IBM 4247-003 Maintenance Manual - Page 279
Service Checks and Adjustments, Carriage Drive Belt, Service Check
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Service Checks and Adjustments Carriage Drive Belt Service Check 1. Power off (O) the printer. 2. Remove the ribbon cartridge. See "Ribbon" on page 353. 3. Move the printhead to the right side stop. 4. Using a push-pull scale (such as IBM P/N 460870) to check the belt tension, apply pressure to the upper half of the belt (at a point midway between the printhead and the left side frame) until it begins to touch the bottom half of the belt. To accurately measure the tension, it is critical for the raised surfaces of the teeth to align, as shown in Figure 51. The correct force required to bring the top of the belt into contact with the bottom of the belt is 0.9 ±0.05 kg (2.0 ±0.1 lb). 5. If the measurement is correct, the service check is complete. Stop here and return to the step that sent you here. If the measurement is not correct, go to the adjustment. Adjusting Screw Apply Force Here e90acb3 Figure 51. Carriage Belt. (Viewed From Top) - Teeth must align during measurement. Chapter 5. Removals and Adjustments 279
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