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This code is almost always a false code. I would try clearing it by entering the following key sequence: Press "Clear" then "Exposure Mode" then "Clear" then "Exposure Mode" (Note that the exposure mode key is the far left key and that these 4 keys must be pressed within 4 seconds) The display should have gone blank if these 4 keys were pressed properly. Now enter 14 as if you were making 14 copies then press the Print Button. This should clear the H4 code and the machine should operate normally. If not and the H4 comes back then you have either a thermal fuse or heater lamp failure. Good Luck
Press : CLEAR key - INTERRUPT key - O - INTERRUPT key.
The copy quantity display goes off and the machine is ready to receive input of test command number.Enter the two digit number to select the test commands.The test command number entered will be displayed in the copy quantity display.Press the PRINT switch.The operation corresponding to the entered test command number will be performed.For the test command 13 and 14 since test commands 13,14 are used to clear the contents of the diagnostic status (U1,H3,H4)stored in the LSI,the diagnostic mode will be automatically canceled after completion of the test commands.
fuser code, try typing in clear, repeat, zero, pause (Within 5 seconds) machine should go blank, type in 14, then start button. Machine should reset. If the code comes back it is a lamp or thermister and you probably cannot get those anymore. that machine is over 20 years old
The problem on your machine is on the fusing unit, the temperature in the fusing unit is low to start the machine. To cancel the trouble status follow these steps: Press CONTINOUSLY the following:
STEP1. Press CLEAR key then EXPOSURE key then CLEAR key then EXPOSURE key
STEP2. Then you are inside the simulation if the display turns OFF if not do again step 1 until the display turns off.
STEP3.press 14 then press print button
The machine will now cancel the trouble status and ready to used. If not cancelled and again H4 exist it means that there is a part inside the fusing unit that is busted like the thermostat. With this you should now contact your authorized serviceman to check your machine .
h4 code in sharp .that s fuser temperature very high .just reset it.press clear key,auto photo key,clear,auto photo key.copier goes dead .when it goes dead just press 14 then start key.copier will bi ready after some time.it works.by mian jee