Ld Safety Switch; Error Messages; Laser Optics Housing Unit - Ricoh D143 Field Service Manual

LD Safety Switch

A relay on the PSU ensures technician and user safety. It also prevents the laser beam from turning on
during servicing. This relay turns off when the front cover, upper left cover, or right door is opened. At
this time it cuts the power (+5V) supplied to the LD board for each color through the IPU.
Two safety switches are turned on or off by the front door or right door, and this opens the relay.
• LD Driver: Precise Pulse Modulation ASIC on C-MOS technology
• LDB: LD Drive Board (included in the LD Unit)

Error Messages

Along with other switches, the LD safety switches help show error messages related to external covers.
When one or more covers are open, the messages, "Cover is open." and "Close the indicated cover,"
show with a diagram. The diagram shows which cover is open.

Laser Optics Housing Unit

• Before installing a new laser optics housing unit, remove the sponge padding and the tag from the
new unit.
Laser Optics
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