IBM 6400-I15 Maintenance Manual - Page 67
Table 3 General Symptom List, Jams, Operator Panel, Power/IML Failures
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IMPORTANT Do not attempt field repairs of electronic components or assemblies. Replace a malfunctioning electronic assembly with an operational spare. Most electronic problems are corrected by replacing the printed circuit board assembly, sensor, or cable that causes the fault indication. The same is true of failures traced to the hammer bank: replace the entire shuttle frame assembly. It is not field repairable. 5. Replace the defective part or assembly. 6. Test printer operation after every corrective action. 7. Reinstall any parts you replaced earlier that did not solve the problem. 8. Stop troubleshooting and return the printer to normal operation when the reported symptoms disappear. Table 3. General Symptom List Symptom Troubleshooting Procedure Communications Failures Jams CLEAR JAM message instead of LOAD FORMS when printer is out of paper CLEAR JAM message will not clear and paper does not move CLEAR JAM message will not clear but paper moves Operator Panel Black squares on operator panel display Operator panel blank Operator panel display shows garbled, broken characters Operator panel keys do not work Power / IML Failures No power, and the operator panel is blank, and the card cage fan is not running Page 133 Page 115 Page 116 Page 116 Page 114 Page 120 Page 120 Page 121 Page 119 Troubleshooting 67