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LIFEPAK 20/20e Defibrillator/Monitor
Troubleshooting
Service Code Table
(continued)
(Continued on next page)
Code
Service Code Description
Corrective Action
503a
Bus error reported by USB UI channel
1. Clear error and perform PIP
2. Replace the A05 UI PCB
3. Replace the A01 System PCB
503b
Bus error reported by USB therapy channel
1. Clear error and perform PIP
2. Replace the A04 Therapy PCB
3. Replace the A01 System PCB
503c
USB host driver cannot create transfer descriptor
1. Clear error and perform PIP
2. Replace the A01 System PCB
503d
USB host driver received message larger than
maximum allowed
1. Clear error and perform PIP
2. Replace the A01 System PCB
5040
Inconsistent RTC time
Replace the A01 System PCB
6-26