Ricoh DD 4450 Service Manual page 23

Boards
No. Component
6 CCD and SBU
Paper Width Detection Board
18
30 Ink Detection Board
36 Operation Panel Boards
37 Power Supply Unit (PSU)
54 Main Motor Board
Main Processing Unit (MPU)
62
70 Lamp Stabilizer
Motors
No. Component
5 Scanner Motor
23 Master Feed Motor
24 Table Motor
SM
Function
Outputs a video signal to the MPU.
Sends data about the paper width on the paper
table to the MPU.
Checks if there is ink in the drum.
These boards control the operation panel.
Provides dc power to the machine.
Controls the main motor speed.
Controls all machine functions, both directly and
through other boards.
This supplies power to the exposure lamp.
Function
Drives the scanner.
Feeds the master to the drum.
Raises and lowers the paper table.
1-5
Overview
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