Lexmark 4049LMO Service Manual - Page 57

Printhead, Diagnostic Information 2-30, Dead unit, and 935 errors

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4049-XXX The elevator mechanism and switches can be inspected by removing the cover, positioning it near the feeder, reconnecting the power supply and door switch cables, and reconnecting the line cord. Check the tray height and door switches, and all cable connections. If the tray does not move at all check the elevator motor and the upper and lower limit switches. Inspect the gears, belts, and shafts for mechanical damage or blockage. The motor winding resistance is 36 ohms ±2 ohms for the following pins: 1-4, 1-6, 2-3, and 2-5. No pin should have continuity to the motor case and no pin should have a short to any other pin. If the elevator raises normally but immediately reverses when the upper limit switch is made, the paper out switch is not working. If the elevator behaves normally but the printer does not become Ready, the signal from the feeder ready switch is not reaching the printer. Dead unit: Check the printer Paper Source menu for a "Tray 2" indication to be sure the printer detects the high capacity feeder. Check feeder power supply input and output voltages. If the output is correct (pin 1: +24 VDC, pin 2: GND, pin 3: +5 VDC, pin 4: GND) replace the circuit board. When replacing the circuit board, check the A4/U.S. jumper to verify that the correct paper size is selected. Be sure to plug each cable into the correct board connector. Plugging a cable into the wrong board connector can damage the new board or other components. Printhead Note: The printhead is a sealed unit. It contains no internal parts that can be replaced or adjusted. Verify the presence of the following voltages: +24 VDC at engine board J2-1, +5 VDC at engine board J11-4, and +5 VDC at engine board J12-8. If these voltages are not correct, replace the engine board. Verify the continuity of the fan/mirror motor cable, the hsync cable, and the laser cable. 934 and 935 errors: Check engine board J2-5 during a POR; the voltage should be between +2 VDC and +4 VDC for about seven seconds after the main motor turns on. If the voltage is incorrect, replace the engine board. If the voltage is correct, check the continu- Diagnostic Information 2-30

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Diagnostic Information 2-30
4049-XXX
The elevator mechanism and switches can be inspected by remov-
ing the cover, positioning it near the feeder, reconnecting the power
supply and door switch cables, and reconnecting the line cord.
Check the tray height and door switches, and all cable connections.
If the tray does not move at all check the elevator motor and the
upper and lower limit switches. Inspect the gears, belts, and shafts
for mechanical damage or blockage. The motor winding resistance
is 36 ohms ±2 ohms for the following pins: 1-4, 1-6, 2-3, and 2-5. No
pin should have continuity to the motor case and no pin should have
a short to any other pin.
If the elevator raises normally but immediately reverses when the
upper limit switch is made, the paper out switch is not working. If the
elevator behaves normally but the printer does not become Ready,
the signal from the feeder ready switch is not reaching the printer.
Dead unit:
Check the printer Paper Source menu for a “Tray 2” indi-
cation to be sure the printer detects the high capacity feeder. Check
feeder power supply input and output voltages. If the output is cor-
rect (pin 1: +24 VDC, pin 2: GND, pin 3: +5 VDC, pin 4: GND)
replace the circuit board. When replacing the circuit board, check
the A4/U.S. jumper to verify that the correct paper size is selected.
Be sure to plug each cable into the correct board connector. Plug-
ging a cable into the wrong board connector can damage the new
board or other components.
Printhead
Note:
The printhead is a sealed unit. It contains no internal parts
that can be replaced or adjusted.
Verify the presence of the following voltages: +24 VDC at engine
board J2-1, +5 VDC at engine board J11-4, and +5 VDC at engine
board J12-8. If these voltages are not correct, replace the engine
board.
Verify the continuity of the fan/mirror motor cable, the hsync cable,
and the laser cable.
934 and 935 errors
: Check engine board J2-5 during a POR; the
voltage should be between +2 VDC and +4 VDC for about seven
seconds after the main motor turns on. If the voltage is incorrect,
replace the engine board. If the voltage is correct, check the continu-