Lexmark T620 Service Manual - Page 212

4069-5XX/7XX Adjustment Procedures Duplex Motor Drive Belts Do the duplex motor belt and drive belt adjustment whenever you remove or replace the duplex motor or loosen the motor or drive belt idler pulley. Service Tip: Excessive belt tension can result in stalling the duplex motor. Too little belt tension can result in belt slippage. To do the duplex drive belt adjustment: 1. Do the removal procedure "Duplex Front Cover Door" on page 4-21 to access the drive belt idler pulley. 2. Loosen the idler pulley mounting screw and position the idler to provide 3 mm (±.5 mm) drive belt deflection. 3. Tighten the idler pulley mounting screw being careful to maintain the adjustment. 4. Reassemble the duplex unit. To do the duplex motor belt adjustment: 1. Do the removal procedure "Duplex Motor" on page 4-22 to access the motor mounting screws but do not remove the motor. 2. Loosen the screw in the elongated adjustment slot and position the motor to provide 3 mm (±.5 mm) motor belt deflection. 3. Tighten both mounting screws being careful to maintain the adjustment. 4. Reassemble the duplex unit. 4-2 Service Manual