−
2
−
SAFETY PRECAUTIONS
WARNING:
Service should not be attempted by anyone unfamiliar with the necessary precautions for this recording or playback
equipment. The following precautions are necessary during servicing:
1.
Many electrical and mechanical parts in this recorder have
special safety-related characteristics for providing protec-
tion against shock, fire and other hazards. These charac-
teristics often go unnoticed in a visual inspection, and the
protection afforded by them cannot necessarily be ob-
tained by using replacement components with higher rat-
ings (voltage, wattage, etc.).
2.
Replacement parts having special safety-related charac-
teristics are identified in this manual, and in the schematic
diagrams, by the symbol ! . These components have
values that are of special significance to product safety.
Should any component (identified by the symbol ) need
to be replaced, use only the part designated in the parts
List. Do not deviate from the specified resistance, wattage,
and voltage ratings.
3.
Before returning the set to the customer, always perform an
AC leakage current check on the exposed metallic parts of
the cabinet, such as terminals, screwheads, metal over-
lays, etc. to be sure that the set is safe to operate without the
danger of electrical shock, Plug the AC line cord directly into
a 120 V AC outlet. (Do not use a line isolation transformer
during this check.) Use an AC voltmeter with a sensitivity of
5000 ohms per volt (or more) as follows: Connect a 1500
ohms, 10 watt resistor, paralleled by a 0.15 mfd, 150 VAC
capacitor, between a known good earth ground (water pipe,
conduit, etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the 1500 ohms resistor and
0.15 mfd capacitor combination. Reverse the AC plug at the
AC outlet and repeat the AC voltage measurements for
each exposed metallic part. The measured voltage must
not exceed 300 mVrms. This corresponds to 200
µ
A AC.
Any value exceeding this limit constitutes a potential shock
hazard and must be corrected immediately.
4.
Fuse symbol marks.
For CANADA
For U.S.A.
UNDERWRITERS LABORATORIES Standard
CAUTION
"Risk of fire-replace fuse as marked"
Fuse rating is marked at
adjacent fuse.
Digital Video
Recorder
Summary of Contents for DSR-M804 Series
Page 3: ... 3 ...
