Gestetner G056 Service Manual page 230

SC Level
820 B Self-diagnostic error - CPU
CPU error detected during
self-diagnostic.
821 B Self-diagnostic error - ASIC/CPU
ASIC and CPU timer error
detected during self-
diagnostic.
822 B Self-diagnostic error - HDD
HDD timeout error detected
during self-diagnostic.
823 B Self-diagnostic error - NIB
NIB error detected during
self-diagnostic.
824 B Self-diagnostic error - NVRAM
NVRAM error detected
during self-diagnostic.
827 B Self-diagnostic error - standard SDRAM
Standard SDRAM
(memory) error detected
during self-diagnostic.
828 B Self-diagnostic error - Flash ROM
Flash ROM error detected
during self-diagnostic.
829 B Self-diagnostic error - Optional RAM
Memory RAM error
detected during self-
diagnostic.
835 B Self-diagnostic error - Parallel interface
Parallel interface error
detected during self-
diagnostic.
836 B Self-diagnostic error - Font ROM
Not used for this model.
837 B Self-diagnostic error - Optional font ROM
Not used for this model.
SM
Symptom
• Defective controller
Replace the controller if the error is frequent.
• Defective controller
1. Replace the controller if the error is
• Poor HDD connection
• Defective HDD
1. Check the HDD connection.
2. Replace the HDD.
G073 model: Defective controller
Replace the controller.
G074 model:
• Poor NIB connection
• Defective NIB or controller
1. Check the connection between the NIB
2. Replace the NIB.
• Poor NVRAM connection
1. Check if the NVRAM is properly installed.
2. Replace the NVRAM
• Defective controller
Replace the controller if the error is frequent.
• Defective controller
Replace the controller if the error is frequent.
• Poor connection of the optional memory
• Defective memory RAM
1. Check the connection of the optional
2. Replace the memory DIMM.
• Defective controller
Replace the controller.
4-3
SERVICE CALL CONDITIONS
Possible Cause/Required Action
frequent.
and the controller.
memory.
G073/G074