IBM 6400 series Maintenance Manual page 220

Installation
NOTE: 6400–050, –P50, –010, –P10, –014, and –015 printers must use the
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.
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
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 N m). 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.
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
b. If print quality is still degraded, replace the shuttle frame assembly
220
CMX 040 controller board.
or broken parts can be seen in the assembly.
(page 159).
(page 249).
Replacement Procedures and Illustrated Parts List
ATTENTION
ATTENTION