Federal Signal Corporation PA300 Series Supplement Sheet

2561549B
REV. B 601
Printed In U.S.A.
A.

GENERAL.

The 100-watt output of the basic Model PA300
was designed to drive a single high power speaker.
However, the essential difference between models is
that the PA300-012-NYSB can drive one or two 11-
ohm impedance, high or low power speakers. When
two speakers are used they must be connected in
parallel.
B.

MANUAL CHANGES.

The following changes should be made to the
Model PA300 Installation and Service Instructions
(Part No. 255A198).
1. Page 2. Change the following paragraphs,
as shown below:
Frequency Range
Operating Current (14.0Vdc-WAIL)
1 Low Power Speaker
2 Low Power Speakers
1 High Power Speaker
2 High Power Speakers
Voltage Output (approx.)
1 Low Power Speaker
2 Low Power Speakers
1 High Power Speaker
2 High Power Speakers
2. Page 4, paragraph 3-3.A. Speaker. Change
to read:
A.

Speaker.

The unit is designed to operate with one 11-
ohm impedance speaker or two 11-ohm impedance
low power (58W) or high power (100W) speakers,
connected in parallel and in phase. On FEDERAL
speakers, this can be accomplished by connecting the
two speaker leads marked "1" to the SPEAKER
COMMON control cable lead and the two speaker
leads marked "2" to the SPEAKER HI POWER or
SPEAKER LO POWER control cable leads See the
Control Cable Wiring Diagram (new).
SUPPLEMENT SHEET
TO
MODEL PA300 SERVICE MANUAL
FOR MODEL PA300-012-NYSB
800 to 1800Hz
5 amperes
10 amperes
10 amperes
15 amperes
45Vp-p
40Vp-p
64Vp-p
60Vp-p
P5
1 2 3
4 5 6
7 8 9
10 11 12
*
NEVER CONNECT THE BROWN AND ORANGE SPEAKER
WIRES TOGETHER TO THE SPEAKER(S).

Control Cable Wiring Diagram.

Using 18 gauge wire, connect the speaker
leads (58W speakers to SPEAKER LO POWER and
100W speakers to SPEAKER HI POWER) as shown
in the Control Cable Wiring Diagram (new).
3. Page 7, Paragraph 4-3.E. HI-LO. Change to
read:
E. HI-LO.
This function is not available on the Model
PA300-012-NYSB.
4. Page 8, Paragraph 4-6. PRESS AND HOLD
FUNCTIONS. Change to read:
PRESS AND HOLD FUNCTIONS
Selector Press on
Switch Horn Ring
Position Produces
Manual Peak-and-
Hold
5. Page 14. Refer to the component location
diagram detail in this supplement to locate the
additional PA300-012-NYSB components (R59, R60).
6. Page 15. A Model PA300-012-NYSB sche-
matic diagram is included in this supplement sheet.
BLU
SPEAKER, COMMON
*
ORN
SPEAKER, LOW POWER(58W)
*
BRN
SPEAKER, HIGH POWER(100W)
BLK
(NEG.) (-)
GRN
CHASSIS GROUND
RED
(POS.) (+)
WHT/YEL
HORN RING
WHT
BRN
VEHICLE TWO-WAY
BRN
RADIO SPEAKER
290A3859
Release of
Horn Ring
Produces
Coast down
and silence
HORN