IBM 6400-I15 Maintenance Manual - Page 66
Troubleshooting Other Systems, General Symptom List
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Troubleshooting Other Symptoms DANGER: Hazardous voltages are present in the printer with the power cord connected to the power source. Switch off printer power and unplug the printer power cord before proceeding. Do not connect or disconnect any communication port, teleport, attachment connector, or power cord during an electrical storm. Power off the printer and disconnect the power cord before connecting or disconnecting communication port, teleport, or attachment cable connector. Use standard fault isolation techniques to troubleshoot malfunctions that are not indicated by display messages. These techniques are summarized below: 1. Ask the operator to describe the problem. 2. Verify the fault by running a diagnostic printer test or by replicating conditions reported by the user. 3. Look for a match in the General Symptom List that begins on page 67. If you find a match, go to the troubleshooting procedure and follow the numbered instructions. 4. If you do not find the symptom in the General Symptom List, use the Half-Split Method to find the malfunction: a. Start at a general level and work down to details. b. Isolate faults to half the remaining system at a time, until the final half is a field-replaceable part or assembly. (Troubleshooting aids are listed on page 55.) 66 Troubleshooting
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