Lexmark C540 Service Manual - Page 60
xx, 937.xx-Transport motor service check, 950.xx NVRAM Failure service check
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5025-2xx, 4xx 936.xx, 937.xx-Transport motor 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 cable at JCARB1 for proper connection to the controller board. Is the cable properly connected? 2 Turn the printer on, and ten measure the values of the cable at JCARB1: JCARB1 Pin Value 4 +24 V dc 6 +24 V dc 8 +24 V dc 9 Ground 12 Ground 13 +24 V dc 15 +24 V dc 17 +24 V dc Are the values approximately correct? Yes Reconnect the cable. No Go to step 2. Replace the main drive gear assembly. See "Main drive gear assembly removal" on page 4-45. Replace the controller board. See "Controller board removal" on page 4-19. 950.xx NVRAM Failure service check Warning: Replace one of the following components, and perform a POR before replacing a second component. Never replace both of the components without performing a POR after installing each one, or the printer will be rendered inoperable: • Operator panel assembly • Controller board Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, and the printer is powered on, it cannot be used in another printer. It must be returned to the manufacturer. This error code indicates a mismatch between the memory on the operator panel assembly and the one on the controller board. Step Questions / actions Yes No 1 Have any updates been made to the firmware? Reload the firmware and try again. Go to step 2. 2 Did reloading the firmware correct the problem? Problem resolved. Replace the controller board with a new, and not previously installed controller board. See "Controller board removal" on page 4-19. Replace the controller board with a new, and not previously installed controller board. See "Controller board removal" on page 4-19. 2-26 Service Manual