Sylvania 6842PF M 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 (any two parts or contacts, between any part
or contact and either pole of the 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.) is lower than or equal to the specified val-
ue in the table below.
Measuring Method: (Power ON)
Insert load Z between B (any two parts or contacts,
between any part or contact and either pole of the
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 RES. connected in
parallel
Chassis or Secondary Conductor
Primary Circuit Terminals
d'
Exposed Accessible Metal Part
Z
1.5kΩ
0.15µF
One of Power Cord
B
Plug Prongs
Leakage Current (i)
i≤0.75mA peaks
1-2-4
d
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
Earth Ground (B) to:
Exposed accessible
parts
L0604IMP