WJ-AV20 - Panasonic Provideo Service Manual (repair manual)

ORDER NO. AVS0003247C8

WJ-AV20

C

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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 .

●

Power supply :

220 - 240 V AC, 50 Hz

Power consumption :

13 W max.

Weight :

4 k

g

Dimensions :

420 (W) 

×

44 (H) 

×

350 (D) mm (no rubber feet and bosses included)

Applicable line :

ISDN BRI dial-up (1B/2B)

Video input :

Video input 1 - 5, composite / 1 V[p-p]/75 

Ω

BNC

Note) Video input 1 is for combination camera control signal multiplexed.

Local output :

Composite, 1 V[p-p]/75 

Ω

, BNC, selected video input to be output.

Video output :

Monitor 1 (menu provided), 2 (No menu provided), composite,
1 V[p-p]/75 

Ω

, BNC

Image compression system :

H.263/H.261 (automatic selection) 
No. of processed picture elements CIF: 352 

×

288 max. 15 fps

Audio input/output :

Audio input 

×

1, audio output 

×

1, RCA pin jack: –10 dB

Audio compression system :

G.728 (/G.711): audio band 3.4kHz, G.722: audio band 7 kHz, or no sound

●

Data port* :

4-wire RS-485, RJ-11 connector, baud rate = 4 800 bps/ 9 600 bps,
Data length = 7-bit/8-bit
Stop = 1-bit/2-bit, parity = NONE/ODD/EVEN

Parel port :

D-Sub 25-pin female, Input 

× 

8 (make-contact),

Output 

×

8 (open collector output)

Forced (line) disconnection input 

× 

1 (make-contact)

Clock adjust signal input 

× 

1 (make-contact)

Mid-communication output 

× 

1 (open collector output)

Parel data strobe output 

× 

1 (open collector output), +12 V output (50 mA max.)

Sensor input/trigger output :

D-Sub 25-pin female, sensor input 

× 

8 (make-contact)

Trigger output 

× 

8 (open collector output)

Host port :

RS-232C (D-Sub 9-pin male) or 4-wire RS-485 (RJ-11 connector),
Rate = 4 800/9 600/19 200 bps, data length = 8-bit (fixed),
Stop = 1-bit (fixed), Parity = NONE
Note) RS-232C fixed or RS232C/RS485 changeover by DCD signal (Set with dip switch-
es on the rear)

* Daisy chain not permissible.

AV Codec WJ-AV

20

REMOTE

RING.VOL

POWER

ON

OFF

LINE
   1

LINE
   2

WJ-AV20

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.

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 SERVICEING TO QUALIFIED SERVICE
PERSONNEL.

This symbol warns the user that uninsuland 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 impotant literature concerning 
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 "  " 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.

●

Remote control connector :

Rear: RJ-11 modular port, front: mini-DIN 5-conductor jack

ISDN terminating switch :

100 

Ω

termination ON/OFF

Host port, data port

RS-485 terminating SW :

ON/OFF (Set with dip switches on the rear)

Data port RS485 line changeover SW :

Straight/crossover (Set with dip switches on the rear)

Note 1: Mutual connections with Codec by other firms are not guaranteed.
Note 2: In case of no ISDN, contract additional proceedings for subscription are required. This unit does not include the DSU

(Digital Service Unit). The DSU is needed separately. The DSU to be used should be qualified as an electric communica-
tions terminal unit.

Weight and dimensions indicated are approximate.
Specifications are subject to change without notice.

Switch protector  ................................................................................... 1
Rack mount bracket  ............................................................................. 2
Mounting bracket screw (M3)  .............................................................. 6
Power cord (2.5 m) ............................................................................... 2
8-conductor modular cable (for ISDN network) (3 m)  .......................... 1
6-conductor modular cable (for host RS-485 data port) (3 m)  ............. 1

* The figures given in the quantity column are per AV Codec.

WJ-AV20

MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS..............................................................1

ADJUSTMENT PROCEDURE ................................................................................................................2

LOCATION OF TEST POINTS AND ADJUSTING CONTROL ..............................................................2

WIRING DIAGRAM .................................................................................................................................3

CONTROL BOARD  ...........................................................................................................................4

MAIN BOARD(1/4)   ...........................................................................................................................6

MAIN BOARD(2/4)   ...........................................................................................................................7

MAIN BOARD(3/4)   ...........................................................................................................................8

MAIN BOARD(4/4)   ...........................................................................................................................9

FRONT BOARD  ..............................................................................................................................10

PIO BOARD .....................................................................................................................................11

POWER BOARD  .............................................................................................................................13

CONTROL BOARD  ...........................................................................................................................4

MAIN BOARD .....................................................................................................................................5

FRONT BOARD  ..............................................................................................................................10

PIO BOARD .....................................................................................................................................12

POWER BOARD  .............................................................................................................................14

EXPLODED VIEW.................................................................................................................................15

REPLACEMENT PARTS LIST  ............................................................................................................16

WJ-AV20

q

Power Switch (POWER, ON / OFF)
This switch is used to turn the WJ-AV20 AV Codec
power on and off.
The LED indicator lights up while the codec power is
turned on.
Note: To prevent the AC Codec power from being

turned off accidentally, install the supplied switch
protector as shown below.

w

Controller Jack (REMOTE)
This jack is provided for controlling the AV Codec with
the WV-CU20E Remote Controller.

SIGNAL GND

AC  IN

OFF ON

RS–485

RS–232C

ON 

↓

6

5

4

3

2

1

1

1

2

2

4

5

3

OUT

IN

TEST

SETUP

REMOTE DATA PORT

HOST PORT

HOST PORT

VIDEO

IN

OUT

TERM

SENSOR IN/TRIGGER OUT

PARALLEL PORT

ISDN

AUDIO

!1

!3 !4

!6

!7 !8 !9

!5

!2

@0

@1

@2 @3

@4

@5

@6

@7

LINE

1

LINE

2

RING.VOL

AV Codec WJ–AV 

POWER

ON

OFF

REMOTE

q

w

r

e

t

●

●

To connect the controller, use a 6-conductor DIN cable
supplied as an accessory with the controller.
If the controller is connected to the REMOTE port on the
rear of the AV Codec, use a 6-conductor modular cable
supplied as an accessory with the controller.

e

Line Indicators (LINE1/LINE2)
Indicates when the line is being used.

r

Ringer Volume Control (RING VOL)
This control is used to adjust the alert tone to the
desired level for receiving calls.

t

SWITCH

PROTECTOR

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