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Getting Service
Modulator High-Powered Omni Speaker (MOD Series)
Replacing the Driver
To determine if a driver is defective, refer to the procedure outlined in the installation
instruction for the amplier control unit or remove the speaker circuit from the terminal
block and measure the impedance of the circuit. The impedance of each 400 W cell of
the siren will measure approximately 4.5 ohms. If the reading is higher, (9 ohms), one
driver is bad. If the circuit is open, then either multiple drivers are bad or a wire has been
severed. The impedance of a single driver should be 2.25 ohms.
To determine the location of the bad driver refer to Figures 6 and 7.
To replace a defective driver:
1. Remove the four hex head 1/4-inch mounting bolts that are holding the inspection
plate. Make sure the at washer and split washer are not misplaced. Note the color
and location of the wires going to the driver.
2. Remove the wire from the terminals on the driver.
3. Remove the driver by turning it counterclockwise.
4. Add new driver by turning it clockwise.
5. Make sure that the male threads are greased.
6. Reconnect the wires as previously noted.
Ordering Parts
To order replacement parts, call Customer Care. See Getting Service.
Table 16 Replacement Parts
Description Part Number
Top Light Kit 191XL-024R
Side Light Kit MOD-QF-KIT
Driver, 100 watt K8570063A
Getting Service
If you are experiencing any difculties, contact Federal Signal Customer Support at:
800-548-7229 or 708-534-3400 extension 7511 or Technical Support at: 800-524-3021
or 708-534-3400 extension 7329 or through e-mail at: techsupport@fedsig.com. For
instruction manuals and information on related products, visit: http://www.fedsig.com/
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