Riso V8000 Series, Technical Manual

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CHAPTER 1. MAINTENANCE
Electrical system work
• After removing wire bundles, fasten them
with wire bundle bands (bar lock ties) so
that they will not sag.
• When installing parts, be careful to avoid
pinching or damaging the wire bundles.
• If a fuse blows, always replace it with one
with the specified capacity. Using a fuse
with a larger capacity can not only dam-
age parts, but may cause fires.
• Be careful not to drop image scanners,
thermal print heads, and other sensors
as they can be easily damaged.
Switch types
• Microswitches may be divided between nor-
mally open (NO) types and normally closed
(NC) types.
With an NO connection, an internal con-
tact is connected when the switch actua-
tor is pressed.
With an NC connection, an internal con-
tact is disconnected when the switch ac-
tuator is pressed.
• Magnetic lead switches are switches in
which an internal contact is connected
in reaction to the magnetic force of a
magnet.
Sensor types
• Photo-electric sensors may be broadly
divided into the following four types: in-
terrupt types (U-shaped), actuator types,
reflective types, and transmittive types.
• Magnetic sensors use Hall ICs, which re-
act to the magnetic force in magnets.
• Always turn off the power before plugging
or unplugging sensor connectors.