Safety Check After Servicing - Denon DVD-1720/556 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 specified
values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between soldered
terminals, and between terminals and surrounding metallic
parts. (See Fig. 1)
Table 1: Ratings for selected area
AC Line Voltage Clearance Distance (d), (d')
120 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 terminals, 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
0.15 µF CAP. & 1.5 kΩ RES.
120 V
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
≥ 3.2 mm (0.126 inches)
Load Z
Connected in parallel
Chassis or Secondary Conductor
Primary Circuit Terminals
d'
Exposed Accessible Part
Z
Earth Ground
B
Power Cord Plug Prongs
Leakage Current (i)
i ≤ 0.5 mA Peak
6
DVD-1720/556
d
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
Earth Ground (B) to:
Exposed accessible parts