Broadcast Electronics 3000 Series User manual

L 1 September 1981
IM No. 597-0300
L • I
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BROADCAST ELECTRONICS INC .
I,

IMPORTANT INFORMATION
EQUIPMENT LOST OR DAMAGED IN TRANSIT
When delivering the equipment to you, the truck driver or c ar rier's agent will present a receipt
for your signature. Do not sign it until you have (a) inspected the containers for visible
signs of damage and (b) counted the containers and compared with the amount shown on the ship-
ping papers.
If a shortage or evidence of damage is noted, insist that notation to that effect
be made on the shipping papers before you sign them.
Furth er, after receiving the equipment, unpack it and inspect thoroughly fo r concealed damage.
If concealed damage is discovered, immediately notify the carrier, confirming the notification
in writing, and secure an inspection report. This item should be unpacked and inspected for
damage WITHIN 15 DAYS after receipt. Claims for loss or damage will not be honored without
proper
notification of inspection by the carrier.
TECHNICAL ASSISTANCE AND REPAIR SERVICE
Technical assistance is available from Broadcast Electronics by letter or prepaid telephone
or telegram.
Equipment requiring repair or overhaul sho uld be sent by common carrier, prepaid,
insured
and well protected. Do not mail equipment. We can assume no liability for inbound
damage, and necessary repairs become the obligation of the shipper. Prior arrangement is
necessary. Contact Customer Service Department for a Return Authorization.
FOR TECHNICAL ASSISTANCE
Phone [phone] Customer Service
WARRANTY ADJUSTMENT
Broadcast Electronics, Inc. warranty is included in the Terms and Conditions of Sale. In the
event of a warranty claim, replacement or
repair parts will be supplied F.O.B. factory. At
the discretion of Broadcast Electronics, the customer may be required to return the defective
part or equipment to Broadcast Electronics, Inc. F.O.B. Quincy, Illinois. Warranty replacements
of defective merchandise will
be billed to your account. This billing will be cleared by a
credit issued upon return of the defective item.
RETURN, REPAIR AND EXCHANGES
Do not return any merchandise without our written approval and Return Authorization. We will
provide special shipping
instr uctions and a code number that will assure proper ha ndl ing and
prompt issuance of credit. Please furnish complete details as to circumstances and reasons
when requesting return of merchandise. All returned merchandise must be sent freight prepaid
and properly insured by the customer.
REPLACEMENT PARTS
Replacement and Warranty Parts may be ordered from the address below. Be sure to include
equipment
model and serial number and part description and part number.
Broadcast Electronics, Inc.
4100 N. 24th St., P.O. Box 3606
Quincy, Illinois 62305
Tel: (217} 224-9600
Telex: 25-0142
Cable: BCST ELECT QUI
PROPRIETARY NOTICE
This document contains proprietary data of Broadcast Electronics, Inc. No disclosure, repro-
duction, or use of
any part thereof may be made except by prior written permission.
MODIFI CATIO NS
Broadcast Electronics, Inc. reserves the right to modify the design and specifications of the
equipment in this manual without notice. Any modifications shal l not adversely affect per-
formance of the equipment so modified.
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AUTHORIZED SERVICE CENTERS
• Equipped to serve you with Broadcast Electronics
parts and repairs-both in and out of warranty
UNITED STATES
1. Riggins Electronics 4. Radio Systems Design
3272 E. Willow St. 5131 West Chester Pike
Long Beach,
CA 90815 Edgemont, PA 19028
Ph: [phone] Ph: [phone]
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2. Oyma Engineering Rhode Island
213 Pueblo Del Sur Vermont
Box 1697
Taos, NM 87571
5. Southeast Electronics
Ph: [phone] 1125 Rosselle St.
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Colorado Jacksonville, FL 32203
New Mexico
Ph: [phone]
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Texas
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3. TV Engineering Corporation North Carolina
580 Goddard Ave. South Carolina
Chesterfield, MO 63017 Tennessee
Ph: [phone] Virginia
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Arkansas Missouri
Kansas Mississippi
Louisiana Nebr?ska
6.
7.
8.
• Regional depots reduce parts delivery time and
repair turn~around time
CANADA
Allied Broadcasting Equipment 9. Nortec West, Ltd.
635 South E. St. 325 West Fifth Avenue
Richmond,
IN 47374 Vancouver VSY 1J6,
Ph: [phone] B.C., Canada
Ph: [phone]
States Covered:
Illinois Provinces Covered:
Indiana British Columbia
Kentucky
Michigan Yukon Territory
Ohio 10. Nortec West, Ltd.
70568 Farrell Road
Electronic Industries Calgary, Alta., Canada
19 East Irving Ave, Ph: [phone]
Oshkosh,
VVI 54902
Ph: [phone] Provinces Covered:
States Covered: Alberta
Iowa Manitoba
Minnesota
NW Territory
Montana Saskatchewan
North Dakota
South Dakota 11.
J~Mar Electronics, Ltd.
Wisconsin 6 Banigan Drive
Wyoming Toronto M4H 1E9,
Midwest Telecommunications Ontario, Canada
4720MB Boston Way Ph: [phone]
Lanham (Wash., D.C.) MD 20801 Provinces Covered:
Ph: [phone] New Brunswick
States Covered: Nova Scotia
District of Columbia Ontario
Delaware Quebec
Maryland
BROADCAST ELECTRONICS INC.
4100 N. 24th ST • P 0. BOX 3606 • QUINCY. IL 62301
TELEX 250142 • CABLE: BCST ELECT QUI • PHONE [phone]

PARAGRAPH
SECTION I
1-1
1-2
1-3
1-4
SECTION
II
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
SECTION III
3-1
3-2
3-3
3-4
SECTION IV
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
TABLE OF CONTENTS
INTRODUCTION
Introduction
Genera1 Description
Equipment
Identification
Specifications
INSTALLATION
Desk Mounting
Rack Mounting
Filler Panels
Audio Output Connections
Audio Input Connections
Optional Microphone Input
Remote Control Connections
Recorder-Reproducer Remote Control
Power Connections
OPERATION
Playback
Recording
Optional Auxiliary
Cue Tones (Q-Trips)
Delay Option
THEORY OF OPERATION
PAGE NO.
1
1
1
3
5
5
5
5
5
7
7
8
8
10
10
11
12
Playback/Logic Board Circuit Description 13
Configuration 13
Program Circuitry 13
Cue Track Audio and One Kilohertz Stop Sensor 14
Optional Three Kilohertz Stop Sensor 14
Optional Q-Trip Sensors 15
Stop/Start Logic 15
Power Supply Board 15
Configuration 15
Voltage Supp 1ies 16
Solenoid Control 16
Fast Forward and Q-Trip Relays 16
Record Amplifier/Bias Board 17
Configurations 17
Bias Oscillator 18
Program Track Record and Bias Control Circuitry 18
Cue Circuitry Bias Control 19
Record Control and Tone Generator Board 19
Configurations 19
Record Logic Flip-Flop 20
One Kilohertz Stop Cue Generator and Control 20
Auxiliary Cue Tone Generators and Control 21
VU Meter Amp 1i fi er 22
Delay Option 22
i

PARAGRAPH
SECTION V
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
5-28
5-29
5-30
5-31
5-32
5-33
5-34
5-35
5-36
5-37
5-38
5-39
5-40
5-41
5-42
SECTION VI
PAGE NO.
MAINTENANCE
Routine Maintenance 23
Ex tender Board 23
Component Replacement on Printed Circuit Boards 23
Module Locations and Adjustment Points 24
Electronic Adjustments 24
General 24
Program Playback Adjustments 25
Output Level 25
Playback Equalization 25
VU Meter Calibration (Record Units Only) 25
Cue Sensitivity Adjustment 25
Program Record Adjustments 26
Bias Trap Tuning 26
Program Bias Level 26
VU Meter Calibration 27
Record Equalization 27
Cue Record Adjustments 27
Bias Trap Tuning 27
Cue Bias Level 27
Cue Tone Generator Frequency 27
Mechanical Adjustment and Maintenance 27
Mechanical System 28
Maintenance 28
Cleaning 28
Demagnetizing 28
Cartridge Maintenance 28
Mechanical Parts Replacement 29
Motor Replacement 29
Pressure Roller Replacement 30
Power Transformer Replacement 30
Tape Head Replacement 30
Solenoid Replacement 30
Solenoid Chain Replacement 31
Solenoid Plunger Adjustment 31
Tape Deck Adjustments 31
Pressure Roller Adjustment 31
Release Speed Adjustment 32
Tape Head Alignment 32
General 32
Tracking Height and Zenith 32
Azimuth 33
Stereo Phasing Test 33
PARTS LIST AND DRAWINGS
35
i i

SECTION I
INTRODUCTION
1-1. INTRODUCTION
This section provides equipment identification, a discussion of
equipment
features, and list equipment specifications.
1-2. GENERAL DESCRIPTION
The Series 3000 Cartridge machine is available in a wide range
of
monaural or stereophonic models to accomodate all sizes of cartridges
(see Figure 1-1). The Series 3000 is the first Broadcast Electronics Series
to incorporate
an automatic release deck. The units can be rack or desk
top
mounted. A large air damped solenoid and a rugged machined surface
ensures
trouble-free operation in continuous use.
Total
power consumption is low. An efficient hysteresis syn-
chronous drive motor
and a power conserving solenoid circuit keep total
power consumption below 45 watts. There is no excessive heat build up to
damage tape while still offering direct tape drive and optional fast
forward features.
Quality construction is standard with the Series 3000. All
components are readily available types chosen for proven dependability.
Modern integrated circuits, gold plated card edge contacts, and internally
shielded audio sections are among many features. Adjustments are accessible
and modular contruction is employed throughout.
Balanced transformer outputs are provided
on all models. Full
remote control
is provided at a rear panel receptacle. Mating connectors
are supplied
for all interconnections. Field effect transistor output
switching
is built into each machine to permit easy equipment paralleling.
The Series 3000 incorporates the Phase Lok IV head bracket which,
allows independent azimuth adjustment to assure extremely close control of
stereophonic phasing while permitting easy adjustment.
1-3.
EQUIPMENT IDENTIFICATION
The Model 3100 is available as a monaural or stereophonic play-
back unit for NAB size A cartridges. Three 3100 models can be mounted in a
single
19 inch (48.26 em) rack.
The Model 3200 is available as a playback unit or with the record/
playback option
for monaural or stereophonic operation. The 3200 accepts
both
NAB size A orB cartridges. Two units can,mount in a single 19 inch
(48.26
em) rack.
The Model 3300 is available in the same configuration as the model
3200 but accepts NAB size A, B, or C cartridges. A 3100 playback may be
mounted next to the 3300 unit in a 19 inch (48.26 em) configuration.
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The Model 3200 and 3300 machines are also available for delayed
record/playback operation. These are designed
as Models 3200 RP/DL and
3300 RP/DL respectively. These models can be operated in either a "delay"
or "normal"
mode. The time span of the delay is determined by the length
of the tape
on the cartridge. This can vary from six seconds, for example,
to provide
ample time for editing words or comments inappropriate for broad-
cast on telephone talk shows; or up to 3D-minutes on C-size cartridges for
delayed rebroadcast of network programs.
Both secondary 150 Hz and tertiary 8 kHz cue tone circuitry is
available in record or playback only models. The secondary cue tone in-
stalled in units equipped with fast forward provides automatic fast cueing
at the end of a message. The fast forward option is available in all models.
Alternate tape speeds
and line voltages and frequency standards are also
available. In record models, a provision for microphone input is available.
1-4. SPECIFICATIONS
The following list provides electrical and physical specifications
for the 3000 series audio cartridge machines.
PARAMETER
Tape Speed:
Fast-Forward {optional):
AC Power Requirements:
Noise (Reproducer):
Monophonic:
Stereophonic:
Distortion:
Equalization:
Frequency Response:
3
SPECIFICATIONS
7.5 in/s (19.05 cm/s) ±0.1%
22.5 in/s (57 cm/s)
105 to 125 V/210 to 230 V; 50 or 60 Hz
45 to 50 W maximum
62 dB or better below reference of
400 Hz at 3% THD; 54 dB below 160 n
Wb/m at 1 kHz.
60 dB or better below reference of
400 Hz at 3% THD; 52 dB below 160 n
Wb/m at 1 kHz.
2% or less record to playback at 160 n
Wb/m at 1 kHz.
NAB, IEC, CCIR as specified.
±2 dB from 50 Hz to 15 kHz exclusive
of
head contour effect.

PARAMETER
Crosstalk (magnetic head limited):
Input Impedance (Recorder):
Microphone (optional):
Line:
Input Levels:
Microphone (optional):
Line:
Audio Output:
Peak Output Level:
Cue Signals:
Ambient Operating Temperature:
Bias
Oscillator Frequency:
Dimensions:
3100:
3200:
4
SPECIFICATIONS
Cue Channel to program channel,
monophonic
150 Hz: -50 dB or better
1000 Hz: -55 dB or better
8000 Hz: -50 dB or better
Stereo, crosstalk between program
channels; better than 50 dB, 50 Hz
to 15 kHz.
150 Ohms (transformer) balanced
floating.
50 k Ohms (transformer) balanced
floating.
-70 to -24 dBm
-24 to +20 dBm (50 mV to 7.7 V).
Maximum adjustable level +8 dBm from
160 n Wb/m at 1 kHz: 600 Ohms
(transformer) balanced.
+20 dBm before clipping.
Relay contact closure for external
contra1
(150 Hz, 8 kHz). Externa1
cue/input/output available at remote
control
for other control functions.
0° to 55° C (32° to 132° F).
100 kHz
5.25 inches H, 5.875 inches W, 15.5
inches D (13.3 X 14.9 X 39.4
em)
5.25 inches H, 8.75 inches W, 15.5
inches D (13.3 X 29.8 X 39.4
em)

SECTION II
INSTALLATION
2-1. DESK MOUNTING
To Desk Mount, install four rubber feet into the holes in
the bottom cover of the
unit. Awrap-around housing mounts into holes
in the sides of the chassis.
2-2. RACK MOUNTING
To Rack Mount, remove the top and bottom covers and install
any filler panels in the front of the adapter shelf. Mount the adapter
shelf in the rack opening from the front, securing the shelf with No. 10
screws driven from the front through the trim spacers and the rack shelf
into the rack rail. Place the units into the adapter shelf from the front
and secure with the captive fasteners installed at the rear of the shelf.
2-3. FILLER PANELS
Filler Panels are available in 1/3 and 1/2 rack widths. Mounting
is accomplished by sliding the fill panel into place in the rack chassis and
securing it in place from below with the flat head screws supplied.
2-4.
AUDIO OUTPUT CONNECTIONS
The playback
driving a
600 Ohm load.
P4 provides easy access
audio output
The nominal
to the audio
is balanced with a low impedance for
output level of the playback is +8 dBm.
(see Figure 2-1).
For Monaural playback connect channel A program line to terminals
3
and 5 of output jack J4. For Stereo operation connect channel B program
line to terminals 4 and 6 of J4.
To ground the shields of the output cables at the cartridge unit
tie the external shields to pins 1 and 2 of output jack J4. If the output
shields are to be grounded at the console, no connection to pins 1 or 2
should
be made.
2-5. AUDIO INPUT CONNECTIONS
Audio Input to the Record Amplifier is by means of Input Jack J4
(see Figure 2-1). The input is high (50k Ohms) impedance bridging for
signals from -24 to +20 dBm (50 mV to 7.7 V) level. Channel A input is by
means of contacts 3 (high), and 5 (low) of J7. For Stereo, use contacts 4
(high)
and 6 (low) for channel 8 input.
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2-6. OPTIONAL MICROPHONE INPUT
Record models are available with an optional microphone input
through a
rear panel socket. This input is designed for 150 Ohm balanced
microphones with
an output level of -70 to -24 dBm.
NOT IE
WHEN OPERATING WITH THE MICROPHONE INPUT, DIS-
CONNECT THE LINE INPUT. SET THE GAIN SWITCH
(TWO FOR STEREO) ON THE RECORD AMPLIFIER/BIAS
MODULE TO HI.
2-7. REMOTE CONTROL CONNECTIONS
A rear panel 24-pin cinch connector allows connection of remote
stop, start, and record controls along with the associated indicators.
When the optional auxiliary cue tones (QI 150Hz and QII 8kHz) are in-
stalled, the normally open relay contacts are accessible. These contacts
provide a closure during tone playback.
In record models, the optional
cue tone generators may be remotely controlled.
Terminals are also provided for supplying an external signal to
the recorder cue track and for access to the cue track playback audio.
When external cue recording is employed, the EXT CUE record control is also
required.
REMOTE START AND STOP SWITCHES
Connect two wires from a SPST (normally open) momentary push-
button switch to pins
13 and 11 for remote start. Connect switch between
pins
10 and 11 for remote stop. The Play and Ready indicators should be
connected from pins 15 and 12 respectively to pin 11.
REMOTE FAST FORWARD
Connect two wires from a SPST switch between pins 7 and 4 of J5.
REMOTE END CUE AND TRIP CUE LIGHTS
Connect two lamps from pins 5 and 8 respectively to pin 11
(+24V). Connect pins 6 and 9 to pin 14 (ground).
CUE OUT
The cue out signal is available from pins 1 and ground (pin 2)
for Data Logging. Output is a 0.5 volt into a 10,000 Ohm load resistance.
7

2-8. RECORDER-REPRODUCER REMOTE CONTROL
The Record-Reproduce units and the Reproduce units have identical
remote functions. However, the Record-Reproduce units have the following
additional
features.
RECORD SWITCH AND LIGHT
Connect two wires from a SPST switch between pins 16 and 17.
Connect the Record Indicator from pin 18 (Record LT) to pin 17 (+24V).
REMOTE SEC CUE AND TER CUE RECORD PUSHBUTTONS
Connect two wires from a single pole momentary pushbutton be-
tween pins 19 (EXT. SEC CUE) and 22 (EXT. TER CUE) to pin 20 (+24V) to
record
trip cues remotely.
REMOTE CUE RECORD
The remote cueing feature allows for the recording of other than
the standard cue tone
for Data logging or other external functions. To
record cue tone connect a SPST switch from pin 21 (Cue Bias Enable) to pin
20 (+24V). Connect the signal to be recorded to pins 23 (Cue Input High)
and 24 (Cue Input Low). When the switch grounds the Cue Bias Enable line
the signal input will be recorded on the cue track. Nominal input level is
0.5 V rms into an input impedance of 10k Ohms.
2-9. POWER CONNECTIONS
The 3000 Series Cartridge Machines are shipped completely ad-
justed and wired for operation on 117 V 60 Hz ac power. Optional 220 V
50 Hz power is available.
8

Table 3-1
NOMENCLATURE
POWER
SPST Switch
STOP
Pushbutton/Indicator
Switch
Ready Indicator
START
Pushbutton/Indicator
Switch
Play Indicator
SEC-CUE
Indicator
TER-CUE
Indicator
FAST FORWARD SWITCH
Fast Forward Manual
RECORD
Pushbutton/Indicator
Switch ·
LEVEL
Potentiometers
SEC-CUE
Pushbutton
Switch
TER-CUE
Pushbutton
Switch
SECTION III
OPERATION
Front Panel Controls and Indicators
9
FUNCTION
Controls the application of ac power.
Stops tape and reverts system to Ready
mode. Lights to indicate that system
is in Ready mode of operation and
cartridge is fully inserted.
Starts the tape running.
Lights to
indicate that tape is play-
ing
on line.
When the tape is running a momentary
lighting indicates the playback of a
SEC-Cue Tone.
When the tape is running, a momentary
lighting indicates the playback of a
TER-Cue Tone.
Normal run position. Switches unit
from a Run mode to Fast Forward mode.
Sets up system for Record mode.
Lights to indicate that system is in
the
Record mode. Switches VU meters
from Playback output to Record
Amplifier Input.
Controls output levels of channel A
(channel
B, stereo) record amplifiers.
Amplifier output level is indicated
on adjacent VU meter,
Inserts a 150 Hz cue on the cue track
of the tape either during playback or
record
mode. SEC-cue is used to start
external equipment, or to indicate
the end of program.
Inserts an 8 kHz cue on the cue track
of the tape either during playback or
record
mode.

3-1. PLAYBACK
Turn the POWER switch to ON to activate ac power. Insert a
prerecorded
cartridge in the deck opening to the extreme right hand side.
The STOP switch indicator will illuminate to indicate the unit is in the
ready
mode. The 3100 models accept NAB A size cartridges. The 3200
models accept both NAB A and B size. The 3300 models accept all three
size cartridges: A, B, and C.
I NIOTIE
THE 3200 AND 3300 MODELS ARE EQUIPPED WITH
A MOVABLE CARTRIDGE GUIDE TO RESTRAIN THE
LEFT HAND SIDE OF THE CARTRIDGE. THIS IS
POSITIONED AT THE FACTORY FOR A SIZE CART-
RIDGES. IF B OR C SIZE CARTRIDGES ARE USED,
THE GUIDE SHOULD BE MOVED TO THE APPROPRIATE
LOCATION.
Put the tape in motion by momentarily depressing the START
switch. The START switch will illuminate and the STOP switch indicator
will go out. The tape runs until it is stopped by the prerecorded stop
cue signal. The TER-CUE indicator will momentarily light when a TER-CUE
signal passes the playback head and the SEC-CUE indicator will light
momentarily when the first SEC-CUE signal passes the playback head. The
VU meter on record models will indicate the playback audio level.
I NIOU I
THE PLAYBACK MAY BE STOPPED BY PRESSING THE
STOP SWITCH BUT THE TAPE WILL NOT BE PROPERLY
CUED FOR LATER PLAYBACK.
Once the unit is stopped the cartridge may be removed simply
by pulling out.
3-2.
RECORDING
Turn the Power switch to ON to activate ac power. Insert an
erased cartridge in the deck opening to the extreme right hand side.
The STOP switch indicator will illuminate to indicate the unit is in
the ready
mode.
To start the recording process, depress the RECORD switch.
The RECORD indicator will light.
NIOTIE I
AVOID RECORDING OVER THE SPLICE, AS AUDIO
WILL "DROP-OUT" OR "BUMP" ON MOST SPLICES.
10

Adjust the front panel level
dicates a maximum 0 VU (100) on peaks.
indicates the input to the recorder.)
control so that the VU meter in-
(In the record
mode, the meter
The tape is started by momentarily depressing the START switch.
The START switch illuminates and a STOP cue signal is automatically re-
corded on the cue track of the tape.
the tape.
length of
The tape will automatically stop at the STOP cue recorded on
The message length must be carefully timed in relation to
tape
on the cartridge used to avoid overlap.
While recording, the quality can be checked if prov1s1on is
made to feed the audio output to a separate monitor system such as an
audition channel of a console. The program material can be "A - B"
switched by monitoring alternately the input and the output (which is the
reproduction of the audio
just recorded). With monitor systems of equal
quality and equal volume, no difference should be detected in the signal
before recordinq
and after.
3-3. OPTIONAL AUXILIARY CUE TONES (Q-TRIPS)
In addition to the standard, 1,000 Hz stop (primary) cue tone,
all models of the Series 3000 are available with additional frequency
tones.
These optional auxiliary cue tones are used to control other
devices associated with the cartridge machine.
I Non I
THE AUXILIARY CUE TONES MAY BE RECORDED
WHENEVER TAPE IS IN MOTION IN EITHER
PLAYBACK OR RECORD.
The 150 Hz (QI) secondary tone is defined GY the NAB cartridge
standards as the "end of message" cue and is generally used to activate
another device at the end of a recorded segment. This could be, for
example, a sequence cue to an automation system. Similarly, it could be
used to automatically start another cartridge machine. In Series 3000
units so equipped, this tone is used to initiate automatic fast forward
cueing
after a cartridge has played.
The 8 kHz (QII) tertiary tone is defined as an auxiliary tone
to
be used as needed. Generally, it is used to activate another device
during reproduction of a recorded segment.
For example, this tone can ini-
tiate slide changes during recorded commentary. Or it might provide a
warning signal
that a cartridge is nearing the end (a popular use in radio
stations using music on cartridges in place of records). In playback,
auxiliary tones close normally open relay contacts available on the rear
panel remote control connector. At the same time the indicator lamp on the
front panel is illuminated to visually indicate tone presence. The relay
contacts remain closed and the indicator remains illuminated for the dura-
tion of the tone as recorded
on the cartridge. When so equipped, the fast
forward cueing begins at the end of the 150 Hz tone.
11

Equipped record models can both playback and record the auxiliary
cue tones. The tones are recorded by pressing the appropriate front panel
switch
(SEC 150Hz or TER 8 kHz). As long as the switch is depressed, the
tone will
be recorded on the cartridge. To insure positive operation in
playback, NAB standards call for a minimum burst of 100 (at 150 Hz) or 2 (at
8 kHz) milliseconds duration. The exact positioning of the tone and its
duration depends upon the requirements in the individual installation. When
recording the 150 Hz (QI) tone to provide automatic fast forward, the tone
must not end before the program material ends.
3-4.
DELAY OPTION
To provide the delay function, an erase/record head is physically
substituted in place of the record head. The positions of the reproduct and
record heads are transposed. As the program material is recorded, the tape
passes through the
cartridge, and is played back by the reproduce head.
Hence, the reproduced output lags behind the input
by the length of the tape
in the
cartridge used.
Since precise timing is usually desirable, the following table
lists various lengths of seconds and the equivalent lengths in inches of
tape
at 7.5 ips (for 3.75 ips divide the inches equivalent by 2). Allow an
additional 2 to 3 inches for the splice. Make the splice as clean as possible.
Any gap or overlapping in the splice will be noticed as the splice passes
over the reproduce head.
SECONDS
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
INCHES
37.5
45.0
52.5
60.0
67.5
75.0
82.5
90.0
97.5
105.0
112.5
120.0
127.5
135.0
142.5
150.0
Tape tension is particularly critical in short delay cartridges.
Tension must be great enough so that the hub in the cartridge turns as the
tape
moves, but tension must not be too great. Before making the splice,
check the tension. The tape loop can be tightened by gently pulling on the
end where the tape enters the hub. Gently pull tape out of the center to
loosen the tape wrap.
It is a good idea to check delay cartridges frequently.
cartridge (particularly in short lengths) wears rapidly, since the
runs continuously
rather than intermittently.
12
A delay
tape

SECTION IV
THEORY OF OPERATION
4-1. PLAYBACK/LOGIC BOARD CIRCUIT DESCRIPTION
4-2. CONFIGURATION
The Playback/Logic board contains the playback amplifiers for the
program tracks, the output audio muting, the cue track amplifier, the 1 kHz
stop cue sensor, and the stop/start logic. When the optional Q Trips are
installed, the Q1 150 Hz and Q11 8 kHz sensors are incorporated on this
board. Additionally, the 3kHz stop cue sensor required for units equipped
with the
fast forward option is mounted on this board.
In all, there are eight possible configurations of the Playback/
Logic board as shown in the assembly diagram in Section VI. The exact con-
figuration used in a particular machine is indicated in Table 3-1. This varies
depending upon whether a unit is monophonic or stereophonic, equipped with
Q
Trips, or equipped for single speed, manual or automatic fast forward.
The schematic diagram in Section VI shows the most complex arrangement re-
quired for a stereophonic machine with all options.
4-3.
PROGRAM CIRCUITRY
The program tracks of the playback head are coupled through Cll
(C17) to the input of the preamplifier IC-1A (IC-1B). This dual integrated
circuit amplifier provides gain and equalization as determined by the net-
work Rl (R3), R2 (R4), RIO (Rll), R34 (R33), Cl (C4). The variable high
and low frequency trimmers permit adjusting the equalization to match in-
dividual heads to NAB or other standards (IEC. CCIR, etc.). Internal de
voltage is supplied to both halves of IC-1 through pin 14 from the decou-
pling network
R26, C13. Bias de is provided from the voltage divider R20,
R25,
C12 through R19, R24.
The output of the preamplifier is coupled through C26 (C25) to
the
FET program muting switch Q5 (Q6). This Nchannel device is controlled
by the logic so that a ground on either CR7 or CR8 shuts off the audio
signal. This is provided whenever the machine is in the stop mode or when
units equipped for automatic fast forward are so operating. Bias (12 VDC)
for the FET is provided from the voltage divider R35, R98, C24 through R36,
R37, (R38), R39, (R48). Filtering is provided by C23 which shunts to ground
any ac appearing on the gate.
The output of the FET is coupled through C27 (C28) to the output
level control
R15 (R16) mounted on the playback board. The audio signal is
also available through board pin 14 (13) for the VU meter installed in
record/playback models.
13

Signal from the level control is coupled through C30 (C31) to
the output booster IC-3. This dual
amplifier and the complementary symmetry
drivers Q4, Q3 (Q1, Q2) provide 28 dB gain to drive the output to a maximum
+18 dBm. This gain is determined by R42 (R47), R41 (R46). DC bias for Q3,
Q4 (Q1, Q2) is provided by CR4, CR5, CR6 (CR1, CR2, CR3). Bias for IC-3 is
supplied from the divider R16, R17, C10 through R40, R49 and internal voltage
directly from the +24 VDC.
The fully amplified signal is coupled through C22 (C21) to the
primary of the output transformer
and the headphone jack. (The transf0rmer
adds 6 dB of gain to the output signal which then appears at the output
connector).
4-4.
CUE TRACK AUDIO AND ONE KILOHERTZ STOP SENSOR
The cue track of the playback head is coupled through C15 to the
input of
IC-2A which acts as a preamplifier with gain and equalization com-
parable to the program preamplifiers as provided by R21, R22, R23 and C14.
Bias for IC-2A is supplied through R15 from voltage divider R17 and R16.
The output of the preamplifier is direct coupled to the booster
IC-2B. Inverting amplifier IC-2B provides 27 dB of gain as determined by
R27 and R28. The amplified signal is coupled through C20 to the cue output
(on the rear panel remote control connector) through pin 19 and to the 1 kHz
sensor level control (R8).
The signal is coupled through C43 to a fixed tuned twin-T filter
composed of IC-4A, R84, R85, R86, C44, C45 and C46. The 1 kHz output of the
filter is ac coupled to half wave rectifier CR21, CR22. Capacitor C58 and
resistor R97 provide filtering. The FET Q10 is connected to ground the
signal to
disable the sensor. In the stop mode, the gate of Q10 grounds to
the
stop/start logic through CR15 and R100 to turn on Q10. When the ground
is removed as the logic changes to the run mode, C55 keeps Q10 in conduction
(and the sensor muted) for approximately three seconds. Similarly, the gate
of
Q10 can ground through R95 and CR17 to the fast forward cue shift/mute
bus. Removing this ground activates the sensor immediately.
The de signal from R75 is connected to comparator IC-6D. When
this voltage exceeds the reference from R57, R99, connected through R72,
the output of IC-6D goes to +VDC to deliver a pulse through C39 to the stop
control.
4-5. OPTIONAL THREE KILOHERTZ STOP SENSOR
In units equipped for operation at both the normal and fast for-
ward (3X normal) speeds, a 3kHz stop sensor is also installed. Signal is
taken from the 1 kHz level control (R8) to FET Q7. In this case the sensor
is active only when the FET is conducting. This is accomplished by ground-
ing the
fast forward cue shift/mute bus.
The mute is gradually removed as C34 discharges through R55.
Even if the tape is not up to full 3X normal speed, a stop tone can be
sensed, since the normal 1 kHz sensor is slowly turning off as the 3 kHz
sensor is turned on. When the ground is removed, Q7 immediately shuts off
to disable the 3 kHz sensor.
14

Following Q7 the audio signal is fed to LC filter L1, C41, and
to IC-48 for amplification. The output is rectified, filtered, and fed to
comparator IC-68.
With 3 kHz tone present at the filter, the output of
IC-68 goes high to deliver a positive pulse through CR13 and C39 to the
stop
control.
4-6. OPTIONAL Q-TRIP SENSORS
When equipped with the optional QI 150Hz and QII 8kHz auxiliary
cue tones, separate sensors are installed. These are similar in operation
to the 1
kHz sensor. Signal is taken from the output of the cue track
booster
amplifier (IC-28) through separate level controls to a fixed tuned
active filter. The signal is then rectified and fed to a comparator which
delivers a +VDC output during tone presence to drive relays located on the
power supply. To prevent chatter by these relays when the ac power is turned
on,
C36 keeps the reference voltage higher than normal until the circuit
stabilizes. At turn-off, C61 and CR24 hold the reference voltage as the
power supply shuts down. Muting is accomplished by grounding the input to
the comparator
by the fast forward cue shift/mute bus. The 150 Hz (01) tone
is sensed by IC-58, IC-6A while the 8kHz (011) tone is sensed by IC-5A and
IC-6C.
4-7. STOP/START LOGIC
Stopping and starting are controlled by the flip-flop composed of
Q8 and Q9. The circuit is a bistable multi-vibrator in which Q9 is con-
ducting
and Q8 is off, or Q8 is conducting and Q9 is off. When Q8 is off
the collector is not drawing current and is at a 18 VDC level. This voltage
is carried through R52 to the base of Q9 to hold Q9 in full conduction.
Likewise,
when Q9 is off, the voltage from its collector goes to the base of
Q8 through R53 to hold Q8 in full conduction. The flip-flop will change
state when a positive voltage is applied to the base of the non-conducting
transistor. This is accomplished through coupling resistors R61 and R61.
To prevent false triggering, capacitors C60 and C33 shunt short duration
transient pulses to ground. When power is first applied, R54 ensures that
the flip-flop will set to stop with Q9 conducting. The output voltages from
Q8 and Q9 are available on the board pins M and 9 for use in the logic on
the power supply and record boards.
4-8.
POWER SUPPLY BOARD
4-9. CONFIGURATION
The Power Supply board contains the +24 VDC supply for the elec-
tronics, the +30 VDC supply and controlling circuitry for the solenoid, and
the logic driver circuits. In units equipped with the optional Q-Trips,
the
QI 150 Hz and QII 8 kHz relays are mounted here. In units equipped with
the optional
fast forward provision, the motor control circuitry is incor-
porated
on the Power Supply. The Power Supply is manufactured in four
versions.
The schematic diagram included shows the most complex configur-
ation in which the Q-Trip and fast forward options are both included. The
assembly diagram with parts lists is also included.
15