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Service Guide - OKIPAGE 8c
Chapter 2 Operation
2.12 Power-on Processing
2.12.1 Self-diagnostic test
(1)
Initial test
The following check are automatically performed when the printer is power on:
(a) ROM check
(b) RAM check
(c) EEPROM check
(d) Flash ROM check
(2)
ROM check
(a) Checks ROM by comparing the sum of bits in the received data unit by the number of
bits in the transferred data unit.
(3)
RAM check
(a) Checks RAM by writing a preset data patter in RAM, reading the contents of RAM,
and comparing the data read from RAM by the data written in RAM. (Write-read test).
(b) Checks optional RAM (if it is installed).
(c) Checks resident RAM by exclusively O Ring high and low addresses (to prepare
16-bit data units), writing a preset 16-bit data patter in RAM, reading the contents of
RAM, and comparing the data read from RAM by the data written in RAM. Checks
optional RAM by writing and reading 32-bit fixed patterns ("5555h" and "aaaah") in
optional RAM.
(4)
EEPROM check
(a) Checks identification numbers stored in the fixed addresses of EEPROM.
(b) Checks the contents of the menu area (by control firmware) and the engine area (by
engine firmware).
(5)
Flash ROM check
Checks Flash ROM by writing a present data pattern in Flash ROM, reading the contents
of Flash ROM, and comparing the data read from Flash ROM by the data written in Flash
ROM. (Write-read test).
(6)
Option check unit
Checks whether the optional units (such as the second tray, and PS SIMM) have been
installed before entering the operation mode.
Copyright 1998, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Summary of Contents for OKIPAGE 8c
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