Xerox 1235N Service Guide - Page 43
Black Drum Error U29 Power Off/On
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UPC - 042215474580
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Printer fault messages Code Front panel message Service message U22 Yellow Toner Missing Reseat Toner U22-Yellow Toner Missing U23 Magenta Toner Missing Reseat Toner U23-Magenta Toner Missing U24 Cyan Toner Missing Reseat Toner U24-Cyan Toner Missing U25 Black Toner Missing Reseat Toner U25-Black Toner Missing 1. Inspect the toner cartridge sensor flag. Ensure to moves properly and is not broken. 2. Test the sensor using the test described in "Switch scan test" on page 63. 3. Inspect he toner sensor boards wiring harness. 4. Replace the toner sensor board. 5. Replace the engine control board. U26 Yellow Drum Error U26 Power Off/On U26-Yellow Drum Error U27 Magenta Drum Error U27 Power Off/On U27-Magenta Drum Error U28 Cyan Drum Error U28 Power Off/On U28-Cyan Drum Error U29 Black Drum Error U29 Power Off/On U29-Black Drum Error 1. Remove and install the drum unit. 2. Inspect the spring-loaded drum unit contacts (in a set of three). Ensure they are clean and move up and down freely. Remove the assembly and reseat it, if necessary. 3. Install a new drum unit. 4. Replace the engine controller board. 5. Replace the print unit chassis. Service Guide 29
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