4-3. DRIVER REPLACEMENT
To determine if a driver is bad refer to the procedure outlined in the installation instruction
for the amplifier control unit or remove the speaker circuit from the terminal block and
measure the impedence of the circuit. The impedence will measure approximately 2.7 ohms.
If the reading is higher (5.4 ohms) one driver is bad. If the circuit is open, then either both
drivers are bad, or a wire has been severed.
To determine the location of the bad driver refer to the wiring table in Section 3 and Figure
3-3.
To replace a defective driver remove the four Hex head 1/4 inch mounting bolts that are
holding the inspection plate. Make sure the flat washer and split washer are not misplaced.
Note the color and location of the wires going to the driver. Remove the wire from the
terminals on the driver. Remove the driver by turning it counter clockwise. Add new driver
by turning it clockwise. Make sure that the male threads are greased. Reconnect the wires
as previously noted. Reinstall the inspection plate.
