Bogen SERIES 15 Manuale utente

BOGEN

A DIVISION OF LEAR SIEGLER, INC.

MCT-1

MODELS

15-1,

SERIES 15

15T-1,15-2,15-3

DESCRIPTION

The

Bogen

Series 15-1 Centralized School Sound

System is designed to serve up to 50 rooms. It incorpo-

rates one Model MCT-1 Control Center and either one

or two Model SBS-25 Switchbanks, and is housed in a

desk-top consolette. The Series

15T-

1 accommodates up

to 25 rooms and includes one Control Center, one

Switchbank and one Model TP-160B AM/FM Tuner

housed in a desk-top consolette. The Series 15-2 consists

of one Control Center, one or two Switchbanks, one

AM/FM Tuner and one BSR 3-speed record changer. It

is housed in a desk-top, dual consolette and serves up to

50 rooms. The Series 15-3 consists of one Control

Center, one or two Switchbanks, one AM/FM Tuner

and one 3-speed record changer. It can accommodate up

to 50 rooms and is operated from a sturdy free-standing

console.

Each system has one 35-watt program channel and an

independent 4-watt intercom channel. The program

channel has two low-impedance microphone inputs

which can be used balanced or unbalanced. It also has

inputs for radio, phono and tape program sources and a

fader control to select either radio or phono-tape. The

selected program may be used alone or may be mixed

with the microphone program.

The MCT-1 control panel has a loudspeaker which

serves as both a program monitor speaker and an inter-

com transmitter/receiver. By means of the intercom

channel, the operator may hold a two-way conversation

with occupants of any room without disturbing the pro-

gram being transmitted to other rooms. If desired, the

intercom channel also may be used to permit the op-

erator to monitor any selected room through its room

speaker.

Model 15-2

In addition to the control panel, each Series 15

con-

solette or console has one or two switchbanks contain-

ing the individual room selector switches. In the stan-

dard system, these are 3-position lever switches used to

connect each room speaker to either the program (A)

channel or the intercom (C) channel, or to disconnect

the speaker from the system (Systems with optional

light-annunciator call circuit have four-position lever

switches). The units have an Emergency mode of opera-

tion which overrides these selector switches. When

operating in Emergency, the operator can transmit from

the control panel speaker to all room speakers, regard-

less of the settings of the room selector switches or of

other program inputs to the speakers. The Emergency

function operates whether the power switch is on or off.

INSTALLATION

UNPACKING

Inspect the shipping container and unit for indica-

tions of improper handling. The unit was carefully

checked before leaving the factory. If the unit has been

damaged, make an

immediate

claim to the dealer or dis-

tributor from whom it was purchased. If the unit was

shipped to you, notify the transport company without

delay and place your claim.

Printed in USA

8005

CENTRALIZED SCHOOL SOUND SYSTEM

54-5665-04

LOCATION OF

CONSOLE/CONSOLETTE

Where possible locate the console centrally, relative

to the rooms being served, in order to minimize the

length of speaker cables. The rear of the unit must

remain accessible for maintenance and for changing in-

put and output connections. It is advisable that the unit

be oriented in such a manner that the operator, program

director and other interested parties are able to observe

the controls at all times. Provide adequate lighting and

ventilation. Do not locate the unit close to heat sources,

such as radiators and warm-air ducts, or against a wall

which prevents proper ventilation.

The Series 15-1 and

15T-1

consolettes are 21¼” (54

cm.) wide x 16” (40.6 cm.) high x 16” deep. The Series

15-2 consolette is 40½” (102.9 cm.) wide x 16” high x

16” deep. The Series 15-3 console is 22” (55.9 cm.) wide

x 46” (116.8 cm.) high x 31” (78.7 cm.) deep.

POWER

Connect the 3-wire cord with ground to a

105-125V,

50/60

Hz source. Make certain that the ground terminal

of the power receptacle connects to earth ground.

Two 50W AC power receptacles are provided on the

rear panel for a tuner, automatic record changer or aux-

iliary equipment. Line voltage is applied to these com-

ponents when the consolette or console power switch is

on. Plug AC line cords into appropriate receptacle.

INPUT CONNECTIONS

MICROPHONE INPUTS. Two terminal strips on

the rear of the MCT-1 provide for two low impedance

balanced or unbalanced microphone inputs.

Two-

conductor shielded microphone cable should be used

(Bogen

#l008

or equivalent). Connect shield to terminal

TUNER/PHONO-TAPE INPUTS. Two jacks accept

single-conductor shielded cable.

TAPE RECORDER/BOOSTER AMP INPUT. Ac-

cepts a two-conductor shielded cable

(Bogen

BB 8450 or

equivalent).

INTERCOM CALL-IN LINE. Connect parallel lines

from station call-in switches with 2-conductor shielded

cable. Connect shield to terminal 3.

SWITCHBANK

CONNECTION. Eleven-pin plug

connects three shielded pairs plus annunciator wire

from a switchbank. Also accommodates three lines for

optional telephone system.

TIME CLOCK INPUT. Terminal strip connects a

single-circuit time clock, closing contacts to activate the

optional Model SST-l Module.

GENERAL WIRING

RUNNING CABLES

WIRES. Class II wiring may be used for all audio and

annunciator lines. Make certain to properly support

cables to prevent sagging or strain. Keep wires clear of

objects which would subject them to heat, friction, or

other abuse.

Use No. 20 AWG shielded pairs with insulated outer

jacket (Bogen BB-8450, or equivalent) for speaker lines.

Annunciator lines require a third wire, which usually is

No. 22 AWG insulated wire with red insulation (Belden

8937, or equivalent). The number and types of wires

running from each room to the consolette and running

inside the classroom depend upon the type of speaker

operation required. Consult Table I for the wires re-

quired in your particular system.

TABLE I. CABLE RUNNING CHART FOR SERIES 15

Wires from Room to Consolette Wires From Room Switch

to Room Speaker

Type of Classroom Switch or Device Shielded Pair No. 22 AWG

Used with Speaker Shielded Pair

(Jacketed)

Single

Conductor

(Jacketed)

Refer to

(Bogen

BB-8450) Figure

(Belden

8937)

(Bogen BB-8450)

None (Speaker Only)

Call (Model

CA-l0)

Call/Privacy (Model CA-l 1)

111

Voice Call-In, Non-Private

2* 0

2, 7

(Model CA13)

*Alternate method:

Run

two cables from room nearest consolette and one cable from each remaining room. Run

one cable in a loop or branch circuit connecting all room switches.

-2-

OUTLET BOXES. Where flush-mounting switches

are used, single-gang outlet boxes will be installed. In

installing such boxes, make certain to place them in a

location that permits personnel to operate the switch

while communicating via the room speaker. The normal

height (above the finished floor) for room switches is

approximately four feet, while speakers are normally

placed at a height of about seven and one-half feet.

SOLDERING INSTRUCTIONS

SOLDER.

Do not use acid-core solder or acid paste.

Make all solder connections with standard

60/40

resin-

core radio solder. Do not apply excessive heat. Solder-

ing irons or guns from 75 to 200 watts will provide

ample capacity.

GROUNDS.

Do not connect cable shields to earth

ground or to convenient metal objects.

is important to

connect cable shields only as shown in the wiring

diagrams.

CLASSROOM WIRING

CONNECTIONS

Refer to the left-hand column of Table I for the type

of classroom operation used in your system. The corres-

ponding right-hand column calls out the wiring diagram

required. Solder the wires as shown in the proper dia-

gram and wrap with insulating tape.

CAUTION

Make certain to connect

all

wires in accor-

dance with the color codes given on the dia-

gram.

SECURING SWITCHES

The Model CA switches are designed for flush

mounting in a standard single-gang electrical outlet box,

BOGEN

25-VOLT

ROOM

LINE MATCHING

SPEAKER TRANSFORMER

(SEE NOTE-P)

(SEE NOTE-I)

22AWG MIN.(TYP.)

(BELDEN 8937, OR

EOUIV.)

TO CONSOLE ‘SWITCH BANK

BOGEN

25-VOLT

ROOM

LINE MATCHING

SPEAKER TRANSFORMER

(SEE

NOTE-2)

TO CONSOLE

SWITCH BANK

NOTES :

I- CONNECT AS FOR NON-PRIVATE OPERATION, AS FOR NON-PRIVATE WITH ANNUNCIATOR,

OR AS FOR PRIVATE WITH ANNUNCIATOR.

MODEL

TS-2A

(1/2

WATT TAP) SHOWN. SEE TEXT FOR

TS-I6A

TRANSFORMER

AND ADDITIONAL INFORMATION.

Figure

Connection Diagram,

Speaker

Installation

-3-

74-2588-A LINE

Figure 2

Room Speakers with Voice Call-In Switch, Connection Diagram

or for surface mounting in a standard deep single-gang

wire mold outlet box. Install the box in a location which

provides convenient access to both the switch and the

room speaker.

LINEMATCHING TRANSFORMERS

The installation diagrams show

Bogen

line-matching

transformers of

or %-watt capacity (Models TS-025

or TS-05). Other recommended transformers are shown

in figure 3. The console output is designed for a

25-volt

constant voltage distribution system and all system

loudspeakers must be provided with line-matching

transformers.

CAUTION

Speakers and transformers must be proper-

ly matched with respect to power

require-

men ts.

CONSOLETTE WIRING

Remove the Phillips-head screws securing the

louvered pane1 on the rear of the consolette (or console).

There are three rows of solder terminals across the rear

of each switchbank. Each selector switch corresponds

to the three terminals directly behind it, one terminal

from each row.

White tabs are provided for identifying the room con-

trolled by each selector switch. Insert the tabs in the

slots provided in the transparent switch knobs. When

rooms are identified by number, it is common practice

to start numbering the switches from left to right (view-

ing from the front or operator position), starting with

the top switchbank.

SWITCHBANK WIRING

Wire the switchbanks as shown in figure 4. If annun-

ciator lamps are used (Model SBL), always solder the

single annunciator wire to the top solder terminal. For

all switch banks, solder the speaker lines to the center

and bottom terminals, with the shield to the ground bus

bar. This is the only place where speaker shields should

be grounded.

VOICE CALL-IN OPTION

Figure 2 shows the room connections and switch re-

quired for installing an optional voice call-in system.

The wiring must be completed by connecting the

shielded pair from the switch to the terminal strip on the

rear of the MCT-1 chassis. The polarity of the inner

conductors is not critical, but make certain to connect

the cable shield to the shield of the cable already con-

nected to the terminal strip.

Note that only one cable goes to the terminal strip.

Usually, the cables from all room switches are con-

nected by a common control cable and one cable is run

to the consolette. If this type of installation is not prac-

tical, then the control cables for two or more switches

are run to the consolette. In this case, connect all the

cables in parallel in a junction box at the consolette and

run a single control cable from the junction box to the

terminal strip on the MCT-1 chassis.

CALL/PRIVACY OPTION

Figure lc shows the room connections and switch

re-

quired for installing an optional annunciator/privacy

function in the intercom system.

CONTROL FUNCTIONS

All operating controls for the Series 15 Centralized

School Sound Systems are located on the front of the

consolettes (consoles). The Series

15T-1

is equipped

with an AM/FM radio tuner, while the Series 15-2 and

15-3 have both a tuner and an automatic record chang-

er. The operating controls for the tuner and record

changer are described in their individual instruction

manuals.

MCT-1 CONTROL PANEL

The controls on the Model MCT-1 Control Panel are:

POWER ON-OFF SWITCH. Turns the system on and

off.

FUNCTION SELECTOR SWITCHES. These switches

determine the mode of system operation. These operat-

ing modes are:

1. Microphone. Connects microphone input to program

channel (selected by MIC level control).

2. Program. Permits transmission of program material

as determined by program distribution and program

output switches.

3. Intercom. Enables and disables TALK/LISTEN

switch.

4. Emergency. Permits operator to transmit to all sta-

tions via panel speaker, regardless of switchbank set-

tings. Overrides all program and intercom functions.

Operates with power switch On or Off.

5. Talk/Listen. Allows operator to communicate with

room(s) selected on switchbank without affecting pro-

gram distribution to remaining rooms. Enabled by In-

tercom switch; depress to talk, release to listen.

CONSOLE SWITCH BANK

TYPE SBL SWITCH

SHIELDED PAIR

(BOGEN

BB-8450, OR EOUIV.)

NOTES

I-TERMINALS CORRESPOND TO SWITCH ON OPPOSITE

SIDE OF FRONT PANEL.

2-DRESS SPEAKER LEADS TO PREVENT SHORTING

LOWER TERMINALS TO GROUND BUS.

Figure 4

Consolette Switch Bank, Connection

Diagram

LEVEL CONTROL SWITCHES

1. Microphone. Fader control sets level of Mic 1 or Mic

2 program as indicated on output meter. May be used

with Program level control for mixing.

VOLTS

TS-2A

RED

SEC

16A

OHMS

ONDARY

OHMS

SECONDARY

l/8

RED

l/4

BLK/YEL

l/2

w YEL

I w YEL

TS-

16A

POWER

TAP

8 w

CENTER

TAP

WHT

ORN

Figure 3

Bogen Line-Matching Transformers

-5-

2. Program. Fader control sets level of radio or

phono/

tape program as indicated on output meter. May be

used with Microphone level control for program

mixing.

3. Intercom. Sets outgoing level of intercom transmis-

sion to room speakers.

4. Monitor. Sets panel speaker level in program and

intercom modes.

5. Tone. Provides flat response or reduces high-fre-

quency response as control is moved toward HI CUT.

PROGRAM OUTPUT METER. Color-coded to clearly

display 25 V reference level.

PROGRAM SWITCHES

Program Distribution. Functions when program

output selector is in SEND.

NORM(a1)

position pro-

vides switchbank control over program distribution.

ALL position distributes program to all rooms not con-

nected to the intercom.

2. Program Output. SEND position enables program

distribution switch. SET position disconnects program

output from load for monitoring or presetting prior to

distribution. Does not offset intercom functions. The

program output switch should not be left in the SET

position. Once adjustment is made, switch should be

returned to SEND position.

SWITCH BANKS

MODEL SBS SWITCHBANK. Standard consolettes

are equipped with one or two Model SBS Switchbanks.

Each switchbank has 25 three-position lever switches

for connecting individual rooms to the system. Each

switch functions as follows:

(Up position)

Connects classroom speaker to

program channel for distribution of microphone, radio,

or phono program.

(Center position)

Disconnects classroom speaker

from system, except when consolette is operating in

Emergency mode.

(Down position)

Connects classroom speaker to

intercom channel.

MODEL SBL SWITCHBANKS (OPTIONAL). If

the system is equipped with an optional light-annunci-

ator call system, the consolette switchbanks will have

four-position lever switches. These switches operate

exactly as those in the Model SBS Switchbank, except

that there is a “B” (top) position of the switches which

is not used. If a switch is placed in the “B” position, it

functions exactly the same as in the “A” position.

OPERATION

NOTE

Before attempting to operate for the first

time after installation, check all input and

output connections and make certain the

consolette is connected to a power outlet.

TO TURN

CONSOLETTE-ON

Set POWER ON-OFF switch to ON position.

TO DISTRIBUTE MICROPHONE

PROGRAM

Move program output switch to SET position. De-

press MIC function switch. Select microphone level with

MIC fader control knob according to

contro1

panel

speaker volume and/or reading on PROGRAM LEVEL

output meter. When appropriate level is reached, dis-

tribute program by moving program output switch to

SEND position. Select either NORM for Switchbank

control over distribution or ALL for distribution to all

stations not connected to the intercom. (May be used in

conjunction with PROGRAM level control for program

mixing).

TO DISTRIBUTE RADIO/PHONO-TAPE

PROGRAM

Move program output switch to SET position. De-

press PROG function switch. Select level of radio/

phono/tape

program with PROGRAM fader control

knob according to control panel speaker volume and/or

output meter reading. Distribute program by switching

program output to SEND position.

To distribute output from a tape recorder, connect

the 2-conductor phone plug from the tape recorder to

TAPE IN jack on the control panel and follow pro-

cedure outlined above. Phonograph input will be auto-

matically disconnected.

TO OPERATE ALL-CALL FUNCTION

Move program output switch to SEND position.

Move program distribution switch to ALL position.

Program is transmitted to all stations regardless of posi-

tion of station selector switches. (Note: Disconnect in-

tercom function; stations connected to the intercom will

not be affected).

TO COMMUNICATE WITH SELECTED

STATIONS

TO SEND. Depress INTERCOM function switch.

Select station to be contacted on switchbank panel.

Depress TALK/LIST switch to send; release switch to

monitor. Intercom level control should always be left at

the setting for normal transmission to room speakers.

(Note: does not affect program distribution to other

stations).

TO RECEIVE. If a voice call-in system is installed,

the station operator makes contact over the intercom

channel via the station speaker and CA-13 call switch,

and identifies his or her station. To respond to call,

select station on switchbank and depress TALK/LIST

-6-

switch. Speak clearly into the control panel speaker

from a distance of approximately 12” (Note: Intercom

function switch must be depressed to receive VOICE

CALL IN from stations).

TO OPERATE EMERGENCY

Depress

EMERG

switch and speak clearly into panel

speaker. Message is transmitted to all stations regardless

of switchbank settings, program and intercom function

settings, and position of POWER ON-OFF switch.

ACCESSORY EQUIPMENT

LIGHT-ANNUNCIATOR CALL SYSTEM

If a light-annunciator call-in function is installed, the

optional Model SBL Switchbank panels have an annun-

ciator lamp above each station selector switch. Each sta-

tion has a call switch to light the appropriate lamp.

When lamp lights, move the corresponding switch to

“C”

position. The intercom channel is now open for

normal intercom communication. The control panel

also has a built-in tone alert to provide audible annunci-

ation that supplements switchbank lamps.

PRIVACY FUNCTION

Prevents the console operator from monitoring the

speaker station if the station is provided with the op-

tional CA-l 1 CALL/PRIVACY Switch. A station in

the Privacy mode will still receive messages from the

consolette.

TIME TONE OPTION

The external single-circuit time clock closes contacts

that are normally open to activate the optional Time

Tone Module SST-l for timed, preset signals to station

speakers. Connects to terminal strip on the rear of the

control panel.

EXTERNAL BOOSTER AMPLIFIER

Model MT-60A or MT-

125B

(60 or 125 watts) provide

increased power output. To install, remove the MCT-1

top cover and cut the jumpers on the terminal strip

between points A, B and C, D as shown in figure 5.

Insert two-conductor shielded cable in hole F. Connect

25 V balanced output leads to terminal strip points B

and C. Connect the shield to E. Attach the cable from

the Tape Out/Booster output jack on the rear of the

MCT-1

to the Hi-Z input of the MT-60A or MT-125B.

Figure

Connecting Booster-Amplifier

MAINTENANCE

CAUTION

There are no user-replaceable parts within

the unit. Have all in

ternal

servicing done by

qualified service personnel.

BOGEN SERVICE

We are interested in your

Bogen

equipment for as

long as you have it. If trouble ever develops, do not

hesitate to ask our advice or assistance. Information can

be obtained by writing to Service Department,

Bogen

Division, P.O. Box 500, Paramus, N.J. 07652.

When communicating with us, give the model and

series designation of your unit. Describe the difficulty

and include details on the electrical connections to asso-

ciated equipment, and list such equipment. When we re-

ceive this information, we will send you service infor-

mation if the trouble appears to be simple. If the trouble

requires servicing, we shall send you the name and ad-

dress of the nearest

Bogen

authorized service agency to

which you can send your unit for repairs.

When shipping your unit, pack the amplifier well,

using the original shipping carton or a similar container

and filler material to prevent damage in transit. Send

the unit, fully insured and prepaid, via any responsible

carrier. The unit will be promptly repaired and returned

to you express collect.

-7

TECHNICAL SPECIFICATIONS

Rated Output: Program: 35 Watts

Intercom: 4 watts

Frequency Program:

100

to 20,000 Hz 2

Response: Intercom: Shaped for best voice

articulation.

Distortion: Less than 3% @

Watts:

100

10.000 Hz

Noise Level: Microphone: -50

Radio/Phone: -60

Sensitivity

Microphone: 300

µV

Radio/Phone:

100

Tape In:

100

Intercom:

Inputs: 2 Microphones (Lo-Z, balanced or

unbalanced)

Radio

Phono

Tape In (Front Panel)

outputs: Program: 25 Volts balanced

Intercom: 25 Volts balanced

Tape Out/Booster: 2 Volts

Switches: Pushbutton Type: Microphone. Pro-

gram, Intercom, Emergency, and

Talk/Listen.

Program Send/Preset

Program Normal/All Call

Power On/Off

Controls: Mic Volume (fader-MIC

l/MIC

Program Volume

(

Radio/Phono-Tape

fader)

Intercom Level

Monitor

Tone Hi Cut/Flat

Indicators: Illuminated output meter

Dimensions Width Height Depth

(Inches

Cm):

MCT-I Control Panel

l9(48.3)

5¼(

13.3)

l½(29.2)

Series

15-l

(I5T-1)

Consolettes

21¼(54) 16(40.6) 16(40.6)

Series

15-2

Consolette

40½(

102.9)

I6(40.6) I6(40.6)

Series

15-3

Console 22(55.9)

46(116.8)

3 l(78.7)

Finish: Back and Sides-Satin Mocha

Control Panels-Desert Beige

Optional

Equipment: Model SBL Switch Banks, for use

with visual and audible annunication.

Model SST-

A Single-Circuit Mod-

ule, for classroom change signals.

Room switches, for use with intercom:

Model CA-IO Call switch. Model

CA- I I Call/Privacy switch, Model

CA-13 Voice Call-In switch.

ADJUSTMENTS

(For Qualified Service Personnel Only)

CAUTION

The follo wing adjustments require removal

of the top cover. Use standard precautions

to prevent electric shock or accidental short

circuits within the unit.

OUTPUT METER ADJUSTMENT

This is a factory adjustment that normally is not re-

quired in the field. If a meter replacement is required, a

calibration adjustment may be needed. Proceed as

follows:

Feed a 1 kHz input signal in radio or phono jack.

Connect an A.C. V.T.V.M. across half the program

line (Pin 6 and 1 on output socket). With program

level control adjusted to read 12.5 volts on the

V.T.V.M., turn the meter control R102 (potenti-

ometer nearest to front panel) until the needle reaches

the black mark on meter scale.

EMERGENCY LEVEL ADJUSTMENT

This is a factory adjustment that sets the emergency

output level the same as the intercom output level. If it

is necessary to adjust this level, turn the level control

RlOl

(potentiometer furthest from front panel) clock-

wise to increase output.

REPLACING COMPONENTS

All semiconductor components on the printed circuit

board are soldered in place to ensure maximum reliabil-

ity. When soldering or unsoldering transistors or

diodes, use a heat sink (such as a small alligator clip)

between the component and the source of heat. When

replacing driver and output transistors (QlO-Qll), be

certain to install the collector insulator, after lightly

coating both sides with a thermal conducting compound

(such as Dow Corning No. 340, or equivalent).

REPLACEMENT PARTS

Most components used in

Bogen

equipment are

standard parts available through reputable parts deal-

ers. This section lists those parts which should be re-

placed with genuine

Bogen

parts, available through

Bogen

distributors, service agency or directly from the

factory.

When ordering a part, give the part number and de-

scription as listed below. Specify the model of the unit.

For parts in the MCT-1 control chassis, specify the

series designation, which is a letter followed by numbers

and is stamped or screened on the rear of the chassis.

-8-

Fader control for

setting

level of radio or

phono/tape program,as indicated on output

meter. Mav be used with

MlC

level control for

program mixing.

MIC LEVEL CONTROL

Fader control for setting level of Mic 1 or Mic 2

program as

indicated

on output meter. May be

used with PROGRAM level control for mixing.

MICROPHONE FUNCTION SWITCH

When IN, connects microphone input, selected

by MIC level control, to program channel.

PROGRAM FUNCTION SWITCH

When IN,permits transmission

material as determined by program

and program output switches.

INTERCOM FUNCTION SWITCH

PROGRAM OUTPUT M ER. Color coded to

clearly display 25V refe ce level.

gency

transmissions, two-way intercom

SPEAKER. For program monitoring,

emer-

communication.

POWER SWITCH. Controls ac power to panel

and to equipment connected to rear panel con-

venience

outlets.

TONE ALERT (OPTIONAL). Provides audible

annunciation to supplement lamps on switch

When

IN, enables intercom Talk/Listen switch.

EMERGENCY SWITCH l

When IN. permits operator to

panel speaker) to all classrooms, regardless of

switch bank settings. Overrides all program and

intercom functions. Operates

when

POWER switch is OFF.

TALK/LIST(EN)

SWITCH .

When enabled by INTERCOM function switch.

permits operator to communicate with

room

selected

on switch bank without effecting pro-

gram distribution to remaining rooms.

De-

Pressed for TALK; released for

LIST(EN).

lPROGRAM OUTPUT SWITCH. SEND position

enables program distribution switch. SET posi-

tion disconnects program output from load for

monitoring or presetting prior to distribution.

Does not effect intercom functions.

lTAPE RECORDER INPUT. For playing output

from tape recorder on program channel. Ac-

Figure 6

Front view, MCT-1 Control Panel

cepts

standard 2-conductor phone plug which,

when inserted, automatically disconnects phono-

graph input.

AC POWER INPUT

3-wire cord with

50/60

Hz source. Ci

panel andconvenience outlets.

CONVENIENCE OUTLETS

Each provides up to

or other auxiliaryequipme

front panel POWER switch.

TIME CLOCK INPUT .

For connecting external single-circuit time

clock. Clock closes normally open contacts to

activate optional Model SST-1A Module.

SWITCH BANK CONNECTION .

Cable terminated in Il-pin plug connects three

shielded pairs plus annunciator wire from

switch bank. Also accommodates three lines for

optional telephone system.

MICROPHONE INPUTS. For low-impedance

balanced or unbalanced

mics.

Use 2-conductor

microphone cable

(Bogen

1006. or equiv.). Con-

nect

shield to terminal 1.

PHONO INPUT Single-conductor

TUNER INPUT shielded cable.*

INTERCOM CALL-IN LINE. Parallel

lines

from

classroom call-in switches. 2-conductor shielded

cable

(Bogen

6450, or equiv.). Connect

shield to terminal 3.

TAPE RECORDER/BOOSTER INPUT. For recording

program material on external tape recorder and connecting

external booster

amplifier

2-conductor

shielded cable

(Bogen

8450, or equiv.).’

*Accepts Cinch 13A. or equivalent.

Figure 7

Rear view, MCT-1 Control Panel

Schematic

Reference Part No. Description

C3A,

3B, 4B, 12

C7A, 7B

c17, 20, 28

C23

C26

C27

CR-I, 2

IC1

Ql-7

45-9995-01

79-008-03 1

Q-8

Q-9

Q-IO

Q-11

Q12

R30, 35

R39

79-008-o 11

79-008-053

79-008-045

79-008-030

79-008-049

96-53373-O 1

96-5396-O 1

96-5213-01

96-5346-O 1

96-5298-01

%-5283-O 1

96-5357-O 1

96-5356-O 1

96-5290-o 1

76-107-105

76-

147-087

S-l

Switching

45-9996-01 P.C. Board Assy.

96-5333-01

Diode, 400 piv,

81-004-077 P.B. Switch w/knobs

Chassis Electrical Parts

Cl02

79-509-050

Cl03 79-009-070

Cl05

79-009-052

Cl06 79-005-050

Cl07

79-509-O 14

CBlOl

94-00 17-04

CB102

94-00 14-04

CR101 96-5202-01

CR102

96-5333-01

CR103-106

96-5241-01

P.C. Board Assy, Amp.

Capacitor, Electrolytic,

l0µF,

16V

Cap., Electrolytic,

330µF,

Cap.,

Electro.,

lOOµF, 35V

Cap.,

Electro.,

330µF,

25V

Cap.,

Electro.,

lOOµF,

1OV

Cap.,

Electro.,

500µF,

35V

Diode, 400 piv,

Integrated

Circuit; TBA

800

Transistor, 2N5089 or

Transistor, BC 239C

Transistor, SPS-l910

Transistor,

MPS-A5

Transistor, 2SD-389 (P)

Transistor, 2SB 512 (P)

Transistor, MPS-A05

Resistor,

4.7R,

Resistor,

lR,

½W

Capacitor, Electrolytic,

1500µF, 75V

Cap., Electrolytic,

500µF,

75v

Cap.,

Electro,

22OOµF,

35V

Cap.,

Electro.,

lOOµF, 25V

Cap.,

Electro.,

500µF, 50V

Circuit Breaker, .93A

Thermal Breaker

Triple Diode, HVR-3

Diode, 400 piv,

Diode, 300 piv, 3A

Schematic

Reference

PL-101

Q101-102

RlOl,

102

R103, 104

R105, 106

R107

Rl10

R114

R118

Ml01

KlOl

SPlOl

SWlOl-103

TlOl

T103

T104

T105

YlOl

Part No. Description

94-o 197-O 1

96-5232-02

77-00 l-576

77-00 l-763

77-00 l-762

77-00 l-76 1

76-

113-099

75-742-25 1

75-742- 100

94-1097-O 1

90-0037-O 1

93-0047-01

8 I-003-022

45-702 1-O 1

45-9999-o 1

83-449-000

45-9998-O 1

94-1361-01

03-0590-O 1

Pilot lamp, # 19

Transistor

Control, Level Adj.,

Control, Mic./Prog.

Volume, 1 M

Control, Intercom/Tone,

½M

Control,

Monitor/Emerg.

200R

Resistor,

,27R,

Resistor,

250R,

Resistor,

lOOR,

Meter w/mounting bracket

Relay

Speaker,

3½“,

45R

Switch, Slide, DPDT, 3A

Transformer, Power

(83-759-c-O)

Transformer, Intercom

Output (83-428-000)

Transformer, Intercom

output

Transformer, Intercom

Input (83-054-000)

Sonalert

Assy.

Knob

Switchbanks

81-005-035

Lever Switch Assy (SBS-25)

81-005-036 Lever Switch

(SB/SBL-25)

94-0221-07 Pilot Light (SBL-25)

94-0310-03 P.L. Cap (SBL-25)

03-0550-O 1

Knob

Cabinet Parts

82-2254-01 Cable Assy

82-2246-O 1

“J”

Cable Assy

Figure 8

Output Cable

-lO-

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