SERVICE MANUAL
Medi-Therm II
REPAIR PROCEDURES
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Wear a static control device connected to the chassis ground to
prevent electrostatic discharge. (See figure 5, p. 35.)
Electrostatic discharge can damage circuitry on PC boards.
Control/Display Board Removal (refer to figure 8, p. 67):
1.
Unplug the power cord.
2.
Disconnect the 26 conductor cable harness assembly from the control/
display board at J1.
3.
Unfasten the patient probe assembly J1 from the head by removing the
hex nut and pull the assembly from its mounting hole.
4.
Remove the six (6) board mounting screws and one standoff.
5.
Push aside the ground harness and transformer cable and lift board
enough to gain access to the PC board.
6.
Disconnect the digital control panel from the board at J4 and the patient
probe assembly from the board at J2.
NOTE: These connectors have locking tabs that must be pressed in order
to disengage them from the board.
Use care when disconnecting the digital control panel ribbon
from the control board.
Folding the ribbon cable may cause failure of the
control panel.
7.
Lift board out of cover.
Control/Display Board Installation (refer to figure 8, p. 67):
1.
Unplug the power cord.
2.
Place the new control/display board in head.
3.
Install the six (6) board mounting screws and one standoff as follows:
a.
Install 3 board screws through the ground harness into the board.
NOTE: Insure that the corner screw also connects the ground
wire of the patient probe assembly to the board.
b.
Install the standoff through the middle mounting hole on the board’s
edge. Insert 2 board screws through the transformer cable retaining
clips; mount one to the standoff, install the other directly through
the board.
c.
Install the remaining board screw through the board.
9.3
REPLACING THE
CONTROL/DISPLAY
BOARD
CAUTION
CAUTION
61
