IBM 6400-I15 Maintenance Manual - Page 150
Soft vs Hard Reset, Soft Reset, Hard Reset, Hard Reset Cycle Power
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Soft vs. Hard Reset Soft Reset A soft(ware) reset clears printer memory then loads the power-up configuration into memory. (The procedure for saving configurations is described in the Setup Guide.) It is called a soft reset because no hardware is tested. All diagnostic and initialization tests are bypassed and memory is simply refreshed with the power-up printer configuration. Put the printer in the NOT READY state to do a soft reset: 1. Press the Stop key to put the printer in the NOT READY state. 2. Press the Stop + Enter keys. The LCD displays "STANDBY...", "SOFT RESET" while the printer loads the power-up configuration. Hard Reset ("Cycle Power") A hard(ware) reset is a power shutdown and restart that runs all initialization and diagnostic routines. This is also called "cycling power." 1. Set the printer power switch to O (off). 2. Wait 15 seconds. 3. Set the printer power switch to 1 (on). NOTE: A hard printer reset causes the +48V power supply (fans, motors, etc.) to shut down in 1 to 5 seconds, depending on the amount of memory installed on the controller board. 150 Troubleshooting