Service manual

Rev. 1.04
- 49 -
EM 220
Mobile Printer Service Manual
7. Troubleshooting
Every undesired outcome can be investigated with fault tree analysis which is one of RCA (Root Cause
Analysis). Fault tree analysis is a graphical representation of the major faults or critical failures associated
with a product, the causes for the faults, and potential countermeasures. This way user can identify possible
causes easily.
There are six undesired outcome, divided by symptom category :
z Inadequate LED response
z Printing trouble
z MSR operation
z Diagnostic (self-test / hexa-decimal dump)
z Communication interface
7-1 Inadequate LED response
E1-1 : Poor insert battery E1-2 : Poor parts E1-3 : Discharged battery E1-4 : Regulator failure
E1-5 : MCU failure E1-6 : Poor E1-7 : Cover open sensor failure E1-8 : MCU failure