Jvc MXD 551 TR Service Manual

Page 1

MX-0551TR

JVD
SERVICE MANUAL

MX-D551TR WWW
@figfi

DIGITAL AUDIO
:23:
g Area Suffix
fig; B ................................. U.K.

E .....

....Continental Europe
...... North Europe
............. Germany
VX ............... Eastern Europe

Contents

1.Safety Precautions ...................................... Page1-1 8.Wiring Connections ......................

2.8%er Precaution about MX-D551TR .................. 2-1 9_Analyfic Drawing and Parts List 9-1~6
3.Instructions ..................... 3-1~18 1o.Block Diagram .......................... 10-1
4.Location 0f Main Parts... ------ 4'1~2 11.Standard Schematic Diagram. 11-1~10

5.Ftemoval of Main parts...
6.Main Adjustment ......
7.0ut Line of Main IC

5-1~17 12.LocationofP.C.Board Parts ...............
--6-1~4 13.Electrical Parts List
....... 7-1 14.Packing

13-1~15

No.1 0056

COPYRIGHT © 1997 VICTOR COMPANY OF JAPAN, LTD.
August 1 997

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iMX-D551TR i

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.

. 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.

. Many electrical and mechanical parts in the product 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 ( 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 parts. 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.

. 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.

~ 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

- . ~ A . AC V0 LTMETER
Plug the AC line cord directly into the C outlet Use an AC voltmeter m (Having lOClO ohms/volt,
having 1.000 ohms per volt or more sensitivity in the following manner. or more senxltlvlth
Connect a 1,500 ohms 10W resistor paralleled by a 0.15 [1 F AC type a
capacitor between an exposed metal part and a known good earth 0.15 uF AC TYPE
ground. Measure the AC voltage across the resistor with the AC "
Place this probe
on Inch cxposod

voltmetert Move the resistor connection to each exposed metal part,
1500, n to 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 9-"?I ground

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

Warning

t. 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 smndards 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 pans.

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 preformlng repair of this system.

Page 35

MX-D551TFI

I Removing the CD mechanism
assembly (See Fig. 5-44) Cams R132 assembly-

1. While turning the cams R1 and R2 assembly in the
arrow direction H", align the shaft "l" of the CD
mechanism assembly to the position shown in Fig. 544.

2, Remove the four screws © retaining the CD mechanism
assembly (See Fig. 5-44).

I Removing the CD mechanism
(See Figs. 5745 and 5- 46)

1. For dismounting only the CD mechanism without
removing the CD mechanism assembly, align the shaft
J" of the CD mechanism assembly to the position
shown in Fig. 5- 45 while turning the cam R1 and H2
assembly in the arrow direction "K".

2. By raising the CD mechanism assembly in the arrow
direction L", remove the assembly from the lifter unit
(Fig. 546),

Cam R1, R2 assembly

I Removing the CD pickup unit
(See Fig.5-47)

1. Move the cam gear in the arrow direction @. Then. the
CD pickup unit will be moved in the arrow direction 6).

2. According to the above step, shift the CD pickup unit to
the center positior (See Figs-47).

3. While pressing the stopper retaining the shaft in the
arrow direction ©, pull out the shaft in the arrow
direction © (See Fig.5-47).

Stopper Stopper 4. After dismounting the shaft from the CD pickup unit,

Fig.5-47 remove the CD pickup unit.

5-12