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1. Remove the TM33 from the edge connector on the SelecTone speaker/amplifier or control
unit. Remove and retain the four screws and washers that attach the cover to the circuit
board. See figure 1.
2. Carefully remove the current message chip, labeled as U1 on the circuit board, from the
socket. An IC extractor tool is the preferred method of removing the chip; however, the chip
may also be pried carefully from the socket with a small flat-blade screwdriver.
3. Carefully install the message chip into the socket by aligning it with the silkscreened
outline on the circuit board. See figure 3. Check that all of the pins are fully seated in the
socket. The message chip must be installed correctly for proper operation. Replace the
cover on the circuit board by reinstalling the four screws and washers that were previously
removed. Carefully place the TM33 into the edge connector on the Selectone speaker/ampli-
fier unit. Ensure that the four washers are located between the circuit board and the plastic
enclosure.
4. Test the TM33 to ensure that the message chip was properly installed by activating the
SelecTone unit.
G. Maintenance.
SAFETY MESSAGE TO MAINTENANCE PERSONNEL
• Read and understand all instructions before performing any maintenance to this unit.
• To reduce the risk of electrical shock or ignition of hazardous atmospheres, do not perform main-
tenance/service on this device when circuits are energized.
• Any maintenance to the unit MUST be performed by a trained electrician in accordance with NEC
Guidelines and local codes.
• Never alter the unit in any manner. Safety in hazardous locations may be endangered if additional
openings or alterations are made in units specifically designed for use in these locations.
• The nameplate, which may contain cautionary or other information of importance to
maintenance personnel, should not be obscured if exterior of housings used in hazardous
locations are painted.
Failure to follow all safety precautions and instructions may result in property damage,
serious injury, or death to you or others.
Other than cleaning, no regularly scheduled maintenance is required. To ensure unit is
operating properly, it should be tested at regularly scheduled intervals.
In the event that volume adjustment, message module replacement, or repair is required,
refer to the Safety Message to Maintenance Personnel before proceeding.
H. Service.
The TM33 contains no user serviceable parts inside.
Federal Signal will service your equipment or provide technical assistance with any problems
that cannot be handled locally.
Any units returned to Federal Signal for service, inspection, or repair must be accompanied
by a Return Material Authorization. This R.M.A. can be obtained from the local Distributor or
Manufacturer's Representative.
At this time a brief explanation of the service requested, or the nature of the malfunction,
should be provided.
Address all communications and shipments to:
FEDERAL SIGNAL CORPORATION
Industrial Products
Service Department
2645 Federal Signal Drive
University Park, IL 60484-3167
-3-
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