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L4 is a motor lock if you hold down the start key it should give you a sub code 01 main motor, 11, Shift motor, Make sure all jams are cleared out of machine a jam in the fuser/heater section will cause a moter lock to clear code press key #/P-asterisk(*)-clear key(C) asterisk(*) machine will ask you to enter simulation enter (14) on 10 key pad press start,machine will reset or you may need to press CA key to make it reset. If problem comes back you will need to place a service call.
On the panel display, press #, interrupt,0, interrupt keys in that
order. Display will go off then enter the desired number and press
Print. If the command has subcode, enter it and press Print to execute.
H4-00 on Sharp means that the temperature inside the printer is too low. That is usually the fuser lamp, and rarely the temp sensor. When this happen you need to have the fuser unit replaced, if that does not fix the problem the technician will replace the temperature sensor.
there might be some dirt on thermistor above the heater upper roller pls check and clean the fuser unit then use simulation 14 to reset the machine enter simulation by presssing #,interrupt,c,interrupt in sequence display is then off, then no. 14 then start key h2 disappears ok