JVC JX-S333-J Service Manual

SERVICE MANUAL

AV SELECTOR

XC03120053

JX-S333-J

POWER

SOURCE
SELECT

1

2

3

4

DUBBING LOCK

(MONITOR SELECT)

LINK

Model No.

ST

ANDBY/ON

1

SOURCE SELECT

2

3

4

DUBBING

(MONITOR SELECT)

LOCK

LINK

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

COPYRIGHT © 2005 Victor Company of Japan, Limited

No.XC031

2005/3

SPECIFICATION

Product name AV selector

Input/output connectors Inputs:4 lines (Component, S-VIDEO, AUDIO L/R) x 4

Outputs:2 lines (S-VIDEO, AUDIO L/R) x 2
Monitor outputs:1 line (Component, S-VIDEO, AUDIO L/R) x 1

Video inputs Reference level

S-VIDEO Y:Vp-p = 1.0 V (75 Ω)
C: Vp-p = Burst 0.286 V/ Cyan 0.642 V (75 Ω)

Component signals

Y: Vp-p = 1.0 V (75Ω)
Cb/Pb: Vp-p = 0.7 V (75 Ω)
Cr/Pr: Vp-p = 0.7 V (75 Ω)

Maximum input

S-VIDEO V: Vp-p = 1.5 V (75Ω)
C: Vp-p = Burst 0.429 V/ Cyan 0.963 V (75Ω)

Component signals

Y: Vp-p = 1.5 V (75Ω)
Cb/Pb: Vp-p = 1.05 V (75Ω)
Cr/Pr: Vp-p = 1.05 V (75Ω)

Video outputs
(Reference level)

Video crosstalk 50 dB or more (45 dB or more between Y/C and Y/Pb/Pr in the same channel)

Video S/N ratio 50 dB or more

Video frequency response S-VIDEO: 10 MHz, Component signals: 30 MHz

Audio inputs Reference level: -10 dBV (47 kΩ)

Audio outputs -10 dBV (with reference input, 1 kHz)

Audio crosstalk 80 dB or more (1 kHz)

Audio S/N ratio 80 dB or more

Audio frequency response 5 Hz to 50 kHz

Distortion Less than 0.03% (with reference input, 1 kHz)

Power requirements AC 120 V ~, 60 Hz

Power consumption 6 W (less than 2.0 W in standby mode)

Dimensions (W) 435 mm x (H) 64 mm x (D) 282 mm (including knobs, jacks, and feet)

Main body weight 2.4 kg (5.3 lbs)

Accessories Remote control unit (RM-AJ333), “AA” (R6/UM-3) battery x 2 (for operation testing)

S-VIDEO Y: Vp-p = 1.0 V (75Ω)
C: Vp-p = Burst 0.286 V/ Cyan 0.642 V (75Ω)

Component signals

Y: Vp-p = 1.0 V (75Ω)
Cb/Pb: Vp-p = 0.7 V (75Ω)
Cr/Pr: Vp-p = 0.7 V (75Ω)

Maximum level:+6 dBV (1 kHz, 1% distortion)

(17-3/16" x 2-9/16" x 11-1/8")

1-2 (No.XC031)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and components specially for safety purpos­es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per­formed by qualified personnel only.

(2) Alterations of the design or circuitry of the product should

not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteris­tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us­ing replacement components rated for higher voltage, watt­age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser­vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac­teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.

(4) The leads in the products are routed and dressed with ties,

clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem­bling.

(5) Leakage shock hazard testing)

After reassembling the product, always perform an isola­tion check on the exposed metal parts of the product (an­tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.

• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular­ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur­rent must not exceed 0.5mA AC (r.m.s.).

• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000 ohms per volt or more sensi­tivity in the following manner. Connect a 1,500 ohm 10W
resistor paralleled by a 0.15 F AC-type capacitor be­tween an exposed metal part and a known good earth
ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return

path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).

1.2 Warning

(1) This equipment has been designed and manufactured to

meet international safety standards.

(2) It is the legal responsibility of the repairer to ensure that

these safety standards are maintained.

(3) Repairs must be made in accordance with the relevant

safety standards.

(4) It is essential that safety critical components are replaced

by approved parts.

(5) If mains voltage selector is provided, check setting for local

voltage.

1.3 Caution

Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre­forming repair of this system.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical for
safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer. (Except
the JC version)

(No.XC031)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

Location of major parts

Top cover

Front panel assembly

Main board

Rear panel

Switch board

Remote control board

Bottom chassis

1-4 (No.XC031)

SECTION 3

TOP COVER

BOTTOM

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the top cover (See Figure 1)

(1) Remove the four screws [A] attaching the top cover on

both sides of the main body.

(2) Remove the two screws [B] attaching the top cover on the

back of the main body.

(3) Raise the both sides and lower part of the rear of the top

cover, with opening them slightly in an outward direction.
And the top cover will be removed.

3.1.2 Removing the front panel assembly (See Figure 2, Figure 3)

• Prior to performing the following procedure, remove the top
cover.
(1) Disconnect the card wire and socket wire from connectors

, CN2 on the main board respectively.

CN1

(2) Remove the three screws [C] attaching the front panel as-

sembly on the bottom of the main body.

(3) Hook [a] is removed, and the front panel assembly is re-

moved.

TOP COVER

TOP COVER

A

x 2

A

x 2

Front panel assembly

Main board

B

Fig.1

CN1 CN2

Fig.2

C

B

Hook a

Front panel assembly

3.1.3 Removing the switch board and remote control board (See Figure 4)

• Prior to performing the following procedure, remove the top
cover, front panel assembly.
(1) Remove the five screws [D] attaching the switch board and

remote control board.

Front panel assembly

C

Hook a

Fig.3

Switch board

Fig.4

C

BOTTOM

DDD

DD

Remote control
board

(No.XC031)1-5

3.1.4 Removing the rear panel and main board (See Figure 5, Figure 6)

• Prior to performing the following procedure, remove the top
cover.
(1) Disconnect the card wire and socket wire from connector

CN1, CN2 on the main board respectively.

(2) Disconnect the power cord from connector CN901

main board.

(3) Remove the twenty-two screws [E] attaching the rear pan-

el.
(4) Remove the two screws [F] attaching the main board.
(5) The fastener one place where the main board is fixed is re-

moved.

on the

F

F

CN1

CN2 CN901

Fastener

Main board

Fig.5

Main board Rear panel

Fig.6

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

Power cord

E

1-6 (No.XC031)

SECTION 5

TROUBLESHOOTING

5.1 Circuit explanation

5.1.1 IC1(uPD780021AYGKN1)

uPD780021AYGKN1 is single chip microcomputer of 64 pin 8 bit equipped with the memory of ROM:8k byte / RAM:512 byte

* Pin layout

P47/AD7

P46/AD6

P45/AD5

P44/AD4

P43/AD3

P42/AD2

P41/AD1

P40/AD0

P67/ASTB

P66/WAIT

P65/WR

P64/RD

P75/BUZ

P74/PCL

P73/TI51/TO51

P72/TI50/TO50

64 555657585960616263 54 4950515253

P50/A8

P51/A9

P52/A10

P53/A11

P54/A12

P55/A13

P56/A14

P57/A15

Vsso

Vddo

P30

P31

P32

P33

P34/SI31

P35/SO31

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17 262524232221201918 27 3231302928

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

P71/TI01

P70/TI00/TO00

P03/INTP3/ADTRG

P02/INTP2

P01/INTP1

P00/INTP0

Vss1

X1

X2

IC(Vpp)

XT1

XT2

RESET

AVdd

AVref

P10/ANI0

P20/SI30

P20/SO30

P36/SCK31

P24/TxD0

P23/RxD0

P22/SCK30

AVss

Vdd1

P25/ASCK0

P17/NI7

P16/AIN6

P14/ANI4

P13/ANI3

P15/ANIN5

P12/ANI2

P11/ANI1

(No.XC031)1-7

* Block diagram

KEY

1ch

KEY

2ch

P-SW

HD

KEY

3ch

KEY

4ch

REMO

D-SW

S-SW 1

S-SW 2

S-SW 3

S-SW 4

P-ON

P-ON

LOCK

LED_1CH

LED_2CH

LINK

LED_3CH

LED_4CH

LED_LOCK

LED_LINK

D-OFF1

D-OFF2

CH-SEL1

CH-SEL2

CH-SEL3

CH-SEL4

CXA2079Q

CXA2019Q

* Pin function (1/2)

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

SONY/

SONY/

Symbol

P50

P51

P52

P53

P54

P55

P56

P57

Vsso

Vddo

P30

P31

P32/SDA0

I/O

O

O

O

O

O

O

O

O

I/O

D-SELA

D-SELB

PCT1

PCT2

Description

LED lighting output

LED lighting output

LED lighting output

LED lighting output

LED lighting output

LED lighting output

Switch of D and S

Switch of D and S

-

-

-

-

Ground of port

Positive power supply of port

Not use

Not use

I2C Bus communication (data)

1-8 (No.XC031)