Symptom  | Possible cause  | Necessary actions  | 
|---|---|---|
The same or similar image appears two or more times. They get weaker and weaker.  | Defective PCDU  | Replace the PCDU.  | 
Defective transfer unit  | Replace the transfer unit.  | 
Symptom  | Possible cause  | Necessary actions  | 
|---|---|---|
The same or similar image appears two or more times. They get weaker and weaker.  | Defective PCDU  | Replace the PCDU.  | 
Defective transfer unit  | Replace the transfer unit.  |