IBM 6400-I15 Maintenance Manual - Page 194
Preparing Printer for Maintenance, Gather the necessary parts before you begin working on the printer.
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Preparing the Printer for Maintenance 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 circuit board, sensor, or cable that causes the fault indication. The same is true of failures traced to the hammer bank coils and electronics: you must replace the entire shuttle frame assembly. It is not field repairable. (Hammer spring assemblies are the only replaceable components of the shuttle frame assembly.) 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. 1. Power off the printer. 2. Unplug the printer power cord from the AC power source. 3. Disconnect the host data cable from the printer interface. 4. Open the printer cover. 5. Unload paper. 6. Remove the ribbon. 7. Read the entire adjustment procedure before you begin working on the printer. 8. Gather the necessary parts before you begin working on the printer. 194 Replacement Procedures and Illustrated Parts List