Lexmark T620 Service Manual - Page 164

4069-5XX/7XX FRU 3 Stapler Board Action Check to make sure the cable to J4 (Accessory) is properly connected to J4 on the board. Turn the printer off, disconnect the motor cable from J4 and check for continuity between J4 pins 1,2,3, and 4 to the motor case. If you get continuity, replace the gearbox drive assembly. If you do not get continuity, continue with the step. Pin Voltage No. Static (Motor not Running) 1 +24 V dc 2 +24 V dc 3 Not Used 4 Ground 5 +5 V dc 6 +5 V dc Voltage Feeding (Motor Running) +24 V dc Should vary when motor running. Should vary when motor running +5 V dc If the voltages are correct, replace the gearbox drive assembly. If the voltages are incorrect, replace the stapler board. 2-136 Service Manual