Epson PX-8 Technical Manual page 238

REV.-A
5.4.3
Repairing The Keyboard
Before repairing the keyboard. perform the followin.g checkes:
1) Visually check the keyboard circuit board for any damage.
2) Visually check the keyboard information cable connectors for any damage.
3) Visually check the keyboard's internal components such as the circuit board, FPC pattern, and
switches, for any foreign matter such as water drops.
4) Visually check the circuit board for any FPC pattern separation.
If damaged components which cannot be repaired are found in steps 1 or 2, replace the keyboard.
If any foreign matter was found in check 3), clean and dry ,the components at
the normal temperature. After components are dry, test the keyboard functions again.
If a problem still exists, replace the keyboard.
(Even if the trouble disappears, it is possible that it may reoccur at another time due to oxidation
of the circuit board patterns. If this occurs the keyboard may have to be replaced.
Printed circuit pattern separations may be fixed by a combination of a hot press and adhesive. If
unrepairable, replace the unit.
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