FUNAI 23C-250, Service Manual

Page: 5 / 78

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
≥
3mm(d)
≥
6 mm(d’)
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.
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
Fig. 2
Table 2 : Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
One side of power cord plug
prongs (B) to:
230 V
2k
Ω
RES.
Connected in
parallel
i
≤
0.7mA AC Peak
i
≤
2mA DC
RF or
Antenna terminals
50k
Ω
RES.
Connected in
parallel
i
≤
0.7mA AC Peak
i
≤
2mA DC
A/V Input, Output
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
Chassis or Secondary Conductor
d d'
Primary Circuit Terminals
Fig. 1
1-2-2 H8740SFP