IBM 4247-003 Maintenance Manual - Page 433
scrape the softened adhesive. Note: Do NOT scratch the aluminum casting.
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a. On the left side, near the ribbon drive motor, remove the 2 screws holding the aluminum profile through the rubber mounts. Note that the metal spacer sleeves are through both rubber mounts and that a star and flat washer are on the front screw. b. Rotate the ground strap upwards and use a small (P1) Phillips screwdriver tip to remove the one small screw holding the location of the black plastic sensor block. c. Drop the left end of this profile toward the Cut Sheet paper door surface. 6. Loosen the left end of the small diameter carriage support shaft: a. Remove the left end screw, ground strap and washer from the shaft. b. If there is an adjustor on the right end of the small shaft, mark the position of the adjustor to the side frame. Loosen the screw on the right end of the small shaft; do NOT remove. c. Flex the left side frame to allow dropping the left end of shaft and taking the bronze bushing from the carriage. 7. Position the carriage assembly just to the left of the cable clamp on the aluminum profile. Rotate the carriage downwards to move the ribbon mask away from the platen. Use the small shaft to hold the carriage downwards to gain good access to the front of the carriage. 8. Remove the old ribbon mask: a. Pull off the damaged ribbon mask. b. Wet a cloth with Isopropyl alcohol and wet the adhesive. This will soften the adhesive. Use a flat blade to scrape the softened adhesive. Note: Do NOT scratch the aluminum casting. c. Wipe the remaining adhesive with the solvent. Repeat the scraping and wiping process until all of the adhesive is gone. 9. Install the new replacement ribbon mask: a. Peel off the protective layer from the new ribbon mask, exposing the adhesive layer. b. Carefully align the lower edge of the mask into the carriage casting and press into contact. c. Verify that the mask is smooth with the casting surface. Carefully align the upper section along the crease of the lower section and in the casting. Note: If the mask is NOT smooth with the casting surface it will catch the edges of the paper. Pull the mask off and install another new mask. Chapter 5. Removals and Adjustments 433