Repairs - Epson QX-10 Technical Manual

4.1 Repairs
Before starting repairs
(1) Static electricity
• Human bodies carry the static generated by friction of the clothes, etc. If a man with a static
charge touches circuit elements with his fingers, for exemple, the static can break down the
elements. Before starting repairs, touch the case cover with both hands to discharge the static
that you may have in the body.
• When using an oscilloscope or other instrument whose ground terminal must be grounded,
contact the conductive part of the ground terminal with the
ci:J~ing
of the 0)(-10 or your fing-
ers, and then connect it to the GND terminal on the ci'"
;;t
board.
(2) Circuits
• Even if the power switch is pushed off, the RAMs and some of the ICs are backed up by the bat-
teries. When conducting a continuity test on circuits, disconnect the battery connector and
wait for about 30 seconds before starting the test.
• Follow the same procedure when replacing circuit elements on the control circuit board.
(3) Soldering
Refer to the section on soldering before making repairs on the circuit boards.
4-1