Jvc Ks-fx321 User manual

SERVICE MANUAL

2003/01

KS-FX321

CASSETTE RECEIVER

49771200301

KS-FX321

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Area Suffix

U ---------- Other Areas

S.

BA

SS

SEL

D

ISP

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KS-FX321

1-2 (No.49771)

SECTION 1

Important Safety Precautions

1.1 Safety Precautions

!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.

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KS-FX321

(No.49771)1-3

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the front panel unit

(See Fig.1)

(1) Press the release switch and remove the front panel unit in

the direction of the arrow.

Fig.1

2.1.2 Removing the bottom cover

(See Fig.2)

(1) Turn the body upside down.

(2) Insert a screwdriver to the two joints aand two joints bon

both sides of the body and the joint con the back of the

body, then detach the bottom cover from the body.

CAUTION:

When disengaging the joint c using a screwdriver, do not dam-

age or break the board.

Fig.2

2.1.3 Removing the front chassis

(See Fig.3)

• Prior to performing the following procedure, remove the bottom

cover.

(1) Remove the two screws Aon each side of the body.

(2) Release the two joints dand the two joints eon the sides.

remove the front chassis toward the front.

Fig.3

Front panel assembly

Eject button

Bottom cover

Joint b

Joint c

Joint a

Joint d Joint e

Front chassis

Joint d

AJoint e

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KS-FX321

1-4 (No.49771)

2.1.4 Removing the heat sink

(See Fig.4)

(1) Remove the four screws Battaching the heat sink on the

left side of the body, and remove the heat sink.

Fig.4

2.1.5 Removing the rear panel

(See Fig.5 )

• Prior to performing the following procedure, remove the front

chassis, the heat sink and bottom cover.

(1) Remove the four screws Cattaching the rear panel and

three screw Dattaching the pine jack on the back of the

body.

Fig.5

2.1.6 Removing the main amplifier board assembly

(See Fig.6)

• Prior to performing the following procedure, remove the front

chassis, the heat sink, bottom cover and the rear panel.

(1) Remove the two screws Eattaching the main amplifier

board assembly on the top cover.

(2) Disconnect connector CN901,CN721 on the main amplifier

board assembly from the cassette mechanism assembly.

Fig.6

Heat sink

BB B

CC

CDD

EE

Main board assembly

CN901

CN721

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KS-FX321

(No.49771)1-5

2.1.7 Removing the cassette mechanism assembly

(See Fig.7)

• Prior to performing the following procedure, remove the front

chassis, the heat sink, bottom cover and the main amplifier

board assembly.

(1) Remove the four screws Fattaching the cassette mecha-

nism assembly from the top cover.

Fig.7

2.1.8 Removing the head amplifier board

(See Fig.8)

• Prior to performing the following procedure, remove the front

chassis, the bottom cover, the heat sink, the main board as-

sembly and the cassette mechanism assembly.

(1) Remove the screw Gattaching the head amplifier board.

(2) Move the head amplifier board in the direction of the arrow

to release the two joints fand remove.

(3) Disconnect the wire from CJ901 on the head amplifier

board.

Fig.8

FF

F F

Top chassis

Cassette mechanism

joint f

G

CJ901

Head amplifier board

To head relay board

joint f

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KS-FX321

1-6 (No.49771)

2.1.9 Removing the chassis assembly

(See Fig.9,10)

• Prior to performing the following procedure, remove the front

chassis, the bottom cover, the heat sink, the main board as-

sembly , the cassette mechanism assembly and the head am-

plifier board.

(1) Turn the left side to cassette mechanism assembly.

(2) Disconnect the wire from CP722 on the relay board.

(3) Remove the screw Hattaching the relay board.

(4) Move the relay board in the direction of the arrow to release

the joint g,and remove.

(5) Turn the back side down , remove the four screws Iattach-

ing the chassis assembly.

Fig.9

Fig.10

joint g

H

CP722

Relay board

Chassis assembly

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KS-FX321

(No.49771)1-7

2.1.10 Removing the (LCD & key) control switch board

(See Fig.11~13)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Remove the four screws Jattaching the rear cover on the

back of the front panel assembly.

(2) Unjoint the eleven joints hwith the front panel and the rear

cover.

(3) Remove the control switch board on the back of the front

panel.

Fig.11

Fig.12

Fig.13

J

J J

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Joint h

LCD & Key control board

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KS-FX321

1-8 (No.49771)

2.2 Cassette mechanism assembly

• Prior to performing the following procedures, remove the head

amplifier board, the relay board and the mechanism bracket.

2.2.1 Removing the direction switch board

(See Fig.1)

(1) Unsolder the three wires aon the direction switch board.

(2) Remove the one screw Aattaching the direction switch

board.

2.2.2 Removing the FF / REW lever assembly

(See Fig.1)

(1) Remove the screw Battaching the FF / REW lever assem-

bly on the back of the cassette mechanism assembly.

(2) Remove the screw Con the upper side of the FF / REW le-

ver assembly.

(3) Lift and pull forward the FF / REW lever assembly to disen-

gage the joints b, c, dand e.

2.2.3 Reattaching the FF / REW lever assembly

(See Fig.1)

(1) Reattach the FF / REW lever assembly to the joint con the

back of the chassis.

(2) Reattach the pinch-roller shaft e, the change lever dand

the return link eto the chassis.

Fig.1

2.2.4 Removing the playback head

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the screw Dattaching the playback head.

(2) Remove the Cwasher and pull out the FF roller.

(3) Remove the Ssupport plate, the A arm spring (a) and (b),

the playback head.

ATTENTION:

The A arm spring (a) differs from the A arm spring (b).

2.2.5 Removing the pinch-roller (R) and (F) assembly

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the P arm spring (f) in the pinch-roller (F) assem-

bly from the chassis.

(2) Remove the P arm spring (r) in the pinch-roller (R) assem-

bly from the chassis.

(3) Draw out the pinch roller (F) and (R) assembly from the

shaft.

ATTENTION:

The P arm spring (f) differs from the P arm spring (r).

ATTENTION:

The pinch roller (F) assembly differs from the pinch roller (R)

assembly.

Fig.2

C

FF / REW lever assembly

Joint c

Joint b

B

A

Direction switch board

Joint d

Joint e

Soldering a

A arm spring (b) A arm spring (a)

Pinch-roller (R) assembly Pinch-roller (F) assembly

Shaft Shaft

S support plate

D

C washer

P arm spring (f)

P arm spring (r)

Remove the P arm spring (f)

from the chassis.

Remove the P arm spring (r)

from the chassis.

Playback head

FF roller

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KS-FX321

(No.49771)1-9

2.2.6 Removing the cassette hanger / cassette holder

(See Fig.3)

• Prior to performing the following procedure, remove the FF /

REW lever assembly.

(1) From the rear of the unit, bend the two tabs foutwards and

disengage the two joints gin the direction of the arrow.

(2) Push the eject lever and remove the cassette holder from

the playback head. Disengage the two joints hof the cas-

sette hanger / cassette holder and the eject lever in the di-

rection of the arrow.

(3) Lift the cassette hanger / cassette holder and disengage

the joint iof the return link and the eject lever.

Fig.3

2.2.7 Removing the reel disc assembly

(See Fig.4)

• Prior to performing the following procedure, remove the FF /

REW lever assembly and the cassette hanger / cassette hold-

er.

(1) Remove the C washer and pull out reel disc assembly.

ATTENTION:

Replace with a new C washer when reattaching.

Fig.4

2.2.8 Removing the motor assembly

(See Fig.5)

(1) Unsolder the two wires jon the motor assembly.

(2) Turn over the cassette mechanism assembly and remove

the main belt and the sub-belt from the motor pulley.

ATTENTION:

The main belt can now be removed.

(3) Remove the two screws Gattaching the motor assembly.

Fig.5

Cassette holder

Cassette hanger

Return link

Joint i

Eject lever

Joint h

Joint g

Joint g Tab f

Tab f

Chassis

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

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KS-FX321

1-10 (No.49771)

2.2.9 Removing the Flywheel (BF) and (BR) assembly

(See Fig.4 and 5)

• Prior to performing the following procedure, remove the cas-

sette hanger / cassette holder.

(1) From the upper side of the cassette mechanism assembly,

remove the C washer from each shaft of the flywheel (BF)

and (BR).

(2) Turn over the cassette mechanism assembly and remove

the main belt. Pull out the flywheel (BF) and (BR) down-

ward respectively.

Fig.4

Fig.5

2.2.10 Removing the reel base assembly

(See Fig.5 and 6)

(1) Raise the part kof the reel base assembly slightly and re-

move the selector link (B) on the front side of the cassette

mechanism assembly by turning it as shown in Fig.6.

(2) Remove the three screws Eand the one screw Fon the un-

derside of the cassette mechanism assembly.

ATTENTION:

The reel base assembly is not repairable. Handle with care.

Fig.6

Fig.7

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Selector link (B).

Pinch-roller (R) assembly

Turn the selector link (B).

k

Inside of the reel base assembly

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KS-FX321

(No.49771)1-11

2.2.11 Removing the mute switch board

(See Fig.8)

(1) Unsolder the two wires lon the mute switch board on the

back of the cassette mechanism assembly.

(2) Remove the screw Hattaching the mute switch board.

Fig.8

2.2.12 Removing the power switch

(See Fig.9)

• Prior to performing the following procedure, remove the motor

assembly.

(1) Unsolder the two wires mon the power switch on the side

of the cassette mechanism assembly.

(2) Remove the screw Iattaching the power switch.

Fig.9

Cassette mechanism assembly

Soldering l

HMute switch board

Rower switch

Motor assembly

Soldering m

IPower switch

Cassette mechanism assembly

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KS-FX321

1-12 (No.49771)

SECTION 3

Adjustment method

Test Instruments reqired for adjustment

1. Digital osclloscope(100MHz)

2. Frequency Counter meter

3. Electric voltmeter

4. Wow & flutter meter

5. Test Tapes

VT724 ....................... for DOLBY level measurement

VT739 ............ For playback frequency measurement

VT712 .... For wow flutter & tape speed measurement

VT703 ..................... For head azimuth measurement

6. Torque gauge .................... Cassette type for CTG-N

(mechanism adjustment)

Measuring conditions(Amplifier section)

Power supply voltage .............. DC14.4V (10.5 - 16V)

Load impedance ........... 4Ω(2Speakers connection)

Line out............................................................ 20Ωk

Standard volume position

Balance and Bass,Treble volume .Fader

:Center(Indication"0")

Loudness,Dolby NR,Sound,Cruise:Off

Volume position is about 2V at speaker output with

following conditions.Playback the test tape VT721.

AM mode 1,000kHz/62dB,INT/400Hz,30%

modulation signal on recieving.

FM mono mode 97.9MHz/66dB,INT/400Hz,22.5kHz

deviation pilot off mono

FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev.

Output level 0dB (1µV, 50Ω /open terminal)

Frequency Band

FM 87.5-107.9MHz

AM 530-1710KHz

Extension cord

: EXTKSRT002-6P

Cassette mechanism

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KS-FX321

(No.49771)1-13

Playback head

Head azimuth screw

Fixed screw

Height adjusting screw c

Height adjusting screw b

Height adjusting screw a

Arrangement of Adjusting & Test points

Head section view

Cassette mechanism

(Surface)

Tape speed adjust

Motor assembly

Playback head

Azimuth screw

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KS-FX321

1-14 (No.49771)

Mechanism adjustment section

Item Adjusting & Confirmation Methods Adjust Std. Value

Head shield

The head is at low position

during FWD.

The head is at height position

during REV.

A Line

B Line

Phase

screw (c) screw (a)

screw (b)

Head azimuth

screw Fixed screw

0

°

45

°

1. Head azimuth

2. Tape Speed and

Wow & Flutter

3. Playback

Frequency

response

"Head Height Adjustment"

Note

Adjust the azimuth directly. When you adjust the height

using a mirror tape, remove the cassette housing from the

mechanism chassis.

After installing the cassette housing, perform the azimuth

adjustment.

1. Load the mirror tape ( SCC-1659 ). Adjust with height

adjustmentscrew (a) and azimuth adjustment screw (b) so

that line "A" of the mirror tape runs in the center between

Lch and Rch in the reverse play mode.

2. After switching from REV to FWD then to REV, check that

the head position set in procedure "1" is not changed.

*If the position has shifted, adjust again and check.

3. Adjust the azimuth screw (b) so that line "B" of the mirror

tape runs in the center between Lch and Rch in the forward

play mode.

"Head Azimuth Adjustment"

1. Load the test tape ( VT724: 1kHz ) and play it back in the

reverse play mode. set the Rch output level to maximum.

2. Load the test tape ( VT703: 10kHz ) and play it back in the

forward play mode. Adjust the Rch and Lch output levels

tomaximum, with azimuth adjustment screw (b).

In this case, the phase difference should be within 45°.

3. Engage the reverse mode and adjust the output level to

maximum, with azimuth adjustment screw (c).

*The phase difference should be 45° or more.

4. When switching between forward and reverse modes, the

difference between channels should be within 3dB.

*Between FWD Lch and Rch, REV Lch and Rch.

5. When the test tape ( VT721 : 315Hz ) is played back, the

level difference between channels should be within 1.5dB.

1. Check to see if the reading of the frequency counter & Wow

flutter meter is within 2940-3090 Hz ( FWD/REV ), and less

than 0.35% ( JIS RMS ).

2. In case of out of specification, adjust the motor with a built-

in volume resistor

Built-in

volume resistor

Tape Speed

2940-3090Hz

Wow&Flutter

Less than

0.35%

(JIS RMS)

Speaker out

1kHz/8kHz

: 0dB_}3dB,

125Hz/1kHz

: -4dB+2dB,

1. Play the test tape ( VT724 : 1kHz ) back and set the volume

position at 2V.

2. Play the test tape ( VT739 ) back and confirm 0

±

3dB at 1kHz/

8kHz and -4+2dB at 1kHz/125Hz.

3. When 8kHz is out of specification, it will be necessary to

read adjust the azimuth.

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TEL 13942296513 QQ 376315150 892498299

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KS-FX321

(No.49771)1-15

SECTION 4

Description of major ICs

4.1 LC75823W (IC651) : LCD driver

• Pin Layout & Symbol

• Pin function

Pin No. Symbol I/O Functions

1 to 52 S1 to S52 O Segment output pins used to display data transferred by serial data input.

53 to 55 COM1 to COM3 O Common driver output pins. The frame frequency is given by : t0=(fosc/384)Hz.

56 VDD - Power supply connection. Provide a voltage of between 4.5 and 6.0V.

57 INH I Display turning off input pin.

INT="L" (VSS) ----- off (S1 to S52, COM1 to COM3="L"

INT="H" (VDD)----- on

Serial data can be transferred in display off mode.

58 VDD1 I Used for applying the LCD drive 2/3 bias voltage externally.

Must be connected to VDD2 when a 1/2 bias drive scheme is used.

59 VDD2 I Used for applying the LCD drive 1/3 bias voltage externally.

Must be connected to VDD1 when a 1/2 bias drive scheme is used.

60 VSS - Power supply connection. Connect to GND.

61 OSC I/O Oscillator connection.

An oscillator circuit is formed by connecting an external resistor and capacitor at this pin.

62 CE I Serial data interface connection to the controller. CE : Chip enable

63 CL I Serial data interface connection to the controller. CL : Sync.clock

64 DI I Serial data interface connection to the controller. DI : Transfer data

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

S1

S2

S3

S4

S5

S6

S7

S8

S9

S10

S11

S12

S13

S14

S15

S16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

S48

S47

S46

S45

S44

S43

S42

S41

S40

S39

S38

S37

S36

S35

S34

S33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

S17

S18

S19

S20

S21

S22

S23

S24

S25

S26

S27

S28

S29

S30

S31

S32

DI

CL

CE

OSC

Vss

VDD2

VDD1

INH

VDD

COM3

COM2

COM1

S52

S51

S50

S49

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KS-FX321

1-16 (No.49771)

4.2 LC72362N-9B39 (IC701) : Micon

• Pin layout

• Pin functions

41 - 64

24 - 1

25

40

80

64

-

No. Symbol I/O Function

1 XIN I Crystal oscillator

2GND-ToGND

3 J BUS SI I Bus serial data input from CP751

4 J BUS SO O Bus serial data output to CP751

5 J BUS SCK O Bus serial clock output to CP751

6 J BUS I/O SEL O BUS I/O switch signal output

7 NC - Non connect

8 LCD SO O Serial data output to IC651

9 LCD SCK O Serial clock output to IC651

10 LCD CE O Chip enable output to IC651

11 NC - Non connect

12 E.VOL SO O Serial data output

13 E.VOL SCK O Serial clock output

14 CE - Chip enable output

15 TUNER ILLUM - Non connect

16 TAPE ILLUM - Non connect

17 CD ILLUM - Non connect

18 DIMMEROUT - Non connect

19 NC - Non connect

20 NC - Non connect

21 NC - Non connect

22 NC - Non connect

23 NC - Non connect

24 NC - Non connect

25 KS1 - Non connect

26 KS0 O Initializing output port

27 K3 I Initializing input port

28 K2 I Initializing input port

29 K1 - Non connect

30 K0 I Initializing input port

31 Vdd - Power supply

32 TEST I Test iput

33 NC - Non connect

34 SEEK/STOP O Output the "If signal request"

35 MONO O Monaural and stereo change over

output

36 R/T - Non connect

37 NC - Non connect

38 POWER CNT O Power control output

39 NC - Non connect

40 NC - Non connect

41 IF CONT - Non connect

42 NC - Non connect

43 NC - Non connect

44 NC - Non connect

45 NC - Non connect

46 NC - Non connect

47 NC - Non connect

48 TAPE IN I H:RADIO L:TAPE

49 F/R SENCE I FORWARD/REVERSE switch de-

tector

50 TAPE MUTE I DIR.FF/REW.MUTE

51 SD/ST I Station detector and ST input

52 NC - Non connect

53 DETACH I Detection of Front Panel

54 NC - Non connect

55 J BUS INT I BUS interruption signal detection

communication

56 REMOCON - TO GND

57 FM/AM I Change over the FM/AM iuput

58 DOLBY - Non connect

59 NC - Non connect

60 MUTE - The mute time is controlled by the

connected

61 MEMORY DET I Memory detector input

62 LEVEL METER I -----

63 SMETER I Signal meter input

64 KEY 2 I Momentary key input

65 KEY 1 I Momentary key input

66 KEY 0 I Momentary key input

67 ACCDET I ACC DET

68 SENS - To GND

69 NC I Non connect

70 FM/AM IF COUNT - AM/FM Frequency detection

71 NC - Non connect

72 NC - Non connect

73 Vdd I Power supply

74 AM OSC I Input the local oscillator signal of AM

75 FM OSC - Input the local oscillator signal of FM

76 Vss - Power supply

77 NC - Non connect

78 EO - PLL Error signal output

79 TEST 1 O To GND

80 XOUT O Crystal oscillator

No. Symbol I/O Function

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KS-FX321

(No.49771)1-17

4.3 AN80T05LF (IC781) : Regulator

• Pin layout & Block diagram

• Pin function

4.4 UPC1228HA (IC901) : Head amp

Pin No. Symbol Function

1 ILL 10V power supply for illumination.

2 MODE2 When 5V is input,becomes AM. and the antenna output is turned on.

3 MODE1 When 5V is input,becomes AM. and the output of FM is switched.

4 STB When 5V is input outputs to ILL,COMand AMP. It is 0V usually.

5 VDD 5.6V power supply.

6 AMP Power supply supply to remote amplifier

7 VCC Back up. connects with ACC with it.

8 ANT Power supply supply to auto antenna.

9 COM 8.7V power supply.

10 AM The power supply of 8.7V to AM.

11 FM The power supply of 8.7V to FM.

12 GND Ground

Pre

Drive

Thermal

Protection

Reference Voltage

Pre

Drive

AMP

Out

ASO & Peak

Current Protection

AMP

Out

Pre

Drive Pre

Drive

Pre

Drive

123456789101112

ILL

10V

MODE2 MODE1 STB VDD

5.6V

AMP VCC ANT COM

8.7V

AM

8.7V

FM

8.7V

GND

ANP1

ANP2

UPC1228HA

1

2

3

4

5

6

7

8

IN1

NFB1

OUT1

VCC

GND

OUT2

NFB2

IN2

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TEL 13942296513 QQ 376315150 892498299

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KS-FX321

1-18 (No.49771)

4.5 LC75421M-X (IC931): E. volume

• Pin layout

• Block diagram

36 ~ 19

1 ~ 18

34

33

32

31

30

29

28

27

26

25

24

23

222120

19

18

17

1615

14

13

12

11

10

9

8

7

6

5

4

32136 35

CCB

INTERFACE

CONTROL

CIRCUIT

LOGIC

CIRCUIT

CONTROL

CIRCUIT

LVref

RVref

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6

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KS-FX321

(No.49771)1-19

• Pin functions

Pin No Symbol Function

1 DI Serial data input terminal for control

2 CE Chip enable terminal

3 VSS GND

4 LROUT Rear Lch fader output terminal

5 LFOUT Front Lch fader output terminal

6 LFIN Front Lch input terminal

7 LOUT C & R connection terminal for super bass band

8 LSB C & R connection terminal for super bass band

9 LBASS2 C & R connection terminal for bass band

10 LBASS1 C & R connection terminal for bass band

11 LTRE Capacitor connection terminal for treble band filter

12 LIN Lch input terminal

13 LSELO Input selector output terminal

14 L5 input signal terminal

15 L4 input signal terminal

16 L3 input signal terminal

17 L2 input signal terminal

18 L1 input signal terminal

19 Vref Power supply for analog GND

20 R1 input signal terminal

21 R2 input signal terminal

22 R3 input signal terminal

23 R4 input signal terminal

24 R5 input signal terminal

25 RSELO Input selector output terminal

26 RIN Rch input terminal

27 RTRE Capacitor connection terminal for treble band filter

28 RBASS1 C & R connection terminal for bass band filter

29 RBASS2 C & R connection terminal for bass band filter

30 RSB C & R connection terminal for super bass band filter

31 ROUT C & R connection terminal for super bass band filter

32 RFIN Rch input terminal

33 RFOUT Front Rch fader output terminal

34 RROUT Rear Rch fader output terminal

35 VDD Power supply terminal

36 CL Serial clock output terminal for control

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KS-FX321

1-20 (No.49771)

4.6 LA4743K (IC981) : Power amp.

• Block diagram

11

6 20

1

4

10

15

25

13

14

16

12

9

8

5

7

2

22

17

19

18

21

23

24

3

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

IN 1

IN 2

ST BY

Vcc 1/2 Vcc 3/4

OUT 1+

OUT 1-

PWR GND1

OUT 2+

OUT 2-

PWR GND2

R.F

IN 3

IN 4

PRE GND

ON TIME C Muting &

ON Time Control

Circuit

Protective

circuit

Protective

circuit

Mute

circuit

Ripple

Filter

Stand by

Switch

N.C

+

0.22 F

2200 F 0.022 F

0.22 F

TAB

+5V

ST ON

+

47 F

0.22 F

22 F

+

Mute 10K

+

3.3 F

OUT 3+

OUT 3-

Low Level

Mute ON

PWR GND3

OUT 4+

OUT 4-

PWR GND4

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KS-FX321 User manual

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