Jvc MXDVB 10 Service Manual

Page 2

MX-DVBiO

-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 (Q) 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 current 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 a return
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 1,500 Q 10W resistor paralleled by a 0.1511 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 AC a (HavingiOOO
vo|tmeter_ ohms/volts, .. .
Move the resistor connection to each exposed metal part, a c (more sens't'v'ty)
particularly any exposed metal part having a return path to

the chassis, and measure the AC voltage across the resistor. 015: AC TYPE

Now, reverse plug in the AC outlet and repeat each ' Slagethés
I'O eo
measurement.Voltage measured any must not exceed 0.75V Wt . eachexposed

AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 15009 10W metal part.

Good earth ground

- Warning

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.This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may
2. it is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the

A CAUTION

chassis. Therefore, pay attention to
such burrs in the case of
preforming repair of this system.

mark nearby are critical for safety.
(This regulation does not correspond to J and C version.)

In regard with component parts appearing on the silkscreen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor (I), diode (-) and ICP (Q) or identified by the "A"

Page 5

MX-DVB10

Important for laser products

1. CLASS 1 LASER PRODUCT 5.CAUTION : If safety switches malfunction, the laser is able
2. DANGER : Invisible laser radiation when open and inter to function.
lock failed or defeated. Avoid direct exposure to beam. 6.CAUTION : Use of controls, adjustments or performance of
3. CAUTION : There are no serviceable parts inside the procedures other than those specified herein may result in
Laser Unit. Do not disassemble the Laser Unit. Replace hazardous radiation exposure.

the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laser
radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open

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

in case of an adjustment or operation
and the safety interlocks have failed or are defeated. It is check.

dangerous to defeat the safety switches.

VARNING : Osynlig laserstralning ar denna del ar oppnad ADVARSEL : Usynlig laserstraling ved abning , nar
och sparren ar urkopplad. Betrakta ej stralen. sikkerhedsafbrydere er ude af funktion. Undga
VARO : Avattaessa ja suojalukitus ohitettaessa olet udsaettelse for straling.
alttiina nakymattomalle lasersateilyllefila katso ADVARSEL : Usynlig laserstraling ved apning,nar
sateeseen. sikkerhetsbryteren er avslott. unnga utsettelse
for straling.

REPRODUCTION AND POSITION OF LABELS

CLASS1

LASER PRODUCT WARN'NG LABEL
.............. W...W.....
M......... WWW...

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Page 60

MX-DVB10

ILC75342M-X (IC522, IC523) : E. volume
1. Pin layout

16

CONTROL
CIRCUIT

LOGIC
CIRCUIT

CONTROL
CIRCUIT

3. Pin function

CCB
INTERFACE

RVret

5': Symbol Function :1: Symbol Function
1 DI Serial data and clock input for 10 control 17 R1 Input signal connections
2 CE Chip enable 18 R2 Input signal connections
3 VSS Connect to GND 19 R3 Input signal connections, not used
4 TEST Electric volume connection for test 20 R4 Not used
5 LOUT Volume control and equalizer input 21 RSELO Input selector output
6 LBASSZ Connection for resistor and capacitor that 22 RIN Volume control and equalizer input
7 LBASS1 from the pass band filter 23 RTRE Connection for capacitor that from the treble
8 LTRE Connection for capacitor that from the band filter
treble band filter 24 RBASSt Connection for resistor and capacitor that from
9 UN Volume control and equalizer input 25 RBASSZ the bass band filter
10 LSELO Input selector output 26 ROUT Volume control and equalizer input
11 L4 Not used 27 NC Not used
12 L3 Input signal connections, not used 28 VREF Connection to the 0.5X VDD voltage generator
13 L2 Input signal connections circuit used as the analog signal ground
14 L1 Input signal connections 29 VDD Power supply
15 NC Connect to GND 30 CL Serial data and clock input for 10 control
16 NC Connect to GND

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