Lexmark T620 Service Manual - Page 158

4069-5XX/7XX Step 2 - During POST the stapler option tries to home. Note: When a 990 Service Error is displayed during POST, the failure is usually in the stapler mechanical unit or stapler card. 281 Paper Jam - The paper feeds partway into the Standard Bin even if Finisher Option selected Note: When a 900 Service Error is displayed during POST the failure is usually in the stapler gearbox assembly or stapler cartridge.. FRU 1 DC Motor in Drive Gearbox Assembly Stapler Card Assembly Action Turn the printer off, disconnect the motor from J4 and check for continuity between J4 pins 1, 2, 5, and 6 on the cable and the motor case. If you get continuity, replace the drive gearbox assembly. If you do not measure continuity, continue with this step. Check the voltages on connector J4. Note: All voltages are approximate values Pin Voltage No. Static 1 +24 V dc 2 +24 V dc 3 Not Used 4 Ground 5 +5 V dc 6 +5 V dc Voltage Feeding +24 V dc Varies +11 V dc to +24 V dc Varies +3 V dc to +5 V dc +5 V dc If the voltages are correct, replace the mechanical drive assembly. If the voltages are incorrect, replace the stapler card assembly. 2-130 Service Manual