JVC CX-60ME User Manual

CX-60ME
1. SAFETY PRECAUTION
1. The design of this product contains special hardware, 8. ISOLATION CHECK
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 receiver 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 television sets
have special safety-related characteristics. These char-
acteristics 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 ( /\_)'on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the recom-
mended replacement part shown in the parts list in
Service manual may create shock, fire, or other hazards.
. If any repair has been made to the chassis, it is recom-
mended that the B, setting should be checked or ad-
justed. (See ADJUSTMENT OF POWER SUPPLY).
. The high voltage applied to the picture tube must con-
form with that specified in Service manual. Excessive
high voltage can cause an increase in X-Ray emission,
arcing and possible component damage, therefore opera-
tion under excessive high voltage conditions should be
kept to a minimum, or should be prevented. If severe
arcing occurs, remove the AC power immediately and
determine the cause by visual inspection (incorrect
installation, cracked or melted high voltage harness, poor
soldering, etc.). To maintain the proper minimum level
of soft X-Ray emission, components in the high voltage
circuitry including the picture tube must be the exact
replacements or alternatives approvided by the manu-
facturer of the complete product.
. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VT VM. Dis-
charge the picture tube before attempting meter connec-
tion, by connecting a clip Jead to the ground frame and
connecting the other end of the lead through a 10kQ2 2W
resistor to the anode button.
. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short
circuit has occurred, those components that indicate
evidence of overheating should be replaced. Always use
the manufacturer's replacement components.
2 (No. 5513)
(SAFETY FOR ELECTRICAL SHOCK HAZARD)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, channel selector knobs, metal
cabinet, screwheads, earphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger
of electrical shock.
(1) DIELECTRIC STRENGTH TEST
The isolation between the AC primary circuit and
all metal parts exposed to the user, particularly any
exposed metal part having a return path to the
chassis should withstand a voltage of 3,000V
AC (r.m.s.) for a period of one second.
seen withstand a voltage of 1,100V AC (r.m.s.) to
an appliance rated up to 120V, and 3,000V AC
(r.m.s.) to an appliance rated 200V or more, for a
period of one second.
This method of test requires a test equipment not
generally found in the service trade.
(2) LEAKAGE CURRENT CHECK
Plug the AC line cord directly into the AC outlet
(do not use a line isolation transformer during this
check.) 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 (water pipe, etc.). Any leakage current
must not exceed 0.5mA AC (r.m.s.).
@ ALTERNATE CHECK METHOD
Plug the AC line cord directly into the AC outlet
(do not use a line isolation transformer during this
check.). Use an AC voltmeter having 1,000 ohms
per volt or more sensitivity in the following manner.
Connect a 150022 10W resistor paralleled by a
0.15uF AC-type: capacitor between an exposed
metal part and a known good earth ground (water
pipe, etc.).
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each exposed 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 in
the AC outlet and repeat each measurement. Any
voltage measured must not exceed 0.35V AC (r.m.s.).
This corresponds to 0.5mA AC (r.m.s.).
AC VOLTMETER
(HAVING 10002/V,
OR MORE SENSITIVITY)
0.15uF AC-TYPE
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
15002 10W
GOOD EARTH GROUND
Fig. 1-1

JVC CX-60ME Specifications

General

Brand	JVC
Model	CX-60ME
Category	TV
Language	English