Replacing The Driver; Ordering Parts; Getting Service; Table 16 Replacement Parts - Federal Signal Corporation Modulator MOD Series Description, Specifications, Installation, And Service Manual

Getting Service

Replacing the Driver

To determine if a driver is defective, 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 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
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
Top Light Kit
Side Light Kit
Driver, 100 watt
Getting Service
If you are experiencing any difficulties, 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/
24
plate. Make sure the flat washer and split washer are not misplaced. Note the color
and location of the wires going to the driver.
Part Number
191XL-024R
MOD-QF-KIT
K8570063A
Modulator High-Powered Omni Speaker (MOD Series)