Jvc AXR 551 BK Service Manual

Page 1

AX RESIBK

JVI:
ERVICE MANUAL

mom No. AX-R551 BK

Contents

Page Page
Safety Precaulions... 1-2 Internal Block Diagramms of IC.. . l-33
SpecifiCations ..... 1-3 Schematic Diagrams. Insertion
Instruction Book .. 1-4 Remoie Control Unit.. lnserfion
Removal Procedures.... .. 1-30 Block Diagram ........ Insertion
Adjustment Procedures.. .. 1-31 Connection Diagraml Insertion
Explanation of LSI ........................................................ 1-32 Parts List ................................ Separate Volume Insertion

No. 20016

Feb. 1988

Page 2

AX-R551BK

-Safety Precautions

1

. The design of this product contains special hardware and may 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 per-
formed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product

5"

should not be made. Any design alterations or additions will void the manufacturers warranty and will further
relieve the manufacturer 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 shading on the schematics and by (A ) on the Parts List in the Service Manual. The use of a sub-
stitute 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, 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 part 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 0.5 mA 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 sensi-
tivity in the following manner. Connect a 1,500 0 low resistor paralleled by a 0.15/1F AC-type capacitor be
tween an exposed metal part and a known good earth ground.

Measure the AC voltage across the resistor with the AC VOLTMETER
AC voltmeter. @ (Having 1000 ohms/volt,

_ , or more sensntivrty.)
Move the resustor connection to each exposed metal
part, particularly any exposed metal part having a __cl
return path to the chassis, and measure the AC volt- ms; ac TYPE
age across the resistor. Now, reverse the plug in the Place this probe
AC outlet and repeat each measurement. Any voltage «v. on each exposed
measured must not exceed 0.75 VAC (r.m.s.). This isoon row metal part.
corresponds to 0.5 mA AC (r.m.s.).

m

Good earth ground

-Warning

(Jl-Ih(o~)l\1d

. 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.

1-2

(No. 20016)

Page 48

AX-R551BK

Main Parts Locations

I Front View
E304557-002
Window Screen

E72808-001
Push Button

E304407-002
Volume Knob Ass'y

E74478-001
Knob

E73835-001

QMSGA40-021---
Headphone Jack I
E73835»001

Push Button Push Button

E74478-001 525555-001 E304556-001
Knob E304556-001 PUS" 5"0 Push Button

Push Bunon

See page 2-4

Power Transformer fl: ENHJ 1 l E!

Power Amplifier
PC Board Assy

ENE-048 El
Analog Switch &
Pin Jack

PC Board Ass'y

See page 2-4
Power Transformer £3

END-O46 C]
Primary PC Board Ass'y

I Rear View

OMS3533-OO1 See Page 2-4
Mini Jack Rear Panel

E70078-001
GND Terminal ,
.

EMNooTv-405A---i .

4P Pin Jack I --<
EMNOOTV-402A-« See page 2-4
4P Pin Jack I" Ac Outlet 1;
EMNoorv.602A-- See 2-4

. page
6P Pln Jack Cord Stopper A

See page 24
Power Cord

EMNOOTV-GOZA EMBOOTP-801C
6P Pin Jack Speaker Terminal

&: Safety Parts

2-2 (No. 20016)

Page 63

Accessories List

AX-R551BK

A Item Part Number Part Name Q'ty Description Areas
E30580-1447C Instruction Book 1 J.C
E30580-1464A Instruction Book 1 E,AIG,P,PG.U
E30580-1464ABS Instruction Book 1 BS
BTZOOZSJ Warranty Card 1 for Australia C
BT20029C Warranty Card 1 A
BT2004BB Warranty Card J.P,PG
BT20060 Warranty Card 1 BS
ETZOOGA Warranty Card 1 G
BT20098 Warranty Card 1 for New Zealand A
BT20046C Service Infomation Card 1 J,P,PG
BT20071A Service Center List 1 C
BTZOOME Safety Instruction Sheet 1 J
BTZODGG EEC Agency 1 6,85
RM»SA551 Remote Control Unit 1
UM-3(DJ) Baterry 1

A E04056 Siemens Plug 1 PG,U

A EMCOZOl-OOlBS AC Plug 1 BS
E67142-T3R15 Fuse Lavel 1 for Fuse P
E67142-T6R3 Fuse Lavel I for Fuse PG,U

A QMFSIAZ<3R1SS Fuse 1 P

A QMF51A276R3S Fuse 1 PG,U
EMZOZ-Z Envelope 1 for Instruction Book Except for BS
E41202-ZBS Envelope 1 for Instruction Book BS
E66416-003 Envelope 1 for Warranty Card I
E6581-4 Envelope 1 for Fuse P,PG,U
E35497-013 Caution Sheet 1 P
E354977015 Caution Sheet 1 PG,U

The Marks for Designated Areas
J.... .......... °~U.S.A. G .............. West Germany
C" ~Canada --U.Ku

U.S.Military Market
Other Countries

No mark indicates all areas.

(No. 20016)

2-17