Safety Precautions - Mitsubishi Electric CP-D70DW Service Manual

SAFETY PRECAUTIONS

NOTICE : Observe all cautions and safety notes located inside the cabinet and on the chassis.
LEAKAGE CURRENT CHECK
Before returning the printer to the customer, it is recommended that leakage current be measured according to the following
methods.
1. Cold Check
With the AC plug removed from the 120 V / 220-240 V AC source, place a jumper across the two AC plug prongs. Turn the
printer AC switch on. Using an ohm-meter, connect one lead to the AC plug and touch the other lead to each exposed metal
part (screwheads, metal overlays, etc.), particularly any exposed metal part having a return path to the chassis. Exposed metal
parts having a return path to the chassis should have a minimum resistance reading of 1 meg ohm. Any resistance below this
value indicates an abnormality which requires corrective action. Exposed metal parts not having a return path to the chassis will
indicate an open circuit.
2. Hot Check
Use the circuit in the Figure to perform this test.
(1) With switch S1 open, connect the printer to the measuring circuit. Immediately after connection, measure the leakage current
using both positions of switch S2, and with the switching devices in the printer in all of their operating positions.
(2) Switch S1 is then closed, energising the printer. Immediately after closing the switch, measure the leakage current using both
positions of switch S2, and with the switching devices in the printer in all of their operating positions.
Current measurements of items (1) and (2) are to be repeated after the printer has reached thermal stabilisation. The leakage
current shall not be more than 0.5 milliampere.
120 V
/ 220-240 V
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the printer have special safety related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement
components rated for higher voltage, etc. Replacement parts which have these special safety characteristics are identifi ed in this
service manual. Electrical components having such features are identifi ed by shading on the schematic diagram and the parts
list of this service manual, and by the supplementary sheet for this chassis to be issued subsequently. Therefore replacements
for any safety parts should be identical in value and characteristics.
CAUTION : DOUBLE POLE/
NEUTRAL FUSING
S2
S1
GROUNDING SUPPLY CONDUCTOR
PRINTER
GH
(GROUNDING)
OPEN
B
- 2 -
AC MILLIAMMETER
A
INSULATING
TABLE