Federal Signal A12W Serie Manual De Instalación Y Mantenimiento página 6

more dead cells.
2. Check for proper installation of batteries in cartridge.
3. Reinstall cartridge and batteries in handle and partially
disassemble electronic megaphone as follows:
a. Remove screw which secures clip and dee (7).
b. Remove the three Phillips head microphone
housing screws. Lift microphone housing (17) away
from microphone (16) .
c. Gently lift microphone (16) away from foam pad
and place slightly to one side of assembly. Lift the
foam pad partially away from the horn assembly until
the truss head screw is exposed. Remove truss head
screw.
d. Place electronic megaphone on its side. Carefully
rotate driver assembly (1) 1/8-turn to the left and
pull driver assembly from horn as far as wires from
microphone and handle will permit.
4. Hold switch button depressed. With a voltmeter,
check for 12VDC between P1 pins 2 and 4 on the
amplifier PC board (4) (see figure 4). If correct voltage
is not obtained, remove handle and check switch and
all connections in handle.
For driver assembly and microphone checks,
a 1-1/2 volt battery (D cell) with wires soldered
to each end will be required.
5. Check driver assembly (1) . Disconnect displacement
connector (red insulation) from the amplifier printed
circuit board. Momentarily touch the wires from the
D-cell across J1 pin 5 and 6 of the red connector
(not the connector on the PC board). If no "click" is
heard as the connection is made and broken, check
for defective wires or connections at the speaker
terminals. If wires and connections are proper, the
driver assembly is defective and should be replaced.
6. If the previous checks do not reveal trouble, the
amplifier assembly is defective and should be
replaced or repaired.
NOTE
Amplifier assembly must be oriented on
speaker assembly so that volume control will
be directly opposite access hole in horn.
7. If amplifier assembly is replaced, volume control may
need readjustment (refer to OPERATION (NOTE).
Talk test electronic megaphone and advance volume
control until feedback occurs, then retard control
slightly.
8. Reassemble electronic megaphone.
When fastening microphone housing to horn
assembly, insure that microphone wires run
straight into the hole in the horn assembly
and are not captured under the rim of the
housing.
B. No sound reproduced, but "click" is heard
in speaker when switch button is depressed. Also,
reproduction very distorted and/or weak output.
1. Remove microphone housing screws and check wire
connections at microphone.
2. Partially disassemble electronic megaphone (refer to
3-4.A.3).
3. Check continuity of microphone wire.
4. Disconnect displacement connector (red insulation)
from the amplifier printed circuit board. Momentarily
touch the wires from the D-cell across P1 pins 1 and
2 of the red connector. Clicks should be heard as the
connection is made and broken. If no click is heard,
the microphone is defective. Replace microphone.
5. If the previous steps do not reveal the trouble,
the amplifier assembly is defective and should be
replaced.
6. If the microphone or amplifier is replaced, the volume
control may need adjustment (refer to OPERATION
NOTE ).
4
NOTE
NOTE