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
Summary of Contents for 4247
Page 1: ...4247 Printers Maintenance Information Document Number SA24 4400 05 Part Number 27P8450 IBM ...
Page 241: ...e90apc15 Figure 24 Main Input Power Supply Ground Chapter 3 Circuit Diagrams 241 ...
Page 257: ...Figure 32 Stacker Motor Wiring Chapter 3 Circuit Diagrams 257 ...
Page 261: ...Stacker Cable Wiring Figure 36 Tractor Assembly Cable Wiring Chapter 3 Circuit Diagrams 261 ...