IBM 6400 Maintenance Information Manual page 213

Installation
NOTE: 6400-050, -P50, -010, -P10, -014, -015, -C05, and -C5P 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.
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
you see broken parts 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 34, page
214.)
4. Install the mounting screws from the replacement kit. Using a Torx** T-10
bit adapter, torque each screw to 14 inch-pounds (1.58 N•m). Tighten the
center screw(s) first. (See Figure 34, page 214.)
5. Install the hammer bank cover assembly (page 200).
6. Install the shuttle frame assembly (page 242).
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 134):
a. If print quality is acceptable, return the printer to normal operation
(page 153).
b. If print quality is still degraded, replace the shuttle frame assembly
(page 242).
Hammer Spring Assembly
ATTENTION
ATTENTION
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