IBM 4247-V03, Maintenance Information

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Follow the sequence! Always do one question at a time. When a procedure precedes the question, do all of
the steps in the procedure before answering the question. Some steps have additional information that pertains
to that step. This information is in the map flow and is an aid in describing why questions or actions are needed
to find the correct failing FRU.
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Follow instructions! Instructions must be followed exactly in the order given. Questions rely on the instructions
immediately before the questions. Do not change the conditions prepared by the instructions before answering
the question. Do not turn off the printer or disconnect any cable unless you are instructed to do so. Whenever
possible, the MAPs are written so that No is the error path answer.
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Verify repair or exchange FRU! When a card or a cable is identified as the failing FRU, reseat it and verify
that the same problem remains. If the problem continues, exchange the FRU. Start again at MAP 0100: START
OF CALL (see MAP 0100: START of call), to ensure the correct operation of the printer before returning it to
the customer.
Intermittent strategy: For intermittent symptoms, see “MAP 0210: Intermittent Failures” (see MAP 0210:
Intermittent failures).
Voltage/continuity readings: When taking voltage or continuity readings, do exactly as the MAP instructs.
Abbreviations used in this book
AFTA automatic forms thickness adjustment
CPI characters per inch
CPU central processing unit
EMI electromagnetic interference
EPA environmental protection agency
MAP maintenance analysis procedure
NLQ near letter quality
Chapter 1. Diagnosing problems
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