154Chapter 4 Preparing the Printer for MaintenancePreparing the Printer for MaintenanceWARNING Unplug the printer power cord from the printer or power outlet beforeyou do any maintenance procedure. Failure to remove power couldresult in injury to you or damage to equipment. If you must apply powerduring maintenance, you will be instructed to do so in the maintenanceprocedure.IMPORTANT Do not try to repair electronic components or assemblies in the field. Donot de-solder or re-solder any circuit board components. Replace amalfunctioning electronic assembly with an operational spare. Mostelectronic problems are corrected by replacing the printed circuit boardassembly, sensor, or cable that causes the fault indication. This is alsotrue of failures traced to the hammer bank—it is not field repairable andyou must replace the entire shuttle frame assembly. Hammer springassemblies are the only replaceable components of the shuttle frameassembly.To prepare the printer for maintenance, do the following steps before youmake any adjustments or perform any maintenance procedure:1. Set the printer power switch to O (off).2. Unplug the printer power cord from the printer or AC power source.3. Disconnect the data (signal) cable(s) from the printer interface.4. Unload paper.5. Read the entire adjustment or maintenance procedure before you beginworking on the printer.6. Gather the necessary tools and parts before you begin working on theprinter.
