Lexmark C 746 Service Manual

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High-voltage power supply (HVPS) removal
See “High-voltage power supply” on page 7-13 for the part number.
1.Remove the left cover. See “Left cover removal” on page 4-31.
2.Remove the six mounting screws (A).
3.Release the locking tab (B) from the front, lower corner of the HVPS.
A
B 

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4.Disconnect the five connectors (C) from the HVPS.
Installation notes: 
•Make sure to replace the spring when replacing the HVPS.
•There are two types of spring forces on the cartridge contacts. Make sure to put the springs in their 
appropriate slots and are oriented properly.
C 

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High-voltage power supply (HVPS) cable removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-50.
2.Disconnect the cable connector at JHVPS1 on the system board.
3.Disconnect the cable connector (B) from the HVPS.
4.Remove the cable from the hole through the frame (C), and from the two cable restraints (D). 

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Left bell crank assembly removal
See “Left bellcrank assembly, with spring” on page 7-7 for the part number.
1.Remove the left cover. See “Left cover removal” on page 4-31.
2.Remove the C-clip (A).
3.Remove the left bell crank assembly.
A 

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Low-voltage power supply (LVPS) removal
See “Low-voltage power supply” on page 7-9 for the part number.
1.Remove the right cover. See “Right cover removal” on page 4-51.
2.Remove the rear frame cover. See “Rear frame cover removal” on page 4-47.
3.Disconnect the connector at JLVPS1 connector (A) on the system board.
4.Remove the five LVPS mounting screws (B).
5.Disconnect the AC fuser cable (C) from the LVPS.
A 

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Installation note:
•When installing the new LVPS, make sure the voltage switch (A) is set for the proper value (115 V or 
230 V), depending on the country.
Note:  Not all LVPS FRUs have a switch. Others are switched automatically.
•Install the LVPS, and make sure the AC fuser cable is in the cable guides, and not behind the LVPS.
•Reconnect the AC fuser cable to the LVPS.
•Replace the five LVPS mounting screws.
•Reconnect the cable in connector JLVPS1 on...

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Motor driver card removal
1.Remove the right cover. See “Right cover removal” on page 4-51.
2.Disconnect the three cables (A).
3.Remove the two screws (B), and remove the motor driver card. 

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Motor driver cable removal
1.Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Disconnect the connector in JDVR1 (A) on the system board.
3.Disconnect the connector on the motor driver card (B).
4.Remove the cable from the cable from the four cable retainers (C).
Installation note:  Pay attention to the routing of the cable and the cable retainers. 

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Multipurpose feeder (MPF)/duplex gear and housing removal
See the multipurpose feeder/duplex gear and housing kit for the part number.
1.Remove the paper pick mechanism assembly. See “Paper pick mechanism assembly removal” on 
page 4-137.
2.Remove the two E-clips (A) from the gears.
3.Remove the three screws (B).
4.Slide the front gear (C) off.
A
BC 

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5.Slide a flathead screwdriver up and under the front cover.
6.Slide the remaining two gears and housings off.