Lexmark C540 Service Manual - Page 59

5025-2xx, 4xx 925.01-Fan error service check Step Questions / actions 1 Turn the printer off, and remove the rear shield. See "Rear shield removal" on page 4-11. Check the fan cable at JFAN1 for the following values: JFAN1 Pin Value 1 +3.3 V dc 2 Ground 3 0 (fan off) Are the measured values correct? Yes No Replace the top cover (which includes the fan). See "Top cover assembly removal" on page 4-12. Replace the controller board. See "Controller board removal" on page 4-19. 930.xx-935.xx-Printhead errors service check Step Questions / actions 1 Turn the printer off, and remove the rear shield. See "Rear shield removal" on page 4-11. Check the cables connected at JMIRR1 and JPH1 on the controller board. Check for damage. Are the cables damaged? 2 Turn the printer on, and verify the following values at JMIRR1: JMIRR1 Pin Value 2 +3.3 V dc 4 Ground 5 +24 V dc Are the values approximately correct? Yes Replace the printhead. See "Printhead removal" on page 4-49. No Go to step 2. Replace the printhead. See "Printhead removal" on page 4-49. Replace the controller board. See "Controller board removal" on page 4-19. Diagnostic information 2-25