IBM 6400 series Maintenance Manual page 32

The thin plate (ribbon mask) of the hammer bank cover assembly is
fragile. Be careful not to over-bend or kink the ribbon mask when
handling and cleaning the hammer bank cover assembly.
7. Using a clean soft cloth, wipe the hammer bank cover and ribbon mask
to remove lint, ink, and paper residue. Clean the holes in the cover strips.
Carefully wipe between the hammer bank cover and the ribbon mask
(early models).
Do not use any solvents or liquids to clean the hammer tips. Clean the
hammer tips gently—too much pressure can chip hammer tips.
8. Using a stiff, non-metallic brush (such as a toothbrush), gently brush the
hammer tips to remove lint and ink accumulations. (See Figure 6.)
Vacuum up any residue.
Hammer
The hammer bank contains a strong magnet. To prevent damage to the
hammer tips, do not let the hammer bank cover assembly snap into
place as the hammer bank magnet attracts it. Any impact of the cover
against the hammer bank can break hammer tips.
9. Install the hammer bank / ribbon mask cover assembly (page 206).
10. Install the shuttle frame assembly (page 249).
11. Install the shuttle cover assembly (page 209).
12. Clean the card cage fan assembly, as described below.
32
Tip
Figure 6. Cleaning the Hammer Tips
ATTENTION
ATTENTION
NOTE: 6400–004/04P
hammer bank shown.
Procedure is the same for
all hammer banks.
ATTENTION
Preventive Maintenance