Xerox 1235N Service Guide - Page 59

Fuser unit error 1. Does the error occur immediately after the printer is turned on? Replace the fuser. 2. Check that AC voltage supplied to the printer is correct. 3. Does the fuser get hot? If not, replace the fuser. 4. If the fuser does warm up, verify that it is reaching the correct temperature by running the service test "Switch scan test" on page 63. 5. Does AC voltage appear between Pins 1 and 2 of CN 4-1 and CN 4-2 of the fuser connector. These pins connect to Pins A and B of the fuser (illustrated below) when the fuser is installed. Remove the fuser to check. If not, replace the power supply. B A B A C D E F C D E F Underside of fuser 0728-02 Bear in mind that the correct AC voltage may be present at Pins 1 and 2 of CN 4-1 and CN 4-2 even though the drivers feeding these pins are damaged and cannot deliver the current required by the fuser heaters. 6. Replace the engine controller board. 7. Replace the low-voltage power supply. Service Guide 45