IBM 6400-I15 Maintenance Manual - Page 220

Installation NOTE: 6400-050, -P50, -010, -P10, -014, and -015 printers must use the CMX 040 controller board. 1. Using a clean dry cloth, wipe the hammer spring mounting surface on the hammer bank. Make sure the cloth does not leave lint on the hammer bank. ATTENTION Hammer springs and hammer tips are fragile. Do not touch the hammer springs or tips. Handle hammer springs by the thick mounting base only. Apply pressure only to the mounting base. NOTE: Replace a hammer spring assembly only if there is visible damage or broken parts can be seen in the assembly. 2. Handling it by the mounting base only, remove the new hammer spring assembly and mounting screws from the box. 3. Handling the hammer spring assembly by the mounting base only, carefully position the new hammer spring assembly onto the hammer bank mounting pins and press it into position with the flat end of the stick supplied in the hammer spring replacement kit. (See Figure 33, page 221.) 4. Install the mounting screws from the replacement kit. Using a Torx** T-10 bit adapter, torque each screw to 14 in-lbs (1.58 NSm). Tighten the center screw(s) first. (See Figure 33, page 221.) 5. Install the hammer bank cover assembly (page 206). 6. Install the shuttle frame assembly (page 249). 7. Install the ribbon and load paper. ATTENTION Do not attempt to adjust or "tweak" hammer springs. 8. Run a Customer Engineer Test and check print quality (page 140): a. If print quality is acceptable, return the printer to normal operation (page 159). b. If print quality is still degraded, replace the shuttle frame assembly (page 249). 220 Replacement Procedures and Illustrated Parts List