Safety Check After Servicing - AEG VCR 4500 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 posi-
tions. Afterwards, do the following tests and confirm
the specified 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 - 240 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
between B (earth ground, power cord plug prongs)
and externally exposed accessible parts (RF termi-
nals, antenna terminals, video and audio input and
output terminals, 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
230 - 240 V
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
Connected in
parallel
50kΩ RES.
i≤0.7mA AC Peak
Connected in
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
i≤2mA DC
i≤2mA DC
1-2-2
d
AC Voltmeter
(High Impedance)
prongs (B) to:
RF or
Antenna terminals
A/V Input, Output
Fig. 1
Fig. 2
U29PSFP