Free Audio Service Manuals - Free download Jvc UXJ 60 Service Manual

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UX-J60

SECTION 1
Important Safety Precautions

1.1 Safety Precautions

(1) This design of this product contains special hardware and exposed metal part and a known good earth ground
many circuits and components specially for safety purposes. Measure the AC voltage across the resistor with the AC
For continued protection, no changes should be made to the voltmeter.
original design unless authorized in writing by the man- Move the resistor connection to each exposed metal part,
ufacturer. Replacement parts must be identical to those particularly any exposed metal part having a return path to
used in the original circuits. Services should be per- the chassis, and measure theAC voltage acrossthe resistor.
formed by qualified personnel only. Now, reverse the plug in the AC outlet and repeat each

measurement. Voltage measured any must not exceed 0.75

(2) Alterations of the design or circuitry of the product should ,
VAC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

not be made. Any design alterations of the product should

not be made. Any design alterations or additions will void AC VOLTMETER
the manufacturers warranty and will further relieve the a (Having 1000
. .. . . ohms/volts,

manufacture of responSIbility for personal injury or property or more sensitivity)
damage resulting therefrom. =

(3) Many electrical and mechanical parts in the products have 0315/1 F AC TYPE
special safety-related characteristics. These characteris- -II-| Place this
tics are often not evident from visual inspection nor can the 'WV . , : 23:12: sed
protection afforded by them necessarily 'be obtained by us- 15009 10W metal pg:
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special safety Good earth ground
characteristics are identiﬁed in the Parts List of Service Manu- 1.2 Warning
al. Electrical components having such features are iden-

(1) This equipment has been designed and manufactured to
tified by shading on the schematics and by (A) on the meet international safety standards.

Parts List in the Service Manual. The use of a substitute re-
placement which does not have the same safety character-
istics as the recommended replacement parts shown in the

Parts List of Service Manual may create shock, ﬁre, or oth- (3) Repairs must be made in accordance With the relevant
er hazards. safety standards.

(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.

(4) It is essential that safety critical components are replaced

(4) The leads in the products are routed and dressed with ties.
by approved parts.

clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or (5) If mains voltage selectoris provided, check setting for local
sharp edges for the prevention of electric shock and fire voltage.

hazard. When service is required. the original lead routing 1.3 Caution

and dress should be observed, and it should be confirmed Burrs formed during molding may be left over on some parts
that they have been returned to normal, after reassembling. of the chassis.

(5) Leakage shock hazard testing) Therefore, pay attention to such burrs in the case of pre-

After reassembling the product, always perform an isolation forming repair Of this system.

check on the exposed metal parts of the product (antenna 1-4 Critical parts for safety

terminals, knobs, metal cabinet, SCFBW heads, headphone In regard with component parts appearing on the silk-screen
jack, COhVOI shafts. etc.) to be sure the PTOdUCt is safe to printed side (parts side) of the PWB diagrams, the parts that are
operate without danger Of electrical ShOCk. printed over with black such as the resistor ( - ), diode ( h )
Do not use a line isolation transformer during this check. and ICP (. ) or identiﬁed by the " A " mark nearby are critical

- Plug the AC line cord directly into the AC outlet. Using a for safety.

"Leakage Current Tester", measure the leakage current When replacing them, be sure to use the parts of the same type
from each exposed metal parts of the cabinet. particular- and rating as speciﬁed by the manufacturer. (Except the JC version)
ly any exposed metal part having a return path to the
chassis. to a known good earth ground. Any leakage cur-

rent must not exceed 0.5mA AC (r.m.s.).

- 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 ohm 10W resistor
paralleled by a 0.15 pF AC-type capacitor between an

1-2 (No.22029)

Jvc UXJ 60 Service Manual

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