Lexmark C750 Service Manual - Page 125

5060-00x Step 4 Actions and questions Disconnect the VTB fan from J4 on the engine board and check the voltages on J4. Pin Fan on Fan off Fan Fan disconnected disconnected Fan switch on Fan switch off +3.3 V dc 0V 0V +24 V dc +3.3 V dc 0V +2 V dc +24 V dc Yes Replace the VTB fan. See "Vacuum transport belt (VTB) fan removal" on page 4-84 No Replace the engine board. See "Engine board removal" on page 4-29. J4-1 J4-2 J4-3 J4-4 +1.6V dc 0V +3.1 V dc +24 V dc +3.3 V dc 0V 0 V dc +24 V dc Are the voltages correct? 927 Error code RIP fan Step 1 Actions and questions Turn the power off and manually spin the fan and check that it rotates freely. Does the fan rotate freely? 2 Check the RIP fan cable connection to the engine board, J53 for correct installation. Is the cable installed correctly? 3 Check for any obstruction in the fan. Is there an obstruction in the fan? 4 Disconnect the RIP fan from J53 on the engine board and check the voltages on J53. Pin Fan on Fan off Fan Fan disconnected disconnected Fan switch on Fan switch off +3.3 V dc 0V 0V +24 V dc +3.3 V dc 0V +2 V dc +24 V dc Yes Go to step 2 No Replace the RIP fan. See "RIP fan removal" on page 4-71. Install the cable correctly. Go to step 3 Remove the obstruction. Replace the RIP fan. See "RIP fan removal" on page 4-71. Go to step 4 Replace the engine board. See "Engine board removal" on page 4-29. J53-1 +1.6 V dc J53-2 0 V J53-3 +1.9 V dc J53-4 +24 V dc +3.3 V dc 0V 0 V dc +24 V dc Are the voltages correct? Diagnostic information 2-91