF
ON
V.HOLD BRIGHT CONTRAST
VIDEO IN VIDEO OUT
q w r t y u
i
e
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.
wPower Indicator
This indicator is on when the monitor’s power is turned
on.
eVertical Hold Control (V-HOLD)
This control is used to lock the vertical position of the
picture.
rBrightness Control (BRIGHT)
Adjusts the picture brightness. Turn this counterclock-
wise to increase the picture brightness, and turning the
control clockwise has the reverse effect.
tContrast Control (CONTRAST)
Adjusts the picture contrast. Turn this counterclockwise
to increase the picture contrast, and turning the control
clockwise has the reverse effect.
yVideo Input Connector (VIDEO IN)
For input of the composite video signal from the out-
board device.
uVideo Output Connector (VIDEO OUT)
The video input signal connected to the video input con-
nector yis looped through to this connector and termi-
nated automatically.
iAC Power Cord
Plug the power cord to an AC outlet.
●Front View ●Rear View

– 2 –
ADJUSTMENT PROCEDURE
1. Test Equipments Required
8The following Test Equipments are required for
adjustment of the Video Monitor WV-BM990.
8Video Signal Generator (Crosshatch Signal)
8Monoscope Pattern Signal Generator
8Oscilloscope
8Digital Voltmeter
8Degaussing Coil
8Ceramic Screwdriver
8Electric Torque Driver
2. Disassembling Procedure for the
Adjustment
8Referring to Fig. 2-1, remove eight screws that secure the
Upper Cover and the Rear Cover. Remove the Upper
Cover and the Rear 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-BM990.
Fig 3-1
Remove eight screws.
Upper Cover
Rear Cover
8Connect the coaxial cable between Video Input Connector
of the WV-BM990 and Video Output Connector of Video
Signal Generator.
3.2. Setting Up
8Set the every adjusting VRs to their mechanical center
positions.
8This adjustment should be done after 20 minutes warm up
of the WV-BM990.
4. Adjustment Procedure
8Refer to the Location of the Test Points and
Adjusting Controls on the page 4.
(1). Freerun Adjustment
Test Point: Pin H+ of CN501 (H+) Main Board
Adjust: VR501 (H-HOLD) Main Board
VR515 (H.PRESET) Main Board
8Disconnect all the input signals from the WV-BM990.
8Connect the Frequency Counter to Pin H+ of CN501.
8Fix VR501 (H-HOLD) at its center position.
8Adjust VR515 so that the frequency becomes 15.400 kHz
± 50 Hz.
(2). Cut Off Voltage Adjustment
Adjust: VR401 (V-HOLD) Main Board
Deflection Coil (DY)
VR301 (CONTRAST) Main Board
VR302 (BRIGHT) Main Board
VR602 (SUB-BRIGHT) CRT Board
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Adjust VR401 to hold picture vertically.
8Adjust the Deflection Coil so that the edges of the
Monoscope Pattern are visible in the monitor screen.
8Turn VR301 fully counterclockwise.
8Turn VR302 to its mechanical center position.
8Adjust VR602 so that the Raster just appear.
(3). Picture Tilt Adjustment
Adjust: Deflection Coil (DY)
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Loosen the Deflection Coil Holding Screw as shown in Fig.
4-1.
WV-BM990
Video Signal Generator
VIDEO IN

– 3 –
Fig. 4-1
8Turn the Deflection Coil until the raster becomes straight
on the monitor screen.
8Tighten the Deflection Coil Holding Screw carefully.
Note: When fixing the Deflection Coil Holding Screw, push
the Deflection Coil to connect to CRT tightly.
(4). Centering and Horizontal Size Adjustment
Adjust: VR301 (CONTRAST) Main Board
VR302 (BRIGHT) Main Board
Centering Magnets
L501 (H.SIZE) Main Board
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Fix VR301 and VR302 at their center positions.
8Adjust the Centering Magnets as shown in Fig. 4-1 until
the Monoscope Pattern signal comes to the center on the
monitor screen.
8Adjust L501 so that the full Horizontal Width becomes plus
6% overscanning.
8Repeat adjusting the Centering Magnets and L501 until
satisfactory.
(5). Vertical Height and Vertical Linearity Adjustment
Adjust: VR408 (V.SIZE) Main Board
VR412 (V.LINE) Main Board
Centering Magnets
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Fix VR301 and VR302 at their mechanical center positions.
8Adjust VR408 so that the full Vertical Height becomes plus
6% overscanning.
8Adjust VR412 so that the circle portion of the Monoscope
Pattern signal becomes nearly a true circle.
8Adjust the Centering Magnets so that the full Horizontal
Width and full Vertical Height become the same
overscanning rate.
8Repeat adjusting VR408, VR412 and the Centering
Magnets until satisfactory.
(6). Focus Adjustment
Adjust: VR601 (FOCUS) CRT Board
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Adjust the VR601 for the best focus in the monitor screen.
(7). Raster Distortion Adjustment
Adjust: Deflection Magnets
Observe: Video Monitor Screen
8Supply the Crosshatch signal to the Video Input Connector.
8Adjust 8 magnets as shown in Fig. 4-2 so that the raster
distortion becomes minimum.
Fig. 4-2
8The raster distortion against 8 magnets are as shown in
Fig. 4-3.
Fig. 4-3
Loosen Deflection Coil Holding Screw.
Centering Magnets
Deflection Coil
Adjust eight magnets.

– 4 –
MAIN BOARD
(COMPONENT SIDE)
VR501
(H-HOLD)
VR515
(H.PRESET)
VR408
(V.SIZE)
VR412
(V.LINE)
VR301
(CONTRAST) VR302 (BRIGHT) VR401 (V-HOLD) SW801
(POWER
SWITCH)
L501(H.SIZE)
CN501
CN501
CN601
TP5 TP6
CN302 CN301
TP1
TP3 TP2
H+
H–
V–
V+
TP7
TP4
REAR SIDE
FRONT SIDE
VR602
(SUB-BRIGHT)
VR601
(FOCUS)
CRT BOARD
(COMPONENT SIDE)
LOCATION OF TEST POINTS AND ADJUSTING CONTROLS

MAIN BOARD CRT BOARD
101
750
104
154 222
470 223
822
102
102
562
181
133
392
153 103
820
681
122
101
221 101
392
272
560
104
102
221
431
273
101
103 121
471
474
223
223
102 102
563
103 473
822 333
562 563
202
OPEN
103
103
100
222
823
IC501
391
152
VR401 103 101
R423 183
R406
103
103
473
563
122
392
393
122 332
104
VR412 502
R407 2802R422 221
C406
220/16V
R409
152
R410 392
103
102
393
104
393
394 154
474 474
104 334
105
151 182
333
400V 393
400V
333
120
680
562
390
683
271
153
682
8R2
6R8
5R6
153 152
473
R800
0R56 3W
181 471
TP1
TP2
470
IC801
C803 224/100V
J801
J802
R808 394
5230
2260
SHORT
9311
H+
K
V101
OPEN OPEN
OPEN
OPEN
250V
205
GND
105
R413
1R8 3W
R411 6651
D401
501
R403
1242
E101
123
3652
1%
4121
1%
CN302
VIDEO INPUT
CONNECTOR
CN301
VIDEO OUTPUT
CONNECTOR
SW801
POWER SWITCH
AC POWER
CORD
VR301
CONTRAST
VR302
BRIGHT
VR401
V-HOLD
VR408
V.SIZE
VR412
V.LINE
L501
H.SIZE
VR515
H.PRESET
VR501
H-HOLD
VR602
SUB-
BRIGHT
VR601
FOCUS
Y
Y
Y
Y
Y
Y
Y
Y
Y
YY
Y
Y
Y
Y
Important safety notice
Components Identified by " Y" mark have special characteristics for safety.
When replacing any of these components, use only manufacturer's specified parts.
123 45 6
C
B
A
F801
2A 250V
FS2FS1
GRN
BLK/BROWN
BLUE/
WHT
R418
561 0.5W
Q502
T501
T502
D501
D506
Q503
Q501
Q504
C407
47/25V
Q306 Q307
Q801
PT801
SW801
CN803
CN802
D801
Q302
Q303
Q304
Q309
Q308
Q301
Q305
Y
R
W
Q
Q
R
U
Y
W
I
SCHEMATIC DIAGRAM
– 5 –

MAIN BOARD MAIN BOARD
CRT BOARD
(Component Side View) (Component Side View) (Pattern Side View) (Pattern Side View)
DY
123 45 6
C
B
A
IC801
14.0
0
1.3
Pin1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
IC501
4.0
6.7
3.8
11.8
5.5
2.0
11.3
5.7
0.6
6.9
4.8
3.5
4.1
2.3
4.1
1.6
Q301
302
303
304
305
306
307
308
309
501
502
503
504
801
B
6.0
2.3
9.2
3.1
11.9
12.4
0.2
2.1
3.5
0.6
–0.1
0.6
0
17
C
12.4
9.2
5.8
0
1.0
0.4
3.1
3.5
69.8
10.5
12.3
10.5
0.6
12.4
E
5.3
1.7
9.9
3.6
12.4
12.4
3.1
3.1
3.1
0
0.1
0.6
0
17.6
< VOLTAGE >
MAIN BOARD
2. 5 ms/DIV, 1 V/DIV 3. 20 µ s/DIV, 20 V/DIV1. 5 ms/DIV, 5 V/DIV
< WAVEFORM >
MAIN BOARD
Note: The value indicated in the schematic diagram should be read as follows:
Multiplier (0 - 5)
2nd. Significant Digit (0 - 9)
1st. Siginificant Digit (1 - 9)
<Example> For Capacitor:
(Except Electrolytic Capacitor and Tantalum Capacitor):
820 B82 x 10 = 82 pF
102 B10 x 10 = 1000 pF = 0.001 µF
104 B10 x 10 = 100000 pF = 0.1 µF
0
2
4
For Coil:
010 B1 x 10 = 1 µH
8R2 B8.2 x 10 = 8.2 µH
101 B10 x 10 = 100 µH
0
2
4
0
1
3
For Resistor:
330 B33 x 10 = 33 Ω
561 B56 x 10 = 560 Ω
123 B12 x 10 = 12k Ω
0R00 = 0 Ω
IC501 C4
IC801 A3
Q301 C2
Q302 C2
Q303 C2
Q304 C3
Q305 C2
Q306 C2
Q307 C2
Q308 C3
Q309 C3
Q501 A5
Q502 A5
Q503 A4
Q504 B4
Q801 A3
< INDEX >
MAIN BOARD D301 C3
D401 B4
D402 A4
D403 B3
D404 B3
D409 B4
D501 A5
D503 A6
D504 A6
D505 B3
D506 B4
D801 A2
D805 A4
IC501 B2
IC801 C2
Q301 A1
Q302 B1
Q303 B1
Q304 B1
Q305 A1
Q306 B1
Q307 B1
Q308 B1
Q309 B1
Q501 B2
Q502 B2
Q503 B2
Q504 B2
Q801 C2
< INDEX >
MAIN BOARDD301 B1
D401 B1
D402 C1
D403 B1
D404 B2
D409 A1
D501 A2
D503 B3
D504 B3
D505 B3
D506 B2
D801 C1
D805 C1
– 6 –
CONDUCTOR VIEW

Video Monitor WV-BM
VideoMonitorWV-BM
PACKAGING
THT4C0004 Pan Head Tapping Screw and Washer Assy
XTV3+12C Blazer Head Tapping Screw
XSB3+10FX Binding Head Screws
XTW3+10G Washer Head Tapping Screws
XTB4+12A Binding Head Tapping Screws
THT4C0005 Pan Head Tapping Screw and Washer Assy
XNGB4C002 Hexagon Head Nut
XTB4+15A Binding Head Tapping Screws
XTB4+8F Binding Head Tapping Screw
XWC4BFY Internal Toohted Lock Washer
XYA4+EF8 Binding Head Tapping Screw and Washer Assy
XTB3+8FN Binding Head Tapping Screws
XTB3+10JFN Binding Head Tapping Screws
XYA4+BA20FX Binding Head Tapping Screw and Washer Assy
TUC4C0198C Washers
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
ScrewsNo. Description
Numbers show screws, washers, nuts and etc.
1
M17
M36 M31
M41, M42
M49
M49
M50
M45
M46
M18
M22
M20
M21
M13
M12
M14
M11
M4
V101
M1
M7
M19
M4
M4
M2
M35
M16
M8
M8
M23
PT801
E101
M3
M4
M6
M8
M8
M32
M26
M25
PCB2
PCB1
M15
12
3
4
8
8
15 15
5
4
8
9
10 11
12
13
13
13
WV-BM990
14
14
14
14
7
6
EXPLODED VIEW
– 7 –