Emerson SC319C Service Manual page 9

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 original posi-
tions. Afterwards, perform the following tests and con-
firm the specified values in order 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 Region
USA or
110 to 130 V
CANADA
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,
antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.).
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 both terminals of
load Z. See Fig. 2 and following table.
Table 2 : Leakage current ratings for selected areas
AC Line Voltage
110 to 130 V
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
Clearance
Distance (d) (d')
≥ 3.2 mm
(0.126 inches)
Region Load Z
0.15µF CAP. & 1.5kΩ
USA or
RES. connected in
CANADA
parallel
Chassis or Secondary Conductor
Primary Circuit Terminals
d'
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
Leakage Current (i)
i≤0.5mA rms
1-2-4
d
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
Earth Ground (B) to:
Exposed accessible
parts
SFTY_2