IBM 4247 Maintenance Information page 22

NVRAM Non-Volatile Random Access Memory
OVFL Overflow
SW ERR Software Error
T & D Test and Diagnostic
™ ™
IPDS Intelligent Printer Data Stream
SCS SNA (Systems Network Architecture) Character String
FRU Field Replaceable Unit
OTB One Time Burn modules
ESD Electrostatic Discharge
NPS Network Printer Server
ACGA Attachment Card Guide Assembly
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Chapter 1. Diagnosing Problems