Causes: Center staple paddle lift motor/C (M26) Paddle home sensor/C (PS37) SD drive board (SDDB) FS control board (FSCB).The paddle home sensor/C (PS37) is turned neither ON nor OFF even after the set period of time has elapsed after the center staple paddle lift motor/C (M26) is turned ON.Description: Center-staple paddle up-down motor malfunction.3 M34 operation check - SD-508 G-3 to 4 4 Change M34 - 5 SDDB ICP12 conduction check - 6 Change SDDB - 7 Change FSCB 2 Check the connector of M34 for proper drive coupling, and correct as necessary. Remedy: 1 Check the motor and sensor connectors for proper connection, and correct as necessary.Causes: Exit motor (M34) SD drive board (SDDB) FS control board (FSCB).The exit motor (M34) lock signal remains set to H for a set period of time while the exit motor (M34) is turning.Description: Center-staple paper exit motor malfunction.3 PS33 I/O check, sensor check SDDB CN403-17 (ON) SD-508 C-10 4 M23 operation check SDDB CN406-1 to 4 (ON) SD-508 K-8 5 Change M23 - 6 SDDB ICP4 conduction check - 7 Change SDDB - 8 Change FSCB 2 Check the connector of M23 for proper drive coupling, and correct as necessary. Causes: Center staple motor (M23) Stapler home sensor (PS33) SD drive board (SDDB) FS control board (FSCB).The stapler home sensor (PS33) is turned neither ON nor OFF even after the set period of time has elapsed after the center staple motor (M23) is turned ON.Description: Center-staple stapler drive motor malfunction.Should you receive such product and find it unsatisfactory, you may return the product for an exchange or refund. Our Customer Care team will contact you in such cases, to make sure you are informed about the substitution. At such times, reserves the right to use different brands of product as long as they are equal in price, performance and quality to expedite the shipment of your order. Product Substitution Policy Occasionally severe back-orders or other conditions could cause a major delay in the delivery of your order. For complete information please see our Returns Policy. We try to make the return process as easy as possible. Non-defective or damaged product in unopened original packaging (subject to re-stocking fee).The product you bought was defective or damaged.We will send you a replacement or money back in the following cases: Our OEM and Compatible products are covered by 30-Days money back program. These cartridges are designed to meet or in some cases even exceed the standards set by the OEM in terms of performance, print quality and page yield. What is a Compatible Product? A compatible cartridge is a cartridge that is not produced by the Original Equipment Manufacturer (OEM). After that, you must contact the OEM company directly. We will handle all warranty issues within the first 30 days of receiving the product. That warranty will vary depending on which brand you are purchasing, and we recommend that you visit the OEM website for exact specifications. All OEM product comes with a warranty direct from the manufacturer.