Preparing The Printer For Maintenance - IBM 6400 series Maintenance Manual

Preparing the Printer for Maintenance

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:
<3> . . 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.
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IMPORTANT
Replacement Procedures and Illustrated Parts List