You will need a tech.
the drum and developer are worn out
this causes toner dusting and the toner dusting has covered the laser 'slit' glass on one end blocking the laser from drum.
you can clean the glass but problem will return unless you replace drum and developer
See if you can find its manual here if you dont have one,might help you out... https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1CHBD_en-GBGB719GB719&ion=1&espv=2&ie=UTF-8#q=Savin+4035esp+printer+manual
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