MODEL 300MB-SD - Federal Signal

256A1078H 

REV H 1009 

Printed in U.S.A. 

MODEL 300MB-SD 

CommCenter 

Series D1 

INSTALLATION AND SERVICE INSTRUCTIONS

Warranty – Seller warrants all goods for five years on parts and 2-1/2 years on labor, under the following 

conditions and exceptions: Seller warrants that all goods of Seller's manufacture will conform to 

any descriptions thereof for specifications which are expressly made a part of this sales contract and at 

the time of sale by Seller such goods shall be commercially free from defects in material or workmanship. 

Seller reserves the right at the Seller’s discretion to “Repair and Return” or “Replace” any item 

deemed defective during the warranty period. This warranty does not cover travel expenses, the cost of 

specialized equipment for gaining access to the product, or labor charges for removal and reinstallation 

of the product. This warranty shall be ineffective and shall not apply to goods that have been subjected 

to misuse, neglect, accident, damage, improper maintenance, or to goods altered or repaired by anyone 

other than Seller or its authorized representative, or if five years have elapsed from the date of shipment 

of the goods by Seller with the following exceptions: lamps and strobe tubes are not covered under this 

warranty. Outdoor warning sirens and controllers manufactured by Federal Warning Systems are warranteed 

for two years on parts and one year on labor. No agent, employee, representative or distributor 

of Seller has any authority to bind the Seller to any representation, affirmation, or warranty concerning 

the goods and any such representation, affirmation or warranty shall not be deemed to have become a 

part of the basics of the sales contract and shall be unenforceable. THE FOREGOING WARRANTIES 

ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OR MERCHANTABILITY, 

FITNESS FOR PURPOSE AND OF ANY OTHER TYPE, WHETHER EXPRESS OR IMPLIED. 

These warranties shall not apply unless Seller shall be given reasonable opportunity to investigate all 

claims for allegedly defective goods. Upon Seller's instruction a sample only of allegedly defective 

goods shall be returned to Seller for its inspection and approval. The basis of all claims for alleged defects 

in the goods not discoverable upon reasonable inspection thereof pursuant to paragraph 8 hereof 

must be fully explained in writing and received by Seller within thirty days after Buyer learns of the 

defect or such claim shall be deemed waived. 

2645 Federal Signal Drive • University Park, IL 60466 

Tel: 708-534-4756 • Fax: 708-534-4852 

elp@fedsig.com • www.federalsignal-indust.com

TABLE OF CONTENTS 

Paragraph Page 

SECTION I - GENERAL DESCRIPTION 

1-1 General ................................................................................................................... 1-1 

1-2 Chassis Description................................................................................................ 1-1 

SECTION II - SPECIFICATIONS 

2-1 Power Input ............................................................................................................ 2-1 

2-2 Emergency Power Source Input ............................................................................ 2-1 

2-3 Audio/Cascade Input .............................................................................................. 2-1 

2-4 Audio Outputs ........................................................................................................ 2-1 

2-5 Remote Tone Activation Circuit ............................................................................ 2-2 

2-6 Physical ................................................................................................................... 2-2 

SECTION III - INSTALLATION 

3-1 Unpacking .............................................................................................................. 3-1 

3-2 Kit Contents ........................................................................................................... 3-1 

3-3 Input Configuration ............................................................................................... 3-1 

3-4 Control Circuitry .................................................................................................... 3-1 

3-5 Power ...................................................................................................................... 3-2 

3-6 Audio Input............................................................................................................. 3-2 

3-7 Signal Lines ............................................................................................................ 3-3 

3-8 Model 300MB Signal Connections ........................................................................ 3-3 

3-9 Connection to Remote Devices .............................................................................. 3-3 

3-10 300MB Power Connections .................................................................................... 3-4 

3-11 Typical Installations .............................................................................................. 3-4 

3-12 Storage Chip Installation ...................................................................................... 3-7 

SECTION IV - SERVICE 

4-1 General ................................................................................................................... 4-1 

4-2 Replacement Parts ................................................................................................. 4-1

1-1. GENERAL. 

The CommCenter, Model 300MB Series D, is a digital 

playback device that is capable of generating up to 

six different prerecorded voice messages, melodies, tones 

and/or signals. This central control device interfaces 

with any decentralized or centrally amplified system. 

The CommCenter can control signal lines to Federal 

Signal SelecTone® Models 300GC, 300GCX, 300X, 

302GC, 302GCX, 302X, and 50GC speaker/amplifiers. 

It can also interface with any SelecTone Control Unit, 

Models 300VSC-1 or 300SCW-1. It can directly drive 

speakers designed for 25Vrms line operation. It can 

also provide a 1Vp-p audio signal, and can be used as a 

remote audio input for a public address sound system. 

Using the 300MB’s cascading function, CommCenters 

can be linked together to provide a system with the 

capability of more than six messages. 

NOTE 

The CommCenter accepts messages stored on ICs 

and pluggable circuit boards. Both are referred to 

as message chips in this manual. 

The messages stored on pluggable circuit boards 

will operate on all Series B, Series C, and Series D 

Models. 

The Series D CommCenters use a different storage 

IC than the Series A, Series B, and Series C. 

These ICs cannot be interchanged between Series 

A, Series, B, and Series C models. 

Make sure to specify which series CommCenter 

you have before ordering any additional messages. 

The CommCenter is intended to be installed in 

indoor (NEMA 1) or other protected installations only. 

It can be mounted on any horizontal or vertical surface 

using #10 screws, appropriate for the type of mounting 

surface material, and the four mounting holes in the 

300MB’s housing (see figure 1-1). 

1.08 

2.86 

3.57 

KNOCKOUT PROVISION 0.87 DIA., 5 PLACES 

FIELD WIRING BLOCK FOR 120/240V POWER 

CONNECTION 

2.27 

1.06 

SECTION I 

GENERAL DESCRIPTION 

9.41 

2.20 

6.77 

1.28 

3 

1.18 9.75 

1-1 

The CommCenter can be used for a variety of prioritized 

signaling purposes, such as indicating the status 

of a machine or process, background messages, evacuation, 

alarm, start and dismissal, and other audible 

notification applications. The system can be automated 

if external (customer-supplied) devices such as programmable 

controllers, heat detectors, switches or program 

clocks are connected to the remote inputs. This product 

is not listed for fire use. 

A CommCenter plays and amplifies messages 

through signal lines to the remote SelecTone devices in 

the system. To connect the SelecTone speaker/amplifier 

to the signal line, a Model 300CK Connector Kit is 

required in each SelecTone device. Speakers designed 

for 25 volt operation can connect directly to the 25 volt 

output. 

Each message can be activated by a contact closure 

or opening at its associated remote control input. The 

remote control inputs can be configured to work with 

either latching or momentary contacts. 

1-2. CHASSIS DESCRIPTION. 

The CommCenter is assembled in a black, powdercoated 

steel, 2-piece housing. The cover is attached to 

the housing with four screws, two along each long edge 

of the enclosure. The rear of the housing incorporates 

two field wiring compartments baffled off from the 

printed circuit board area. One compartment is for the 

connection of the Class II power and signal lines, and 

the other is for the connection of the Class I power lines. 

These areas are provided with knock-outs to allow the 

external wiring to enter the unit through appropriate 

installer-supplied bushings. 

Each CommCenter can accommodate up to six storage 

chips, selected from a library of prerecorded voice 

messages, melodies, tones and/or signals. There is one 

message per storage chip. Each chip plugs into a 28-pin 

IC socket. The six sockets are labeled Priority Tone 1 

through Priority Tone 6 (see figure 1-2). 

11.57 

4 1 

Figure 1-1. Mounting Holes and Dimensions. 

2 

2.15 

6.87 

COVER REMOVED 

TO SHOW FOUR 

MOUNTING HOLES 

0.20 DIA., FOR 

#10 SCREWS 

290A2664-18

C7 

C9 

C13 

C129 R69 

R68 

R67 

+ 

C115 

+ 

C97 

+ 

+ C128 

C96 C112 

C5 

IC25 

IC25 

IC12 

IC16 

+ 

STD 

R1 

IC7 

IC9 

IC4 

R101 

R132 

PRIORITY 

TONE 2 

R123 

PRIORITY 

TONE 3 

PRIORITY 

TONE 4 

R131 

PRIORITY 

TONE 5 

IC17 R126 

+ 

TB1 

CR7 

CR11 

J1 

C127 

IC24 

1 

IC24 

R12 

PRIORITY 

TONE 1 

R136 

R127 

R117 

C125 

R10 

R11 

R13 

R135 

C8 

R120 

PRIORITY 

TONE 6 

R116 

ALT 

C6 

C10 

R66 C14 

C111 

C94 

C108 

C92 

C11 

C15 

1 

R110 

R102 

R134 

R129 

R125 

R122 

R115 

R111 

R113 

R128 

C121 

C106 

C89 

C120 

R133 

C104 

R124 

R119 

C88 

IC5 

U4 

U2 

U5 

R112 U1 

CR10 

CR13 

IC1 

U6 

R14 

C16 

C93 

IC17 

C118 

IC22 

IC22 

IC16 

C124 

U3 

R15 

C107 

R114 

C119 

IC7 

C126 

IC9 

C110 

IC12 

C91 

R94 

C116 

C17 

+ 

C133 

C102 C117 

+ 

C87 

+ 

+ 

C132 

+ 

CR1 

C2 

C12 R90 R91 TB3 

R95 R96 

C109 

C131 

R130 

C103 C130 

C114 

R118 

C100 

C122 

R61 

R63 

C105 

R76 

C113 

C86 

C99 

C95 

+ 

R109 

C98 

C123 

R99 

R108 

R121 

C101 

C90 

R65 

R83 

R92 

C24 

CR8 

CR9 

R2 

IC6 

R19 

R21 

R105 

IC13 

R100 

R78 

R106 

IC19 

R74 

R79 

C1 

R16 

R60 

R62 

IC23 

R J6 M 1R 

J7 M R J8 M 

NO NO 

J9 NC J10 NC NO J11 NC 

R J12 M R J14 M R J13 M 

R103 

R72 

R82 

R75 R88 

R58 

TONE1 

C46 

R3 

NO J3 NC NO J4 NC NO J5 NC 

TONE6 

R70 

IC10 

R80 

R84 

IC11 

TONE5 

TONE2 

C45 

R81 

R107 R104 

R59 

R73 

R89 

R87 

CR6 

R20 

TONE3 

R93 

R97 

C49 

C48 

R45 

R46 

Figure 1-2. Model 300MB Series D Mother Board. 

1-2 

C47 

R77 

IC2 

TONE4 

+ 

R4 

R5 

R17 R18 

IC8 

R31 

R32 

C37 

R33 

R34 

R35 

R71 

IC18 

C84 

C85 

R22 

R6 

R7 

C18 

C77 

R44 

V 

O 

L 

I 

V 

C3 

C78 

C29 

L1 

+ 

R8 

IC14 

T1 

1 

CR3 

R36 

R26 

IC20 

K1 

C50 

C51 

C79 

K2 

C38 

CR12 

R47 

C68 

C73 

CR4 

R37 

CR2 

C53 

C52 

+ 

C80 

C4 

C31 

Q2 

C69 

C82 

JU3 

Q1 

C39 

R48 

C74 

R39 

R40 

C54 

R49 

C70 

C30 

IC15 

C75 

J2 

R27 

C81 

R9 

IC21 

C83 

TB2 

JU1 

B W 

JU2 

CR5 

Q3 

GMC-1/2A 

F2 

GMC-1A 

C32 

C55 

R28 

C71 

R51 

C72 

C76 

F1 

SW1 

R50 

R52 

290A2922B 

200D1148 G 250V 240V 120V 250V

2-1. POWER INPUT. 

SECTION II 

SPECIFICATIONS 

A. Input Voltage ................................................................................ 120/240 V, 50/60 Hz 

B. Standby Current .......................................................................... 50 mA 120 Vac 

C. Operating Current ...................................................................... 210 mA (MAX) 

D. Power Consumption ..................................................................... 26 W (MAX) 

2-2. EMERGENCY POWER SOURCE INPUT. 

A. Input Voltage ................................................................................ 22–32 Vdc 

B. Standby Current .......................................................................... 90 mA 

C. Operating Current ....................................................................... 760 mA 

2-3. AUDIO/CASCADE INPUT. 

Cascade Input 

Input Impedance ................................................................................. 5k ohms 

Input Voltage ....................................................................................... 1 V p-p (MAX) 

2-4. AUDIO OUTPUTS. 

A. Output Impedance 

Unbalanced Sig. Line ............................................................. 25 ohms (MAX) 

Unbalanced Sig. Line Standby ............................................... 120 ohms 

Balanced Sig Line ................................................................... 40 ohms (MAX) 

Low Level Sig. Out ................................................................. 600 ohms 

B. Output Voltage Levels No Load (

2-5. REMOTE TONE ACTIVATION CIRCUIT. 

Message can be initiated by connecting the initiating line to CommCenter Ground by means of a dry 

contact or open collector. 

2-6. PHYSICAL. 

Weight ........................................................................................... Shipping 6-5/8 lb (3.01 kg) 

Net 5-1/2 lb (2.49 kg) 

Dimensions (HWD) ...................................................................... 2.28" x 9.41" x 11.57" 

Operating Temperature ............................................................... 32°F (0°C) to 120°F (49°C) 

2-2

Failure to follow all safety precautions and 

instructions may result in property damage, 

serious injury, or death to you or others. 

SAFETY MESSAGE TO INSTALLERS 

Peoples lives depend on your safe installation of our 

products. It is important to follow all instructions shipped 

with the products. This device is to be installed by a trained 

electrician who is thoroughly familiar with the National 

Electric Code and will follow the NEC guidelines as well as 

local codes. 

The selection of the mounting location for the device, 

its controls and the routing of the wiring is to be accomplished 

under the direction of the Facilities Engineer and 

the Safety Engineer. In addition, listed below are some 

other important safety instructions and precautions you 

should follow: 

• Although your signaling system is working properly, 

it may not be completely effective. People may not hear or 

heed your warning signal. You must reconize this fact and 

proceed with due caution. 

• Read and understand all instructions before installing 

or operating this equipment. 

• Do not connect or service this unit when power is on. 

• Optimum sound distribution will be severely reduced 

if any objects are in front of the speaker. You should ensure 

that the front of the speaker is clear of any obstructions. 

• All effective warning speakers produce loud sounds 

which may cause, in certain situations, permanent hearing 

loss. You should take appropriate precautions such as wearing 

hearing protection. 

• All effective warning speakers produce loud sounds, 

which may cause, in certain situations, permanent hearing 

loss. The device should be installed far enough away 

from potential listeners to limit their exposure while still 

maintaining its effectiveness. The OSHA Code of Federal 

Regulations 1910.95 Noise Standard provides guidelines 

which may be used regarding permissible noise exposure 

levels. 

• After installation, test the sound system to ensure 

proper operation. 

• Show these instructions to your Safety Engineer and 

all operating personnel and then file them in a safe place 

and refer to them when maintaining and/or reinstalling the 

unit. 

• Establish a procedure to routinely check the sound 

system for proper activation and operation. 

SECTION III 

INSTALLATION 

3-1 

3-1. UNPACKING. 

After unpacking the Model 300MB, examine 

it for damage that may have occurred in transit. If 

the equipment has been damaged, do not attempt to 

install or operate it, file a claim immediately with the 

carrier stating the extent of the damage. Carefully 

check all envelopes, shipping labels and tags before 

removing or destroying them. Before attempting to 

install the CommCenter, be sure that all parts listed 

in the KIT CONTENTS LIST have been supplied. 

3-2. KIT CONTENTS. 

Qty. Description Part No. 

1 Plug, 10 Position 140A332-10 

1 Plug, 17 Position 140A332-17 

3-3. INPUT CONFIGURATION. 

The CommCenter can be configured for remote 

activation in four ways: 

• Normally open latching contacts. 

• Normally open momentary contacts. 

• Normally closed latching contacts. 

• Normally closed momentary contacts. 

The unit is factory set to be activated by closing 

a normally open latching contact between the 

associated input and circuit ground. When activated 

the message will continue to loop and repeat. It will 

stop as soon as it is deactivated. When configured for 

momentary activation, the message will continue to 

loop and repeat until the input is deactivated. Upon 

deactivation of the input, it will play the entire message 

before stopping. 

Each of the six inputs can be individually configured 

by moving a two position jumper on a three 

position header. See table 3-1 for a list of the Priority 

Tones, their associated jumper designation and their 

marking as shown on the printed circuit board silkscreen. 

3-4. CONTROL CIRCUITRY. 

A. The control circuitry in the CommCenter 

has a built-in priority level feature. If a given message 

is already sounding when a higher priority 

message is activated, the higher priority message 

automatically overrides the lower priority message. 

When the higher priority message is deactivated, the 

lower priority message is initiated as long as it is still 

activated. The messages are prioritized with Priority 

Tone 1 having the highest priority down to Priority 

Tone 6. The cascade input has the lowest level of 

priority.

MESSAGE Jumper Marking Jumper Marking 

PRIORITY J9 NO NC J12 R M 

TONE1 


TONE 2 


TONE 3 


TONE 4 


TONE 5 


TONE 6 

Notes: 1. NO NC configures an individual channel 

to interface to normally open (NO) or normally 

closed (NC) contacts. 

2. R M configures an individual channel 

to interface to a latched contact (R) or a momentary 

contact (M). 

Table 3-1. 

B. A message can be activated from the 

tone activation inputs on TB1. A dry contact, either 

normally open or normally closed depending on the 

configuration, connected between the associated message 

(TB1-1 through TB1-6) and COM (TB1-7) will 

activate a tone. The configuration of these channels 

is described in paragraph 3-3. These inputs are opto 

coupled to reduce the possibility of noise on the signal 

lines falsely activating a message. 

C. There are two sets of contacts which can be 

used to monitor the status of a CommCenter. When 

power is applied, a relay with form C contacts is 

activated. These contacts are connected to TB2 and 

are labeled Power Monitor Relay. The second set of 

contacts monitor activation of any of the six messages 

or a cascaded input. These contacts are labeled Push 

To Talk (PTT) on TB1. 

Do not perform any installation or maintenance 

to the system when power is on. 

3-5. POWER. 

In order to prevent power to a CommCenter 

from being turned off accidentally, the unit does not 

have a power switch. A 300MB can be operated on 

either 120VAC, 50/60 HZ or 24VDC input power. 

3-2 


instructions may result in property damage 



on this system when power is on. 

This device is to be installed by a trained electrician 

who is thoroughly familiar with the 

National Electrical Code and will follow the 

NEC guidelines as well as local codes. 

The selection of the mounting location for this 

device, its controls, power supplied, and the 

routing of the wiring is to be accomplished 

under the direction of the facilities engineer 

and the safety engineer. 

If operation on 120VAC is desired, 120VAC is 

input through the 3-position field wiring terminal 

block located at the back of the unit. Two knock-out 

openings are provided. One knock-out should be 

removed and provided with a bushing through which 

the power lines can be routed into the field wiring 

compartment. The 300MB is factory set for 120VAC 

operation. If operation on 240VAC is desired, switch 

SW1 must be set to the 240V position. 

If operation on 24VDC is desired, 24VDC is input 

on the two terminals shown in figure 3-1. Remove 

the labeled jumper from terminals TB2-7 and TB2-8 

of terminal block TB2, before using these positions. If 

24VDC operation is chosen, a Class II power supply 

and its associated wiring should be installed. Refer to 

paragraph 3-4.D. if the power down option is desired. 

3-6. AUDIO INPUT. 

There is a provision for a low level, low impedance 

audio signal input at the rear of the unit. It has 

been designed to accept a cascaded input from a slave 

CommCenter, TB2-1, but it could be audio from a 

telephone system, radio receiver, CD player, or tape 

player. When the enable pin on the cascade input is 

pulled to circuit ground, TB2-2, audio on the cascade 

in signal line is gated through the CommCenter and 

output on the signal lines. As stated before, this input 

is the lowest priority. The audio level input should be 

1Vp-p. When cascading units, connect the slave unit’s 

enable signal out terminals to the master unit’s

GND 

enable and signal in terminals. The SIG COM terminals 

(TB1-16) of both uinits also need to be connected 

together as shown in figure 3-2. 

3-7. SIGNAL LINES. 

120/240 VAC 

CLASS I FIELD WIRING 

COMPARTMENT 

NOT USED 

NOT USED 

The signal lines transfer the messages from a 

CommCenter to the remote SelecTone devices. In 

order to reduce the possibility of cross talk, hum, and 

static noise pick-up, the signal lines must be twisted 

pair audio cable. In the majority of systems, use 

AWG 18 twisted pair audio cables. Shielded, twisted 

pair cable is recommended when the Class II signal 

circuit is in the vicinity of welding equipment, carbon 

arc equipment, or similar electrical devices. Never 

use a cable having wire smaller than AWG 22. 

Federal Signal Corporation does not recommend 

that new or existing telephone lines be 

used as signal lines in a SelecTone system for 

the following reasons: 

1. Interference from other services or 

systems, or interference from the 

system to other services. 

2. Cross talk, interference, or hum 

induced by other telephone lines. 

+ 24VDC 

- 24VDC 

POWER DOWN 

3. Extended downtime because of the 

second party involvement required to 

service the lines. 

POWER 

MONITOR 

RELAY 

NO 

NC 

COM 

KNOCK-OUTS IN REAR OF HOUSING 

CASCADE 

IN 

ENABLE 

SIGNAL 

Figure 3-1. Model 300MB Rear View. 

3-3 

OUTPUT LEVEL 

MIC OUT 

SIG COM 

SIG HI 

SIG 

25 VRMS 

LINE 

SIG 

CASCADE 

OUT 

SIGNAL 

ENABLE 

PTT 

RELAY 

COM 

NC 

NO 

COM 

MESSAGE 1 

MESSAGE 2 

MESSAGE 3 

MESSAGE 4 

MESSAGE 5 

MESSAGE 6 

TB2 TB1 

10 9 8 7 6 5 4 3 2 1 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 

MODEL 300MB REAR VIEW 

(BACK OF HOUSING IS REMOVED FOR CLARITY) 

CLASS II FIELD WIRING 

COMPARTMENT 

290A2923 

4. The additional cost of installation, 

interfacing devices and monthly 

charges as opposed to a one-time cost 

of performing the installation. 

3-8. MODEL 300MB SIGNAL CONNECTIONS. 

Mixing signal lines with power lines could 

cause electrical interference, which could 

impede or render the system inoperable. Do 

not install signal lines in the same conduit 

with power lines. 

To connect the signal lines of the SelecTone system 

to the 300MB, connect a color coded twisted pair 

of audio cables having conductors no smaller than 18 

AWG to SIG HI (TB1-15) and SIG COM (TB1-16) terminals 

on TB1 (see figure 3-1). Every remote Selec- 

Tone signaling device in the system will be connected 

in parallel to these lines. When connecting the remote 

devices in parallel to the signal lines, observe the 

correct polarity and install wire nuts over the connections. 

The yellow wires on the 300CK should be 

connected to the SIG HI while the blue wires should 

be connected to SIG COM. 

The 25Vrms speaker output is available at 

TB1-13 and TB1-14 for direct connection to ceiling 

speakers (see figure 3-1). Remove the labeled jumper 

from terminals TB1-13 and TB1-14 of terminal block 

TB1, before using these positions. Signal line losses

GROUND 

ENABLE 

SIGNAL 

CASCADE IN 

120/240 VAC 

10 2 1 

GAIN 

17 16 15 

CNTR 

1 

TB-2 TB-1 

GROUND 

SIG. HI (YEL) 

COM. (BLU) 

120/240 VAC 

CASCADE 

OUT 

SIGNAL 

ENABLE 

MASTER 

GAIN 

10 1 CNTR 16 12 11 1 

TB-2 

TB-1 

need to be considered when calculating how many 

speakers can be connected to the 300MB. 

3-9. CONNECTION TO REMOTE DEVICES. 

Physically install the remote SelecTone 

device(s). Follow the installation instructions packed 

with the device. 

A. 300GC, 300GCX, 300X, 302GC, 302GCX, 

302X and 50GC. 

MODEL 300MB 

A 300CK Printed Circuit Connector Board 

is required to connect a 300GC, 300GCX, 300X, 

302GC, 302GCX, 302X or 50GC to the signal lines. 

The 300CK properly terminates the signal lines to 

the amplifier in the 300GC, 300GCX, 300X, 302GC, 

302GCX, 302X and 50GC. As shown in figure 3-3, 

connect the blue wire on the 300CK to the COM. 

wire from the 300MB. Connect the yellow wire on the 

300CK to the SIG. HI wire from the 300MB. 

300GC 

300CK 

YEL BLU YEL BLU 

16 15 

COM SIG 

HI 

TERMINAL BLOCK (TB1) 

ON REAR OF 300MB 

300GC 

300CK 

Figure 3-3. 300CK Connections. 

SIGNAL LINES SHIELDED 

TWISTED PAIR 

3-4 

SLAVE 

MODEL 

300GC 

MODEL 

300CK 


YEL 

BLU 

Figure 3-2. Cascading Multiple Units. 

SHIELDED 

TWISTED PAIR 

SIGNAL LINE 

TO ADDITIONAL 

SELECTONES 

290A2664-17 

POWER LINES 

120 VAC 120 VAC 

LOCAL PWR. LOCAL PWR. 

B. 25 Vrms Signal Line Application. 

290A2718 

The CommCenter has provision for connecting 

25 Vrms line operated speakers to its output. 

Connect the 25 Vrms line at terminals TB1-13 and 

TB1-14 of terminal block TB1. Remove the labeled 

jumper from terminals TB1-13 and TB1-14 of terminal 

block TB1. Connect the speakers in parallel to 

this line using 25 Vrms line tap. This output is to be 

used only if there are no SelecTone system devices 

connected across TB1-15 and TB1-16. This output 

is not switched like SelecTone system output across 

terminals TB1-15 and TB1-16. 

C. Low Level Audio Output. 

The 300MB also has a 1 volt peak-to-peak 

audio output that can be connected to the audio input 

of another amplifier. This low level output is available 

across terminals TB1-16 and TB1-17 and is labeled 

as MIC OUT. It can also be connected to an analog 

fiber optic transmitter, allowing audio to be transmitted 

over a fiber optic link in an electrically noisy 

environment. 

3-10. 300MB POWER CONNECTIONS. 

Mixing signal lines with power lines could 

cause electrical interference, which could 

impede or render the system inoperable. Do 

not install power lines in the same conduit as 

signal lines. 

Operating power is connected to the 300MB 

through the 3-position field wiring terminal block lo

cated at the back of the unit. Two knock-out openings 

are provided. One knock-out should be removed and 

provided with a bushing through which the power 

lines can be routed into the field wiring compartment. 

If it is desired to use 24 VDC either as a primary 

or auxiliary source of power, remove the labeled 

jumper from terminals TB2-8 and TB2-7 of terminal 

block TB2. Connect the “+” terminal of 24 volt DC 

power supply to the terminal TB2-8 (+24 VDC) and 

“-” terminal of the 24 VDC power supply to the terminal 

TB2-7 of the TB2 terminal block located in the 

back of the 300MB (see figure 3-4). 

GROUND 

10 8 7 1 GAIN 171615 1 

CNTR 

TB-2 TB-1 

GROUND 

24 VDC 

POWER 

SUPPLY 

120/240 VAC 

CKT. 1 

CKT. 2 

+ 

- 

+ 

- 

NOT USED WITH MODEL PS300 

10 1 GAIN 171615 1 

CNTR 

TB-2 TB-1 


TWISTED PAIR 

120/240 VAC 


TWISTED PAIR 

Figure 3-4. Typical Central Power System. 


SIG. HI (YEL) 

COM. (BLU) 

Figure 3-5. Typical Selectone Installation. 

3-5 

3-11. TYPICAL INSTALLATIONS. 

A. SelecTone Installation (see figure 3-5). 

In this installation, the CommCenter is acting 

as a Selectone Control Center driving a 10Vrms 

signal line. Remote Speaker/Amplifiers have the 

signal coupled in through a 300CK. 

B. 300MB Interface with a 300VSC-1, 

300SCW-1, 300SSC (see figure 3-6 and 

table 3-2). 

In this installation the CommCenter is 

acting as a remote microphone audio input and adds 

message playback capability to a Selectone system. 

The gain adjustment on the 300MB needs to be adjusted 

such that the audio output is at the required 

MODEL 300GC 

24 VDC 

MODEL 300CK 




YEL 

BLU 

YEL 

BLU 

POWER 

LINES 

POWER LINES 

120 VAC 120 VAC 


290A2664-24C 

290A2664-19B

MODEL 300VCS-1 

GROUND 

10 1 GAIN 1716 10 8 1 

CNTR 

TB-2 TB-1 

120 VAC 

1 2 17 1 7 12 13 14 16 

TB-1 TB-2 


TWISTED PAIR 

SIG. HI (YEL) 

COM. (BLU) 

GROUND 

Figure 3-6. Models 300MB and 300VSC-1. 

300MB 300VSC-1/300SCW-1 300SSC 

TB1-8 PTT-NO TB2-13 PTT TB201-9 PTT 

TB1-10 PTT-COM TB2-7 GND TB201-8 COM 

TB1-16 SIG COM TB2-14 MIC COM TB201-8 COM 

TB1-17 MIC OUT TB2-12 MIC AUDIO IN TB201-7 AUDIO 

120/240 VAC 

120/240 VAC 

Table 3-2. 300MC Connections to 300VSC-1, 300SCW-1, or 300SSC. 


10 1 GAIN 17 1413 1 

CNTR 

TB-2 TB-1 

Figure 3-7. Model 300MB with 25VRMS Connections. 

3-6 

YEL 

BLU 

SIGNAL LINES 

SHIELDED 

TWISTED PAIR 




POWER 

LINES 

120 VAC 120 VAC 


TB1-13 

TB1-14 

290A2664-20B 

SIGNAL - 

SIGNAL + 

TO ADDITIONAL SPEAKERS, 40 OHMS MAXIMUM LOAD 

290A2664-21B

GROUND 

120/240 VAC 

10 1 GAIN 1716 1 

CNTR 

TB-2 TB-1 

AUDIO INPUT 


CENTRAL AMPLIFIER 

remote mic audio input level (16mVrms MAX.) for 

the 300VSC-1. Failure to adjust this level will cause 

distortion and clipping in the system. 

C. 300MB Driving a 25Vrms Speaker Line 

(see figure 3-7). 

In this installation the CommCenter is directly 

driving a speaker or speakers, the total power 

consumed not exceeding the drive capability of a 

CommCenter. 

D. 300MB Interfacing with a Central Amplified 

System (see figure 3-8). 

In this installation the CommCenter is 

acting as an audio input to a Central Amplifier. Message 

playback can be added to an existing Centrally 

Amplified Paging System. 

3-12. STORAGE CHIP INSTALLATION. 

NOTE 

The CommCenter accepts messages stored 

on ICs and pluggable circuit boards. Both are 

referred to as message chips in this manual. 

The messages stored on pluggable circuit 

boards will operate on all Series B, Series C, 

and Series D Models. 

The Series D CommCenters use a different 

storage IC than the Series A, Series B, and 

Series C. These ICs cannot be interchanged between 

Series A, Series, B, and Series C models. 


you have before ordering any additional 

messages. 

It is necessary to perform the procedures in 

this section ONLY if it is required to change 

the priority of the storage chips or adding a 

different message to the unit is required. 

The 300MB can accommodate up to six storage 

chips. The CommCenter should be shipped from the 

factory with the storage chips installed. Each storage 

SIGNAL LINES 

SHIELDED 

TWISTED PAIR 

Figure 3-8. Model 300MB with Central Amplifier Connections. 

3-7 

TB1-16 

TB1-17 

chip is marked with the Model Number and other 

information. 


instructions may result in property damage 



on this system when power is on. 

This device is to be installed by a trained electrician 

who is thoroughly familiar with the 

National Electrical Code and will follow the 

NEC guidelines as well as local codes. 

NOTE 

SIGNAL COMMON 

MIC. OUT 

TO ADDITIONAL SPEAKERS, 40 OHMS MAXIMUM LOAD 

290A2664-22B 

The Storage Chips and the CommCenter’s 

circuitry can be destroyed or damaged by 

static discharge. Observe anti-static procedures 

when installing or servicing a 

CommCenter. 

Storage Chips should be installed starting at 

Priority Tone 1 and working downward. If, for example, 

only four messages are required, have PT1 

through PT4 sockets occupied and leave PT5 and PT6 

open. 

To remove a storage chip gently pry it out of its 

socket. To install the storage chips insert them into 

the desired sockets on the printed circuit board as 

shown in figure 1-3. Ensure that the notch on the 

edge of the new storage chip is facing in the same 

direction as the old one (next to the resistors at the 

edge of the board) and that all pins are properly inserted 

in the socket—not bent under. 

Test the CommCenter after any maintenance 

is performed.

4-1. GENERAL. 

The Federal Signal factory will service your 

equipment or provide assistance with technical problems 

that cannot be handled satisfactorily locally. 

Any units returned to Federal Signal for service, 

inspection, or repair, must be accompanied by a 

Return Material Authorization. The 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: 

Service Department 

Industrial Products 

Federal Signal Corporation 

2645 Federal Signal Drive 

University Park, IL 60466-3195 

708-534-3400 

SECTION IV 

SERVICE 

4-1 

NOTE: 

The CommCenter accepts messages stored on 

ICs and pluggable circuit boards. Both are referred 

to as message chips in this manual. 

The messages stored on pluggable circuit 

boards will operate on all Series B, Series C, 

and Series D Models. 

The Series D CommCenters use a different 

storage IC than the Series A, Series B, and 

Series C. These ICs cannot be interchanged between 

Series A, Series, B, and Series C models. 


you have before ordering any additional messages. 

4-2. REPLACEMENT PARTS. 

Description Part Number 

Mother Board 200D1148 

Fuse F1 250V,1/2 AMP GMC-1/2A 148A155 

Fuse F2 250V, 1 AMP GMC-1A 148A155-01 

TB1, 17 Position Terminal Block 140A332-17 

TB2, 10 Position Terminal Block 140A332-10

290A2921B 

NOTES: 

1. P.C. BOARD ASSEMBLY 200D1148. 

2. ALL RESISTORS ARE IN OHMS, 1/4W, 5% UNLESS OTHERWISE 

SPECIFIED. 

3. ALL CAPACITORS ARE IN MICROFARADS UNLESS OTHERWISE 

SPECIFIED. 

24K SMT 

200K 

CR6 

LED GRN 

1 

2 

R14 

2.2K,1/2 

1 

2 

24VA 

5V 

SMT 

2 

R102 

1 

18k 

SMT 

1 

2 

R106 

SMT 

18k 

1 

2 

SMT 

R108 

18k 

2 7 

6 

1 8 

2 

MC14532B 

D0 

D1 

IC10 

Q0 

VSS 

Q1 

Q2 

1 

10 

11 

9 

SMT 

R105 

18k 

TRANSF 

RLY DPDT 

CON3 

COM 

ULN2803A 

1N4006 

1 

2 

1 

1 2 

2 

0.1UF 

C12 

8 

ENOUT 

11 

CSCDEN 

R58 

2.2K,1/2 

CSDSIG 

10VRMS 

AUDCMN 

MICOUT 

13 

12 

17 

16 

15 

14 

DIF+ 

DIF- 

CON17 

5V 

1 

2 

PT1 

1 

2 

MICOUT 

DIF+ 

CSDSG 

10VRMS 

DIF- 

PT2 

PTTNO 

PTTCN 

PTTNC 

3 

TB1 

2 

1 

8 

7 

6 

5 

10 

9 

4 

PT4 

PT6 

PT5 

GND 

PT1 

PT2 

PT3 

PTT 

AUDIO 

24V 

GND 

PMNO 

PMCOM 

PTT 

12 

8 

9 

10 

11 

TB3 

13 

14 

15 

5V 

CON15 

PMCOM 

PMNC 

5V 

MICOUT 

I8 

GND 

9 

R90 

18k 

SMT 

PWRDN 

SMT 

2 

1 

7 

4 

5 

6 

3 

1 

PT6 

PT5 

PT2 

PT1 

PT3 

PT4 

2 

1 

R94 

18k 

2 

SMT 

1 

1 

IC1 

I2 

I1 

3 

2 

1 

I4 

I5 

I6 

I7 

7 

6 

4 

5 

I3 

2 

18k 

SMT 

1 

R91 

2 

18k 

R95 

SMT 

R92 

2 

SMT 

18k 

1 

2 

18k 

R96 

2.2K,1/2 

1 

2 

1 

CR1 

5.1V 

2 

2 

R2 

1N4006 

1 

+ 

FUSE 

ACPIN 

ACCIN 

24VA 

9 

10 

CON10 

PWRDN 

24VIN 

TB2 

1 

2 

3 

4 

5 

6 

7 

CSDEN 

CSDIN 

GND 

PMNC 

PMNO 

PMCN 

CSCDIN 

8 

2 

1 

F2 

PMCOM 

CR12 

K1 

SW DPDT 

F1 

FUSE 

JU2 

1 

2 

JUMPER 

1 

2 

2 

1 

2 

1 

JU1 

CON2 

240V 3 

4 

5 

J2 

CON2 

SW1 

120V 

T1 

2 

R16 

C9 

PRIOR 5 

CON3 

200K 

PRIOR 4 

CON3 

CON3 

PRIOR 3 

PRIOR 2 

PRIOR 1 

CON3 

11 

2.2K,1/2 

0.1UF 

C11 

2 1 

1 

3 

2 

4 

C15 

C16 

0.1UF 

0.1UF 

ILD-1 

IC4 

8 

6 

7 

5 

24VA 

R15 

O8 

10 

CR8 

CR9 

1N4006 

1N4006 

CR10 

2 

8 

R101 

18k 

2 

7 

1 

J9 

2 

3 

1 

R21 

1 

J10 

CON3 

2 

3 

13 

14 

12 

10 

11 

9 

5V 

2 

3 

5 

4 

6 

1 

IC5 

4584 

2 

C17 

0.1UF 

R20 

200K 

1 

2 

1 

J11 

2 

3 

1 

C6 

1 

PT3 

O2 

O1 

16 

17 

18 

O7 

O6 

O5 

O4 

12 

13 

15 

14 

O3 

2 

CR7 

10K 

R1 

1N4006 

2.2K,1/2 

2 

C7 

0.1UF 

C8 

0.1UF 

1 

1 2 

5V 

C1 

0.1UF 

0.1UF 

CR13 

R11 

1N4006 

2 

1 

24VA 

1 

2 

1 

2 

PT4 

J1 

3 

1 

2 

C2 

2.2UF 

1N4006 

PT5 

3 

2.2K,1/2 

0.1UF 

C5 

R10 

1 

2 

2 1 

1 

4 

0.1UF 

C10 

0.1UF 

24VA 

3 

4 

1 

2 

3 

14 

13 

11 

12 

9 

10 

8 

4 

6 

5 

7 

1 

2 

IC2 

1 

2 

3 

5V 

4584 


R22 

200K 

1 

2 1 

200K 

R18 

2 

6 

IC25 

5 

ILD-1 

5 

6 

8 

7 

2 

1 

J4 

1 

2 

3 

NC 

NO 

NO 

NC 

5V 

3 

2 

1 

5 

4 

MC14068B 

IC11 

NC 

NO 

C29 

2.2UF 

I4 

I3 

I2 

I1 

GND 

NC 

NC 

+ 

1 

2 

5 

6 

3 

4 

2 

7 

14 

12 

13 

10 

9 

11 

8 

I6 

OUT 

I7 

I8 

NC 

I5 

VDD 

200K 

R31 

1 

1 2 

MOM 

1 

CON3 

5V 

EOUT 

VDD 

D5 

D4 

D2 

D3 

GS 

EIN 

D7 

D6 

14 

15 

16 

12 

13 

3 

2 

1 

R27 

10K 

RPT 

CON3 

J14 

CON3 

J12 

2 

3 

5V 

3 

1 

RPT 

RPT 

MOM 

IC6 

NC 

0.1UF 

C24 

J5 

5V 

6 

Q1 

S1 

R1 

7 

12 

Q3 

R2 

S3 

R3 

GND 

IC8 

EN 

MC14043B 

15 

14 

11 

5 

S2 Q2 

+ 

C18 

10UF 

1 

2 

2 

MC14043B 

Q0 

S0 

R0 

16 

5V 

3 

4 

200K 

1 

R17 

2 

NO 

1 

2 

200K 

NO 

NC 

R0 

5VR19 

2 

1 

Q1 

Q2 

S1 

R1 

S2 

Q3 

S3 

R3 

R2 

11 

12 

7 

5 

14 

15 

6 

EN GND 

5V 

Q0 

S0 

16 

5V 

3 

4 

CON3 

CON3 

J13 

9 

10 

1 

8 

2 

1 

2 

2 

J8 

1 

3 

1 

MOM 

2 

4 

NL27WZ00 

MOM 

RPT 

1 

SMT 

2 

8 

C107 

0.1µF, 50V 

CON3 

10 

8 

1 

9 

J7 

1 

3 

2 

2 

J6 

1 

2 

3 

MOM 

RPT 

5V 

2 

R120 

SMT 

200K 

R119 

1 

MOM 

RPT 

CON3 

PRIOR 6 

1 

2 

PT6 

1 

2 

PMNO 

CR11 

10K 

R3 

2 

24V 


PMNC 

0.1UF 

R12 

24VA 

2.2K 

2 

1 

2 

R13 

2.2K 

C13 

0.1UF 

2 

1 

1 2 

C14 

STD OUT 

1 JU3 

JUMPER 

CWS IN 

1 

5V 

2 

8 

24VA 

1 

1000UF 

- 

1 

+ 

C4 

2 

+ 

5V 

IC24 

7 

8 

ILD-1 

R66 

18k 

SMT 

R67 

18k 

SMT 

1 

2 

J3 

1 

3 

2 

1 

2 

2 

R68 

18k 

SMT 

1 

R69 

18k 

SMT 

1 

+ 

2 

2 

C76 

330UF 

CR5 

1N5253B 

FWB 

11 

CR2 

1 

R52 

220,1/2W 

Q3 

2N5296 

24V 

PRIORITY TONE 6 

APR9600 

1µF, 50V 

NL27WZ00 

11 

BUSY 

0.1µF, 50V 

SMT 

NL27WZ00 

NO 

NC 

1 

SMT 

200K 

2 

5V 

5 

7 

2 

4 

1 

2 

C98 

SMT 

U1A 

5V 

C91 

1 

8 

1 

12 

13 

BE 

VSSD 

14 

VSSA 

SP+ 

6 

OUT 

5V 

2 

1 R112 

1 

1 

C78 

100UF 

2 

+ 

/ON 

5 

GND 

+VIN 

3 

5V 

R110 

24K SMT 

1 

2 

3 

M1 

M2 

4 

5 

6 

7 

8 

M4 

M5 

M6 

OscR 

9 

10 

M8 

M7 

M3 

CR4 

MR813 

2 1 

L1 

1.5MH 

18 

AGC 

220K 

SMT 

R116 

R114 

1µF, 50V 

18k 

SMT 

C99 

SMT 

1 

2 

16 

17 

SMT 

15 

MIC 

MIC REF 

SP- 

VCCA 

U1B 

3 

1 

2 

0.1µF, 50V 

1 

C92 

2 

1 

+ 

22µF, 25V 

C96 

SMT 

1 

2 

4.7µF, 16V 

1+ 

C95 

SMT 

2 

2 

C86 

0.005UF 

0.1µF, 50V 

27 

28 

26 

21 

22 

23 

24 

25 

19 

20 

IC22 

/RE 

VCCD 

CE 

STROBE 

Msel-2 

Msel-1 

ANA IN 

ANA OUT 

ExtClk 

C88 

1 

SMT 

1 

5v 

2 

1 

C73 

2 

+ 

470UF 

1 

2 

C79 

2 

2 

0.1µF, 50V SMT 

5v 

1 

R109 

2 

18k 

SMT 

VCCA 

1 

+ 

2 

C39 

22UF 

FEED 

IC20 

LM2575-5 

4 

5V 

OUT 

7 

8 

VSS 

MC14051B 

VEE 

2 

C45 

1 

1.0UF 

2 

1 

X6 

IC13 

X4 

4 

3 

X7 

XOUT 

5 

6 

INH 

X5 

10 

9 

C 

B 

15 

16 

X2 

VDD 

13 

14 

X0 

X1 

A 

11 

12 

X3 

2 

1 

2 

C46 

2 

18k 

SMT 

R107 1.0UF 

R104 

18k 

SMT 

COMPIN 

1 

2 

1 

R103 

18k 

SMT 

VCCA 

2 

1 

CSCDIN 

C54 

330UF 

1 

2 


APR9600 

NL27WZ00 

C118 

0.1µF, 50V 

C120 

R133 

SMT 

220K 

R135 

R100 

C124 

NL27WZ00 

0.1µF, 50V 

100K 

ENOUT 

Q2 

2 

TIS92 

2 

+ 

22 

1 

C30 

2 

24V 

1 

R26 

Q1 

TIS92 

CR3 

1N4006 

1 

2 

0.1µF, 50V 

0.1UF 

NL27WZ00 

SMT 

C130 

2 

1µF, 50V 

U5A 

5V 

1 

8 

4 

2 

1 

2 

SMT 

6 

5 

7 

1 

1 

C48 

2 

1 

SMT 

18k 

2 

C131 

1µF, 50V 

U5B 

3 1 

SMT 

18k 

C125 

1 

2 1 

APR9600 


M3 

2 

24K SMT 

R131 

200K 

SMT 

4 

M5 

M6 

M7 

9 

6 

7 

8 

5 

M4 

BE 

11 

13 

12 

10 

SP+ 

14 

M8 

OscR 

BUSY 


VSSA 

5V 

R128 

M1 

M2 

1 

3 

2 

ExtClk 

25 

20 

23 

22 

21 

24 

16 

17 

18 

19 

15 

CE 

ANA OUT 

STROBE 

Msel-2 

Msel-1 

AGC 

MIC 

SP- 

MIC REF 

VCCA 

ANA IN 

SMT 

1 

1 

SMT 

26 

27 

28 

5v 

/RE 

VCCD 

IC16 

1 

SMT 

C105 

C112 

SMT 

22µF, 25V 

4.7µF, 16V 


19 

10 

AGC 

SP- 

VCCA 

MIC 

MIC REF 

U3A 

NL27WZ00 

1µF, 50V 

7 

C113 

1 

SMT 

2 

5 

BUSY 

BE 


VSSA 

SP+ 

12 

11 

14 

13 

5V 

APR9600 

6 

2 

1 

3 

1µF, 50V 

C114 

1 

2 

+1 

18k 

SMT 

2 

1 

2 

0.1µF, 50V 

17 

18 

15 

16 

U3B 

C108 

SMT 

+1 

2 

1 

2 

R124 

220K 

SMT 

R126 

/RE 

VCCD 

IC17 

Msel-2 

CE 

Msel-1 

ExtClk 

ANA IN 

ANA OUT 

STROBE 

M1 

M2 

M3 

M4 

M5 

M6 

OscR 

M7 

M8 


1 

2 

7 

6 

5 

4 

3 

8 

9 

5v 

0.1µF, 50V 

28 

27 

22 

23 

24 

25 

26 

21 

20 

C103 

1 

SMT 

2 

2 

1 

C104 

M6 

R123 

0.1µF, 50V 

NL27WZ00 

U4A 

8 

SMT 

4 

2 

1 

6 

5 

7 

2 1 

SMT 

1µF, 50V 

C116 

24K SMT 

5V 

1 

C110 

2 

M7 

OscR 

M8 

BE 

BUSY 


SP+ 

VSSA 

8 

7 

11 

13 

12 

10 

9 

14 

R118 

SMT 

18k 

1 

2 

1 

5V 

2 

R121 

5V 

200K 

SMT 

M1 

M2 

M3 

M4 

M5 

2 

3 

1 

6 

5 

4 


C133 

1µF, 50V 

0.1µF, 50V 

VCCA 

22µF, 25V 

2 1 

SMT 

C128 

+ 

2 

2 

SMT 

1 

8 

4 

2 

1 

2 

C126 

SMT 

NL27WZ00 

5V 

U6A 

7 

1 

R130 

4.7µF, 16V 

2 


C122 

+1 

2 

SMT 

SMT 

2 

18k 

5v 

2 

1 

2 

1 

R132 

24K SMT 

SMT 

200K 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

R129 

5V 

1 

2 

3 

2 

0.1µF, 50V 

1 

1µF, 50V 

C132 

2 

6 

5 

NL27WZ00 

C127 

1 

2 

U6B 

3 

1 

C129 

22µF, 25V 

SMT 

1 

2 + 

2 

R136 

SMT 

18k 

ExtClk 

M3 

ANA OUT 

STROBE 

Msel-2 

Msel-1 

VCCA 

MIC REF 

ANA IN 

M5 

M6 

OscR 

M7 

M4 

BUSY 

BE 


VSSA 

SP+ 

M8 

APR9600 

25 

20 

21 

22 

23 

24 

CE 

15 

16 

17 

18 

19 

SMT 

SP- 

MIC 

AGC 

VCCD 

IC7 

5v 

M1 

M2 

27 

28 

26 

/RE 

0.1µF, 50V 


4.7µF, 16V 

SMT 

SMT 

1 2 

C121 

1+ 

2 

R134 

1 

SMT 

220K 

C123 

2 

1 

C119 

5v 

CE 

R125 

C106 

220K 

SMT 

R127 

2 

U4B 

3 

1µF, 50V 

C117 

SMT 

18k 

2 1 

1 

15 

20 

18 

16 

17 

19 

21 

22 

ANA OUT 

STROBE 

MIC REF 

MIC 

AGC 

ANA IN 

SP- 

VCCA 

1 

1 

2 

C111 

SMT 

1 

0.1µF, 50V 

22µF, 25V 

+ 

2 1 

2 

C115 

SMT 

4.7µF, 16V 

+1 

2 

2 

C109 

SMT 


0.1µF, 50V 

C102 

27 

26 

28 

23 

24 

25 

/RE 

ExtClk 

IC9 

VCCD 

Msel-2 

Msel-1 

5v 

1 

SMT 

5v 

2 

18k 

SMT 

R122 

1 

2 

23 

2 

16 

1 

VSS 

8 

X4 

X6 

X7 

XOUT 

2 

3 

4 

X5 

INH 

VEE 

5 

6 

7 

9 

C 

VDD 

13 

14 

X0 

X1 

X2 

15 

11 

12 

A 

X3 

B 

10 

1 

MC14051B 

VCCA 

C84 

0.1UF 

IC19 

1 

2 

2 

1 

CSDSG 

/RE 

VCCD 

CE 

STROBE 

Msel-2 

Msel-1 

AGC 

MIC REF 

ANA IN 

ANA OUT 

SP- 

VCCA 

BUSY 

5V 

NL27WZ00 

2 

4 

200K 

SMT 

5V 

C93 

8 

1 

2 

0.1µF, 50V 

SMT 

1 

1µF, 50V 

C100 

SMT 

7 

1 

2 

5 


VSSA 

SP+ 

NL27WZ00 

BE 

11 

12 

13 

14 

U2A 

MIC 

6 

APR9600 

24K SMT 

R113 

1 

5V 

5V 

2 

R111 

OUT 

1 

2 

1 

10K 

R39 

1 

2 

C71 

0.1 

PROIRITY TONE 3 

OscR 

M1 

1 

M2 

2 

3 

M4 

4 

M5 

5 

M6 

6 

7 

8 

M8 

9 

M7 

10 

M3 

IC12 

ExtClk 

C55 

0.01 

1 

2.2K 

R50 

1 

2 

2 

4.7µF, 16V 

22µF, 25V 

+ 

SMT 

1 

2 

C101 

1µF, 50V 

C97 

SMT 

1 

18k 

2 

1 

2 

17 

18 

0.1µF, 50V 

1 

15 

C94 

SMT 

2 

16 

U2B 

1 

3 

1+ 

2 

SMT 

220K 

R115 

C90 

SMT 

2 

R117 

1 


0.1µF, 50V 

SMT 

1 

5v 

27 

28 

26 

21 

22 

23 

24 

25 

19 

20 

C87 

2 

C89 

2 

1 

SSM2139 

3 

2 

8 

+ 

- 

4 

1 

1 

IC15A 

C52 

1.0UF 

2 

5V 

R65 

18k 

SMT 

R32 

1K 

1 

2 

2 

R40 

10K 

2 

24V COMPIN 

2 

1 

1.0UF 

24V 

C47 

1K 

R59 

1 2 

0.1UF 

R45 

18k 

C51 

1.0UF 

11 

6 

INH 

VEE 

7 

VSS 

8 

MC14051B 

IC18 

B 

10 

A 

C 

9 

X4 

X6 

1 

2 

XOUT 

X7 

X5 

4 

5 

3 

X2 

15 

16 

VDD 

X3 

12 

X0 

13 

X1 

14 

2 

1 

2 

R80 

18k 

SMT 

1 

2 

1 

2 

1 

R70 

18k 

SMT 

VCCA 

VCCA 

C77 

0.1UF 

1 

2 

1.0UF 

2 

1 

2 

2 

SMT 

1 

2 

R62 

18k 

SMT 

SMT 

1 

1 

2 

VCCA 

1 

R60 

18k 

2 

1 

R77 

18k 

SMT 

R78 

18k 

SMT 12 

2 

VCCA 

1 

R71 

18k 

SMT 

VCCA 

18k 

SMT 

R72 

1 2 

1 

R81 

18k 

SMT 

2 

1 

2 

1 

R82 

18k 

SMT 

C53 

2.2UF 

+ 

2 

2 

18k 

R73 

VCCA 

SMT 

2 

R74 

18k 

2 

VCCA 

1 

SMT 

R61 

SMT 

18k 

R63 

18k 

SMT 

1 2 

R49 

2 

680 

2 

VCCA 

1 

18k 

SMT 

R46 

10K 

1 

2 

1 

R47 

330 

VREF 

C38 

1 

1.0UF 

1 

R37 

9 

GND 

10 

GAIN 

10K 

1 

2 1 

IC14 

2 

2 

RIN1 

1 

2 

3 

4 

6 

7 

8 

5 

SA575 

+VIN 

-VIN 

VOUT 

CRT1 

SUM1 

COM1 

R48 

C50 

2 

1 

R44 

1 

1 

2 

2 

10K 

1 

C49 

VCCA 

VCCA 

R35 

10K 

1 

X5 

5 

INH 

VEE 

VSS 

7 

8 

6 

12 

X3 

9 

10 

C 

B 

A 

11 

VCCA 

IC23 

MC14051B 

R99 

18k 

SMT 

23 

1 

X6 

XOUT 

2 

3 

X7 

4 

X4 

16 

14 

15 

13 

X1 

X2 

X0 

VDD 

2 

C85 

0.1UF 

1 

2 

1 

R97 

18k 

SMT 

1 

2 

18k 

R89 

SMT 

1 

VCCA 

R93 

18k 

SMT 

VCCA 

1 

2 

18k 

R87 

SMT 

18k 

SMT 

R88 

SMT 

18k 

2 

VCCA 

R84 

10VRMS 

2 

1 

2 

1 

R5 

1 

10K 

2 

R28 

120,2W 

MICOUT 

R4 

100 

RLY DPDT 

DIF+ 

DIF- 

MUTE 

TDA2616 

Insert 

R36 

2 

1 

C69 

STD IN 

CWS CUT 

1 

2 

18k 

R79 

SMT 

1 

R83 

18k 

SMT 

R7 

VCCA 

2 

18k 

R75 

SMT 

VCCA 

R76 

18k 

22UF 

2.2K 

SMT 

K2 

0 

1 2 

C3 

0.1UF 

1 

1 

2 

1 

2 

C74 

22UF 

2 

1 

2 

COM2 

12 

11 

GAIN 

SUM2 

R6 

50K 

2 

2 

1 

2 

R8 

2.2K 

17 

18 

19 

20 

2 

VOUT 

-VIN 

+VIN 

VCC 

13 

14 

15 

SUM2 

CRT2 

RIN2 

16 

R33 

27K 

1 

2 

1 

C37 

1.0UF 

2 

1 

2 

C75 

1 

22UF 

C72 

2 

1 

2 

R51 

8.2 

0.01 

2 

R9 

10K 

1 

2 

1 

+ C68 

100UF 

2 

1 

C70 

22UF 

3 

4 

5 

6 

7 

8 

9 

1 

C80 

0.005UF 

C83 

0.1UF 

C32 

1000UF 

1 

2 

+ 

24V 

GND 

OUT1 

-Vcc 

OUT2 

INV2 

-IN2 

+Vcc 

IC21 

0.01 

1 

R34 

10K 

1 

C31 

22UF 

2 

+ 

C82 

0.1 

1 

1 

2 

1 

2 

C81 

2 

-IN1 

4-2 

Figure 4-1. Model 300MB Series D Schematic Diagram.

MODEL 300MB-SD - Federal Signal

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