Service manual

SECTION II: ELECTRICAL HAZARDS (CONT’D)
B. Servicing with “Power Off”
For maximum safety, unplug the service cord from the wall outlet before opening
the vendor door. This will remove power from the equipment and avoid electrical
and mechanical hazards. Service personnel should remain aware of possible
hazards from hot components even though electrical power is off. See the
appropriate sections of this manual for further information.
C. Servicing with “Power On”
Some service situations may require access with power on. Power-on servicing
should be performed only by fully qualified service technicians. Particular caution
is required in servicing assemblies that combine electrical power and mechanical
movement. Sudden movement (to escape mechanical action) can result in contact
with live circuits and vice versa. It is therefore doubly important to maintain
maximum clearances from both moving parts and live circuits when servicing.
WARNING:
“POWER-ON” SERVICING SHOULD BE ACCOMPLISHED ONLY BY
FULLY TRAINED PERSONNEL. SUCH SERVICE BY UNQUALIFIED
INDIVIDUALS CAN BE DANGEROUS.
NOTE: For Power-On servicing of vendors with a door power switch, it is necessary to
activate the switch when the outer door is open. This is accomplished by one of
the following methods:
1. Straight Plunger Switch: Pull plunger forward.
2. Protected Plunger Switch: Place key (provided) in position to hold
plunger inward.
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