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1. This design of this product contains special hardware and many circuits and components specially or
safety purposes. For continued protection, no changes should be made to the original design unless
authorizedinwritingbythemanufacturer. Replacementpartsmustbeidenticaltothoseusedinthe original
circuits.Services should be performedby qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the
productshould not be made.Anydesign alterationsor additionswill void the manufacturer`s warranty and
willfurtherrelievethe manufactureofresponsibilityforpersonalinjuryorpropertydamageresultingtherefrom.
3. Many electrical and mechanical parts in the products 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.
Replacementparts which have these specialsafety characteristics are identified in the Parts List ofService
Manual. Electrical components having such features are identified by shading on the schematics and by
( !)on the Parts Listin the Service Manual.The useof a substitute replacementwhich does not havethe
same safety characteristics as the recommended replacement parts 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
separatedfrom liveparts, 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
beobserved, anditshould be confirmed that they have beenreturnedto normal, after re-assembling.
5. Leakage currnet 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.
lPlug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester ”, measure the
leakage current from each exposed metal parts 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 0.5mA AC (r.m.s.)
lAlternatecheck method
Plug theAC line cord directly into theAC outlet. Use anAC voltmeter having, 1,000 ohms per volt
ormore sensitivityin thefollowingmanner.Connect
a 1,500
10W resistor paralleled by a 0.15
F
AC-type capacitor between an exposed metal
partanda known good earth ground. Measure the
AC voltage across the resistor with the AC
voltmeter.
Movetheresistorconnectionto eachexposedmetal
part, particularly any exposed metal part having a
return path to the chassis, and meausre the AC
voltageacrosstheresistor.Now,reverse the plug in
theACoutletandrepeateachmeasurement.Voltage
measuredAnymustnotexceed0.75V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the
“!”mark nearby are critical for safety.
When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the J and C version)
Safety Precautions
!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
preforming repair of this system.
Warning
1.Thisequipmenthasbeendesignedandmanufacturedtomeetinternationalsafetystandards.
2.Itisthelegalresponsibilityoftherepairertoensure thatthesesafetystandardsaremaintained.
3.Repairsmustbemadeinaccordance withtherelevantsafetystandards.
4.Itisessentialthatsafetycriticalcomponentsarereplacedbyapprovedparts.
5.Ifmainsvoltageselectorisprovided,check settingforlocalvoltage.
