JVC DR-MV2SEU, Service Manual

Page: 4 / 99

1-4 (No.YD087)
1.1.3 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 fol-
lowing tests and confirm the specified values to verify compli-
ance with safety standards.
1.1.3.1 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
Note:
This table is unofficial and for reference only.
Be sure to confirm the precise values.
Fig.1
1.1.3.2 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 au-
dio input and output terminals, microphone jacks, earphone
jacks, etc.) is lower than or equal to the specified value in the ta-
ble 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 fol-
lowing table.
Fig.2
Table 2: Leakage current ratings for selected areas
Note:
This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Volt age Clear ance Dist ance (d), (d’)
220 to 240 V
3 mm(d)
6 mm(d’)
Chassis or Secondary Conductor
d d'
Primary Circuit Terminals
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
AC Line Volta ge Loa d Z Leakage Cur rent (i)
One side of po wer cord plug
prongs (B) to:
220 to 240 V
2k RES.
Connected in
parallel
i 0.7mA AC Peak
i 2mA DC
RF or
Antenna terminals
50k RES.
Connected in
parallel
i 0.7mA AC Peak
i 2mA DC
A/V Input, Output