Lexmark C750 Service Manual - Page 175

5060-00x Missing colors-Complete or partially missing color planes • If a color or colors are missing, or a color is partially missing, go to "Step A" on page 2-143. • If cyan, magenta, and yellow is missing, go to "Black and white only-cyan, magenta, and yellow are missing" on page 2-142. Step 1 Action and questions Print cartridge - Make sure the cartridge is seated properly and that all packing material has been removed from the cartridge. Has all packing material been removed? Is the cartridge seated correctly? 2 Inspect each of the transfer roll bellcranks. Were any of the bellcranks broken? 3 Perform the partial print test. See "Partial Print Test" on page 3-5. Is the image well developed on the PC drum but the same plane is missing or faded on the ITU belt? 4 Turn off the printer. Check the cable connections between the transfer HVPS board and the system board. Do you continue to have the same problem? 5 Check continuity on the cable between the respective rear bellcrank and the lead on the transfer HVPS board. Is there continuity? Replace in the following order: 1. "Transfer HVPS board removal" on page 4-80 2. "Cartridge contact assembly removal" on page 4-23 3. "Engine board removal" on page 4-29. Go to step 7 Replace the FRUs in the following order: 1. Cable 2. FTR spring. Go to step 5 Problem resolved Replace the broken bell cranks. Go to step 4 Go to step 3 Yes Go to step 2 No Remove packaging and seat cartridge Go to step 6 6 Change or switch failing cartridge. Do you continue to have the same problem? Replace the cartridge. Replace the "Cartridge contact assembly removal" on page 4-23. 7 Cartridge contact assembly - Check the cartridge contact block. Make sure the PC drum contact pin is not stuck. See "Cartridge contact assembly removal" on page 4-23 to identify the PC drum contact pin. Does the pin operate correctly? Go to step 8 Diagnostic information 2-141