Lexmark E 450 Dn Service Manual
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Repair information4-43 4512-630 Tray 2 auto comp tire removal Gently pull the rubber tire loose from the wheel, and replace it with a new tire. Note: Look at the nap of the tire, and orient the tire for highest friction when picking the paper.
4-44Lexmark™ E450dn 4512-630 Upper front frame group removal 1. Open the front cover. 2.Unhook the front end of the springs (A) on the right and left sides of the upper frame. 3.Insert the flat end of the spring hook through the front corner opening (B). 4.Push out on the latch by moving the top of the spring hook to the right and while lifting the corner. 5.Repeat for the right side, and remove the assembly. 6.Unlatch the left and right sides of the front cover guide (C) with a flat blade screwdriver or spring hook (D). 7.Lift the right side to align the flat on the guide shaft with the opening. 8.Slide the shaft through the opening. 9.Slide the cover to the right to free the left side, and remove the front cover guide. AB DC
Repair information4-45 4512-630 Installation note: Move the printer so the front hangs over the front edge of the work surface. Anchor the left spring on its rear post and maintain tension on it while snapping the assembly into position on the left side. Use the spring hook from below the printer to anchor the front of the spring. Carefully position the unsnapped right side so the right spring can be anchored at the rear. While maintaining tension on the spring, snap the right side into position. Use the spring hook from below the printer to anchor the front of the spring.
4-46Lexmark™ E450dn 4512-630 Wear strip removal (tray 1) 1. Hold the tray with the bottom up. 2.Use a spring hook to unfasten each of the anchors on the back of each strip. 3.Remove the strip from inside the tray. Wear strip removal (tray 2) 1. Pull up the strip with the spring hook to free it at the top. 2.Lift the strip out.
Repair information4-47 4512-630 Note: When replacing the strip: •Push the strip up with your thumb to make sure that the strip is in place. •Turn the tray over so that you are looking at the bottom of the strip. Using the spring hook, check to make sure that the end of the strip is secure and the strip is fastened tightly.
Locations and connections5-1 4512-630 5. Locations and connections Locations Front view Rear view 150-Sheet output bin 250-Sheet tray 550-Sheet drawer (optional) Paper support Control panel Front door Manual feeder
5-2Service Manual 4512-630 Controller card connector pin values Note: See the wiring diagram at back of book. These values were measured with all connections made (plugged) or with only one connector at a time unplugged to expose the pins. Always disconnect and connect with the printer power off. Otherwise, the values below may not match. Connector Pin # Value cablepluggedVa l ue cable unplugged (if different)Comments J1 1 Signal Smart chip 2Ground J2 1 Less than 5 V dc Toner level sensor 2Ground 3 Signal J3 1, 3, 5 Signal Operator panel 25Vdc 4, 7 Ground 63.3Vdc J4 1 Ground Cooling fan 224Vdc J5 1, 3 Signal LSU drive 2Ground J6 1, 2 5 V dc Less than 1 V dcFront cover open switch Cover closed Cover open 3Ground 10Vdc 25v 3Ground J8 2, 4, 7 Ground LSU 10 5 V dc 1, 3, 5, 6, 8, 9 Signal J9 1, 2 24 V dc Reversing solenoid 2 Less than 1 V dc J10 1 Less than 5 V dc Narrow media sensor 25Vdc 3Ground J11 1 Less than 5 V dc Exit sensor 25Vdc 3Ground J13 1 5 V dc Thermistor 2Ground
Locations and connections5-3 4512-630 J15 1 5 V dc LSU (HSYNC) 2, 3 Signal 4Ground J17 1-4 Signal 3.2 V dc Main motor 5Ground 65Vdc 7-9 24 V dc Less than 24 V dc J19 1-6 Signal LVPS/HVPS 7Ground 8, 9 24 V dc 10, 11, 15 Signal 12, 14 Ground 13 5 V dc J20 1 Less than 5 V dc 5 V dc Manual feed sensor 25Vdc5Vdc 3Ground J21 1-4 24 V dc Manual feed solenoids 1, 3 24 V dc 2, 4 0 V dc J22 1, 4, 5 Signal Tray 2 2, 3 24 V dc 6Ground J25 1 Less than 5 V dc 5 V dc Paper feed and duplex sensors 25Vdc5Vdc 4 Less than V dc 5 V dc 55Vdc5Vdc 3, 6 Ground Connector Pin # Value cablepluggedVa l ue cable unplugged (if different)Comments
5-4Service Manual 4512-630 Connectors System board Connector Pin no. Signal J1 USB Port G1 Ground 1 USB +5 V dc 2 USB D- 3 USB D+ 4 Ground G2 Ground