Lexmark Pro910 Series, Service Manual

Page: 35 / 118

Diagnostic information
2-15
Lexmark Pro910 Series
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Paper feed motor does not
operate. Check the paper feed motor connector J3 on the system board. If it is connected, then
check for approximately 30 V dc on pins 1 and 2. If the voltage is incorrect, then
replace the system board. See
“System board removal” on page 4-35 . Although the
paper feeds turns in one direction, the paper feed motor turns in two directions. If the
paper feed motor turns in one direction only, then replace the system board. See
“System board removal” on page 4-35 .
Poor print quality • Be sure that the printer contains good print cartridges.
• Be sure the print cartridge nozzle plate is clean. Clean with a lint-free cloth, wiping
along the direction of the nozzle.
Ink smudging and smearing can be caused by paper problems or problems in the
paper feed area. Check for:
• Correct type of paper
• Curled or wrinkled paper
• Paper path obstructions
• Paper pick roller wear or looseness. If the paper pick rollers are defective, then
replace them. See “Paper pick rollers removal” on page 4-16 .
• Worn gears or binds. If the gears are defective, then replace the print engine. See
“Print engine removal” on page 4-50 .
Blurred prints and voids can be caused by problems in the carrier transport area.
Check for:
• Carrier transport belt and idler pulley parts for wear, damage, or looseness. If the
carrier transport belt is worn or if the idler pulley parts are defective, then replace
the print engine. See
“Print engine removal” on page 4-50 .
• Carrier shaft for wear or dirt. If the rod is dirty, then clean and lubricate it. The
carrier to carrier frame engagement should be lubricated with grease
P/N 40X0179.
Carrier service checks
Symptom Action