Jvc MXGA 77 Service Manual

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MX-GA77

JVB

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-GA77 B ....... ': t?:ijfi*___.U.K.

E Continental Europe
EN ----- Northern Europe
EV ------- Eastern Europe

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DIGITAL AUDIO

@ R-D-S

SP-MXGA77 CA-MXGA77 SP-MXGA77

Contents

Safety Precautions ----------------------- 1-2 Flow of functional operation

Important for laser produbts ------------ 1-4 until TOC read .......... 1_24

Preventing static electricity ------------- 1-5 Maintenance of laser pickup ............. 1-25

Disassembly method """""""" 1-6 Replacement of laser pickup - 1-25

Wiring connection ------------------- 1-19 Trouble shooting ---------------------------- 1'26

Adjustment method """""""""""" 1-20 Description of major le ------------------ 1-30~44
No.22083

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. Ju|_ 2003

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MX-GA77

-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.

. 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 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 E (Having1000
voltmeter. ohms/volts, .. .
Move the resistor connection to each exposed metal part, :- c ormore senSItIVIty)
particularly any exposed metal part having a return path to

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

Now, reverse the plug in the AC outlet and repeat each -| Place this
measurement. Voltage measured any must not exceed 0.75 V Wt: , 22323205611

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

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.

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.

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

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 (I), diode (-) and ICP (Q) or identified by the "A"

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Contents

Location of the Buttons and Controls
Front Panel .......
Remote Control

Getting Started .
Unpacking .
Putting the Batteries into the Remote Control .
Connecting Antennas .
Connecting Speakers ..
Connecting Other Equipment
Canceling the Display Demonstration

Common Operations
Turning On or Off the Power ..
Saving the Power Consumption While on Standby

-ECO Mode .1
Setting the Clock .
Selecting the Sources
Adjusting the Volume .
Reinforcing the Bass Sound .1
Enjoying the Heavy Sound
Selecting the Sound Modes
Turning On or Off the Key-touch Tone ..

Listening to the Radio
Tuning in to a Station-Auto Search .1
Presetting Stations ...............................
Tuning in to a Preset Station

Receiving FM Stations with RDS

\DWOOOGQOGOCNUIWM

Changing the RDS Information .............................. 13
Searching for Programs by PTY Codes

(PTY Search) .
Switching Temporarily to a Program Type

of Your Choice .................................................... 14

Playing Back CDS

Loading CDs
Playing Back CDs-All Disc and One Disc . 15
Basic CD Operations ....................... . 17
Changing the MP3 Playback Mode l 19

Turning On or Off the Resume Play for MP3 Disc .. 19
Programming the Playing Order of the Tracks

-Progra.m Play .........................

Playing at Random-Random Play

Repeating Tracks or CDs-Repeat Play

Prohibiting Disc Ejection-Carrousel Lock .

Playing Back Tapes

Playing Back a Tape

Recording

Recording a Tape on Deck B .

Dubbing Tapes .......................

CD Synchronized Recording ..................................... 24

Using the Timers 25

Using Daily Timer ..........

Using Recording Timer ..

Using Sleep Timer

Timer Priority

Maintenance

Additional Information

Troubleshooting ..

Specifications

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