Siemens Hematek Operating Manual page 52

6. Flood both the front and back troughs with methanol to loosen any precipitated stain
that may be present. Take care not to splash methanol onto the circuit board.
7. Using an applicator stick with a cotton swab attached, wipe from right to left along the
length of the back and front troughs to remove the entire excess residue.
Figure 5-6. Cleaning the Back Trough
8. Clean other exposed areas that might be accidentally stained, including the rear guide
rail, in the same careful manner.
NOTE:
Ensure that you do not scratch the platen.
9. Return the circuit board cover to its normal position, between the circuit board panel
and the back edge of the screws, and tighten the two thumbscrews.
Be sure the panel is not resting on top of the screw heads before tightening.
Page 5—8, Section 5: Maintenance