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Service Guide OL830
Chapter 2 Principles of Operation
2.3.02 Engine Controller Board (LLAB-2)
The Engine Controller Board contains an 80C51 Microprocessor (8-bit), an EPROM which stores
the Engine Control Program and an EEPROM.
The Engine Controller Board turns the LED array diodes ON to place an electrostatic image on
the photosensitive drum. The Engine Controller Board also controls the paper feed, paper
transport, and electrophotographic processing actions so the electrostatic image can be printed by
fusing toner on the paper.
The 1 Kbit Electrically Erasable PROM (EEPROM) is loaded with the following data:
Total number of sheets printed after installation
Modified page count
Total number of sheets printed with the current drum
Total number of sheets printed with the current fuser
Setting of time required from the completion of printing to Quiet Mode
Feed time needed to feed the paper to a printable position
Vertical Registration (Top margin)
LED head drive time.
NOTE:
The EEPROM preserves the data while the supply voltage is off.
The counters stored in the EEPROM can be accessed by using SW1 on the Engine Controller
Board to set the printer in the Maintenance Mode.
(See Section 3 of the OL400 Service
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The count of the total number of sheets printed after installation cannot be reset.
The count of the total number of sheets printed with the drum currently in use should be taken as
a rough measure of the useful life of the drum: It is reset to zero when the drum is replaced by
holding down the RESET button and applying power to the printer.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
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