20 June 2005
SELF-DIAGNOSTIC MODE
5-135
Service
Tables
5.5 SELF-DIAGNOSTIC MODE
5.5.1 SELF-DIAGNOSTIC MODE AT POWER ON
As soon as the main machine is powered on, the controller waits for the initial
settings of the copy engine to take effect and then starts an independent self-
diagnostic test program. The self-diagnostic test follows the path of the flow chart
shown below and checks the CPU, memory, HDD, and so on. An SC code is
displayed in the touch panel if the self-diagnostic program detects any malfunction
or abnormal condition.
Self-Diagnostic Test Flow
Power On
ASIC Check
Initialization
Memory Check for
Self-Diagnostic Test
SSCG Check
HDD Check
Memory Check
OPC Check
IEEE1284
I/F Check
CPU Check
Program ROM,
DIMM CRC Check
NVRAM Check
Illegal Interrupt
Check
Font ROM Check
RTC Check
IC Card
I/FCheck
Network Check
Engine I/F Check
System OS,
Application Check
Self‑Diagnostic
Mode Selection
B004S516.WMF