Controller Self-Diagnostics; Overview - Ricoh G108 Service Manual

5.4 CONTROLLER SELF-DIAGNOSTICS

5.4.1 OVERVIEW

There are three types of self-diagnostics for the controller:
• Power-on self-diagnostics: The machine automatically starts this self-diagnostics
when you turn on the main power switch.
• Detailed self-diagnostics: The machine does this self-diagnostics with the loop-
back connector (P/N G0219350)
• SC detection: The machine automatically does this self-diagnostics to detect SC
conditions at power-on or during operation.
This flowchart illustrates the process flow of the power-on and detailed self-
diagnostics:
Power ON
Diagnostic RAM Check
CPU Check
ASIC Check
Standard RAM
Conection Check
Optional RAM
Connection Check
Clock Generator Check
Standard NVRAM
Check
Optional NVRAM Check
Font Header Check
Real Time Clock Check
Network Check
Engine I/F Check
Interrupt Check
Memory Chip Check
A
SM
Not initialized
NG
SC820
NG
ROM Sum Check
SC821
NG
Standard RAM Detailed
SC827
NG
Optional RAM Detailed
SC829
NG
Standard NVRAM
SC838
NG
Optinoal HDD Check
SC824
NG
IEEE1284 Loop-back
NG
Error Logged
SC826
NG
Font ROM Sum Check
NG
Error Logged
NG
Error Logged
NG
Error Logged
NG
Error Logged
5-47
CONTROLLER SELF-DIAGNOSTICS
A
Power-on or
Detailed
Detailed
SC828
NG
SC829
NG
Check
NG
Check
Not use optional RAM
Error Logged
NG
Detailed Check
Error Logged
Optional NVRAM
NG
Detailed Check
Error Logged
NG
Error Logged
NG
Check
Error Logged
Real Time Clock
SC826
NG
Detailed Check
NG
Error Logged
END
Power-on
G108S907.WMF
G108