Service Guide 53
Front panel cycling between READY and WARMING UP
1. Make sure that the fuser, imaging unit, and toner cartridges are well seated.
2. Invoke a test print from the Front Panel to try to get an error message to be
displayed that may be present but, is masked by the front panel cycling between
READY and WARMING UP.
3. Make sure all connectors to the circuit boards are well seated and make sure
that the screws holding the boards’s in place are tight.
Erratic printer behavior
1. Phaser 740 only: Check the amount of RAM installed in the printer. While more
than 192 Mbytes of RAM can be physically installed on the image processor
board, it can electrically support no more than 192 Mbytes. Unreliable printer
operation can otherwise result.
2. Perform an NVRAM reset.
Installed RAM not recognized
1. Upon power-up, the image processor checks each DIMM for information such
as data width, clock delay, number of address columns and row, refresh rate and
more. If the DIMM does not meets the required specifications it will be ignored;
no error message will be reported.
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