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Service Manual
ORDER NO.AVS8903175C8
Video Monitor
WV-BM90:'
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . ._.. . . . . . . 1 CHIP COMPONENTS . . . . . . . . . . 16
MAJOR OPERATING CONTROLS AND WIRINGDIAGRAM ................................ 18
THEIRFUNCTIONS .................................. 2 BLOCK DIAGRAM
CONECTION . . . . . . . . . ._ . . . . . . . . . . . . . . 4 MAIN BOARD/SWITCH BOARDNOLUME BOARD . 19
OPERATING PROCEDURE . . . . . _. . . . . . . . . _. _. . . . 5 CONTROL BOARD/CONTROL SUB BOARD . 20
CIRCUIT DESCRIPTION CONDUCTOR VIEW
l.MainBoard ................................... 7 MAIN BOARD/SWITCH BOARDNOLUME BOARD 26
2.Control Board _. _. . _. . . . . . _. _ _. _. . . . 7 CONTROL BOARD/CONTROL SUB BOARD . . . . . 24
ADJUSTMENT PROCEDURE . . . . . . . . . . . . _. . 11 SCHEMATIC DIAGRAM
APPEARANCE OF IC, TRANSISTER AND DIODE . . . . . 14 MAIN BOARD/SWITCH BOARDNOLUME BOARD 25
LOCATION OF TEST POINTS AND CONTROL BOARD/CONTROL SUB BOARD . . . . 21
A D J U S T I N G C O N T R O L S __........_______._......_.. 15 EXPLODED VIEW OF WV-BM90 . . . . . . . 27
REPLACEMENT PARTS LIST _. . . . . _. . _. _. . . 28
Panasonic Matsushita Electric Industrial Co., Ltd,. -I,-
Central P.O. Box 288, Osaka 530-91, Japan
This symbol warns the user that uninsulated voltage
within the unit may have suificient magnitude to
cause electric shock. Therefore, it is dangerous to
make any kind of contact with any inside part of
_.
-CAUTION TO "EDUCE TUE RI% CIF ELEC
TRIG SHOCK DO NOT AEMO'JE
- to"En ,OR BACK NO USER * This symbol alerts the user that important literature
SERVICEABLE PARTS INSlDE
FIEFEEI SEAVICING TO CIVALI concerning the operation and maintenance of this
FIED SERVICL PERSONNEL unit has been included.
/ Therefore, it should be read carefully in order to
avoid any problems.
IMPORTANT SAFETY NOTICE
There are special components used in this equipment which are important for safety. These parts
are indicated by" A " mark on the schematic diagram and the replacement parts list. It is essential
that these critical parts should be replaced with manufacture's specified parts to prevent shock,
fire, or other hazards.
Do not modify the original design without permission of manUfaCtUre.
\
SPECIFICATIONS
0 Video Monitor WV-BM90
Power Supply : 24OV AC 50Hz for WV-BMSOIA and WV-BMSO/B
220V AC 50Hz for WV-BMSO/C, WV-BMSOIG and WV-BM90lF
Power Consumption : Approx.65W
Camera Input : 1 .OVp-p/75 ohms, composite x 4 (BNC)
Video Input : l.OVp-p/75 ohms, composite x 1 (BNC)
Video Output : l.OVp-p/75 ohms, composite x 1 (BNC)
Power Supply for Camera : Regulated current multiplex method
Camera Switching : Manual/Auto (Sequence) With auto and manual bypass
Sequential Switching Interval : Adjustable; 1 to 30 sec.
Resolution (Horizontal) : 750 lines at center
Sweep Linearity : V: Less than 7%
H: Less than 5%
External Control Connection Terminal : SPOT MONITOR CONTROL IN x 4
RECOVER IN x 1
ALARM CONTROL OUT x 2
REMOTE OUT x 4
RESET OUT x 1
Camera Extension Input : 10 pin connector
Alarm Time : Adjustable: 2 to 30 sec.
Dimensions : 230 (W) x 240 (H) x 270 (D) m m
Weight : 4.2kg
OPTIONAL ACCESSORIES
o Optional Accessory for WV-BM90
o Camera Extension Unit WV-83
- l-
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS
VIDEO MONITOR WV-BM90
1 Power Switch (POWER) Contrast Control (CONTRAST)
This is a push type switch which turns the monitor ON and Turn this control clockwise to increase the picture
OFF. contrast.
Push once and the switch remains down ( a ) for turning
on the monitor and cameras, Time Adjustment (TIME ADJ, MIN/MAX)
Sequence and camera number indicator lamps light. The sequential switching interval can be manually ad-
Push again, the switch comes up ( 1 ) for turning off the justed from 1 to 30 seconds by turning this knob.
monitor and cameras, and the lamps go off.
Sequence Switch (SEQUENCE)
2 Mode Selection Switch (MODE STANDBY/ON)
This is a push-push type switch which selects the cameras
This selects the condition of the monitor as; in sequential switching mode when the switch is pushed
ON: and its lamp lights. The switching interval can be adjusted
The picture of the camera will appear on the monitor. by Time Adjustment (6) from 1 to 30 seconds.
STANDBY:
Camera Selection Switches
The picture of the camera will not appear on the monitor
These are push-push type switches which select the de-
in the sequence mode, however the picture signal is
sired camera to observe picture and the lamp of the se-
provided at Video Output Connector (IO).
lected channel lights. When one of these switches is
The picture of desired camera can be observed by
pushed on, the sequence switch goes off if the sequence
selecting Camera Selection Switch (6).
switch has been turned ON.
3 I n p u t SelectionSwitch(lNPUTSELECTEXT/CAMERA)
Bypass Selection Switches (BYPASS/AUTO)
This selects the condition of the monitor as;
These select the condition of the monitor as;
EXT:
BY PASS:
VTR playback picture connected to Video Input Con-
The picture of the connected camera will be skipped.
nector can be observed.
AUTO:
CAMERA:
The channel(s) with no camera connection will be au-
Camera picture connected to Camera Input Connector
tomatically skipped.
can be observed.
4 Bright Control (BRIGHT)
Turn this control clockwise to increase the picture
brightness.
-2-
10 Camera Input Connectors (CAMERA INPUT) 16 External Timing Input Connector (EXT IN)
The BNC type connectors are used to accept the coaxial This is an input connector for the external timing
cables from the specified cameras. from the time lapse VTR or another Mini CCTV Syst
These connectors supply the DC power and vertical drive
pulse.to the cameras, and receive the video signal from 17 Camera Extension Input Connector - .
the cameras. (CAMERA EXTENSION IN)
Note: This is a IO-pin connector for the Camera Extensi,
WV-63 for expanding the system up to 7 cameras 2
l Be sure to connect only the specified cameras.
informations are as;
l Connect the camera after making sure that the monitor
Pin 1: Video Input Signal
is off.
Pin 2: VD Output Signal
If the camera is connected while the monitor is on,
the camera will not be functioned by activating the Pin 3: Ground
protection circuit for misconnection. Pin 4: Logic Signal for Sequence
Pin 5: Logic Signal for Sequence
11 Video Output Connector (VIDEO OUT) Pin 6: Logic Signal for Sequence
The BNC type connector is used to provide the video Pin 7: Logic Signal for Sequence
output signal of the camera for the additional,monitor Pin 0: Logic Signal for Sequence
or video tape recorder.
Pin 9: Logic Signal for Sequence
The video output signal of the camera is provided at this
Pin IO: Logic Signal for Sequence
connector even if the Mode Selection Switch (2) is set to
the STANDBY position,
18 Camera Extension Switch
12 Video`lnput Connector (VIDEO IN) (CAMERA EXTENSION, ON/OFF)
This selects the condition of camera extension fc
This is an video input connector from a VTR for observing
as;
the playback picture.
ON:
When the KfR playback picture is to be shown on the
Camera pictures connected to the Camera Extl
video monitor, set the Input Selection Switch (3) to the
Unit WV-63 can be observed on the monitor.
EXT position and Mode Selection Switch (2) to the ON
position. OFF:
Select this position whenever the Camera Exh
13 Timing Output Connector (TIMING OUT) Unit WV-63 is not connected.
This output connector provides the timing pulse signals 19 Vertical Hold Control (V.HOLD)
for switching in the sequence operation for other system Locks in the picture of the monitor vertically.
such as another Mini CCTV System or sequential switcher.
20 Auto Reset Switch (AUTO RESET, ON/OFF)
14 Power Cord This selects the condition of auto reset function as,
ON:
15 Timing Selection Switch (TIMING SELECT INT/EXT) The automatic reset function performs and the
The timing pulses for the sequential switching interval can matic reset time is set to approx. 60 seconds
be selected as; OFF:
INT: The automatic reset function is disabled.
The timing pulses for the sequential switching interval
are generated in the video monitor WV-BMSO. 21 Alarm Time Adjustment (ALARM TIME ADJ)
EXT:
The alarm time can be manually adjustable by turnir
The timing pulse for the sequential switching interval control.
are synchronized with the external timing pulses fed to The alarm time can be set from 2 to 30 seconds (1 se
the External Timing Input Connector (16) from the time step).
lapse VTR or another Mini CClV System.
. --_
1 _..I_
-3-
22 External Control Connection Terminal The power rate of the alarm should be up to DC 24V, max.
(SPOT MONITOR CONTROL IN/RECOVER IN/ALARM 1 OOmA.
CONTROL OUT/REMOTE OUT) If the power capacity of the remote is less than 1 OOmA at
. SPOT MONITOR CONTROL IN DC 24V, the remote load can be connected at the terminal
The terminals of the Spot Monitor Control In are used of Remote directly. - .
to connect the intercom or alarm sensors for the spot If the power capacity of the alarm is more than 1 OOmA at
DC 24V, the relay circuit should be used for the remote
monitoring by making a short circuit of terminal 1,2, 3 or 4.
When the Camera Extension Unit is used, the spot moni- load.
toring is proceeded for terminal 5, 6 and 7 of the camera
CONNECTIONS
extension unit.
If the terminal 1 is shorted by intercom or alarm sensors,
Cautions:
the camera No.1 is selected and its picture is observed on
the monitor. 1. Keep the Power Switch of the monitor, optional Camera
The picture of the camera No.2, 3 or 4 (5, 6 or 7 when the Extensron Unit and optional Remote Control Unrt in the
Camera Extension Unit is used.) can be observed in the OFF position during connectlon.
same manner. If the power of these units are ON during connection, the
Note: camera will not function due to the protection circuit for
misconnection.
The voltage of short circuit for the terminal should be 0 -
2. Connect only the specified cameras WV-BL90 or WV-71,
0.2 volt when the intercom or alarm sensor is activated.
If other type of camera is connected, the Mini camera
. system will not perform due to the protection circuit for
l RECOVER I N
wrong camera.
To reset the spot monitor picture of the desired camera
and back to the sequence operation, supply the reset
signal from the time lapse VTR to this terminal.
l ALARM CONTROL OUT
The terminals of the Alarm Control Out are used to connect
the buzzer or chime for sounding when the terminals of
the Spot Monitor Control In is (are) shorted by intercom or
alarm sensor.
ALL MODE-GND Connection
The connected buzzer or chime will sound at both
positions of the Mode Selection Switch (2) when the
intercom or alarm is activated.
STANDBY-GND Connection
The connected buzzer or chime will sound when the
Mode Selection Switch (2) is positioned at STANDBY
and the intercom or alarm is activated,
l REMOTE OUT Connection
The terminals for the Remote Out are used to connect the
Spot Monitor Control In on another monitor for the Spot
Monitoring by short circuit of terminal 1,2,3 or 4 when the
two video monitors are connected,
The RESET out terminal is used to connect the RECOVER
input terminal on another monitor.
The terminals for the Remote Out are also used to connect
the Remote In terminals on the panning control by short
circuit of terminal 1, 2, 3 or 4 when the video monitor
is connected with Remote Control Unit for Auto Panning
Head.
-4-
OPERATING PROCEDURE
SELECTION OF CAMERA Note:
Set the Power Switch (POWER) on the front panel to the The sequential switching features the automatic by- -
ON position by pushing once. pass circuit by detecting the presence of the DC power ' e_
The switch remains down ( A ) keeping the monitor and for the camera so that the input connector with no
camera ON, and green lamps for sequence and channel(s) camera connection is automatically skipped.
which the Camera(s) is/are connected light ON approx.
4 seconds for you to confirm how many cameras are
connected.
Push the Camera Selection Switch for selecting the de-
sired camera's picture and green lamp lights.
Note:
1. The desired camera's picture can be seen on the mon-
itor by pushing the Camera Selection Switch at the
sequence mode.
l STANDBY MODE - MONITORING PICTURE
2. also, the desired camera's picture can be seen on the
monitor by pushing the Camera Selection Switch. 1. Set the Power Switch (POWER) on the front panel to the
Caution: ON position by pushing once.
When the power switch of monitor is turned ON and
The switch remains down ( a ) keeping the monitor and
camera ON, and green lamps for sequence and channel(s)
OFF repeatedly in the short period of time, the camera
which the Camera(s) is/are connected light ON approx.
may not be turned ON due to the operation of miscon-
nection protection circuit. 4 seconds for you to confirm how many cameras are
In this case, leave the switch in the OFF position for a connected.
few seconds before turning it ON again. 2. Set the Mode Selection Switch (MODE) to the ON position.
3. Push the Sequence Switch (SEQUENCE) to be sequential
SEQUENCE MODE (More than two cameras) switching.
4. Adjust the Time Adjustment (TIME ADJ) to be desired se-
Set the Power Switch (POWER) on the front panel to the
ON position by pushing once.
quential switching interval (from 1 to 30 seconds).
5. Set the Mode Selection Switch (MODE) to the STANDBY
The switch remains down ( II ) keeping the monitor and
position. The picture on the monitor will disappear, how-
camera ON, and green lamps for sequence and channel(s)
ever the sequential switching is actually being carried and
which the Camera(s) is/are connected light ON approx.
the picture can be observed on the additional monitor
4 seconds for you to confirm how many cameras are
connected to the Video Output Connector.
connected.
6. When the picture of the desired camera is ob-
Set the Mode Selection Switch (MODE) to the ON position.
served/monitored, push the button of Camera Selection
Push the Sequence Switch (SEQUENCE) to be sequential Switch for the desired camera and green lamp lights.
switching and green lamp lights. 7. By pushing the Sequence Switch (SEQUENCE) again, the
Adjust the Time Adjustment (TIME ADJ) to be desired se- picture on the monitor will disappear and back to the
quential switching interval (from 1 to 30 seconds). sequential switching in the STANDBY mode.
PV"Ver Mode Input Bright contrast Time sequence Camera Selection
Swtch Select& Selection Control Control Adjustment Switch Switches
Switch Switch I
Green
Lamp
~ Bypass Selection Swtches . *. "-_
*_
-5-
. PRIORITY OF SPOT MONITOR CONTROL IN 3. Time Lapse VTR
. The selection of the camera by Spot Monitor Control In is When the Time Lapse VTR is connected with Mini CCN
set as first come, first served. System, the selection of the camera by alarm sen-
. The Camera Selection Switch has a first priority against sors/intercom is automatically reset after reset time set
any selectional signal. by the Time Lapse VTR and the selection of the camera is
returned to the sequential switching.
. VTR PLAYBACK MODE
Set the Power Switch (POWER) on the front panel to the
ON position by pushing once.
The switch remains down ( a ) keeping the monitor and
camera ON, and green lamps for sequence and channel(s)
which the Camera(s) is/are connected light ON approx.
4 seconds for you to confirm how many cameras are
connected.
2. Set the Mode Selection Switch (MODE) to the ON position.
3. Set the Input Selection Switch (INPUT SELECT
EXT/CAMERA) to EXT position for observing the playback
picture.
AUTOMATIC RESET SELECTION SWITCH FOR SPOT
MONITOR CONTROL INPUT
The monitor has the built-in automatic reset circuit which is
automatically reset the spot monitor control input signals
such as intercom, alarm sensors etc. at approx. 60
seconds after input signal is received.
The automatic reset circuit is functioned according to the
spot monitor control input signals as;
1. Alarm Senssrs Signal
The selection of the camera by the alarm sensors sig-
nal is automatically reset after approx. 60 seconds and
the selection of the camera is returned to the sequential
switching.
2. Intercom Signal
(a) Intercom Communication
The selection of the camera by the intercom signal is being
held during intercom communication and will be reset for
the sequential switching after the intercom communication
has been over.
(b) Intercom Calling
The selection of the camera by intercom calling signal
only is automatically reset after approx. 60 seconds and
the selection of the camera is returned to the sequential
switching.
-6-
CIRCUIT DESCRIPTION R5. The divided DC voltage is supplied through operation
amplifier ICl (a) to base of impedance converter 471 for
1. Main Board controlling the camera DC power to steady state.
The variation of load current due to coaxial cable length is
detected by R6 and R7 as a voltage change and the changed 1,.
l - l Power Circuit
voltage is supplied to operation amplifier ICl (a) which _
compensates the voltage differences between pins 2 and 3 of
This circuit generates the regulated + 5V DC, + 12V DC and
ICl. Therefore, even if the cable length is changed, current
+ 24V DC from 22OV/240 AC.
fed to detecting resistors R6 and R7 is kept constant and the
constant current is supplied to the camera.
1-2 Video Amplifier Circuit
l Misconnection Protection Circuit
The composite video signal fed to base of 46 from control
The video signal from the camera is multiplexed on the
board through pin 1 of CN3.
power line, the rnisconnection protection circuit protects the
The video signal from the emitter of 96 IS fed through VR8
power circuit from a open or short circuit.
(CONTRAST), amplifier Q7,Q8 and Q9 to cathode of CRT.
When the power switch on the video monitor is turned ON,
Ql is turned ON at beginning and low potential at collector
1-3 H.V Deflection Circuit
of Ql issupplied to pin 2 of operation amplifier ICl (a).
At this time, approx. + 22V DC set from + 24V DC by dividing
This circuit generates vertical (V) deflectlon sawthooth
with D2, VRl and R3 - R5 and supphed to pin 3 of ICI (a) is
current for V scanning of the beam inside the cathode ray
compared with the potential at pin 2 so that the output at
tube (CRT) and horizontal (H) deflection sawthooth current
pin 1 of ICl supplied to base of impedance converter 471 is
for horizontal scanning of the beam inside the cathode ray
high level and Q71 is kept OFF.
tube.
At the same time, 43 is turned ON momentarily and approx.
+4V DC set by zenner diode Dl is supplied through Q3, R8
1-4 High Voltage Circuit
and Dl to the camera. In the camera, approx. 40KHz pulse is
generated by the +4V DC and multiplexed on the power line.
This circuit generates high voltages for cathode ray tube
This pulse is supplied to Q2 for turning it ON and Q? OFF.
(CRT) electrodes.
Due to Ql OFF, collector potential is increased and thus the
The flyback pulse generated by horizontal (H) deflection
output of ICl (a) is decreased therefore, the impedance
circuit is supplied to the primary winding of the flyback
converter 471 is turned ON and converts the impedance of
transformer (FBT) in high voltage pack T3 to step up the
power line from high to low. As a result, the DC power is
flyback pulse to the necessary level. The boosted pulses
supplied from the constant current circuit continuously
obtained at the secondary winding of the transformer are
through 471.
rectified to generate high voltages.
While camera power circuit supplies constant current to the
camera, voltage difference appears at both end of R6 and R7
so that the Ql is turned ON and Ql(CONTROL SUB BOARD) is
2. Control Board
kept OFF.
If this video monitor is connected to other CCTV cameras or
2-1 Camera Power Circuit
products, no pulse is fed back to the starter circuit and Ql
(CONTROL SUB BOARD) is kept ON. Therefore, no DC power
The video monitor WV-EM90 has four camera power circuit
is supplied to the connected products in order to protect
which supply the DC power to the specified cameras through
them.
the coaxial cable respectively. Since these four circuits are
When the coaxial cable is disconnected in the operating
exactly same, the power supply circuit for camera-l will be
condition, no current is fed through R6 and R7, voltage drop
described.
of R6 and R7 reduces and Ql is turned OFF. As a result, Ql on
This circuit consists of a constant current circuit, and a
the Control sub board is turned ON and potential at pin 2 of
misconnectlon protection circuit.
ICl (a) decreases, pin 1 of ICl (a) is increased and 471 is
turned OFF. In this way, the no DC power is supplied to the
0 Constant Current Circuit
power line.
In order to compensate the difference of voltage drop due to
the coaxial cable length between the video monitor and
camera, this circuit applies the constant current to the camera
regardlessof coaxial cable length.
+ 24V DC supplied from Main board through at pin 8 of El is
divided by zener diode D2, VRl (DC CURRENT ADJ) and R3 -
T
IC6. When the input selection switch 5~3 on the VR board is
2-2 Video Processing Circuit set to CAMERA posltlon, pin 53 of IC6 sends low level to 427
a n d Q29 for turning ON 427 and t u r n i n g O F F Q2R.
2-2-l Camera Detection Circuit Therefore camera video signal is selected and supplied to
Main board. When SW3 is set to EXT position, high level is 1..
This circuit detects whether camera is connected or not. This sent to 427 and Q28 and composite video signal externally
monitor has four camera detection circuits and these four enters to the video monitor is supplied to Main board.
circuits are exactly same, so that the camera detection crrcurt The video output circuit consisting of 430 - 431 amplifies
for camera-l will be described. the camera video signal for setting it to specified signal level
When the camera WV-BL90 is connected to camera-l I N and compensates the frequency response. This signal is
connector CNlOl and power switch of the vrdeo monitor is supplied to VIDEO OUTPUT connector.
turned ON, approx. + 12V DC is supplied from the camera
power circuit to the connected camera. At this time, + 12V 2-3 Remote Control Circuit
DC is also supplied to 44 for turning It OFF and Q5 OFF. The H
level at collector of Q5 is supplied to pin 7 of IC6 and lC6 This circuit supplies the camera selection signal and reset
recognizes that camera-l is connected. signal to the remote control unit WV-32 for auto panning
When camera is not connected to the video monitor or the head or another video monitor for remote control.
coaxial cable is disconnected in the operating condition, no This circuit also supplres the alarm signal to the additionally
DC power is supplied to power line since misconnection connected buzzer or chime.
protection circuit functions. At this trme, both Q4 and Q5 are
turned ON, pin 7 of lC6 becomes L level and IC6 recognizes 0 Camera Remote Output Circuit
that camera-l is not connected. When the camera-l is selected by sequence control for
example, pin 2 of microprocessor IC6 becomes low (L) level
2-2-2 Camera Selection Circuit during the sequence time set by VR9 (TIME ADJ) on the
Volume board. This signal IS supplied through C64 and RI 16
This circuit selects the camera signal which is supplied to to 454 and both 454 and 455 are turned ON at the decay
signal processing circuit for observing the selected prcture on timing of signal and negative trigger obtained at collector
the monitor. Four camera selection circutts are existed on the 455 is supplied to connected unit.
monitor and are exactly same, so that the camera-l will be On the other hand, when the camera-l is selected by spot
described. monitor control for example, pin 2 of IC6 becomes L level
When camera-l is selected by sequence mode or spot during camera-l button is depressed and the L level is
monitoring mode, pin 2 of IC6 becomes L level and the L level supplied to Q54 for turning both 454 and 455 ON and
is fed to Q6 to turn ON Q6. Therefore the camera-l signal negative trigger obtained at collector Q55 is also supplied to
obtained at Pin 3 of 46 is supplied to signal processing circuit. connected unit for selecting camera-l.
The remote output circuit for the camera-2, camera-3 and
2-2-3 Signal Processing Circuit camera-4 functions as same manner as camera-l remote
output circuit.
The video signal from the camera-l supplied to Q6 on the
control board is mixed with the VD pulse which is sent l Remote Reset Output Circuit
through VD pulse generator Q12/Q13 and inverter 45 and When sequence button is depressed while the video monrtor
supplied to the camera for vertical synchronization. is operated at spot monitor mode, pin 22 of IC6 becomes L
The vrdeo srgnal with VD pulse is supplied through 96 to level during the button is depressed. This signal is supplred to
clamp circuit Q20. 462 for turning both Q62 and Q63 ON and the negative
In the clamp circuit, horizontal (H) and vertical (V) blanking signal/pulse obtained at collector 463 is supplied to
periods of video signal is clamped by the clamp pulse which is connected products through reset terminal.
generated by sync separator Q19 and clamp pulse generator
consisting of ICl (a) - (d). l Alarm Standby Output Circuit
The video signal is sent to VD erase circuit Q21 where the While the video monitor is operated at standby mode and
Vsync is added and VD pulse is removed by the VDE pulse. spot monitor control signal IS fed to the spot monitor control
This signal is supplied to slicer consisting of Q22 - 424 where terminal, pin 54 of IC6 becomes L level. This is sent to Q51 to
low level of sync signal is clipped and the sync level is set to turn both 451 and QSO ON and the negative signal/pulse
0.3vp-p. obtained at collector Q50 is supplied through standby alarm , . . a-_
._
The video INT/EXT switching circurt consisting of 426 - Q29 output teimin'al to connected buzzer or chime to ring it.
selects either composite video signal entering VIDEO INPUT At this time, correspond camera signal is selected and
connector or camera video signal swrtched by microprocessor observed on the monitor screen.
-a-
2-4 External Spot Control Circuit a Reset Control Circuit
When the recover terminal is grounded externally, 433 is
The external spot control circuit contains camera1 -4 select turned ON and key matrix for sequence control of IC6 is
circuits, busy control circuit and reset control circuit. achieved and the system is changed from spot monitoring
mode to sequence mode. ^, .
0 Camera Select Circuit
When the spot monitor control 1 terminal is grounded for 2-5 LED Drive Circuit
example, 435 is changed from ON to OFF and H level at the
collector is supplied to pin 44 of IC6 for selecting the camera- When this monitor is operated in the sequence mode, pin 6 of
1 signal and the picture of camera-l can be seen on the video IC6 becomes L level. It is supplied to 449 for turning it ON
monitor. and H level at collector of 449 is supplied to sequence
The camera-2, camera-3 and camera-4 select function same as indicating LED 1 on the Switch board to light the LED. At this
camera-l select. time, pins 2,3,4 and 5 of IC6 becomes L level sequentially and
supplied to respective swrtching transistors 445, 446, Q47
l Busy Control Circuit and 448 to turn them ON and the camera1 - 4 (LED 2 - 5) on
(In case Intercom system is used with this system) the Switch board is lit.
When the two-wire intercom system is used with this system, When this monitor operates at the spot monitoring mode,
the wires connected between a master unit and branch unit pin 6 of IC6 becomes H level and sequence LED is turned OFF.
are also connected to the spot monitor control input 1 - 4 and Since one of pins 41 - 44 of IC6 become L level, one of pins 2-
the ground terminal respectively. In this system if the call 5 of IC6 is L level, respective LED drive transistors (445 - 448)
button on the branch unit for spot monitor control input 1 is is turned ON, and LED of selected camera is lit.
depressed, the potential at the base of 435 becomes L level
for turning 435 OFF. As a result, H level at collector is 2-6 System Control Circuit
supplied to pin 44 of IC6 and the picture of camera-l can be
seen on the video monrtor. All function of this monitor such as camera select, mode
At the same time, automatic reset circuit in microprocessor select are controlled by the microprocessor 1C6.
IC6 starts functioning, determines the automatic reset time at When the power switch of video monitor is turned ON, + 5V
60 seconds and reset to the sequence mode to spot monitor DC is supplied to pin 33 of IC6. At the beginning, generated
control. + 5V DC is fed to pin 1 of reset pulse generator IC7 and reset
However, the spot monitoring mode set by pressing the call pulse obtained at pin 3 of IC7 is fed to pin 17 of IC6 for setting
button on the branch unit of intercom system should not be the IC6 to initial condition.
reset to the sequence mode during conversation. During the The pin identification and functions of the microprocessor IC6
conversation, the call button is released and approx. + 6V DC is described in the table.
(it should be less the + 12V DC) is fed through D16 to Q34 for
turning 434 ON.
Therefore the pin 39 of IC6 is kept L level and the sequential
circurt in IC6 i s n o t r e s e t a u t o m a t i c a l l y d u r i n g t h e
conversation using intercom system.
If the phone is put down after finishing the conversation, the
potential fed to 434 becomes approx. 0.3V DC and Q34 is
turned OFF. As a result, H potential is fed to pin 39 of lC6 and
the sequential circuit in IC6 is reset to the sequence mode.
(In caseTime lapse VTR is used with this system)
The time lapse VTR is used with this system, alarm control
output terminal and recover input terminal are connected to
the VTR. When the alarm signal is fed to the VTR, it starts
recording. At this time, H potential is provided at recover
terminal from the VTR and the H level is turns both Q32 and
434 ON. As a result, L level at collector of 434 is supplied to
pin 39 of IC6 for inhibiting the automatic reset circuit in KS to . *. --_
4 I_
keep the video monitor on the spot monitoring mode while
the VTR is in recording mode.
-9-
KS MN1 554CCLl
Pin Identification
Pin No. Name IN/OUT Description
1 v s s - Ground
2 PO0 _ IN/OUT Camera-l Select/LED/Remote Control
3 PO1 IN/OUT Camera-2 Select/LED/Remote Control
4 PO2 IN/OUT Camera-3 Select/LED/Remote Control
5 PO3 IN/OUT Camera-4 Select/LED/Remote Control
6 PC2 OUT Sequence LED Output
7 PlO IN/OUT Camera-l Power Select/Detection
8 Pll IN/OUT Camera-2 Power Select/Detection
9 P12 IN/OUT Camera-3 Power Select/Detection
10 P13 IN/OUT Camera-4 Power Select/Detection
11 SYNC - Not Used
12 SIRQ IN Reset Signal Input
13 IRQ IN V. Sync Input
14 SBT - Not Used
15 SBO - Not Used
16 SBI - Not Used
17 RST IN Rest In
18 P20 IN/OUT Adapter Voltage Detection
19 P21 - Not used
20 P22 - Not used
21 P23 IN/OUT Discharge pulse
22 P30 IN/OUT Remote control recover
23 P31 IN/OUT Extension Select 1
24 P32 IN/OUT Timing
25 P33 IN/OUT Standby
26 P40 OUT Key scan output-l Alarm Time D/A output
27 P41 OUT Key scan output-2 Alarm Time D/A output
28 P42 OUT Key scan output-3 Alarm Time D/A output
29 P43 OUT Key scan output-4 Alarm Time D/A output
30 P50 OUT Auto
31 P51 OUT V sync output
32 P52 OUT VD output
33 vDD IN VDD
34 PC0 OUT Rest output output
35 PC1 OUT Clock output
36 P53 OUT Ring Counter output
37 P60 IN Ring Counter input-2
38 P61 IN Ring Counter input-l
39 P62 IN Busy control
40 P63 IN Recover Input
41 P70 IN Camera-4 InterphoneISensor Input
42 P71 IN Camera-3 Interphone / Sensor Input
43 P72 IN Camera-2 Interphone /Sensor Input
44 P73 IN Camera-l Interphone /Sensor Input
45 P80 IN/OUT Sequence time
46 P81 IN/OUT Alarm time control
47 P82 IN/OUT External Timing Pulse Input
48 P83 IN/OUT EIAICCIR select
49 P90 IN/OUT Key scan -1
50 P91 IN/OUT Key scan -3
51 P92 IN/OUT Key scan-2
52 P93 IN/OUT
53 PA0 OUT IN/EXT Video Select Output
54 PA1 OUT Alarm standby output
55 PA2 OUT Alarm all mode output
56 PA3 - Not used
57 PBO - Not used
58 PBl - Not used
59 PB2 - Not used
60 PB3 - Not used
61 osc2 OUT Clock Pulse Generator
. . . --_
62 OSCl IN Clock Pulse Generator . I_
63 XI IN Ground
64 x0 - Not Used
- 10 -
ADJUSTMENT PROCEDURE 3 CRT REPLACEMENT
1 TEST EQUIPMENT REQUIRED . Remove the cover as previously described in section 2.
l Remove two screws holding the front chassis and slide
The following equipment is required for adjustment of WV- back the chassis wrth PCB unit.
BM90. l Disconnect the anode cap. -, .
Caution : Make sure that the anode voltage is
0 Oscilloscope completely discharged by directly connected
0 Digital Voltmeter between anode terminal and chassis.
0 Completely aligned Black and Whrte Camera WV-EL90
0 Frequency Counter
0 Resolution Chart (YWV1400RB99)
N A T I O N A L FhIEMMIiC
RemovG+two screws
RESOLUTION CHART Fig.3-1
Fig. l-1 . Remove two screws holding the Control board assembly
and open the direction of the arrow.
2 DISASSEMBLY PROCEDURE FOR
ADJUSTMENT
. Remove six screws holding the cover and remove the
cover by pulling it backward.
Remove six screws
Fig. 3-2
. Disconnect the CRT socket by pulling it backward.
. Loosen the screw holding deflection yoke and
convergence magnets assy and remove the yoke and
magnets assembly by pulling them backward.
Deflection holding screw
Fig. 2-1
CRT Sock.et
/
Fig. 3-3
.
5 ADJUSTMENT
Remove four screws holding CRT and remove CRT.
Remove four screws (1) 12V adjustment
Test Point : TP2 (12V) Main board : *
Adjust : VRl (12V ADJ) Main board
. Disconnect all cameras from the Camera input connectors
1,2,3 and 4 on the rear panel.
. Turn ON the power switch.
. Connect the digital voltmeter to TP2.
l Adjust VRl (12V ADJ) for 12V 2 O.lV.
(2) DC current adjustment
Fig. 3-4 Adjust : VRl (DC CURRENT) Control board
Observe : DC current meter
Connect the DC current meter between the video camera
4 CONNECTION AND SETTING UP FOR WV-BL90 and CAMERA INPUT 1 connector of Video
Monitor WV-BM90.
ADJUSTMENT
l Turn ON the power switch.
Adjust VRl (DC CURRENTADJ) for 22OmA t 7mA.
l Confirm that the DC current of CAMERA INPUT
. Connect the coaxial cable between the VIDEO OUTPUT connectors 2,3 and 4.
terminal of BNV Camera WV-BL90 and CAMERA INPUT
connector 1,2,3 or 4 of Video Monitor WV-BM90.
(3) H hold, V hold coarse adjustment
Video Monitor Adjusts : VR2 (SUB BRIGHT) Main board
u
WV-EM90 Main board
VR5 (H. HOLD)
VRll (V. HOLD) Control board
000000
l Set the controls and switches on the volume board and
I
7
I
Control board as follows.
:( Mode Selection switch : ON position
Approx. 1.7ft (0.5m) Input Selection switch : EXT position
Contrast Control : Mechanical Center position
Bright Control : Mechanical Center position
Vertical hold control : Mechanical Center position
Horizontal hold control : Mechanical Center position
. Connect the completely aligned video camera WV-BL90
to CAMERA INPUT connector 1.2.3 or 4 of Video Monitor
WV-BM90.
Aim the camera atthe resolution chart (YWV1400RB99).
Turn ON the power switch.
Adjust the VR2 (SUB BRIGHT) so that the raster will just
appear.
Adjust VRl l(V.HOLD) and VR5(H.HOLD) so that the circle -
of the resolution chart on the Monitor screen becomes `. Ia
center position.
- 12 -
(9) Focus fine adjustment
(4) Picture tilt adjustment
Adjust : Deflection coil Adjust : VR6 (FOCUS) Main board
0 Loosen the deflection coil holding screw. 0 Adjust VR6 (FOCUS) for best focus in the monitor.
0 Turn the deflection coil until the raster on the monitor -, .
screen is straight. _
0 Carefullytighten the deflection coil holding screw.
(5) Centering adjustment
Adjust : Centering magnets
LE (H. WIDTH) Main board
0 Adjust the centering magnets until the raster comes to
the center of monitor screen becomes true circle.
0 Adjust L8 (H. WIDTH) so that the circle of the resolution
chart on the Monitor screen.
(6) Vertical height and linearity adjustment
Adjust : VR4 (V.LIN) Main board
VR3 (V. HEIGHT) Main board
0 Adjust VR3 (V. HEIGHT) and V. LIN VR4 so that the circle in
the chart is nearly a true circle.
(7) Sub-brightness adjustment
Adjust : VR2 (SUB BRIGHT) Main board
0 Set the controls on the volume board as follows.
Contrast Control : Fully counter clockwise
Bright Control : Mechanical Center position
0 Turn VR2 (SU8 BRIGHT) fully clockwise and then turn it
back so that the raster will just go out.
0 Turn VR8 (CONTRAST) at mechanical center position.
(8) H hold, V hold fine adjustment
Adjust : VRS (H.HOLD) Main board
VRll (V. HOLD) Control board
0 Disconnect all cameras from the camera input connector
1,2,3 and 4.
0 Connect the frequency counter to pin 2 (Yellow wire) of
deflection coil and adjust the VR5 (H HOLD) on the Main
board for 158KHz f 50Hz.
0 Connect the frequency counter to Pin 3 (Red wire) of
deflection coil and adjust the VRll(V HOLD) on the
control board for 47.3Hz 2 0.5Hz.
. . . --_
I_
- 13 -
APPEARANCE OF IC, TRANSISTOR AND DIODE
NJU74HCU04M NJM2903M MN1 554CCLl NPC1379C AN6554NS LQV3M9280G
AN6554NS
NJM78L09A AN78N05 2SA1018 2SD973-QRS 2SD601 -QRS UN2217
M51951ASL 2SD662-PQR 2SB709-QRS MA1 51 K
2SD636-QRS 2SC2404CD MA1 53Tw
2SB641 -QRS 2SB710-QRS
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