Jvc RXR 85 BK Service Manual

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RX-RSSBK I
RX-RBsXBK l

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RX'R85 BK (for the USA)
MODEL No. RX'RSSXBKON Canada)

Note:RX-R855K and RX-RBSXBK are completely same in their structure, except for their outlook colors.

Contents

Safety Precautions -------------------------------------- 1-2 Internal Block Diagrams

Instruction Book ------------------------------ --1-3 of the FL Display Tube --------------------------- 131
Technical Explanation - 1-19 Remote Control Unit (RM-SRSSU) ------------- 1-32
Block Diagrams ............................... ..1.2() Schematic Diagrams -~lnsertion
FM/AM Tuner Alignment Procedures --l-22 Printed Circuit Boards--~ -------------------- Insertion
Removal Procedures ------------------------------- --1-23 Connecting Diagram -------------------- Insertion
Description of ICs ------------------------------------------ 124 Parts List -------------------- Separate-Volume Insertion

No. 201 37

Dec. 1 989

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rut-noon
RX-R85XBK

- Safety Precautions

1.

The 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. Service
should be performed by qualified personnel only.

. Alternations of the design orcircuitry 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 manufacturer's 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 (lb)
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 part 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 current check (Electric 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
sensitivity in the following manner. Connect a 1,500 n 10 W resistor paralleled by a 0.15 F AC-type
capacitor between an exposed metal part and
a known good earth ground.

Measure the AC voltage across the resistor with @ (AHC YOL'EISCEEERh / I
aVll'Ig 0 ms V0 t,
the AC VORmFter' _ or more sensitivity.)
Move the resrstor connection to each exposed
, o c

metal part, particularly any exposed metal part -J

. . I5 ur AC TYPE
havmg a return path to the chassrs, and measure
the AC voltage across the resistor. Now, reverse

o

Place this probe

the plug in the AC outlet and repeat each W» on each exposed
measurement. Any voltage measured must not 500 0 "'6? part.
exceed 0.75 V AC lr.m.s). This corresponds to Good 93m, ground

05 mA AC (r.m.s).

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-V\Iarning

. This equipment has been designed and manufactured to meet international safety standards.
, It is 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.

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