Jvc MXD 451 TR Service Manual

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MX-D451TR

JVB
SERVICE MANUAL

MX-D451TR mama/w
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DIGITAL AUDIO

Area Suffix

This Service manual have not "Instructions "." Location of B ................................... U.K.
main Parts "," Out line of Main IC "." Analytic Drawing tor E ____________ Continental Europe
CD traverse mechanism and Cassette mechanism etc. ", EN North Europe
" Block Diagram " and so on.These items should be used in G IIIIIIIIIIII Germany
conjunction with service manual for MX-DSStTFt all version VX .............. Eastern Europe
(Issue No.10056).
Contents
1.8afety Precautions ....................................... Paget-1 8.Wiring Connections ......................................... 8-1
2Safety Precaution about MX-D451TR ................... 2-1 Q'Anawtic Drawing and Parts List _________________ 9.1 ~2
3.|nstructions -------------------------- 3'1 10.8tandard Schematic Diagrams .............. 10-1~1O
4.Location of Main Parts... ..... 4-1 11.Location of P.C.Board Parts ,.,.11-1N3
5.Ftemova| of Main parts ................................... 5-1 ~15 12.Eiectrical Parts List ___________ 12.14;
GMain Adjustment ............................................... 6-1~4 13.Packing ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 13.1~2
7.0ut Line of Main IC ............................................... 7-1
COPYRIGHT (c) 1997 VICTOR COMPANY OF JAPAN, LTD. No'10057

August 1997

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MX-D451TR
1.Safety Precautions

.The design 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. Service 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 manufactures 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 product have special safety- related characteristics. These characteristics are oiten not
evident from visual inspection norcan 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 ( A )on the schematic diagram and parts list in the
service manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended
replacement part 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 pans. high
temperature parts, mpving 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
reassembling,

5. Leakage current check (Electrical shock hazard testing)

After res 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 aLeakage current tester". measure the leakage current from each exposed
metal part of the cabinet, particulary any exposed metal part having a return path to the chassis. to a known good earth ground. Any
leakage current must not exposeed 0.5mA AC(r.m.s.)

~ Alternate check method

d - . . Ac lt AC VOLTMETER
Plug the AC line cor directly into the AC outlet Use an vo meter EB (Having 1000 ohms/volt,
having 1,000 ohms per volt or more sensitivity in the following manner. or more sensitivity.)
Connect a 1.500 ohms 10W resistor paralleled by a 0.15 ,u F AC type 41-3-
capacitor between an exposed metal part and a known good earth 0.15;: AC TYPE
' ground. Measure the AC Voltage across the resistor with the AC '

Place this probe

voltmeter. Move the resistor connection to each exposed metal part. w on each uxposed
1500 n. 10 W metal part.

particularly any exposed metal part having a return path to the chassis,
and measure the AC voltage across the resistor. Now. reverse the plug Good earth ground

in the AC outlet and repeat each measurement. Any voltage measured

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 maintaintaind.
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.

g i 5 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 preformlng repair of this system.

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MX-D451TR |\
11.Location of P.C.Board Parts

1 | 2 | 3 I 4 | 5

I Main Amplifier Board : Block No.-