IBM 4247-003 Maintenance Manual - Page 21

v 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. v 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 power off (O) 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. v 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 on page 23, to ensure the correct operation of the printer before returning it to the customer. Intermittent Strategy: For intermittent symptoms, see ″MAP 0210: Intermittent Failures″ on page 130. 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 ASF Automatic Sheet Feeder 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 21