REMOVE AND REPLACE A MALFUNCTIONING PRINTED CIRCUIT BOARD
You have isolated a malfunctioning PCB. Refer to figures 1-3, 2-2, and 2-6.
a. Turn off the unit.
b. Remove power from the unit.
c. Unplug the foot switch from the unit.
d. Unplug the hand piece from the unit.
e. Remove the back six screws.
f. Remove the back cover.
g. Remove the intensity knob.
h. Access the PCB.
i. Remove and replace the PCB. Mark all wires and connectors so that they can be
properly reconnected (figure 2-6).
Reassemble the unit.
k. Perform an operational checkout. Refer to paragraphs 1-7c(1) through (9).
l. Perform calibration tests (refer to paragraphs 1-9a, b), safety test to
manufacturer's specifications, and return the unit to service.