Panasonic WV-BM1790 Service Manual ▷ View online
SPECIFICATIONS
Power source :
100 V - 240 V AC, 50/60 Hz
Power consumption :
approx. 27 W
Screen size :
443 mm (17-7/16”) diagonal tube size
413 mm (16-1/4’’) diagonal viewing size
413 mm (16-1/4’’) diagonal viewing size
Horizontal resolution :
1 000 TV lines at centre
Video Input :
1.0 V[p-p] CCIR composite/75
Ω
, BNC
(selectable 1.0 V[p-p] EIA composite/75
Ω
)
Video output :
looped through input with auto termination, BNC
Horizontal scanning frequency :
15.625 kHz (15.75 kHz)
Vertical scanning frequency :
50 Hz (60 Hz)
Sweep linearity :
horizontal; less than 5 %
vertical; less than 5 %
vertical; less than 5 %
Sweep geometry :
less than 2 %
Overscanning :
approx 6 %
Ambient operating humidity :
less than 90 %
Ambient operating temperature :
–10°C - +50°C (14°F - 122°F)
Dimensions :
406 mm (W) x 354 mm (H) x 398 mm (D) [16’’ (W) x 13-15/16'' (H) x 15-11/16’’ (D)]
Weight :
13.0 k
g
(28.6 lbs.)
Weight and dimensions shown are approximate.
Specifications are subject to change without notice.
Specifications are subject to change without notice.
WV-BM1790
ORDER NO. AVS0110396C8
POWER
Video Monitor
WV-BM
1790
ON
OFF
V HOLD
BRIGHT
CONTRAST
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A l l r i g h t s r e s e r v e d . U n a u t h o r i z e d c o p y i n g a n d
d i s t r i b u t i o n i s a v i o l a t i o n o f l a w .
d i s t r i b u t i o n i s a v i o l a t i o n o f l a w .
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.
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.
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.
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.
the operation and maintenance of this has been included.
Therefore, it should be read carefully in order to avoid
any problems.
T
here 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Conductor View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STANDARD ACCESSORY
Power Cord ................................................................. 2 pcs.
OPTIONAL ACCESSORY
Rack Mounting Bracket............................................... WQ-LM170E
– 1 –
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS
Q W
E R T
Y U I
O
Video Monitor WV-BM
1790
POWER
ON
OFF
V.HOLD
BRIGHT
CONTRAST
Q
Power Button (POWER ON/OFF)
This button turns the monitor power on and off.
W
Power Indicator
Is on when the monitor power is turned on.
E
Vertical Hold Control (V-HOLD)
This control is used to lock the vertical position of the
picture.
picture.
R
Brightness Control (BRIGHT)
Adjusts the picture brightness. Turn this control coun-
terclockwise to increase the brightness, and turn it
clockwise to reduce the brightness.
terclockwise to increase the brightness, and turn it
clockwise to reduce the brightness.
T
Contrast Control (CONTRAST)
Adjusts the picture contrast. Turn this control counter-
clockwise to increase the contrast, and turn it clock-
wise to reduce the contrast.
clockwise to increase the contrast, and turn it clock-
wise to reduce the contrast.
■
Front View
AC IN
OUT
VIDEO
IN
CCIR
EIA
■
Rear View
Y
TV Standard Selector (CCIR/EIA)
Selects either TV standard CCIR or EIA.
U
Video Input Connector (VIDEO IN)
For inputting a composite video signal from an external
device.
device.
I
Video Output Connector (VIDEO OUT)
The video input signal connected to the video input
connector is looped through to this connector and ter-
minated automatically.
connector is looped through to this connector and ter-
minated automatically.
O
AC Inlet Socket (AC IN)
Plug the power cord (supplied as a standard accesso-
ry) into this socket and connect it to an AC outlet.
ry) into this socket and connect it to an AC outlet.
2
1. Test Equipment Required
8
The following test equipments are required for adjustment
of the Video Monitor WV-BM1790.
8
Video Signal Generator (Monoscope Pattern signal,
Stairstep signal and Cross-hatch signal)
8
Frequency Counter
2. Disassembling Procedure for
Adjustment
8
Referring to Fig. 2-1, remove eight screws that secure the
Upper Cover and remove the Upper Cover.
Fig. 2-1
3. Connection and Setting Up for
Adjustment
3.1. Connection
8
The Fig. 3-1 shows the connecting diagram for adjustment
procedure of the WV-BM1790 using the Video Signal
Generator.
Fig. 3-1
8
Connect the Video Output Connector of the Video Signal
Generator to the Video Input Connector of the WV-
BM1790.
8
Connect the probe of the Frequency Counter to desired
Test Point in each adjustment step.
ADJUSTMENT PROCEDURE
3.2. Setting Up
8
Set the Video Signal Generator so that it provides the
Monoscope Pattern signal.
3.3. Initial Position of the Switches and
Level Controls for Adjustment
Main Board
TV Standard Selector (SW201).....................CCIR position
CONTRAST (VR101) ............................Mechanical Center
BRIGHT (VR102) ..................................Mechanical Center
V-HOLD (VR201) ..................................Mechanical Center
H-HOLD (VR301) ..................................Mechanical Center
V-HEIGHT (VR202) ...............................Mechanical Center
SUB V-HEIGHT (VR205) ......................Mechanical Center
V-LIN (VR204) .......................................Mechanical Center
CRT Board
SUB BRIGHT (VR103) ..........................Mechanical Center
FOCUS (VR104) ..................................Mechanical Center
8
The adjustment should be done with this initial setting,
unless otherwise specified.
4. Adjustment Procedure
8
Refer to the Location of the Test Points and Adjusting
Controls on page 5.
(1). Sub-Brightness Coarse Adjustment
Test Point: Video Monitor Screen
Adjust:
VR201 (V-HOLD)
Main Board
VR301 (H-HOLD)
Main Board
VR101 (CONTRAST)
Main Board
VR103 (SUB BRIGHT)
CRT Board
8
Supply the Monoscope pattern signal to the Video Input
Connector.
8
Adjust VR201 to hold picture vertically.
8
Adjust VR301 to hold picture horizontally.
8
Turn the CONTRAST Control to fully clockwise.
8
Adjust VR103 so that the raster will just appear.
8
Turn the CONTRAST Control to its mechanical center
position.
Remove eight screws.
Upper Cover
WV-BM1790
Video Signal Generator
VIDEO IN
