Brother International HL-4000CN Service Manual - Page 243

Tray2 Paper Near Empty FIP Step Check Initial setting Check the following for evidence of fault. 1 Tray2 low paper sensor replacing condition Sensor actuator replacing condition 2 Does the error occur even if the paper is added? Checking tray2 low paper sensor Does tray2 low paper sensor function 3 normally? Tray2 low paper sensor using diagnostic tool, check by digital input test. 4 Checking feeder PWB for signal Is P/J82-10 PIN P/J82-9 +3.3VDC? 5 Checking feeder PWB for signal Is P/J81-18 PIN P/J81-23 +3.3VDC? Harness ASSY OPFPLG/ harness ASSY Checking OPFREC/ harness ASSY 6 OPFMAIN for continuity Check the following for continuity. J81-18PINJ810-A9PINJ210- B9PINJ21-9PIN 7 Checking feeder PWB for signal Is P/J82-8PINP/J82-9 +5VDC? Remedy Yes No Replace the parts concerned Go to step [2] Go to step [3] End of work Replace MCU and HVPS PWB Go to step [4] Go to step [7] Replace feeder PWB Go to step [5] Go to step [6] Replace MCU and HVPS PWB Replace feeder PWB Replace harness ASSY which is not continuous Replace tray2 Replace feeder low paper sensor PWB Tray3 Paper Near Empty FIP Step Check Initial setting Check the following for evidence of fault. 1 Tray3 low paper sensor replacing condition Sensor actuator replacing condition 2 Does the error occur even if the paper is added? Checking tray3 low paper sensor Does tray3 low paper sensor function 3 normally? Tray3 low paper sensor using diagnostic tool, check by digital input test. 4 Checking feeder PWB for signal Is P/J83-10 PIN P/J83-9 +3.3VDC? 5 Checking feeder PWB for signal Is P/J81-17 PIN P/J81-23 +3.3VDC? Harness ASSY OPFPLG/ harness ASSY Checking OPFREC/ harness ASSY 6 OPFMAIN for continuity Check the following for continuity. J81-17PINJ810-A10PINJ210- B10PINJ21-10PIN 7 Checking feeder PWB for signal Is P/J83-8PINP/J83-9 +5VDC? Remedy Yes No Replace the parts concerned Go to step [2] Go to step [3] End of work Replace MCU and HVPS PWB Go to step [4] Go to step [7] Replace feeder PWB Go to step [5] Go to step [6] Replace MCU and HVPS PWB Replace feeder PWB Replace harness ASSY which is not continuous Replace tray3 Replace feeder low paper sensor PWB V-38