Lexmark Optra S Service Manual - Page 84

4059-XXX FRU 4 Engine Board 5 LVPS Interconnect Board Action Check the +42 V dc test point on the engine board. Go to "Engine Board" on page 5-4 in the locations section to find the +42 V dc test point. Be careful not to short between the test point and any other pin. The voltage measures approximately +42 V dc. If correct, replace the engine board. Check the voltage at CN3-18 on the LVPS. It measures approximately +42 V dc. If incorrect, replace the LVPS. If correct, replace the interconnect board. Input Sensor Service Check Service Tip: Run the base sensor test. Check the input sensor for proper operation. The display changes from open to closed as the sensor flag is manually moved in and out of the sensor. Service Tip: Run a Diagnostic Print Test in the continuous mode with the controller board removed. A defective input sensor or circuit causes the first copy to exit only partially through the fuser assembly. FRU 1 Input Sensor Flag 2 Engine Board 3 Input Sensor Cable Action Check the input sensor flag for damage and proper operation. If a problem is found, repair as necessary. Check for approximately +5 V dc at J10-10 on the engine board. If incorrect, replace the engine board. Check the continuity of the input sensor cable. If incorrect, replace the cable. If correct, replace the input sensor assembly. 2-57 4059 Service Manual