Jvc MXS 6 MD Service Manual

Page 1

JVC

SERVICE MANUAL

COMPACT COMPONENT MD SYSTEM

MX-S6MD

MDLP

Mfillfilfl
DHEE

COM PACT

@DSIB

DIGITAL AUDIO

My.

1y:

(0 0)
SP-MXSGMD CA-MXSGMD SP-MXSGMD
Area Suffix
US ----------- Singapore
UB -------- Hong Kong
UT --------------- Taiwan
Contents
Safety Precautions ---------------------- 1-2 Maintenace of laser pickup (MD) ----=l--38
Preventing static electricity ------------- 1-3 Replacement of laser pickup (MD) 1-38
Important for laser products ----------- 1-4 Flow of functional operation
Disassembly method -------------------- 1-5 until TOC read (CD section) ---------- 1-39
Adjustment method ---------------------- 1-31 Maintenance of laser pickup (CD) ----- 1-40
Flow of functional operation Replacement of laser pickup (CD) 1-40
until TOC read (MD section) --------- 1-37 Description of major ICS ----------------- 1-40~69
No.20887
COPYRIGHT (c) 2000 VICTOR COMPANY OF JAPAN, LTD.

Nov. 2000

Page 2

MX-S6MD

-Safety Precautions
1 .

2.

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.

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.

.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 (A) 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.

.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.

.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.

0 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 areturn path to the chassis, to a known good earth ground. Any leakage
current must not exceed 0.5mA AC (r.m.s.)

0 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 1,5009 10W resistor paralleled by
a 0.15uF AC-type capacitor between an exposed

AC VOLTMETER
metal part and a known good earth ground. (Having 1000
Measure the AC voltage across the resistor with the 7 ohms/volts,
AC voltmeter. or more sensitivity)
Move the resistor connection to eachexposed metal ° °
part, particularly any exposed metal part having a (115): AC TYPE
return path to the chassis, and meausre the AC .
voltage across the resistor. Now, reverse the plug in -II- 3322:?
the AC outlet and repeat each measurement. voltage 'WV > each exposed
measured Any must not exceed 0.75V AC (r.m.s.). 15009 10W metal part.

This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground

- Warning
1.
2.
3.
4.
5.

This equipment has been designed and manufactured to meet international safety standards.

It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
Repairs must be made in accordance with the relevant safety standards.

It is essential that safety critical components are replaced by approved parts.

If mains voltage selector is provided, check setting for local voltage.

A 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.

Page 21

MX-SGMD

8. Reattach the UD base while engaging the four pins
on both sides of the UD base to the notches of the
loading mechanism base and placing the edge
(marked 9) of the cartridge holder assembly under
the hook e of the loading mechanism base. (Fig.23)

9. Reattach the slide base (R) while fitting the two pins
on another side of the U0 base to the slots of the
slide base (R). (Fig.24)

ATTENTION: Fit the part v of the slide base (R) to
the part w on the inward side of the
cam gear rib. (Fig.25)

10. Reattach the slide base (L) on the slide base (R)
while fitting the two pins on another side of the UD
base to the slots of the slide base (L) (Fig.25). Make

sure the two slots of the slide base (L) are fitted to Loading mechanism base
the two bosses marked E and tighten the two Fig 23
screws E. (Fig.26) '
Ref: To expedite the work, bring up the U0 base Slide base (R)

slightly when fitting each pin to the appropriate

notch.

Fig.24
Slide base (R) E' Slide base (L)
Slide base (Ft)

Fig.26

1-21

Page 29

MX-SGMD

Ornament grille Tweeter

Information

This is a method of dis assembly.

As parts of the repair of this speaker

system, it is only the speaker box assemblies.
It is not possible to supply with each part unit.

Woofer
Boss

' Prior to performing the following procedure, remove
the front grille.

l Removing the speaker (woofer)
(See Fig.1,3 to 5)

1.|nsert a screwdriver under the ornament grille
attached to the woofer.

Boss
2. Pull out the ornament grille with each boss by means

of a lever as shown in Fig.2. Ornament grille

Fig.1

ATTENTION: As the ornament grille is damaged,
replace it with the woofer.

Boss

Ornament grille

ATTENTION: When replacing the ornament grille,
make sure the boss with adequate
amount of bond.

3. Remove the four screws A and the woofer from the
body. Disconnect the wire from the speaker
terminals.

Woofer

Fig.2

Boss x 4

Fig.3

1 -29