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Re: H4 error on Sharp SF 7370
The heater lamp isn't coming on either because of blown heater lamp or thermostat reset itself . Clean the thermistor and replace any of the above defective part.Then press C, 0, 0, C and press 14 press READY.
Low fuser temperature.....probably the heater lamp, possibly the fuse. You'll have a hard time getting either of these...and I wouldn't recommend spending any money on it anyway. I suggest it might be time to retire the old beast. Only a few hundred dollars these days to get a little Digital copier
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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
Press P-interrupt-C-interrupt and enter test command 14 and Execute to clear your error. Let your machine reboot. If it comes back you have a problem with your fuser. Most likely it's dirt or toner caked on your tempature sensors and they need to be scraped off.