Operation At Power-On; Self-Diagnostic Test - Oki C7400n Service Manual

2.12 Operation at Power-on

2.12.1 Self-diagnostic test

(1) Initial test
The followings are automatically performed at power-on.
(a) ROM check
(b) RAM check
(c) EEPROM check
(d) Flash ROM check
(2) ROM check
ROM is checked by calculating a HASH value.
(3) RAM check
(a) RAMs are by type. Out-of-specification RAM is judged as an error.
(b) The order of mounted RAMs is checked. Out-of-standard order is judged as an error.
(c) Each slot's RAM is checked by read-after-write operation.
(4) EEPROM check
Specific data stored at a fixed address of EEPROM is checked..
(5) Flash ROM check
The flash ROM format is checked. Unformatted ROM is formatted after read-after-write
checking.
(6) Option unit check
Before the printer goes into the operation mode, the presence of the option units (e.g., the
HDD, NIC, option trays and duplex unit) is checked.
41316401TH Rev.4
38 /