Safety Check After Servicing - FUNAI 23C-250 Service Manual

Safety Check after Servicing

Examine the area surrounding the repaired location for
damage or deterioration. Observe that screws, parts,
and wires have been returned to their original positions.
Afterwards, do the following tests and confirm the speci-
fied values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
AC Line Voltage Clearance Distance (d) (d')
230 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current be-
tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, an-
tenna terminals, video and audio input and output ter-
minals, microphone jacks, earphone jacks, etc.) is lower
than or equal to the specified value in the table below.
Measuring Method (Power ON) :
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use an AC
voltmeter to measure across the terminals of load Z.
See Fig. 2 and the following table.
Table 2 : Leakage current ratings for selected areas
AC Line Voltage
Connected in
230 V
Connected in
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
≥ 3mm(d)
≥ 6 mm(d')
Load Z Leakage Current (i)
2kΩ RES.
i≤0.7mA AC Peak
i≤2mA DC
parallel
50kΩ RES.
i≤0.7mA AC Peak
i≤2mA DC
parallel
Chassis or Secondary Conductor
Primary Circuit Terminals
d'
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
One side of power cord plug
prongs (B) to:
RF or
Antenna terminals
A/V Input, Output
1-2-2
d
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
H8740SFP