Panasonic WV-CM1480 User manual

SPECIFICATIONS
Power Source : 120 V AC, 60 Hz
Power Consumption : WV-CM2080: 90 W
WV-CM1780: 73 W
WV-CM1480: 70 W
Screen Size : WV-CM2080: 548 mm (21-9/16”) diagonal tube size
508 mm (20”) viewable size
WV-CM1780: 444 mm (17-1/2”) diagonal tube size
406 mm (16”) viewable size
WV-CM1480: 394 mm (15-1/2”) diagonal tube size
356 mm (14”) viewable size
Horizontal Resolution : WV-CM2080: More than 500 TV lines at center
WV-CM1780: More than 800 TV lines at center
WV-CM1480: More than 750 TV lines at center
S-video Input : Y: 1.0 V[p-p]/75 Ω, C: 0.286 V[p-p]/75 Ω, Mini DIN jack
Video Input : 1.0 V[p-p] composite/75 Ω, BNC (x2)
Video Output : Looped through input with Auto Termination, BNC (x2)
Audio Input : –8 dB/Hi-Z, RCA pin-jack (x2)
Audio output : Looped through input, RCA pin-jack (x2)
Horizontal Scanning Frequency : 15.734 kHz
Vertical Scanning Frequency : 60 Hz
Sweep Linearity : Horizontal: Less than 5 %
Vertical: Less than 5 %
Sweep Distortion : Less than 2 %
Speaker Output : 0.7 W
Data Port : 6-conductor Modular Jack (x2)
Standby On/Off Terminal : 1 circuit
Ambient Operating Humidity : Less than 90 %
Ambient Operating Temperature : –10°C - +50°C (14°F - 122°F)
R
WV-CM1480/WV-CM1780/WV-CM2080
ORDER NO. AVS0104348C1
S06
POWER
Video Monitor
WV-CM
2080
ON
OFF
AUDIO
MENU
STANDBY
INPUT
SELECT
C2001 Matsushita Communication Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
Color 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
Dimensions : WV-CM2080: 482 (W) mm x 443 (H) mm x 476 mm (D) [19”(W) x 17-7/16”(H) x 18-3/4”(D)]
WV-CM1780: 406 mm (W) x 354 mm (H) x 426 mm (D) [16”x 13-15/16”x 16-13/16”]
WV-CM1480: 370 mm (W) x 352 mm (W) x 399 mm (D) [14-9/16”x 13-7/8”x 15-11/16”]
Weight : WV-CM2080: 26.0 kg(57.3 lbs)
WV-CM1780: 18.5 kg(40.8 lbs.)
WV-CM1480: 15.0 kg(33.1 lbs.)
Weight and dimensions shown are approximate.
Specifications are subject to change without notice
ACCESSORIES
Power Cord ................................................................. 1 pc.
Rack Mounting Bracket ............................................... 2 pcs. (WV-CM2080)
Fixing Screws for Rack Mounting Bracket .................. 8 pcs. (WV-CM2080)

SAFETY PRECAUTIONS
GENERAL GUIDELINE
1. When service is required, observe the original lead dress.
Components, wires or cables that indicate evidence of
overheating or other electrical or mechanical damage
should be replaced.
2. After servicing see to that all the protective devices, such
as insulation tape, shields must be properly installed.
3. After servicing, make the following leakage current checks
to prevent the customer from being exposed to shock
hazards.
LEAKAGE CURRENT COLD CHECK
1.Unplug the AC cord and connect a jumper between the
two prongs on the plug.
2.Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the equipment such as screwheads, connectors,
control shafts, etc.
When the exposed metallic part has a return path to the
chassis, the reading should be between 1 MΩand
5.2 MΩ. When the exposed metal does not have a return
path to the chassis, the reading must be ∞(infinity).
Any resistance value below this range indicates an
abnormality which requires corrective action.
3. Repeat the test with the AC switch in the "OFF" position.
LEAKAGE CURRENT HOT CHECK
1.Plug the AC cord directly into adaptor socket and plug
adaptor into the AC outlet. Do not use an isolation
transformer for this check.
2. Connect a 1.5 kΩ/ 10 W resistor, paralleled by 0.15 µF
capacitor, between each exposed metallic part on the unit
and a good earth ground such as a water pipe, as shown
in Figure 1.
3.Use an AC Voltmeter, with 1 kΩ/ Volt or more sensitivity,
to measure the potential across the resistor.
4.Check all exposed metallic parts of the cover (BNC
connector, Handle bracket, Metallic cabinet, Screwheads,
Metallic overlays, etc.), and measure the voltage at each
point.
5.Reverse the AC plug in the AC plug adaptor and repeat
each of the above measurements.
6.The potential at any point should not exceed 0.75 V RMS.
A leakage current tester (SIMPSON MODEL 229 or
equivalent) may be used to make the hot checks.
Leakage current must not exceed 0.5 milliampere.
In case a measurement is outside of the limits specified,
there is a possibility of a shock hazard, and corrective
action must be taken before returning the instrument to
the customer.
AC VOLTMETER
1.5 kΩ
0.15 µFWater Pipe
(Earth Ground)
Test all exposed
metal parts
DEVICE
UNDER
TEST
AC PLUG
ADAPTOR
AC OUTLET Ground Lead Disconnected during safety check.
Fig. 1 Leakage Current Hot Check
PRODUCT COMPLIESWITH DHHS RULES 21 CFR SUBCHAPTER J
APPLICABLE AT DATE OF MANUFACTURE

CONTENTS
Major Operating Controls and Their Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Setting Up for Service of Main Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Adjustment Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Location of Test Points and Adjusting Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Schematic Diagram
Main Board (1/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Main Board (2/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Main Board (3/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Main Board (4/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Main Board (5/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Main Board (6/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Main Board (7/7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CRT Socket Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Conductor View
Main Board (Component Side View). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Main Board (Pattern Side View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CRT Socket Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Exploded View
WV-CM1480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
WV-CM1780 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
WV-CM2080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

–1 –
ON
OFF
POWER
STANDBY INPUT
SELECT
MENU –+
AUDIO
Video Monitor WV-CM 2080
q w e tyu r
AUDIO
VIDEO
OUTIN OUT
A
IN
B
IN
A
IN
B
IN
OUT OUT AC IN
S-VIDEO
G
STANDBY
ON
STANDBY
OFF
ON OFF
TERMINATION
FOCUS
DATA
PS·Data
!6 @1
!8
!5
!7
!4!3
!1 !2 !9@0
●Front View ● Rear View
* The above figures represent model WV-CM2080.
qPower Button (POWER ON/OFF)
This button turns the power of the monitor on and off.
wPower Indicator
This indicator is on when the power of the monitor is
turned on, also in standby mode.
On: Green light
Standby: Orange light
eStandby Button (STANDBY)
Pressing this button toggles the display mode on the
monitor screen as shown below.
On: Normal display
Standby (Mode 1): Low display brightness
Standby (Mode 2): No display (blackout)
rInput Selection Button (INPUT SELECT)
Selects input in the sequence shown below.
tMenu Button (MENU)
Pressing this button opens the Display Setting menu for
changing the monitor’s display settings.
Pressing this button for 5 seconds or more opens the
COMMUNICATION SETUP menu.
yDirection Buttons (C, D)
These buttons move the cursor to the item parameters
in the Display Setting and Setup menus.
C:Down
D:Up
uDecrement/Increment Buttons (AUDIO -, +)
Press these buttons to increase or decrease the audio
volume.
These buttons also select the item parameter or level in
the Display Setting and Setup menu.
!1 Focus Control (FOCUS)
This control adjusts the screen focus.
!2 Screen Control
This control is preset at the factory.
!3 Data Ports (DATA)
These ports are used to exchange control data with the
System Controller in Panasonic Security Data mode.
!4 Data Termination Selector
(TERMINATION ON/OFF)
This selector is used to enable termination of the moni-
tor’s data port.
VIDEO IN A VIDEO IN B S-VIDEO IN
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS

–2 –
!5 Standby Control Terminal
(STANDBY ON/STANDBY OFF/G)
This terminal accepts input from an outboard device to
control the standby mode.
It operates as follows:
STANDBY ON: Establishes the specified standby
mode.
STANDBY OFF: Releases standby mode (normal dis-
play).
!6 Audio Input Connectors (AUDIO IN A/B)
For audio input from an outboard device
!7 Audio Output Connectors (AUDIO OUT A/B)
The audio input signal connected to the Audio Input
Connector is looped through to this connector.
!8 S-Video Input Connector (S-VIDEO IN)
For input of S-video signal from an outboard device.
!9 Video Input Connectors (VIDEO IN A/B)
For input of composite video signal from an outboard
device.
@0 Video Output Connectors (VIDEO OUT A/B)
The video input signal connected to the Video Input
Connector is looped through to this connector and termi-
nated automatically.
@1 AC Inlet Socket (AC IN)
Plug the power cord (supplied as a standard accessory)
into this socket and connect it to an AC outlet.

–3 –
8Referring to Fig. 1, remove three screws that secure the
Bottom Cover, and remove the Bottom Cover.
Fig. 1
8Referring to Fig. 2, remove two screws that secure the
Main Board and disconnect two connectors (CN601 and
CN902).
Fig. 2
8Referring to Fig. 3, pull out the Main Board and the Resin
Chassis Ass'y until it stops while pressing the two hooks
on the bottom face.
Fig. 3
8Referring to Fig. 4, remove the Main Board while releasing
three hooks.
Fig. 4
8Mount the Resin Chassis to the Front Panel.
8Referring to Fig. 5, stand the Main Board with two stands
and groove on the Resin Chassis.
Fig. 5
SETTING UP FOR SERVICE OF MAIN BOARD
Bottom Cover
Remove three screws.
Remove two screws.
CN902
Main Board
CN601
Main Board and
Resin Chassis Ass'y
Hook
Main Board
Resin Chassis
Release
three Hooks.
Main Board
Stands
Stand
Resin Chassis
Groove (Rear View)
Main Board

–4 –
Fig. 2-2
3. Connection and Setting up for
Adjustment
3.1. Connection
8Fig. 3-1 shows the connecting diagram for adjustment of
the WV-CM1480/WV-CM1780/WV-CM2080.
Fig 3-1
8Connect the coaxial cable between Video Input Connector
of the WV-CM1480/WV-CM1780/WV-CM2080 and the
Video Output Connector of the Video Signal Generator.
8Disconnect the Modular Cable from the Data Port of the
WV-CM1480/WV-CM1780/WV-CM2080.
8The Fig. 3-2 shows the connecting diagram for the Audio
Section adjustment.
Fig 3-2
ADJUSTMENT PROCEDURE
1. Test Equipments Required
8The following Test Equipments are required for
adjustment of the Color Video Monitor WV-CM1480/WV-
CM1780/WV-CM2080.
8Video Signal Generator
Color Bar Signal
Grayscale Signal (8 stair steps)
Crosshatch Signal or Dot Signal
White Raster Signal
Red, Green and Blue each Raster Signal
8Monoscope Pattern Signal Generator
8Audio Analyzer (VP-7720 or equivalent)
8Oscilloscope
8Digital Voltmeter
8Degaussing Coil
8Ceramic Screwdriver
8Electric Torque Driver
2. Disassembling Procedure for
Adjustment
3WV-CM1480 / WV-CM1780
8Referring to Fig. 2-1, remove eight screws that secure the
Upper Cover and remove the Upper Cover.
Fig. 2-1
3WV-CM2080
8Referring to Fig. 2-2, remove thirteen screws that secure
the Upper Cover and remove the Upper Cover.
Remove eight screws.
Upper Cover
Remove thirteen screws. Upper Cover
WV-CM2080
WV-CM1480
WV-CM1780
Video Signal Generator
VIDEO IN
WV-CM1480
WV-CM1780
WV-CM2080 (Main Board)
SW1
OSC
OUT IN
AUDIO ANALYZER
AUDIO
OUT SPEAKER
OUT
8 Ω / 3 W
31
AUDIO
IN AUDIO
OUT CN601

–5 –
8Connect the Oscillator Output terminal of the Audio
Analyzer and the Audio Input Connector of the WV-
CM1480/WV-CM1780/WV-CM2080.
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-CM1480/WV-
CM1780/WV-CM2080 through selector (Audio Out or
Speaker Out) SW1.
8Terminate the Speaker Output signal with 8 Ω/3 W.
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-CM1480/WV-CM1780/WV-CM2080.
<Initial Setting>
8Turn on the power.
8Select the Direction Button (Cor D) to the NORMAL
SETTINGS position.
8Press the Increment Button (+) or Decrement Button (–),
and all the setting are initialized.
8Turn the Power Switch off.
<Service Menu>
8Turn on the power while pressing the Increment Button
(+), the Decrement Button (–) and the Menu Button
(MENU) simultaneously, and enter to the Service Mode.
8Press the Menu Button (MENU) once, and the DEF MENU
will appear on the Monitor Screen.
8The items of the DEF MENU changes as shown in Fig. 3-
3 by pressing the Direction Button (Cor D).
Fig. 3-3
8Press the Menu Button (MENU) once, and the W/B MENU
will appear on the Monitor Screen.
8The items of the W/B MENU changes as shown in Fig. 3-4
by pressing the Direction Button (Cor D).
Fig. 3-4
8Press the Menu Button (MENU) once, and the SUB MENU
will appear on the Monitor Screen.
8The items of the SUB MENU changes as shown in Fig. 3-
5 by pressing the Direction Button (Cor D).
Fig. 3-5
8Press the Menu Button (MENU) once, and the ADJ MENU
will appear on the Monitor Screen as shown in Fig. 3-6.
Fig. 3-6
1 STD BRIGHT 90
2 MAX CONTRAST 100
3 STD COLOR 60
4 STD TINT 65
5 MAX AUDIO 170
Pressing
the Direction Button (o)
Pressing
the Direction Button (i)
ADJ MENU
NTSC P-MODEL
ALL RESET NO
MENU END NO SAVE
1 CUTOFF R 0 141
2 CUTOFF G 100
3 CUTOFF B 0 166
4 DRIVE R 143
5 DRIVE B 142
6 SERVICE SW OFF
Pressing
the Direction Button (o)
Pressing
the Direction Button (i)
1 H CENTER 8
2 H SIZE 15
3 V CENTER 100
4 V SIZE 70
5 V LIN 8
6 V S 0
7 SIDE PIN 10
8 +B 45
9 MENU SIZE 45
Pressing
the Direction Button (o)
Pressing
the Direction Button (i)

–6 –
4. Adjustment Procedure
8Refer to the Location of the Test Points and
Adjusting Controls on the page 10.
(1). 120V Adjustment
Test Point: TP901 (120V) Main Board
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
8Turn on the power while pressing the Increment Button
(+), the Decrement Button (–) and the Menu Button
(MENU) simultaneously, and enter to the Service Mode.
8Supply the Grayscale signal to Video Input Connector.
8Adjust the SCREEN control so that the stair steps become
visibly certain.
8Enter to the DEF MENU by pressing the Menu Button
(MENU).
8Select +B by pressing the Direction Button (Cor D).
8Connect the Digital Multimeter to TP901.
8Adjust +B by pressing the Increment Button (+) or the
Decrement Button (–) so that the DC voltage at TP901
becomes 120 V ± 0.5 V.
(2). Screen Cut off Coarse Adjustment
Test Point: TP802 (G) CRT Board
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
SCREEN Control of Flyback Transformer
Main Board
8Supply the Grayscale signal to Video Input Connector.
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select STD BRIGHT by pressing the Direction Button (C
or D).
8Connect the Oscilloscope to TP802.
8Set the Input Selector of the Oscilloscope to the DC Mode.
8Adjust STD BRIGHT by pressing the Increment Button (+)
or the Decrement Button (–) so that G Pedestal becomes
135 V ± 2 V as shown in Fig. 4-1.
Fig. 4-1
8Adjust the SCREEN control so that only the 8th step of
stair steps becomes cut off.
(3). Contrast Adjustment
Test Point: TP802 (G) CRT Socket Board
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
8Supply the Grayscale signal to the Video Input Connector.
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select STD BRIGHT by pressing the Direction Button (C
or D).
8Note the current value of STD BRIGHT, and set STD
BRIGHT to 0by pressing the Increment Button (+) or the
Decrement Button (–).
8Select MAX CONTRAST by pressing the Direction Button
(Cor D).
8Connect the Oscilloscope to TP802.
8Set the Input Selector of the Oscilloscope to the AC Mode.
8Adjust MAX CONTRAST by pressing the Increment
Button (+) or the Decrement Button (–) so that the output
of TP802 becomes 70 V ± 3 V[p-p] as shown in Fig. 4-2.
Fig. 4-2
8Select the STD BRIGHT item by pressing the Direction
Button (Cor D).
8Set STD BRIGHT to the noted value.
(4). Centering and Size Coarse Adjustment
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Enter to the DEF MENU by pressing the Menu Button
(MENU).
8Select H CENTER by pressing the Direction Button (Cor
D).
8Adjust H CENTER by pressing the Increment Button (+) or
the Decrement Button (–) so that the screen is set to the
horizontal center position.
8Select H SIZE by pressing the Direction Button (Cor D).
8Adjust H SIZE by pressing the Increment Button (+) or the
Decrement Button (–) so that the full horizontal width
becomes approx. 8 % overscanning.
8Select SIDE PIN by pressing the Direction Button (Cor
D).
70 V ±3 V[p-p]
135 V ±2 V
GND

–7 –
8Adjust SIDE PIN by pressing the Increment Button (+) or
the Decrement Button (–) so that the vertical lines (both
right and left sides of Monoscope Pattern signal) become
straight.
8Select V CENTER ,V SIZE ,V LIN and V S by pressing the
Direction Button (Cor D).
8Adjust V CENTER ,V SIZE ,V LIN and V S by pressing the
Increment Button (+) or the Decrement Button (–) so that
the full vertical height becomes approx. 8 % overscanning.
(5). Comb Filter Adjustment
Test Point: TP803 (B) CRT Board
Adjust: VR101 (COMB-1) Main Board
L102 (COMB-2) Main Board
8Supply the Color Bar signal to the Video Input Connector.
8Connect the terminated Oscilloscope with 75 Ωto TP803.
8Adjust VR101 and L102 by turns so that the 3.58 MHz
component becomes minimum as shown in Fig. 4-3.
Fig. 4-3
(6). Tint Adjustment
Test Point: TP803 (B) CRT Board
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
8Supply the Color Bar signal to the Video Input Connector.
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select STD TINT and STD COLOR by pressing the
Direction Button (Cor D).
8Connect the terminated Oscilloscope with 75 Ωto TP803.
8Adjust STD TINT and STD COLOR by pressing the
Increment Button (+) or the Decrement Button (–) so that
the waveform becomes flat as shown in Fig. 4-4.
Fig. 4-4
(7). Color Adjustment
Test Point: TP803 (B) CRT Board
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
8Supply the Color Bar signal to the Video Input Connector.
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select STD COLOR by pressing the Direction Button (C
or D).
8Connect the terminated Oscilloscope with 75 Ωto TP803.
8Adjust STD COLOR by pressing the Increment Button (+)
or the Decrement Button (–) so that the output of TP803
becomes 40 V ± 2 V[p-p]as shown in Fig. 4-5.
Fig. 4-5
(8). Character Size Adjustment
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Video Monitor Screen
8Enter to the DEF MENU by pressing the Menu Button
(MENU).
8Select MENU SIZE by pressing the Direction Button (Cor
D).
8Adjust MENU SIZE by pressing the Increment Button (+)
or the Decrement Button (–) so that the both right and left
sides of the White Rectangle on the Monitor Screen
become same width as shown in Fig. 4-6.
Fig. 4-6
40 V ±2 V[p-p]
GOODNO GOOD
Waveform
becomes flat.
DEF
9. MENU SIZE 45
White Rectangle
These widths become same.

–8 –
(9). Audio Maximum Output Level Adjustment
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Audio Analyzer
8Supply the Color Bar signal to the Video Input Connector.
8Set the Selector (Audio Out or Speaker Out) SW1 to the
Speaker Out position.
8Set the Output Level and the Oscillation Frequency of the
Audio Analyzer to –14 dBV ± 0.3 dBV, 1 kHz.
(Input level to WV-CM1480/WV-CM1780/WV-CM2080 will
be –8.0 dBV ± 0.3 dBV)
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select MAX AUDIO by pressing the Direction Button (C
or D).
8Adjust MAX AUDIO by pressing the Increment Button (+)
or the Decrement Button (–) so that the output level
becomes 7.4 dBV ± 0.5 dBV on the Audio Analyzer.
(10). Screen Cut off Fine Adjustment
Adjust: SCREEN Control of Flyback Transformer
Main Board
Observe: Video Monitor Screen
8Supply the Grayscale signal to the Video Input Connector.
8Adjust the SCREEN control so that the 8th step of the stair
step becomes cut off.
(11). Purity Adjustment
Adjust: Purity Magnet
Deflection Coil
Observe: Video Monitor Screen
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. 4-7
8Supply the Red Raster 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. 4-8.
Fig. 4-8
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 color fully
occupies the entire screen and tighten the screws that
secure the deflection coil.
Note: For WV-CM1480/WV-CM1780, do not adjust two
variable resistors and magnets on the Deflection
Coil as shown in Fig. 4-9.
Fig. 4-9
Deflection coil fixing screw
Purity magnet
Convergence magnet-1
Convergence magnet-2
Deflection coil
Magnets
Variable Resistors
RED RED

–9 –
(12). Convergence Adjustment
Adjust: Convergence magnet-1
Convergence magnet-2
Observe: Video Monitor Screen
8Supply the Crosshatch 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: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Video Monitor Screen
8Supply the White Raster signal to the Video Input
Connector.
8Enter to the W/B MENU by pressing the Menu Button
(MENU).
8Select CUTOFF R, CUTOFF B, DRIVE R or DRIVE B by
pressing the Direction Button (Cor D).
8Adjust CUTOFF R, CUTOFF B, DRIVE R or DRIVE B by
pressing the Increment Button (+) or the Decrement
Button (–) so that the raster on the CRT Screen becomes
White.
(14). Centering and Size Fine Adjustment
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Video Monitor Screen
8Supply the Monoscope Pattern signal to the Video Input
Connector.
8Enter to the DEF MENU by pressing the Menu Button
(MENU).
8Select H CENTER by pressing the Direction Button (Cor
D).
8Adjust H CENTER by pressing the Increment Button (+) or
the Decrement Button (–) so that the screen is set to the
horizontal center position.
8Select H SIZE by pressing the Direction Button (Cor D).
8Adjust H SIZE by pressing the Increment Button (+) or the
Decrement Button (–) so that the full horizontal width
becomes 8 % ± 2 % overscanning.
8Select V CENTER by pressing the Direction Button (Cor
D).
8Adjust V CENTER by pressing the Increment Button (+) or
the Decrement Button (–) so that the Monoscope Pattern
signal positions at the vertical center on the Monitor
screen.
8Select V SIZE by pressing the Direction Button (Cor D).
8Adjust V SIZE by pressing the Increment Button (+) or the
Decrement Button (–) so that the full vertical height
becomes 8 % ± 2 % overscanning.
8Repeat adjusting H CENTER, H SIZE, V CENTER and V
SIZE until they are satisfied.
8Select SIDE PIN by pressing the Direction Button (Cor
D).
8Adjust SIDE PIN by pressing the Increment Button (+) or
the Decrement Button (–) so that the vertical lines (both
right and left sides of Monoscope Pattern signal) become
straight.
(15). Focus Adjustment
Adjust: FOCUS control of Flyback Transformer
Main Board
Observe: Video Monitor Screen
8Supply the Crosshatch signal or the Dot signal to the
Video Input Connector.
8Adjust the FOCUS control for the best focus.
(16). Sub Bright Adjustment
Adjust: Increment Button (+) Front Panel
Decrement Button (–) Front Panel
Observe: Video Monitor Screen
8Supply the Grayscale signal to the Video Input Connector.
8Isolate the Monitor Screen from the outside light source.
8Enter to the SUB MENU by pressing the Menu Button
(MENU).
8Select STD BRIGHT by pressing the Direction Button (C
or D).
8Adjust STD BRIGHT by pressing the Increment Button (+)
or the Decrement Button (–) so that only the 8th step
becomes cut off.

–10 –
MAIN BOARD
(COMPONENT SIDE) CRT SOCKET BOARD
(COMPONENT SIDE)
TP901
(120V)
TP502 (FBT)
R918
TP802 (G)TP801 (R)TP803 (B)
FOCUS
SCREEN
MENU
+ –
FRONT SIDE
REAR SIDE
L102
(COMB-2)
VR101
(COMB-1)
(NTSC only)
LOCATION OF TEST POINTS AND ADJUSTING CONTROLS

–11 –
CN807
1
5
1
6
CN804
CN809
CN806
CN803
CRT
SOCKET
CN808
GRAY
(SCREEN)
WHITE
(FOCUS)
T502 T502
FLYBACK
TRANSFORMER
G3
G2
JK901
AC INLET
SOCKET
E904
(WV-CM1480:VM142L03)
(WV-CM1780:VM142L03)
(WV-CM2080:K4EP13C00001)
E2
(WV-CM1480:VM1480L04A)
(WV-CM1780:K4DJD0000020)
(WV-CM2080:K4EP17000001)
E501
(WV-CM1480:VM142L02)
(WV-CM1780:VM142L02)
(WV-CM2080:K1PA04D00001)
E201
(WV-CM1480:VM142L01)
(WV-CM1780:VM142L01)
(WV-CM2080:K1PA07D00001)
E
E4
(YWVM1910L09)
RED
(ANODE)
E904
(E501)
15
CN401
L1
DEFLECTION
COIL
L2 DEGAUSSING COIL
CRT1
CATHODE RAY TUBE
14
CN601
(E201)
1
1
3
7
CN902
1
2
SP1
SPEAKER
E3
(VM1020L05A)
MAIN BOARD
CRT SOCKET BOARD
WIRING DIAGRAM

AUDIO ACH
AUDIO BCH
VIDEO ACH
VIDEO BCH
STANDBY
ON/OFF
FA/CTRL
DATA IN
DATA OUT
MAIN BOARD
IN1B
IN1A
IN2B
IN2A
IN3B
IN3A
OUT1
CTL1
1
16
14
11
9
8
OUT2
CTL2
OUT3
CTL3
IC101
SELECTOR
Q119 Q107,L102
L103 VR101
VR101
COMB-1
L103
COMB-2
NTSC ONLY
S-VIDEO
(AUDIO BCH)
AUDIO
AMP
512
67
COMB FILTER Q108-Q111 C122,C123,L108
Q112-Q115 Q117
Q118
IC102
AMP CHROMA
B.P.F. 37
1
2
AMP L110 BUFFER KILLER OUT
CHROMA IN
EXT VIDEO IN
INT VIDEO IN
HOR VCO
R OUT
G OUT
B OUT
VIDEO OUT
54
Y IN
VER SYNC IN
HOR SYNC IN
AFC1
YS IN
EXT.R IN
EXT.G IN
EXT.B IN
SDA
SCL
SDA
SCL
VER PULSE OUT
SANDCASTLE PULSE OUT
AMP/MIX
Q125 IC201
PICTURE CONTROL
PAL ONLY
PAL ONLY
PAL ONLY
PAL ONLY
NTSC ONLY
57
14
16
2
5
7
R
G
B
8
60
61
15
16
17
–(B–Y) OUT
–(R–Y) OUT
–(B–Y) IN
–(R–Y) IN
48
31
38
36
43
45
46
53
10
11
12
13
58
62
21
22
Q217Q702,703
AMP Q101,Q701
IC301 MICROPROCESSOR
AMP
A/B OUT SYNC IN
SIG OUT
AFC SELECT
OSD(Y/BL)
OSD(B)
VD IN
VD IN
HD IN
RESET
OSC2
OSC1
SDA
SCL
POWER OFF IN
AUDIO ADJ
BUZZER OUT
CRT/SP MUTE
STANDBY LED
MENU SIZE ADJ
V CENTER ADJ
NT/PAL
V/S OUT
ALM IN
RECOVER IN
FA
LINE CHECK(PSD)
CTL(PSD)
XIN
XOUT
BUFFER Q216 Q215
Q205
BUFFER SYNC
Q301
Q201
Q213
Q211
Q214
Q208 BUFFER
BUFFER
Q207
BUFFER
VCO
(4.34 MHz)
VCO
(3.58 MHz)
PAL
PAL
NTSC
X201
X202
IC202
CHROMA DIFFERENCE
NTSC
PAL ONLY
Q103 Q105
Q106
AMP
31
24Q102
AMP
L101 BUFFER
B-Y IN
R-Y IN
B-Y OUT
R-Y OUT
Q209
TO
CRT BOARD
. . . . . . CN804
E201
D208
D207
IC601
POWER AMP
D206
AMP
SAND
Q210
AMP
OUT
GND
MUTE AIN
28
3
4
6
MUTE
VR
FEEDBACK
POWER OFF
AUDIO ADJ
BUZZER
IN
+13.5V
12
ACL
20
ACL
HOR PULSE OUT
FBP IN
56
50 FBP IN
5SAND
4
3
2
V+
V–
H–
CN401
1
2
3
AUDIO
GND
GND
SP1
SPEAKER
CN601
Q204
D205
D204
Q203
Q602
Q202
IC203
VOLTAGE
DETECTOR
3
Q601
L1
DEFLECTION COIL
6
5
4
3
STANDBY ON
STANDBY ON
STANDBY OFF
STANDBY OFF
E301 Q308
Q307
SW310
2
3
4
5
RX(B)
RX(A)
TX(B)
TX(A)
CN302
2
3
4
5
RX(B)
RX(A)
TX(B)
TX(A)
CN303
4
3
1
FA
SDA
SCL
CN301
IC305
TRANSCEIVER
IC306(a)
MONOSTABLE
MULTIVIBRATOR
851
3.58M TRAP 29
30
3
36
356
38
37
47
43
42
14
9
48
49
54
52
45
46
10
AMP
AMP
SDA
4
B2
RXD
TXD D0-D7 1-8 20-27 D0-D7(UART)
RD
WR
C/D 17
INT
RESET
RD(UART)
WR(UART)
C/D(UART)
INT(UART)
RESET(UART)
STANDBY SW
VIDEO SEL SW
MENU SW
UP SW
DOWN SW
–SW
+SW
+B ADJ
13
+5V
REGULATOR
X2
X1
A2 9
12
11 #Q2
Q2
7
6
7
6
22
9
10
11
23
13
14
1
4
3
1
SCL
IC304
TRANSCEIVER
IC307
UART
X302
X301
19
18
17
11
58
59
60
61
62
63
2
STANDBY
STANDBY
STANDBY
SW301
SW302
SW303
SW304
SW305
SW306
SW307
INPUT
SELECT
MENU
INPUT
INPUT
MENU
MENU
––
++
–
+
IN
GND
OUT
+9V
1
2
IC303
VOLTAGE
DETECTOR
IC302
EEPROM
Q302(a)
NTSC
Q912,D921
+9V
REGULATOR
+5V
REGULATOR
IC901
Q908
Q909,D911
H.DRIVER
Q501,Q502,T501
Q503,Q504
IC401
V.DRIVER CONTROL
+12V
REGULATOR
IC403
Q910 D917 D406
PAL
Q302(b)
D305
STANDBY
3
SDA
SDA
5
6SCL
56
55
4 POWER OFF
AUDIO ADJ
BUZZER
MUTE
EW DRIVER
SCL
12
7
28
31
15
40
+9V
2
3
1
+9V
TP901
(120V)
Q901-Q906,
D902-D909
D919,D920
F901
23
1
TH901
L903
L904
F902
AC IN
L2
DEGAUSSING COIL
CN902
D901
JK901
AC INLET
SOCKET
SW901
POWER
BUTTON
SWITCHING
REGULATOR
L
NE
AC
AC
3
1+13.5V
+5VA
+9V
+5V
+12V
D918
D913
D914
Q911
+
–
120V
SDA
VD 13
984 2
10 2
V TRIG IN
SDA
SCL
V.DRIVE
EW DRIVE
SCL
OUTIN
IC402
V.DRIVER
Q401,Q402
V.CENTER
ADJ
D506
T502
FLYBACK TRANSFORMER
11
12
10
6
4
7
1
2
3
5
8
FOCUS
SCREEN
FOCUS
SCREEN
HV
D505
D517
D507
180V
HEATER
FBP IN
ACL
Q506
D514
D513
D520
D518
D516D515D512D509 D511
D508
D519
+
–
+
–
–+
+
–
1H+
H
V
Q801
Q803
Q802
DRIVER
DRIVER
DRIVER
CN807
E501
E904
1
3
5
1
3
5
180V
HEATER
+9V
CRT1
CATHODE
RAY TUBE
CRT SOCKET BOARD
CN804
TO
MAIN BOARD
. . . . . . . . E201
CN803
2
4
6
R
G
B
CN809
1
GND
CN806 1
SCREEN
CN808
1 GND
–+
–+
32
5
15
12
11
63
64
VD
SAND
180V
HEATER
+9V
AOUT
– 12 –
BLOCK DIAGRAM

CN101,CN102
VIDEO
INPUT/OUTPUT
CONNECTORS
VIDEO
JK101
AUDIO
INPUT/OUTPUT
CONNECTORS
JK103
S-VIDEO
INPUT
CONNECTOR
AUDIO
S-VIDEO
IN
VIDEO
SWITCH
IN
A
OUT
IN
B
OUT
IN
A
OUT
IN
B
OUT
VIDEO/AUDIO SWITCH
C126
WV-CM1480 : 56P
WV-CM1780 : 56P
WV-CM2080 : 47P
C127
WV-CM1480 : 68P
WV-CM1780 : 68P
WV-CM2080 : 100P
TO
MAIN
BOARD
(2/7)
(Page 14)
TO
MAIN
BOARD
(5/7)
(Page 17)
TO
MAIN
BOARD
(3/7)
(Page 15)
FROM
MAIN
BOARD
(6/7)
(Page 18)
VR101
COMB-1
L102
COMB-2
OPEN
< INDEX >
MAIN BOARD (1/7)
IC101 D2
IC102 A3
Q102 A2
Q103 B2
Q105 B3
Q106 A2
Q107 B4
Q108 A5
Q109 A5
Q110 A5
Q111 A6
Q112 C4
Q113 C4
Q114 C5
Q115 C5
Q117 C6
Q118 D6
Q119 B4
Q113 C4
Q114 C5
Q115 C5
Q117 C6
Q118 D6
Q119 B4
D101 D2
D102 C2
D103 B1
D104 B1
D107 A1
D108 B2
R103 1K
D102
R105
1K
R107
100
C105
47/25
1K
C103
1/50
D103
R106 C104
1/50
D104
CN102
JK101(2/2)
JK101(1/2)
R101 1K
R102
75
R104
75
CN101
IC101
C101
1/50
C102
1/50
D101
C163 OPEN
C162 OPEN
Q103
R118
22K
R117
47K
R116
100
R114
75
R115
75
R126
1K
R127
22K
R129
22K
R128
Q102
22K
C110
R119
2.2K
R123
1K
C112
D107
0.01
Q106
C113
D108
R131
10K
1K
R130
L101
C135 0.01
0.01
JK103
R120
OPEN
R124
1K
R125
2.2K
Q105
R144
0
C134
10/50
C115
1/50
R134 390
VR101
500
R133 1K R132 220
R165 OPEN
Q107
L104 68
C116 56P
R135 390
C117
82P
R137
680
R136
1.2K
R138
680
R139
680
L103
L102
C138 OPEN
L105
22
Q108
R152
680
R150
2.2K
R166
681
R168
OPEN
C122 68P
L108 27
R153
R151
1K
C123
180P
R154 470
L107 15
C118
68P
Q109
R155
1.8K
R156 390
R157
OPEN
C119 180P
C120
OPEN
Q110
Q111
R159 1.2K R158
1K
R160
5.6K
R161 4.7K
R162 100
R163 2.2K
Q112
R171
680
C150
R169
2.2K
R172
680
R170
1K
R173
510
L109
15
C124
68P
Q113
R174
2.2K
C131
10/50 R141 0 R140 180
C151 L112
Q125
R143
C132
10P
C133
100P
L111
18 R191
10K
R142
Q118
R190
5.6K
TRAP
C139
0.01
C152
R175 390
R176
330
C126
C127 Q114
Q115
R178
1.5K
R177
1.8K
R179
6.2K
R180
4.7K
R181
100
R182
1K
C128
33/35
C125
180/25
L106
27
C130
180/25
C121 0.01
Q119
R194 1K
R192 22KR193 22K
R195 R186
1K
R187
1K
R188
1K
R189
220
Q117
L110
IC102
C136 0.01
R145 220
C155 0.01 C142 0.01
2
4
3
5
1
2
4
3
5
1
6
5
4
3
2
1
1
2
3
4
5
6
7
8
15
14
13
12
11
10
9
IN1B
CTL1
OUT1
GND2
OUT3
CTL3
IN3A
16
IN1A
IN3B
GND1
IN2B
V+
CTL2
IN2A
GND3
OUT2
-+
C140
180/25
C141
0.01
-
+
-
+
-+
-+
-+
-
-
+
+
-+
123456789
242822212719182616152513
101112
1
23 4
13
7
68 4
213
24
C114
180/25
123456789
242822212719182616152513
1011 12
1IN1
2SW
3IN2
4
8
VSS
7
OUT
6
VDD
5
+9V
+9V
+9V +9V
+9V
+9V
+9V
A/B
V/S
CHROMA
AUDIO
Y
Y
+9V
+9V
+9V
(JUMPER)
-+
-
+
-
+
-
+
-
+
-
+
NC NC
+9V
10/50
4.6
5.1
3.9
2.3
2.1
4.7
3.0
3.5
9.0
1.1
1.8
0
0.7
4.7
4.7
4.6
3.9
9.0
5.2
4.6
2.9
4.6
3.0
9.0
5.1
2.7
2.8
9.0
0
6.2
2.8 2.8 3.4
4.4
9.0 9.0
1.3
1.9
3.8
4.4
3.9
3.3
3.4
5.2
5.2
9.0
4.6
6.3
3.4 3.4 3.5
4.1
4.9 9.0
4.3
4.9
2.8
2.7
4.6
10 µs/DIV, 0.2 V/DIV
10 µs/DIV, 0.2 V/DIV
10 µs/DIV, 0.1 V/DIV
10 µs/DIV, 0.2 V/DIV
MAIN BOARD (1/7)
1 2 3 4 56
A
B
C
D
∗
∗
∗∗
Important safety notice
Components Identified by " " mark have special characteristics for safety.
When replacing any of these components, use only manufacturer's specified parts.
–13 –
SCHEMATIC DIAGRAM OF MAIN BOARD (1/7)

B–Y AMP.R–Y AMP.
SYNC SEPARATOR
1H DELAY
OPEN
VERTICAL
DRIVER
AFC
DRIVER
HORIZONTAL
DRIVER
FROM
MAIN
BOARD
(1/7)
(Page 13)
TO
MAIN
BOARD
(7/7)
(Page 19)
TO
MAIN
BOARD
(3/7)
(Page 15)
TO
MAIN
BOARD
(5/7)
(Page 17)
IC201(1/3) SINGNAL PROCESSOR
∗C702
WV-CM1480 : OPEN
WV-CM1780 : OPEN
WV-CM2080 : 22P
< INDEX >
MAIN BOARD (2/7)
Q101 B2
Q201 A6
Q208 C5
Q209 C3
Q210 C3
Q211 C4
Q213 D5
Q214 C5
Q216 B3
Q217 B3
Q701 B1
Q702 A2
Q703 A2
D106 B2IC201 B5
DVDD
NC
DVSS
I.C.
SAND
NC
I.C. I.C.
R–Y IN
AVDD NC B-Y IN NC B–Y OUT R–Y OUT
AVSS
12345
R203
X201
(3.579545 MHz)
33K
R202
OPEN
6 7 8 9 10 11 12 13
64 63 62 61 60 59 58 57 56 55 54 53 52
C245
C244
C246 C247
R201
270K
C204
0.1
R204
7.5K C207
2.2/50
C208
12P
X201
C251
Q208
1000P
3.3K
R240
X202
C243
C242
Q702
Q703
∗C702
R707 1K
C704
OPEN R711
OPEN
C201
0.068
C202
0.068
C203
0.068
C206
0.022
Q210
R253
4.7K
R259
4.7K
R258
5.6K
C236
100/10
Q209
R255
10K
IC202
8 7 6 5 4 3 2 1
9
10 11 12 13 14 15 16
0.01 220K
R266
1K
R267
3.3K
R265 C248
R205
OPEN
R206
R208
330
R207
680
0
R278 Q217
Q216
100
R269
4.7K
R268
1K
R260
3.3K
R262
1.3K
R257
2.2K
R256
1.3K
R254
3.3K
R261
10K
C107
R110
0.1
0
Q701
Q101
D106
Q213
HD
3.58M TRAP
VD
OSD(B)
OSD(Y/BL)
Q214
J299
TRAP
SYNC
(JUMPER)
C235
100P
C237
100P
C205
0.1
R706
1.2K
R704
2.2K
R705
5.6K
R279
1.5K
R703
12K
C701
33/35
R709
68K
R708
3.3K
R710
12K
L113
1
2
4
3Y
R252 12K
0.1C252
C232 0.022 C233 R251
C250
1000P
2.2K
R272 100K
C231 0.022
C238 0.1
C239 0.1
10/50
(15.625 KHz) C234
220P
Q211
R702
1.5K
OPEN
R112
150K
R111
15K
C108
100
R701
Y
R276
10K
R113
3.3K
+9V(A)
+9V(A)
+9V(A)
+9V(A)
+9V(A)
+5V
SYNC
BC
E
BC
E
BC
4 5 6
3 2 1
E
R–Y CLAMP YS IN EXT. R IN EXT. G IN EXT. B IN
VER.PULSE
OUT
HOR.PULSE
OUT
G–Y CLAMP B–Y CLAMP
KILLER FILTER KILLER OUT CHROMA APC VCO (4.43 MHz) VCO (3.58 MHz) SPOT KILLER
AFC2 AFC1
HOR.VCO
X-RAY
PROTECT IN
50/60Hz
DET OUT
SECAM
INTERFACE
–(B–Y) OUT
–(R–Y) OUT
SANDCASTLE
PULSE OUT
–(B–Y) IN
–(R–Y) IN
Q201
H PULSE
AFC SEL
EXT VIDEO
Y OUT
+5V
+9V(A)
+5V
+9V(A) +9V(A)
+5V +5V
C109
1/50
-+
-
+
-+
-+
-+
C703
100/10
-
+
-+
-
+
5.0
6.8 2.5
1.9
9.0
9.0
8.73.2
9.0
3.8
1.4 2.1
3.9
3.2
3.9 9.0
3.0
2.4
6.7
2.5
1.9
4.9
0.6 0.7 4.7 -2.7
4.0 0.2
0.1
0
0
0
9.0
4.7
0.9
0.3
MAIN BOARD (2/7)
123
A
B
C
D
56
4
FROM
MAIN
BOARD
(6/7)
(Page 18)
+5V
+9V(A)
–14 –
SCHEMATIC DIAGRAM OF MAIN BOARD (2/7)

MUTE
CONTROL
DRIVER
VIDEO
MUTE
DRIVER
AUIDO
MUTE
DRIVER
AUDIO
CONTROL
DRIVER
BUZZER
OUTPUT
DRIVER
SP1
SPEAKER
TO
CRT
SOCKET
BOARD
CN809
TO
CRT
SOCKET
BOARD
CN804
FROM
MAIN
BOARD
(2/7)
(Page 14)
FROM
MAIN
BOARD
(1/7)
(Page 13)
TO
MAIN BOARD
(5/7)
(Page 17)
TO
MAIN BOARD
(7/7)
(Page 19)
IC201(2/3) SIGNAL PROCESSOR IC201(2/3) SIGNAL PROCESSOR
AUIDO OUTPUT CONTROLLER
MUTE RESET
FROM
MAIN
BOARD
(6/7)
(Page 18)
D201 A2
D202 A5
D203 A5
D204 B5
D205 B5
D206 C6
D207 C6
D208 C6
D601 D6
D602 D6
Q202 B5
Q203 B5
Q204 B5
Q205 C3
Q207 D3
Q215 C2
Q601 C5
Q602 C4
< INDEX >
MAIN BOARD (3/7)
IC201 B2,B4
IC203 A5
IC601 D5
R OUT G OUT B OUT VCC1 SDA SCL EXT VIDEO IN
FBP IN
VCC2
GND
VCC3-2
HOR.SYNC.
IN
VER.SYNC.
IN
VER.SYNC.
CLAMP
HOR.LOCK DET GND ACL VCC3 VIF1 IN VIF2 IN GND RF AGC OUT AUDIO OUT DEEMPHASIS AFT OUT DC DECOUPLING EXT AUDIO IN
SIF IN/DAC OUT
IF AGC
VIDEO OUT
SIF APC
INT VIDEO IN
VIF DET
OUT
VIF APC1
VIF VCO
BLACK
LEVEL
Y IN
CHROMA IN
1
3
GND
GND
E904
AUDIO
B
GND
R
G
GND
GND
6 5 4
1 3 2
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37
EXT VIDEO
FBP
ACL
CTRL
36 35 34 33
1VCC 1 2A IN 3MUTE 4VR 6FEEDBACK 7GND 8A OUT 9VCC 2 5CONST
1
2
3
1
2
4
5
6
7
1
1
2
3
4
5
6
Q207
C219
10/50 R229
2.2K
C221
100P
R227
330
R228
C220
180/25
R226
1K
180
R225
100
Q205
C209
0.01
C210
470/16
R212 1.5K R213 1.5K
R215
470 470
R216
470
R217
OPEN
OPEN
C213 R271
R270 47K
R214 1.5K
R209
1M
R210
D201
100 100
R211
SCL
SDA
C211
0.022
C212
0.022
C229 47/25
R237
10K
C227
180/25
C233
680P
R223
680K
C222 2.2/50
R232
180K
R230
2.2K
R231
OPEN
C218
4.7/50
C226
1000P
R239
330 2W
C225
0.1
R234
220
C224
1/50
R277
390
R238
10K
R236
220
R273 47K
R235
510
C228
0.1
C230 0.1
C610
10/50
R613
330
R618
100K
R615
C612 C609
C608 1/50
C606
100/10
C607 3300P
R610
R603
10K
100
1W
4.7/50
1000/16
C611
0.047 4.7
1/2W
R611
10K
R224
680K
C253
0.01
1IN 2
OUT
3
GND
IC203
C255 C254
0.01 0.01
IC601
D601D602
CN601
SP1
(8 ohms)
E201
+5V
CHROMA
YOUTEXT VIDEO
D202
D203 R220
C217 R222
R223
10K
150K
47/25
47K
R219
10K
R218
15K
C215
0.1
C216
0.1
AUDIO
ADJ
CTRL
POWER OFF
INT VIDEO
CRT/SP
MUTE
BUZZER
R221 470
Q202
BC
E
Q204
D204
D205
BC
E
Q203
BC
E
Q601
R614 C613
330/25
R617
100K
12K
BC
E
D206
D207
D208
R609
AUDIO
2.2K
R616
12
Q602
BC
E
R274
10K
R275
10K
Q215
+9V(A)
+9V(A)
+5V
+13.5V +9V(A)
+9V(A)
+13.5V
+9V(A)
R
G
B
+9V
+13.5V
R
G
B
-+
-+
-+
-+
10/50C214
-+
-
+
-
+
-
+
-
+
-+
-
+
-+ -+
-+
-+
-+
-+
C615
1/50
-+
1/4W
+5V
+9V
+9V(A)
+13.5V
5.5
9.0
7.1
7.7
5.4
5.4 4.7 6.0
5.5
0.1
0.1
0
0
4.3
3.6
5.3 4.9
0.1
0
0.2 5.2 5.3 5.3
11.5
3.5 8.0
0
0.3
10 µs/DIV, 0.1 V/DIV
10 µs/DIV, 0.2 V/DIV
MAIN BOARD (3/7)
1 2 3 4 56
A
B
C
D
10 µs/DIV, 1 V/DIV 10 µs/DIV, 1 V/DIV10 µs/DIV, 1 V/DIV
Important safety notice
Components Identified by " " mark have special characteristics for safety. When replacing any of these components, use only manufacturer's specified parts.
–15 –
SCHEMATIC DIAGRAM OF MAIN BOARD (3/7)

DATA
E301
STANDBY
CONTROL
TERMINAL
CN302,CN303
DATA
PORTS
STANDBY CONTROL AMP.
LINE DRIVER
SW310
DATA
TERMINATION
SELECTOR
SW301
STANDBY
BUTTON
SW303
MENU
BUTTON
SW304,305
DIRECTION
BUTTONS
SW306,307
DECREMENT/INCREMENT
BUTTONS
SW302
INPUT
SELECTION
BUTTON
TERMINATION
MONOSTABLE
MULTIVIBRATOR
MENU
SYSTEM
RESET
AUDIOAUDIO
INPUT
SELECT
STANDBY
TO
MAIN
BOARD
(5/7)
(Page 17)
FROM
MAIN
BOARD
(6/7)
(Page 18)
(IN)
(OUT)
< INDEX >
MAIN BOARD (4/7)
IC303 C5
IC304 B3
IC305 B3
IC306 A2
IC307 B5
Q307 C2
Q308 C2
D301 C4
D302 C4
D303 C4
D316 C1
D317 C1
D341 B2
D342 B2
D343 A2
D344 A2
IC307 UART
X302
(9.83MHz)
R381
1M
R382 33K R383 33K
CN301
C309
1000/10
SW304 SW306 SW307
VBR
VBS
RESET
UART
R324
10K
C311
0.01
SW303
R315 100
R316 100
R317 100
C308
1
R318
82
2W
D303 D302
D301
IC303
C310
0.01
E301
SW305
R366
1K
R365
1K
C331
0.01
C332
0.01
R372 10K
R373
10K
R374
4.7K
4.7K
Q308
C335
47/25
D317
D316
SW301 SW302
R301 R302
1K10K 1K10K
1K10K
1K
10K
1K
10K
1K
10K
1K
10K
R309
R312
SW310 ON
OFF
R303 R304
C302
R305 R306
C303
R307 R308
C304
R310
C305
R311
C306 C307
SW
R313 R314
C301
1000P 1000P 1000P 1000P 1000P 1000P 1000P
C350
1000/10
R370 10K
R369
10K
R371
Q307 L342 2.2
IC304
IC305
IC306
CF301
CN302
CN303
VS302 VS303
VS301
VS304
D341 D342
D343 D344
R398
150 1W
R384
R385
R399 15K
15K
15K
15K
15K
15K
15K
R386
R388
R389
R387
R392
15K
R390 15K
C348 0.1
C349 0.1
C347
C344 0.1
C346 100P
C345 100P
100P
C343
0.1
R391 180K
R393 15K
R396
2.2K
R397
2.2K
C341
0.1
C342
220/10
12 11 10 9 8 7 6 5 4 3 2 1
13 14 15 16 17 18 19 20 21 22 23 24 D0
D1 D2 D3 D4 D5 D6 D7
RD
WR
C/D
D0 D1 D2 D3 D4 D5 D6 D7
RD
WR
C/D
GNDX2
X1 RESET
RES INT
CS INT P1 P0 RTS CTS RXD TXD VCC
21212121212121
1IN 2
OUT
3
GND
5
6
7
8
4
3
2
1
5
6
7
8
4
3
2
1
1
2
3
4
5
6
79 10
11
12
13
14
8
15
16
1
2
3
45
6
7
8
9
10
1
2
3
4
+9V
+5V(A)
+9V
1
2
3
4
5
6
+5V(A)
GND
CX1/RX1
RST
A1 A2B1 B2Q1 Q2Q1
GND Q2
VCC
RST2
CX2/RX2
GND
1
2
3
4
5
6
1
2
3
4
5
6
FA
SCL
SDA
GND
STANDBY OFF
STANDBY ON
G
GND
RX(B)
RX(A)
TX(A)
TX(B)
GND
GND
RX(B)
RX(A)
TX(A)
TX(B)
GND
VBR
FA
SDA
FA/CTRL
STBY ON/OFF
SCL
-
+
-
+
RECOVER
ALM
TXD
PSD
CTL
RXD
TXD
RXD
LINE CHECK
-
+
-
+
MENU
UP
DOWN
INPUT
STANDBY
+
–
5.5 5.5
0
5.5
5.5
0
0.5
3.8
2.3
2.3
4.9
3.6
1.1
4.9
4.9
4.9
0.7
0.8
0.5
4.8
4.8
4.8
3.8
5.5
0
5.55.5
5.5 5.5 5.5
5.5
5.0 4.9 5.0 5.0 4.9 4.5 4.7 4.8
5.5 5.5
0
5.5
0
4.8 5.5 2.4
MAIN BOARD (4/7)
1 2 3 4 56
A
B
C
D
Important safety notice
Components Identified by " " mark have special characteristics for safety.
When replacing any of these components, use only manufacturer's specified parts.
–16 –
SCHEMATIC DIAGRAM OF MAIN BOARD (4/7)