Federal Signal Corporation CommCenter D1 Series Quick guide

256A1078H
REV H 1009
Printed in U.S.A.
INSTALLATION AND SERVICE INSTRUCTIONS
MODEL 300MB-SD
CommCenter
Series D1

Warranty – Seller warrants all goods for five years on parts and 2-1/2 years on labor, under the follow-
ing 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 workman-
ship. 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 war-
ranteed 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 de-
fects 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: [phone] • Fax: [phone]
[email protected] • www.federalsignal-indust.com

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
TABLE OF CONTENTS

SECTION I
GENERAL DESCRIPTION
The CommCenter can be used for a variety of prior-
itized signaling purposes, such as indicating the status
of a machine or process, background messages, evacu-
ation, alarm, start and dismissal, and other audible
notification applications. The system can be automated
if external (customer-supplied) devices such as program-
mable 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/ampli-
fier 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, powder-
coated 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 stor-
age 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).
1-1
1-1. GENERAL.
The CommCenter, Model 300MB Series D, is a digi-
tal 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 stor-
age 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).
2.27
1.06
1.08
2.86
3.57
1.18 9.75
6.87
2.15
11.57
1.28
2.20
6.77
9.41
3
41
2
FIELD WIRING BLOCK FOR 120/240V POWER
CONNECTION
KNOCKOUT PROVISION 0.87 DIA., 5 PLACES
COVER REMOVED
TO SHOW FOUR
MOUNTING HOLES
0.20 DIA., FOR
#10 SCREWS
290A2664-18
Figure 1-1. Mounting Holes and Dimensions.

1-2
Figure 1-2. Model 300MB Series D Mother Board.
290A2922B
C49
R46
R45
C84
C85
IC4
R101
TONE 2
R123
R132
PRIORITY
PRIORITY
TONE 3
R131
PRIORITY
PRIORITY
PRIORITY
TONE 6
R120
R110
C97
IC12
IC16
IC17
++
C96 C112
++
C128
R126
R116
C92
R117
R135
C125
TONE 4
TONE 5
C108
IC7
IC9
+
C115
+
C13
C129 R69
R68
IC25
IC25
R136
R127
C94
C111
IC24
IC24
PRIORITY
TONE 1
C127
R67
R66
C14
R12
R13
C15
R1
C7
C9
C5
CR7
CR11
STD
TB1
J1
R10
C6
C10
R11
C8
C11
ALT
1
IC13
R61
C122
C100
R76
C99
C95
C105
R63
C118
IC22
C93
IC22
IC16
C91
IC17
R114
C107
C124
C88
R112
U1
R113
C120
R128
C104
R119
R124
U3
R133
U5
C86
+
R109
C113
C98
R118
C131
R130
+
C103
C130
+
C114
R80
R82
IC23
R83
R79
R58
R88R75
R84
IC19
R62
R60
R74
R100R78
R70
R72
R103
R87
CR6
R89
R97
R93
R59
R77R81
C45
R107
R104
R73
IC18
C47
R71
R99
R121
C123
C90
C101
R65
C119
C16
R14
R15
IC9
IC12
C126
IC7
C110
C106
R125
R115
R111
R122
U2
C89
U4
C121
R134
R129
R102
U6
IC5
C133
C109
C117
C87
C116
+
C102
+
C17
C132
+
R94
1
IC1
CR10
CR13
R91
C12 R90 TB3
R95
CR1
R96
C2
R92
R
NO
R
IC11
C24
R105
R106
R108
C46
IC10
IC6
R21
R19
J12
TONE1
R
NO J9
M
NC
R
J6
M
1
IC8
R32
C48
C37
R33
R35
R34
R31
J11
J13
NC
TONE2
J14
J10
M R
NO
J7
R20
M R
NC
TONE3
M
+
J8
M
NO
C1
R16
CR8
R2
CR9
TONE6
NO
J3
NC
R3
NC
TONE5
J4
NO NC
TONE4
J5
IC2
R17 R18
R4
R5
R50
R52
C53
C78
C77
+
R44
L1 R47
C73
C68
CR4
IC20
C79
C50
C51
C80
+
IC21
R9
C83
C54
R49
C82
C74
C69
C81
C75
C70
Q3
CR5 C76
R51
C72
C71
C4
C31
CR3
R26
R36
IC14
C29
R22
C18
T1
C38
K2
C52
R37
R7
C3
R6
L
O
V
V
I
R8
1
CR12
K1
CR2
R27
R40
R39
C39
R48
Q1
Q2
IC15
C30
C55
R28
C32
GMC-1A
F2
SW1
JU3
J2
TB2
B W
JU2
JU1
GMC-1/2A
F1
200D1148 G 250V
240V 120V
250V

SECTION II
SPECIFICATIONS
2-1. POWER INPUT.
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 (<3% THD)
Unbalanced Sig. Line ............................................................. 9 Vrms
Balanced Sig. Line.................................................................. 17 Vrms
Low Level Sig. Out ................................................................. 1 V p-p
C. Output Voltage Levels Max Load (<3% THD)
Unbalanced Sig. Line ............................................................. 8 Vrms (25 ohm load)
Balanced Sig. Line.................................................................. 15 Vrms (40 ohm load)
Low Level Sig. Line ................................................................ 1 V p-p (600 ohm load)
D. Tone Output Levels No Load (sq. wave)
Unbalanced Sig. Line ............................................................. 12 Vrms
Balanced Sig. Line.................................................................. 25 Vrms
Low Level Sig. Line ................................................................ 1 V p-p
E. Tone Output Levels Max Load (sq. wave)
Unbalanced Sig. Line ............................................................. 12 Vrms (25 ohm load)
Balanced Sig. Line.................................................................. 20 Vrms (40 ohm load)
Low Level Sig. Line ................................................................ 0.56 Vrms (600 ohm load)
F. Audio Frequency Response Balanced Sig. Line
40 ohms max load, From 250 Hz to 80 kHz
(Reference 1 kHz) ................................................................... -3 dB
40 ohm max load, From 450 Hz to 60 kHz
(Reference 1 kHz) ................................................................... -1 dB
No load, From 100 Hz to 90 kHz
(Reference 1 kHz) ................................................................... -3 dB
No load, From 200 Hz to 60 kHz
(Reference 1 kHz) ................................................................... -1 dB
G. Signal To Noise Ratio (<3% THD)
Chip Input............................................................................... 67 dB A
H. Audio Distortion From Cascade Input to Balanced Sig.
Line Output (40 ohm load)..................................................... 0.2%
2-1

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

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 clos-
ing 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 mes-
sage before stopping.
Each of the six inputs can be individually con-
figured 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 silk-
screen.
3-4. CONTROL CIRCUITRY.
A. The control circuitry in the CommCenter
has a built-in priority level feature. If a given mes-
sage 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 Prior-
ity Tone 6. The cascade input has the lowest level of
priority.
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 accom-
plished 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 wear-
ing hearing protection.
• Alleffectivewarningspeakersproduceloudsounds,
which may cause, in certain situations, permanent hear-
ing 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

MESSAGE Jumper Marking Jumper Marking
PRIORITY J9 NO NC J12 R M
TONE1
PRIORITY J10 NO NC J14 R M
TONE 2
PRIORITY J11 NO NC J13 R M
TONE 3
PRIORITY J5 NO NC J8 R M
TONE 4
PRIORITY J4 NO NC J7 R M
TONE 5
PRIORITY J3 NO NC J6 R M
TONE 6
Notes: 1. NO NC configures an individual chan-
nel 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 mes-
sage (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 mainte-
nance 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.
Failure to follow all safety precautions and
instructions may result in property damage
serious injury, or death to you or others.
Do not perform any installation or mainte-
nance on this system when power is on.
This device is to be installed by a trained elec-
trician 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 in-
put 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 imped-
ance 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
3-2

Figure 3-1. Model 300MB Rear View.
enable and signal in terminals. The SIG COM termi-
nals (TB1-16) of both uinits also need to be connected
together as shown in figure 3-2.
3-7. SIGNAL LINES.
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 recom-
mend 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.
3. Extended downtime because of the
second party involvement required to
service the lines.
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 sys-
tem 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) ter-
minals 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 con-
nections. 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
3-3
NOT USED NOT USED + 24VDC - 24VDC POWER DOWN NO NC COM ENABLE SIGNAL MIC OUT SIG COM SIG HI SIG SIG SIGNAL ENABLE COM NC NO COM MESSAGE 1 MESSAGE 2 MESSAGE 3 MESSAGE 4 MESSAGE 5 MESSAGE 6
290A2923
PTT RELAY
CASCADE IN CASCADE OUT
POWER MONITOR RELAY
25 VRMS LINE
GND
120/240 VAC
CLASS II FIELD WIRING
COMPARTMENT
CLASS I FIELD WIRING
COMPARTMENT
KNOCK-OUTS IN REAR OF HOUSING
MODEL 300MB REAR VIEW
(BACK OF HOUSING IS REMOVED FOR CLARITY)
OUTPUT LEVEL
TB2 TB1
10 987654321 17 16 15 14 13 12 11 10 987654321

3-4
GROUND
MASTER
SLAVE
SIGNAL
ENABLE
CASCADE
OUT
120/240 VAC
GROUND
290A2718
10 21 17 16 15 1
10 16 12 11 11
TB-2 TB-1
TB-2
GAIN
CNTR
GAIN
CNTR
TB-1
YEL
120 VAC 120 VAC
BLU
LOCAL PWR. LOCAL PWR.
POWER LINES
MODEL
300GC
MODEL 300MB
MODEL 300MB
SIG. HI (YEL)
COM. (BLU)
MODEL
300CK
SIGNAL LINES SHIELDED
TWISTED PAIR
SIGNAL
ENABLE
CASCADE IN
120/240 VAC
Figure 3-2. Cascading Multiple Units.
B. 25 Vrms Signal Line Application.
The CommCenter has provision for con-
necting 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 termi-
nal 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 trans-
mitted 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
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.
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.
Figure 3-3. 300CK Connections.
300GC
TERMINAL BLOCK (TB1)
ON REAR OF 300MB
YEL BLU YEL BLU
300CK
300GC
300CK
COM SIG
HI
16 15
SHIELDED
TWISTED PAIR
SIGNAL LINE
TO ADDITIONAL
SELECTONES
290A2664-17

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 pri-
mary 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 ter-
minal TB2-7 of the TB2 terminal block located in the
back of the 300MB (see figure 3-4).
3-11. TYPICAL INSTALLATIONS.
A. SelecTone Installation (see figure 3-5).
In this installation, the CommCenter is act-
ing 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 ad-
justed such that the audio output is at the required
3-5
Figure 3-4. Typical Central Power System.
Figure 3-5. Typical Selectone Installation.
GROUND
290A2664-24C
10 87 11716151
TB-2 TB-1
GAIN
CNTR
YEL
BLU
POWER
LINES
MODEL 300GC
24 VDC
MODEL 300MB
MODEL 300CK
SIGNAL LINES SHIELDED
TWISTED PAIR
120/240 VAC NOT USED WITH MODEL PS300
24 VDC
POWER
SUPPLY
CKT. 1
CKT. 2
+
+
-
-
GROUND
290A2664-19B
10 11716151
TB-2 TB-1
GAIN
CNTR
YEL
BLU
MODEL 300GC
MODEL 300MB
MODEL 300CK
SIGNAL LINES SHIELDED
TWISTED PAIR
120/240 VAC
120 VAC 120 VAC
LOCAL PWR. LOCAL PWR.
POWER LINES
SIG. HI (YEL)
COM. (BLU)

Figure 3-7. Model 300MB with 25VRMS Connections.
3-6
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
Table 3-2. 300MC Connections to 300VSC-1, 300SCW-1, or 300SSC.
GROUND
290A2664-20B
10 11716108 1
TB-2 TB-1
GAIN
CNTR
12 1712 13 1417 16
TB-1 TB-2
YEL
BLU
MODEL 300GC
MODEL 300VCS-1
120 VAC
MODEL 300MB
MODEL 300CK
SIGNAL LINES SHIELDED
TWISTED PAIR
120/240 VAC
120 VAC 120 VAC
LOCAL PWR. LOCAL PWR.
POWER
LINES
SIG. HI (YEL)
COM. (BLU)
GROUND
290A2664-21B
10 11714131
TB-2 TB-1
GAIN
CNTR
MODEL 300MB
SIGNAL LINES
SHIELDED
TWISTED PAIR
120/240 VAC
TB1-13
TB1-14
SIGNAL -
SIGNAL +
TO ADDITIONAL SPEAKERS, 40 OHMS MAXIMUM LOAD

Figure 3-8. Model 300MB with Central Amplifier Connections.
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 di-
rectly driving a speaker or speakers, the total power
consumed not exceeding the drive capability of a
CommCenter.
D. 300MB Interfacing with a Central Ampli-
fied System (see figure 3-8).
In this installation the CommCenter is
acting as an audio input to a Central Amplifier. Mes-
sage 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 be-
tween Series A, Series, B, and Series C models.
Make sure to specify which series CommCen-
ter 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
chip is marked with the Model Number and other
information.
Failure to follow all safety precautions and
instructions may result in property damage
serious injury, or death to you or others.
Do not perform any installation or mainte-
nance on this system when power is on.
This device is to be installed by a trained elec-
trician who is thoroughly familiar with the
National Electrical Code and will follow the
NEC guidelines as well as local codes.
NOTE
The Storage Chips and the CommCenter’s
circuitry can be destroyed or damaged by
static discharge. Observe anti-static proce-
dures when installing or servicing a
CommCenter.
Storage Chips should be installed starting at
Priority Tone 1 and working downward. If, for ex-
ample, 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 in-
serted in the socket—not bent under.
Test the CommCenter after any maintenance
is performed.
3-7
GROUND
290A2664-22B
10 117161
TB-2 TB-1
GAIN
CNTR
MODEL 300MB
CENTRAL AMPLIFIER
SIGNAL LINES
SHIELDED
TWISTED PAIR
120/240 VAC
TB1-16
TB1-17
SIGNAL COMMON
MIC. OUT
TO ADDITIONAL SPEAKERS, 40 OHMS MAXIMUM LOAD
AUDIO INPUT

SECTION IV
SERVICE
4-1. GENERAL.
NOTE:
The CommCenter accepts messages stored on
ICs and pluggable circuit boards. Both are re-
ferred 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 be-
tween Series A, Series, B, and Series C models.
Make sure to specify which series CommCenter
you have before ordering any additional mes-
sages.
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
4-1
The Federal Signal factory will service your
equipment or provide assistance with technical prob-
lems that cannot be handled satisfactorily locally.
Any units returned to Federal Signal for ser-
vice, 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 malfunc-
tion 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

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
12
R14
2.2K,1/2
12
24VA
5V
SMT
2
R102
1
18k
SMT
1
2
R106
SMT
18k
12
SMT
R108
18k
2
7
6
1
8
2
MC14532B
D0
D1
IC10
Q0VSS
Q1
Q2
1
10
11
9
SMT
R105
18k
TRANSF
RLY DPDT
CON3
COM
ULN2803A
1N4006
1211 22
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
12
PT1
12
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
21
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
21
F2
PMCOM
CR12
K1
SW DPDT
F1
FUSE
JU2
1
2
JUMPER
1
2
21
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
12
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
11 2
5V
C1
0.1UF
0.1UF
CR13
R11
1N4006
2
1
24VA
1212
PT4
J1
3
1
2
C2
2.2UF
1N4006
PT5
3
2.2K,1/2
0.1UF
C5
R10
122 11
4
0.1UF
C10
0.1UF
24VA
3
4
1
2
3
14
13
11
12
9
10
8
4
6
5
7
12
IC2
1
2
3
5V
4584
CSDEN
R22
200K
12 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
200KR31
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
6Q1S1
R1
7
12
Q3
R2
S3
R3
GND
IC8
EN
MC14043B
15
14
11
5
S2 Q2
+
C18
10UF
12
2
MC14043B
Q0S0
R0
16
5V
3
4
200K
1
R17
2
NO 1
2
200K
NO
NC
R0
5V
R19
2
1
Q1
Q2
S1
R1
S2
Q3S3
R3
R2
11
12
7
5
14
15
6
EN GND
5V
Q0S0
16
5V
3
4
CON3
CON3
J13
9
10
1
8
2
1
2
2
J8
1
31
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
12
PT6
12
PMNO
CR11
10K
R3
2
24V
CSDEN
PMNC
0.1UF
R12
24VA
2.2K
2
1
2
R13
2.2K
C13
0.1UF
211 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
12
J3
1
3
2
12
2
R68
18k
SMT
1
R69
18k
SMT
1
+
22
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
57
2
4
12
C98
SMT
U1A
5V
C91
1
8
1
12
13
BE
VSSD
14 VSSA
SP+
6
OUT
5V 21 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
12
16
17
SMT
15
MIC
MIC REF
SP-
VCCA
U1B
3
12
0.1µF, 50V
1
C92
2
1
+
22µF, 25V
C96
SMT
12
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
12
C79
2
2
0.1µF, 50V SMT
5v
1
R109
2
18k
SMT
VCCA
1
+
2
C39
22UF
FEED
IC20
LM2575-5
45V
OUT
7
8VSS
MC14051B
VEE
2
C45
1
1.0UF
2
1
X6
IC13
X4
4
3
X7
XOUT
5
6INH
X5
10
9
C
B
15
16
X2
VDD
13
14
X0
X1
A11
12
X3
2
12
C46
2
18k
SMT
R107 1.0UF
R104
18k
SMT
COMPIN
12
1
R103
18k
SMT
VCCA
21 CSCDIN
C54
330UF
12
PRIORITY TONE 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
84
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
PRIORITY TONE 4
M3
2
24K SMT
R131
200K
SMT
4
M5
M6
M7
9
6
7
8
5M4
BE
11
13
12
10
SP+
14
M8
OscR
BUSY
VSSD
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
0.1µF, 50V SMT
1910 AGC
SP-
VCCA
MIC
MIC REF
U3A
NL27WZ00
1µF, 50V
7
C113
1
SMT
2
5
BUSY
BE
VSSD
VSSA
SP+
12
11
14
13
5V
APR9600
6
213
1µF, 50V
C114
12
+
1
18k
SMT
2
12
0.1µF, 50V
17
18
15
16
U3B
C108
SMT
+
12
12
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
PRIORITY TONE 5
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
21
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
VSSD
SP+
VSSA
8
7
11
13
12
10
9
14
R118
SMT
18k
12
1
5V
2
R121
5V
200K
SMT
M1
M2
M3
M4
M5
2
3
1
6
5
4
PRIORITY TONE 1
C133
1µF, 50V
0.1µF, 50V
VCCA
22µF, 25V
2 1
SMT
C128
+
2
2
SMT
1
84
2
1
2
C126
SMT
NL27WZ00
5V
U6A
7
1
R130
4.7µF, 16V
2
0.1µF, 50V SMT
C122
+
12
SMT
SMT
2
18k
5v
2
1
21
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
12
U6B
3
1
C129
22µF, 25V
SMT
12
+
2
R136
SMT
18k
ExtClkM3
ANA OUT
STROBE
Msel-2
Msel-1
VCCA
MIC REF
ANA IN
M5
M6
OscR
M7
M4
BUSY
BE
VSSD
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
0.1µF, 50V SMT
4.7µF, 16V
SMT
SMT
1 2
C121
1
+
2
R134
1
SMT
220K
C123
21
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
12
C111
SMT
1
0.1µF, 50V
22µF, 25V
+
2 1
2
C115
SMT
4.7µF, 16V
+
1
2
2
C109
SMT
0.1µF, 50V SMT
0.1µF, 50V
C102
27
26
28
23
24
25
/RE
ExtClk
IC9
VCCD
Msel-2
Msel-1
5v
1
SMT
5v
218k
SMT
R122
12
23
2
161
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
B10
1
MC14051B
VCCA
C84
0.1UF
IC19
12
21
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
12
0.1µF, 50V
SMT
1
1µF, 50V
C100
SMT
7
12
5
VSSD
VSSA
SP+
NL27WZ00
BE
11
12
13
14
U2A
MIC
6
APR9600
24K SMT
R113
1
5V
5V
2
R111
OUT
121
10K
R39
12
C71
0.1
PROIRITY TONE 3
OscR
M1
1
M2
2
3
M4
4
M5
5
M6
6
7
8
M8
9M7
10
M3
IC12
ExtClk
C55
0.01
1
2.2K
R50
12
2
4.7µF, 16V
22µF, 25V
+
SMT
12
C101
1µF, 50V
C97
SMT
1
18k
2
12
17
18
0.1µF, 50V
1
15
C94
SMT
2
16
U2B
13
1
+
2
SMT
220K
R115 C90
SMT
2
R117
1
0.1µF, 50V SMT
0.1µF, 50V
SMT
1
5v
27
28
26
21
22
23
24
25
19
20
C87
2
C89
21
SSM2139
3
2
8
+
-
4
11
IC15A
C52
1.0UF
2
5V
R65
18k
SMT
R32
1K
1
2
2
R40
10K
2
24V COMPIN 21
1.0UF
24V
C47
1K
R59
1 2
0.1UF
R4518k
C51
1.0UF
116 INH
VEE
7
VSS
8
MC14051B
IC18
B10
A
C9
X4
X6
1
2
XOUT
X7
X5
4
5
3
X2 15
16
VDD
X3 12
X0 13
X1 14
21
2
R80
18k
SMT
1
21
21
R70
18k
SMT
VCCA
VCCA
C77
0.1UF
12
1.0UF
212
2
SMT
12
R62
18k
SMT
SMT
1
12
VCCA
1
R60
18k
21
R77
18k
SMT
R78
18k
SMT
1 2
2
VCCA
1
R71
18k
SMT
VCCA
18k
SMT
R72
1 2
1
R81
18k
SMT
21
21
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
121
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
21 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
A11
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
21
R97
18k
SMT
12
18k
R89
SMT
1
VCCA
R93
18k
SMT
VCCA
12
18k
R87
SMT
18k
SMT
R88
SMT
18k
2
VCCA
R84 10VRMS
2
12
1
R5
1
10K
2
R28
120,2W
MICOUT
R4
100
RLY DPDT
DIF+
DIF-
MUTE
TDA2616
Insert
R36
21
C69
STD IN
CWS CUT
12
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
12 12
C74
22UF
2
12
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
12
1
C37
1.0UF
21
2
C75
1
22UF
C72
212
R51
8.2
0.01
2
R9
10K
12
1
+C68
100UF
2
1
C70
22UF
3
4
5
6
7
8
9
1
C80
0.005UF
C83
0.1UF
C32
1000UF
12
+
24V
GND
OUT1
-Vcc
OUT2
INV2
-IN2
+Vcc
IC21
0.01
1
R34
10K
1
C31
22UF
2
+
C82
0.1
1
1
2
12
C81
2
-IN1
4-2
Figure 4-1. Model 300MB Series D Schematic Diagram.