Jvc MX-K6 User Manual

MX-K5/MX-K6

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-K5 / MX-K6		MX-K5
	J	U.S.A.
		Area Suffix
	C	Canada
		MX-K6

						DISC CHANGE
						CD-R/RW PLAYBACK
		COMPACT COMPONENT SYSTEM MX-K5				SOUND
						MODE
						ACTIVE BASS
						EX. LEVEL
						PRESET
1	2	3
4	5	6
					SET
7	8	9
					CANCEL
10	+10				/DEMO
		PHONES
				TUNING
		CLOCK
		/TIMER DISPLAY	REPEAT PROGRAM	RANDOM
			REC START CD		TAPE A	TAPE B
		ACTIVE BASS EXTENSION	/STOP	REC START DUBBING
	+	C O M P U P L AY C O N T R O L

Area Suffix

C

Canada

–	EJECT		EJECT
	A PLAY	FULL - LOGIC CONTROL	CD SYNCHRO RECORDING REC/PLAY B

SP-MXK5 CA-MXK5 SP-MXK5

Each difference points

MODEL	CD/DECK/	Speaker		Color
			POWER / SUB / CD EJECT /		VOLUME RING
	RECEIVER							CD fitting
			DISK CHANGER bottom		ornament
MX-K5	CA-MXK5	SP-MXK5	SILVER
MX-K6	CA-MXK6	SP-MXK6	METALLIC LIGHT GRAY

Contents

Safety Precautions	1-2
Important for laser products	1-3
Preventing static electricity	1-4
Disassembly method	1-5
Wiring connection	1-19
Adjustment method	1-20

Flow of functional operating
until TOC read	1-24
Maintenance of laser pickup	1-25
Replacement of laser pickup	1-25
Trouble shooting	1-26
Description of major ICs	1-29

No.20928

COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.

Mar. 2001

MX-K5/MX-K6

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 manufacturer`s

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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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

10W resistor paralleled by

a 0.15

F AC-type

capacitor

between an

exposed

metal part and a known good earth ground.

AC VOLTMETER

Measure the

AC voltage across the resistor

with the

(Having 1000

AC voltmeter.

ohms/volts,

Move

the

resistor

connection

to each

exposed

or more sensitivity)

metal

part,

particularly

any

exposed

metal part

0.15

F AC TYPE

having a return path to the

chassis, and meausre

the

AC voltage across

the

resistor. Now, reverse

Place this

the plug in the AC outlet and repeat each

probe on

measurement. voltage

measured

any

must

not

1500

10W

each exposed

exceed 0.75 V AC

(r.m.s.). This corresponds to 0.5

metal part.

mA

AC (r.m.s.).

Good earth ground

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.

! 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.

1-2

MX-K5/MX-K6

Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

! CAUTION Please use enough caution not to see the beam directly or touch it

in case of an adjustment or operation check.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

FUSE CAUTION

FUSE CAUTION LABEL

Power transformer

Bottom shassis

MX-K5/MX-K6

Preventing static electricity

1. Grounding to prevent damage by static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

2. About the earth processing for the destruction prevention by static electricity

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment.

Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

2-2 Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption)

Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

2.Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

1.Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2.Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

3.Handle the flexible cable carefully as it may break when subjected to strong force.

4.It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

Attention when CD mechanism assembly is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the CD mechanism assembly.

1.Remove the CD changer unit.

2.Remove the CD changer mechanism.

3.Solder is put up before the card wire is removed from the pickup unit connector on the CD mechanism assembly.

(When the card wire is removed without putting up solder, the CD pick-up assembly might destroy.)

4.Please remove solder after connecting the card wire with the pickup unit connector when you install picking up in the substrate.

Card wire

Picup unit connector

Soldering

CD changer unit

CD changer mechanism

Fig.1

Card wire

Picup unit connector

Fig.2

1-4

			MX-K5/MX-K6
Disassembly method		A	Metal cover
<Main body>
Removing the metal cover	A		A
(See Fig.1 to 3)

1.Remove the three screws A attaching the metal cover on the back of the body.

2.Remove the six screws B attaching the metal cover on both sides of the body.

3.Remove the metal cover from the body by lifting the rear part of the cover.

	ATTENTION: Do not break the front panel tab fitted	Fig.1
	to the metal cover.

B

Metal cover

B Fig.2

Metal cover B

B Fig.3

MX-K5/MX-K6

Removing the CD Tray fitting (1)

(See Fig. 4 to 6)

Prior to performing the following procedure, remove POWER button the metal cover.

1.Press the POWER button. Press the OPEN/CLOSE button to eject the CD tray.

2.After drawing the lower part of the tray fitting toward the front, remove the five claws a. Then, while moving the tray fitting upward, remove it.

3.Press the OPEN/CLOSE button to insert the tray.

CD tray fitting

Removing the CD Tray fitting (2)

(See Fig. 5 to 7)

- How to eject the CD tray without turning on power -

1.Turn the black loading pulley gear marked b from the back of the CD changer unit as shown in Fig.7 and draw the CD tray toward the front.

2.	After drawing the lower part of the tray fitting toward	Claw a
	the front, remove the five claws a. Then, while
	moving the tray fitting upward, remove it.
3.	Push and insert the CD tray manually.

(See Fig. 24)

CD tray

This slot of the board.

b

(Loading pulley gear)

CD tray

OPEN/CLOSE button

Fig.4

Joint

Fig.5

Fig.7

Fig.6

1-6

Removing the CD changer unit

(See Fig.8 to 10)

Prior to performing the following procedure, remove the metal cover.

1.Disconnect the card wire which is attached with adhesive to the left side of the CD changer unit.

2.Disconnect the card wire from connector CW105 of the CD servo board on the back of the CD changer unit.

3.Disconnect the harness from connector RCW6 on the inner side of the main board in the body.

Remove the two screws C attaching the CD changer

4.unit on the back of the body.

Remove the two screws D attaching the CD changer

5.unit on the both side of the body.

Draw the CD changer unit upward from behind while

6.pulling the rear panel outward.

Adhesive card wire strap

CD changer unit

D D

Rear panel

Fig.10 b

MX-K5/MX-K6

CD servo board

CW105 CD changer unit

Main board	RCW6

Fig.8

C

Rear panel

Fig.9

CD changer unit

Rear panel

Fig.10 a

Front panel assembly

MX-K5/MX-K6

Removing the front panel assembly

(See Fig.11 to 13)

Prior to performing the following procedure, remove the metal cover and the CD changer unit.

1.Disconnect the card wire from connector FCW3 and the harness from connector JCW1, JCW2 and HCW3 on the inner side of the main board in the body.

2.Remove the two screws E attaching the front panel assembly on both sides of the body.

3.Remove the screw F attaching the earth terminal extending from the cassette mechanism assembly.

4.Remove the screw G attaching the front panel assembly and main board.

5.Remove the screw H attaching the front panel assembly on the bottom of the body.

6.Release the two joints c on both sides and two joints d on the bottom of the body using a screwdriver.

Front panel assembly

FCW3	Main board
JCW2
JCW1

ACW1

ACW2

Joint c

E	F	HCW3
earth wire
	Fig.11

Front panel assembly

Main board

G

			Joint c
		E
	Fig.12
Joint d	H		Joint d

Bottom side

Fig.13

1-8

Removing the heat sink & AMP board (See Fig.14 and 15)

Prior to performing the following procedure, remove the metal cover and the CD changer unit.

1.Remove the four screws I attaching the heat sink cover on the back of the body. Remove the heat sink cover.

2.Remove the four screws J attaching the heat sink & AMP board to the rear panel on the back of the body.

3.Remove the two screws K attaching the speaker terminal to the rear panel on the back of the body.

4.Disconnect the card wire from connector ACW1 & the harness from connector ACW2 on the AMP board. (See Fig.11)

5.After moving the heat sink upward, remove the claws. Then pull out the heat sink & AMP board

Removing the tuner pack

(See Fig.15 and 16)

Prior to performing the following procedure, remove the metal cover and CD changer unit.

1.Disconnect the card wire from connector CON01 on the tuner board.

2.Remove the two screws L attaching the tuner pack.

Removing the rear cover

(See Fig.17)

Prior to performing the following procedure, remove the metal cover, CD changer unit, heat sink & AMP board and tuner pack.

1. Remove the four screws M attaching the rear panel.

M

M

MX-K5/MX-K6

I

Heat sink cover

I

Rear panel

Fig.14

Tuner terminal

J

L

Heat sink

K J

Speaker terminal

Fig.15

Main board

CON01

Tuner board

Fig.16

Fig.17

MX-K5/MX-K6

Removing the main Board

(See Fig. 18)

Prior to performing the following procedure, remove the metal cover, CD changer unit.

1.Disconnect the card wire from connector FCW3 and the harness from connector JCW1, JCW2 and HCW3 on the main board.

2.Disconnect the harness from connector PCW1 on the power transformer board.

3.Remove the screw G attaching the main board holder. (See Fig.12)

4.Remove the two screws N attaching the heat sink and bottom chassis.

Removing the power IC

(See Fig.19 and 20)

Prior to performing the following procedure, remove the metal cover CD changer unit and heat sink & AMP board.

1.Remove the two screws P attaching the power IC to the heat sink.

2.Unsolder the power IC solder point.

Removing the power transformer

(See Fig .21)

Prior to performing the following procedure, remove the metal cover, heat sink & AMP board, tuner pack and rear cover.

1.Disconnect the power cord from connector RCW2 of the power transformer board.

2.Disconnect the harness from connector PCW1 of the power transformer board.

3.Remove the four screws R attaching the power transformer and the screw S attaching the earth.

FCW3 JCW2 JCW1 HCW3

Main board

PCW1

N

Transformer board

Fig.18

P

Heat sink

Fig.19	AMP board

Power ICs solder point

Heat sink

Fig.20

Power transformer

PCW1

RCW2

R	R S
Power cord	Fig.21

1-10

<Front panel assembly>

Prior to performing the following procedure, remove the metal cover, the CD changer unit and the front panel assembly.

Removing the power / CD switch board (See Fig.22)

1.Disconnect the card wire from connector UCW1 on the power / CD switch board.

2.Remove the five screws T attaching the power / CD switch board and release the tab e.

MX-K5/MX-K6

Power / CD switch board	UCW1
	T
	Tab e
	U
UCW2	FLdiplay & system
UCW3	control board
UCW4	U
	UCW5
	UCW6

Fig.22

Removing the FL display & system control board

(See Fig.22 and 23)

1.Disconnect the card wire from the connector UCW3, UCW4,UCW5 and UCW6 on the FL & system control board.

2.Remove the five screws U attaching the FL & system board.

3.Disconnect the card wire from the connector UCW2 on the FL & system control board.

Sound mode knob

Subwoofer knob

Volume knob

Fig.23

Removing the headphone board

(See Fig.24)

Prior to performing the following procedure remove the FLdisplay & system control board.

1. You can pull out the headphone board.

Removing the front board (See Fig.24)

Prior to performing the following procedure, remove the FLdisplay & system control board.

1.Pull out the VOLUME knob, ACTIVE BASS EX. LEVEL knob and SOUND MODE nob from front

side.

2.

Remove the ten screws V attaching the front board and release the two tabs f out ward.

Removing the cassette mechanism assembly (See Fig.24)

1.Disconnect the card wire x from the mechanism board on the cassette mechanism assembly.

2.Remove the six screws W attaching the cassette mechanism assembly.

	V
Front board	Headphone
	board

f

V V

W

Card wire x

Cassette mechanism assembly

Fig.24

MX-K5/MX-K6

<CD changer unit>

Prior to performing the following procedure, remove the CD changer unit.

Removing the CD tray (See Fig.25 to 27)

1.Turn the black loading pulley gear on the under side of the CD changer unit in the direction of the arrow and draw the CD tray toward the front until it stops.

2.Disconnect the card wire from connector CW103 of the CD servo board on the upper side of the CD changer unit.

3.Push down the two tray stoppers marked g and pull out the CD tray.

Reinstall the CD tray (See Fig.28 to 29)

1.Align the gear-cam with the gear-tray as shown fig.27, then mount the CD tray.

2.When assembling the CD tray, take extreme care not engage with gear - synchro.

Gear-cam

Gear-tray

Loading pulley gear

CD tray

Fig.25

CD tray

Fig.26

g (Tray stopper)

CD tray

g (Tray stopper)

CD servo board CW103

Fig.27

Gear-convert	Gear-cam	Gear-synchro
	timing point
	Gear-tray
		CD tray
Gear-convert	Gear-tray	Fig.29
	Fig.28

1-12

Removing the sensor board / the turn table motor assembly (See Fig.30 to 32)

Prior to performing the following procedure, remove the CD tray.

1.Remove the screw X attaching the sensor board and release the two tabs h attaching the sensor board on the under side of the CD tray.

2.Disconnect the harness from connector CW1 on the sensor board and release the harness from the two

hooks i. Remove the sensor board.	i

3.Remove the screw Y attaching the turn table. Detach the turn table from the tray.

4.Pull outward the tab marked j attaching the turn table motor assembly on the upper side of the tray and detach the turn table motor assembly from the tray.

Tray

Turn table motor assembly

MX-K5/MX-K6

X

h

CW1

h

Sensor board

Fig.30

Turn table

Y

Fig.31

j

Fig.32

MX-K5/MX-K6

Removing the belt, the CD servo board and the switch board (See Fig.33 and 34)

Prior to performing the following procedure, remove the CD tray.

1.Detach the belt from the pulley on the upper side of the CD changer unit (Do not stain the belt with grease).

2.Disconnect the card wire from the pickup unit connector on the under side of the CD changer unit.

Attention : Solder is put up before the card wire is removed from the pick-up unit connector on the CD mechanism assembly.

(When the card wire is removed without putting up solder, the CD pick-up unit assembly might destroy.)

3.Disconnect the motor wire harness from connector on the CD servo board.

4.Remove the screw Z attaching the switch board and release the two tabs k attaching the switch board outward and detach the switch board.

5.Remove the two screws A' attaching the CD servo board and . First release the n side of the two tabs l and two tabs m attaching the CD servo board motor to raise the CD servo board slightly, then release the CD servo board.

If the tabs l and m are hard to release, it is recommendable to unsolder the two soldered parts on the motor terminal of the CD servo board.

Belt

CD changer unit

Fig.33

A' CD servo board

Tabs m

Soldered parts

Tabs k

Motor

Tabs l

Z

Switch board

CW3

CD mechanism board motor connector

Pickup unit connector

Card wire

Soldering	Pickup unit
	connector

Fig.34

1-14

Removing the CD mechanism holder assembly (mechanism included)

(See Fig.35 to 38)

1.Disconnect the harness from connector on the CD mechanism board in the CD mechanism assembly on the under side of the CD changer unit. Disconnect the card wire from the pickup unit connector.

Attention : Solder is put up before the card wire is removed from the pick-up unit connector on the CD mechanism assembly. (Refer to Fig. 33)

(When the card wire is removed without putting up solder, the CD pick-up unit assembly might destroy.)

2.Remove the screw B' attaching the shaft on the right side of the CD mechanism holder assembly. Pull outward the stopper fixing the shaft on the left side and remove the CD mechanism holder assembly from behind in the direction of the arrow.

3.Turn the CD mechanism holder assembly half around the lift up slide shaft n of the CD mechanism holder assembly until the turn table is reversed, and pull out the CD mechanism holder assembly.

MX-K5/MX-K6

Motor connector

CD changer unit

CD mechanism holder assembly Pickup unit connector

Fig.35

B'

Stopper

CD mechanism holder assembly

Fig.36

Lift up slide shaft n

Lift up slide shaft

y

CD mechanism holder assembly	CD mechanism holder assembly

Fig.38

Fig.37

MX-K5/MX-K6

<CD mechanism section>

•Removing the CD mechanism holder from the CD chager unit.

(Refer to "Removing the CD mechanism holder assembly" )

Removing the pickup unit. (See Fig.1)

1.Removing the cut washer c on the feed gear sleeve and pull out the feed gear.

2.Remove the two screws A fixing the pickup shaft.

3.Removing the pickup unit.

Removing the motor board. (See Fig.2)

1.Unsolder the motor terminal on the motor board.

2.Remove the moter board.

Removing the feed motor. (See Fig.1)

Remove the two motor fixing screws at B and removing the feed motor.

Removing the spindle motor.

The spindle motor cannot be removed as a single unit. When removing the spindle motor, change the chasis and turntable together as aunit.

A

Motor board

Spindle motor

Shutter	Shaft
Pickup unit

A

					Cut washer
	B
						Feed Gear
				Fig.1

Unsolder Feed motor

Unsolder

Fig.2

1-16

<Cassette mechanism section>

Removing the record/playback mechanism.

Removing the R/P head.

1.Remove the screw A on the right side of the R/P head.(Fig.1, Fig.2)

2.Remove the screw B on the left side of the R/P head.(Fig.1, Fig.2)

Remove the erase head.

Remove the screw C fixing the erase head.(Fig.1)

Removing the pinch roller.

1.Pull out the pinch roller by opening the pinch roller stopper outward to unlock .(Fig.3)

2.When reassembling the pinch roller, refer to fig. 4 to hook up the spring.

MX-K5/MX-K6

R/P Head

		Stoppsr
E. Head	C B	A
		Pinch roller
		assembly

Fig.1

B A

Spring	R/P Head
	Fig.2

Pinch roller

Pinch roller stopper

Fig.3
Pinch roller	Pinch roller
	spring

Return spring

Return spring

Return spring

Fig.4

MX-K5/MX-K6

Removing the motor.

1.Remove the two screws D fixing the motor. Be careful to grease's splash when the drive belt comes off.(Fig.5, Fig.6)

2.Unsolder the motor terminal.(Fig.5)

Removing the mechanism board.

1.Unsolder the four parts a on the solenoid coil terminal.(Fig.5)

2.Remove the two screws E fixing the board.(Fig.5)

3.Unhook the three parts b from the board.(Fig.5)

4.Remove the mechanism board.(Fig.5)

	Mecha.		Motor
			terminal
a	board	b
				E	b
	E		D

	D	a
		Drive belt
	Motor
	Fig.5
	Drive belt (Flat)	Motor

Removing the flywheel.

Remove the cut-washers at c and d from the

capstan shaft, then remove the flywheel. When reassembling the flywheel,

be sure to use new washers as they

cannot be reused.(Fig.8, Fig.9)

Drive belt Fig.6

Capstan

washer

Fig.7

d

c

Sleeve

Sleeve

Washer

FR belt

Flywheel

FR belt Flywheel

Flywheel

Fig.9

Fig.8

Capstan

washer

1-18

3708-000258

3708-000122

Tuner board

					JW1
							0	9
								FCW1
	FCW3						RCW6
		JCW2			JCW1
						Main board
			FCW3					FCW2
						HCW3
0	2					RW1		RW2
9
						9		9
								0
0						0
							9
		00022A-					0
						9
					HCW2
						0
		AH39					AH39-00247A
				E.phone J.board
	0	9			0	Cassette mechanism
		9	0		9
AH39-20002D		8	8		2
							2			0
								0
					0		9	9	0	9
									2	9
							2			0
									8
										8

3809-001228

UCW1 CD key switch board

3809-001224

UCW7

Front key switch board

AH39-00254A

AH39-00249A

Front / Display board	UCW2
UCW3
UCW4

UCW5

UCW6

ACW2

Amp board

ACW1

9

0

0	9	0
		Power transformer
PCW1		RCW2
RFS5
RFS6		RFS2
RFS7
RFS8

connection Wiring

					3809-001121
					AH39-20561P
3809-001185		610				CD mechanism
		-
		502		CW2
	0 9	-				AAN1
		16634	CW3	CW1
CW3		CW102			2
CW101		CW103				9
					0		Color
CW104
						0
CW107				2	0	1 2 3 4 5 6 7 8 9 0	codes
CW106	CW105
9			001034-3809			Brown Red Orange Yellow Green Blue Violet Gray White Black	.belowshownare	K5/MX-MX
0
AH39-20025S
								K6-

MX-K5/MX-K6

Adjustment method

1. Tuner

* Adjustment Location of Tuner PCB

AM(MW) OSC

AM(MW) RF

LW OSC

AM(MW) RF

ITEAM

Adjustment

Adjustment

Adjustment

Adjustment

(Except for J/C)

Received FREQ.

530~1710 KHz

594 KHz

146~290 KHz

150 KHz

Adjustment

MO

MA

LO

LA

point

Output

1~7.0 0.5V

Maximum

2~7.0 0.5V

Maximum

Output(Fig1-4)

Output(Fig1-4)

MAIN

VT

GND

TESTER

PCB

Fig 1-4 OSC Voltage

1-20

FM THD Adjustment

SSG FREQ.

98 MHz

Adjustment

point FM DETECTOR COIL (FM DET)

Output

60 dB

Minumum Distortion (0.4% below) (Figure 1-1)

			MX-K5/MX-K6
Output	FM
	Antenna	SET
GND
	Terminal
FM S.S.G		Input	Oscilloscope
	Speaker
	Terminal	output	Input
		Distortion Meter

Figure1-1 IF CENTER and THD Adjustment

FM Search Level Adjustment

SSG FREQ.	98 MHz
Adjustment	BEACON
point
	SENSITIVITY
(SVR1)	SEMI-VR(20K	)
Output	28 dB( 2dB)
Adjust SVR1 so that "TUNED" of		FL T
is lighted (Figure 1-2)

*Adjust FM S.S.G level to 28dB

AM(MW) I.F Adjustment

SSG FREQ.	450 kHz
Frequency	522 kHz
Adjustment	AM IF
point

Maximum output (Figure 1-3)

	28 dB	FM Antenna
		SET
FM S.S.G	GND	FM IN

20 k

Figure1-2 FM Auto Search Level Adjustment

	60cm
		AM IF
	OUTPUT	AM ANT
		IN
	AM SSG	Speaker Terminal
	450KHZ
	INPUT	OUTPUT
	VTVM	Oscilloscope

Figure1-3 AM I.F Adjustment

MX-K5/MX-K6

2 Cassette Deck

To adjust tape speed

Notes

1) Measuring tape: i) VT-712/MTT-111(or equivalent) (Tapes recorded with 3kHz)

ii)AC-225/MTT-5512(or equivalent)

2)Connect the cassette deck to the frequency counter as in figure 1-5.

Cassette Deck

Frequency Counter

SPK OUT

output

Figure 1-5

Step

Item

Pre-Setup

Pre-Setup

To Adjust

Standard

Remark

Condition

1)

Deck 1:VT-712

OUT

NOR

2)

Press PLAY

1%

1

(connected

Turn VSR1 to

SPEED

SW button

3KHz

range

to the frequency

left and right

Control

3)

Deck 2:Same

(FRONT PCB)

counter)

as above

	Recording /Play head		Oscilloscope
	Cassette Deck	VTVM
	SPK OUT
	(GND)	In Out
	AZIMUTH control screw	Figure 1-7
	Figure 1-6

SET		VTVM	Oscilloscope
(MAIN PCB)
Audio OSC.
LINE OUT
IN	TP
AUX IN	JCW3	IN OUT

Figure 1-8

1-22