Oki MB290 Service Manual

PRINTER 3000 304 995 - 01
i
PRINTER MODEL-L1
           （
G191
）
SERVICE MANUAL
TECHNICAL DOCUMENT
6 September 2005
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1-5
Detailed
Descriptions
Block Diagram
The Engine Board controls the laser diode power (APCSH) and transfers data for
printing to the laser diode (VIDEO). As an electrical safety feature, there is an
interlock switch on the Engine Board. This switch cuts +24 volts whenever the front
door is opened.
Error Conditions
Laser Error
The machine detects laser synchronization signal pulses (PGSYCI) 70 milliseconds
after the (LDENA) signal is sent. It detects a laser error if the pulse count does not
reach the specified number within 400 milliseconds.
When this occurs, the machine warns the customer on the LCD panel (Error 56).
Polygon Mirror Motor Error
The machine detects a polygon mirror motor error when the (PMLOK) signal does
not go low within 3.5 seconds of the (PMENA) signal. When this occurs, the
machine warns the customer on the LCD panel (Error 57).
Laser Diode Unit
Laser Diode
Driver
Laser Diode
Laser
Synchronization
Detector
Polygon Mirror
Motor Unit
Polygon Mirror
Motor Driver
Regulator
Engine Board
Power
Supply
Unit
+5V
VIDEO
LDENA
APCSH
PGSYCI
+24VD
PMENA
PMCLK
PMLOK
+24V
Interlock Switch
G182D012.WMF

Oki MB290 Specifications

General

Printer Type	All-in-One
Functions	Print, Copy, Scan, Fax
Print Technology	Laser
Print Speed (Black)	30 ppm
Print Resolution	1200 x 1200 dpi
Monthly Duty Cycle	30, 000 pages
Copy Speed	30 cpm
Copy Resolution	600 x 600 dpi
Scan Type	Flatbed
Scan Resolution	600 x 600 dpi
Fax Capability	Yes
Fax Transmission Speed	33.6 Kbps
Paper Capacity	250 sheets
Output capacity	150 sheets
Connectivity	USB, Ethernet