1.1.2 Safety Check after Servicing
Examine the area surrounding the repaired location for damage(4) Leakage current test
or deterioration. Observe that screws, parts and wires have beenConfirm specified or lower leakage current between earth
returned to original positions, Afterwards, perform the followingground/power cord plug prongs and externally exposed ac-
tests and confirm the specified values in order to verify compli-cessible parts (RF terminals, antenna terminals, video and
ance with safety standards.audio input and output terminals, microphone jacks, ear-
(1) Insulation resistance testphone jacks, etc.).
Confirm the specified insulation resistance or greater be-Measuring Method : (Power ON)Insert load Z between
tween power cord plug prongs and externally exposedearth ground/power cord plug prongs and externally ex-
parts of the set (RF terminals, antenna terminals, video andposed accessible parts. Use an AC voltmeter to measure
audio input and output terminals, microphone jacks, ear-across both terminals of load Z. See Fig.1-1-9 and follow-
phone jacks, etc.).See table 1 below.ing Fig.1-1-12.
(2) Dielectric strength test
Confirm specified dielectric strength or greater between
power cord plug prongs and exposed accessible parts ofab
the set (RF terminals, antenna terminals, video and audioZAc
Externally
input and output terminals, microphone jacks, earphoneexposedV
jacks, etc.). See Fig.1-1-11 below.accessible part
(3) Clearance distanceFig.1-1-9
When replacing primary circuit components, confirm spec-(5) Grounding (Class 1 model only)
ified clearance distance (d), (d') between soldered termi-Confirm specified or lower grounding impedance between
nals, and between terminals and surrounding metallicearth pin in AC inlet and externally exposed accessible
parts. See Fig.1-1-11 below.parts (Video in, Video out, Audio in, Audio out or Fixing
screw etc.).Measuring Method:
d
Connect milli ohm meter between earth pin in AC inlet and
exposed accessible parts. See Fig.1-1-10 and grounding
d'
specifications.
Chassis
Power cord
primary wire
AC inletExposed accessible part
Fig.1-1-8
Earth pin
MIlli ohm meter
Grounding Specifications
RegionGrounding Impedance (Z)
USA & CanadaZ0.1 ohm
Europe & AustraliaZ0.5 ohm
Fig.1-1-10
AC Line VoltageRegionInsulation Resistance (R)Dielectric StrengthClearance Distance (d), (d')
100 VAC 1 kV 1 minuted, d' 3 mm
JapanR 1 M /500 V DC
100 to 240 VAC 1.5 kV 1 minuted, d' 4 mm
110 to 130 VUSA & Canada1 M R 12 M /500 V DCAC 1 kV 1 minuted, d' 3.2 mm
AC 3 kV 1 minuted 4 mm
110 to 130 V(Class )
Europe & AustraliaR 10 M /500 V DCd' 8 mm (Power cord)
200 to 240 VAC 1.5 kV 1 minute
(Class )d' 6 mm (Primary wire)
Fig.1-1-11
AC Line VoltageRegionLoad ZLeakage Current (i)a, b, c
100 VJapani 1 mA rmsExposed accessible parts
1
0.15
110 to 130 VUSA & Canadai 0.5 mA rmsExposed accessible parts
1.5
i 0.7 mA peak
Antenna earth terminals
110 to 130 V2i 2 mA dc
Europe & Australia
220 to 240 Vi 0.7 mA peak
Other terminals
50i 2 mA dc
Fig.1-1-12
NOTE :
These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
1-4 (No.YD006) |
ACEC
JVC
