Specifications

4–19Troubleshooting
Troubleshooting Symptoms Not Indicated by Fault Messages
Use standard fault–isolation techniques to troubleshoot malfunctions not
indicated by fault messages:
1. Ask the user to describe the problem.
2. Verify the fault by running diagnostic self–tests or replicating conditions
reported by the user.
3. Locate the malfunction using the half–split method:
a. Isolate faults to half the remaining system at a time, until the final
half is a field–replaceable part or assembly.
b. Start at a general level and work down to details.
4. Replace the defective part or assembly.
IMPORTANT
Do not attempt field repairs on electronic components or assemblies —
replace the entire assembly. Most electronic problems are corrected by
replacing the printed circuit board, sensor, or cable that causes the fault
indication.
5. Test the printer after every corrective action. Stop troubleshooting and
return the printer to normal operation when the reported symptom
disappears.
Troubleshooting Aids
♦ Printer Confidence Check (page 4–20). This procedure checks basic
printer functions. Use it to establish basic printer status or to troubleshoot
imprecise or intermittent symptoms.
♦ CCB Diagnostic Check (page 4–21). This procedure checks processor
operations on the CCB and mechanism driver boards. (For CCB printers
only.)
♦ Diagnostic Self–Tests (Page 4–27.)
♦ Hex Code Printout (Page 4–30.)
♦ Appendix A: Wire Data