Why print all black - Shenzhen drum manufacturers
the following the most typical and common print quality problems, for example, analyze the fault phenomenon, find out the possible failure of components, as well as the methods to eliminate.
a. Print all black
failure source elimination method
wire electrode charging or charging roller
clean or replace the
between the drum and the printer contact
high pressure plate
the main pull
print all black has two possible: one kind is drum drum core don't charge it with electricity; The other is a laser scanning head is out of control, to drum full scan.
if the charging roller the recharge drum core on electricity, drum core is integral with the opposite charge and carbon powder, and in contact with the enhancement of roll, it will complete the adsorption toner, cause all black. Try it in the first place in a drying drum, if the problem solved, proved selenium drum, can replace or repair ( Can be replaced or charging roller drum core:) 。 If confirm the drum unit is good, may be charging on the printer contact with selenium drum poor contact, can clean the contacts. On the use of wire electrode charging drum unit, if the wire electrode. Insulation with anxious burnt phenomenon, can use a multimeter electric block between measuring wire electrode and reseau, to see if the short circuit, if the resistance is small or short circuit, clean or replace the wire electrode. Clean printer and internal contact contact, and changed in drums, if still cannot solve the problem is to replace high pressure plate.
check if the above are in good condition, then the fault may be occur within the scanning component of high frequency laser drive circuit or logic circuit, a laser 丨 scanning components should be replaced or motherboard.