Ricoh B082 Service Manual page 216

SERVICE CALL CONDITIONS
Code No.
818 B Watch Dog Error
While the system program is running, a bus
hold or interrupt program goes into an
eternal loop, preventing any other
programs from executing.
819 B Kernel mismatch error
Software bug
820 B Self-Diagnostic Error: CPU
The central processing unit returned an
error during the self-diagnostic test.
821 B Self-Diagnostic Error: ASIC
The ASIC returned an error during the self-
diagnostic test because the ASIC and CPU
timer interrupts were compared and
determined to be out of range.
822 B Self-Diagnostic Error: HDD
The hard disk drive returned an error
during the self-diagnostic test.
823 B Self-diagnostic Error: NIB
The network interface board returned an
error during the self-diagnostic test.
824 B Self-diagnostic Error: NVRAM
The resident non-volatile RAM returned an
error during the self-diagnostic test.
826 B Self-diagnostic Error: NVRAM/Optional
NVRAM
The NVRAM or optional NVRAM returned
an error during the self-diagnostic test.
827 B Self-diagnostic Error: RAM
The resident RAM returned a verify error
during the self-diagnostic test.
828 B Self-diagnostic Error: ROM
The resident read-only memory returned an
error during the self-diagnostic test.
829 B Self-diagnostic Error: Optional RAM
The optional RAM returned an error during
the self-diagnostic test.
835 B Self-Diagnostic Error: Parallel Interface
Loopback test error.
836 B Self-diagnostic Error: Resident Font ROM
The resident font ROM returned an error
during the self-diagnostic test.
B079/B082
Symptom
4-18
Possible Cause
System program defective
Controller board defective
Peripheral device malfunction
Software application error
Controller board defective
Software defective
Controller board defective
HDD defective
HDD connector defective
Controller board defective
Network interface board defective
Controller board defective
NVRAM damaged or abnormal
Backup battery has discharged
NVRAM socket damaged
NVRAM defective
Memory malfunction
Controller board defective
Firmware defective
RAM DIMM defective
Controller board defective
Loopback connector not detected
IEEE1284 connector defective
Controller board defective
Font ROM defective
Rev. 09/2003
SM