Lexmark C750 Service Manual - Page 151

5060-00x Step 3 Action and questions Check continuity of the paper level sensing cable. Note: This cable is used for both the paper level sensing assembly and the transparency sensor assembly. Is there continuity? Yes Replace the autocompensator assembly. If this does not correct the problem, replace the engine board. See "Engine board removal" on page 4-29. No Replace the cable Black only retract (BOR) service check Step 1 Action and questions Manual check of BOR system- Remove the print cartridges. Observe the ITU belt as you manually rotate the BOR gear. Yes Go to "Entire page is mostly one color-Full bleed planes in one color" on page 2-140. No Go to step 2 Does the ITU belt move up and down when the ITU is toggled? 2 Remove the ITU. Manually activate the BOR gear. Verify that the front and back BOR cams are moving the respective bell cranks. Do the cams move back and forth properly? Replace in the following order: 1. BOR drive assembly. See "BOR drive assembly removal" on page 4-23. 2. Engine board. See "Engine board removal" on page 4-29. Determine which component is preventing the proper movement. Diagnostic information 2-117