protech 51003 User manual

Protech Audio Corporation 192 Cedar River Road, Indian Lake, New York 12842 Voice 18-648-6410 Fax [phone]
PROTECH ®INSTALLATION & OPERATION MANUAL
MODEL 51003
AUDIO MIXING SYSTEM
The Model 51003 Audio Mixing System is designed for
smaller installations, th at e xpe ct to e xpa nd i n t he near
future. The 51003 incorporates most features that are
required in a professional installation. The unit includes the
follo ing features;
Microphone and/or line level inputs, all transformer isolated.
Phantom po er capability selectable for each input.
Selectable gain structures on each input (4 settings).
Lo -cut filters, selectable on each input.
Priority setting for channel 1, ith automatic override, or,
hard ired to external s itch for muting channels 2 thru
AUX.
Adjustable mix level for each input, including AUX.
AUX input hard ired on rear terminal, ith front panel jack
to bypass rear input and allo access to mixing buss.
Mixing buss link capability, to allo additional inputs.
Effects send/receive link.
Bass & Treble Controls, ith s itch selectable defeat mode.
Limiter, ith s itch selectable defeat mode.
T o transformer isolated outputs, ith s itch selectable
remote control of output t o.
Metering of outputs A/B, ith adjustable meter trim
Built-in oscillator to allo quick set-up
In addition to the many features already listed, the Model
51003 is designed to allo the entire PC assembly to unplug
from the front of the chassis to facilitate quick changeovers.
And the UL approved all mount transformer helps the unit
to provide superior specifications.
The architectural design of the Model 51003 is to allo the unit
to serve as the heart of a small audio system, and still not
become obsolete hen the designer ishes to add additional
equipment to the system. For instance, the defeat s itches
on both the tone controls, and the limiter, ill allo
future addition of an equalizer and/or compressor/
limiter. The defeat s itches are activated, and the effects
send is used to introduce these additional pieces of
equipment into the system, ithout loosing the main
mixing and distributing features of the Model 51003.
The input section has a large number of user definable
features, in order to accomodate the variety of requirements
that may come up in a small installation, such as a House-
of-Worship. The electronics may be unplugged from the
front, and re-configured in a matter of moments, to allo
multiple uses of the sound system.
The built-in oscillator, and the LED bargraph metering
of both outputs, helps make the realignment process, after
changeover, as easy as possible. By making use of these
features, the audio engineer can make pr ecise and
repeatable alignments in a matter of minutes.
This installation and operation manual is designed to
help the user become acquainted it h t he many features
of the Model 51003, and ho best to make use of them.
The Model 51003 Audio Mixing System is a perfect
companion to other Protech Audio products, suc h as the
Model 5117T Audio Distribution Amplifier, or the Model
65302B Ambient Sensing Level Control.
PHOTOGRAPH
1/06
www.protechaudio.com

TABLE OF CONTENTS
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Table of Contents.
Block Diagram.
Input & Output Section, Standard Setup and Wiring.
Input & Output Section Mechanical Drawing.
Using Special Features, Setup.
Using Special Features, Setup.
Using Special Features, Setup.
Setup, As Shipped
Specifications.
Schematic, Input Section.
Schematic, Auxillary Input Section.
Schematic, Priority Circuit.
Schematic, Summing Amplifier.
Schematic, Limiter Circuit.
Schematic, Output Section.
Schematic, Tone Control Circuit.
Schematic, Oscillator Circuit.
Schematic, LED Display Circuit.
Schematic, Power Supply Circuit.

Phantom
Power
Mic/Line Cut/Flat
Phantom
Power
Mic/Line Cut/Flat
Phantom
Power
Mic/Line Cut/Flat
Phantom
Power
Mic/Line Cut/Flat
Phantom
Power
Mic/Line Cut/Flat
Phantom
Power
Mic/Line Cut/Flat
1 KHz Tone Oscillator
Effects
In/Out
Buffer
Summing Amplifier Buffer
Treble
Bass
EQ
Limiter
VCA
Automatic
Mute
AUX Input
Front
Panel
Jack
Input
6
Input
4
Input
5
Input
2
Input
1
Input
3
Mix Buss
In/Out
EQ Defeat
Switch
Limiter Defeat
Switch
BST.
Master Channel A
Output
Drive Amp
Channel B
Output
Drive Amp
Channel A
Output
Channel B
Output
Front Panel
Control Trim
LED
Meter
CH. A
CH. B
Mute
Circuit
Gain Select Input
Level
External Mute Switch
Channel
4 Position
DIP Switch
Channel
Slide
Switch
Model 51003 Audio Mixer Block Diagram
Protech Audio Corporation
Remote
Control

INPUT SECTION OUTPUT SECTION
The Model 51003 Audio Mixing System is designed to mount in a standard 19" ide EIA rack. Each unit requires 1.75" of ver- tical rack space. Care should be taken not to mount the unit next to po er supplies, po er amplifiers, or other equipment hich gen- erate strong AC fields. The steps for install- ing the unit are as follo s;
After input and output section have been configured, proceed ith installation of unit in rack. Slide PC assembly back into chassis until fully seated in mating connectors (front panel should be flush ith mounting brackets). Mount unit in rack, using four machine scre s of sufficient tensile strength to sup- port unit properly. Terminate all audio inputs and outputs, using double conduc- tor shielded cable, as sho n belo and in output section.
This concludes the configuration options for the input section. Refer to the output section on this page, for output configuration options.
With unit firmly on orkbench, loosen t o thumbscre s located on each end of front panel, and slide PC assembly out of chassis. Check that ground lift s itch (#1) is in the on position. Slide Mic/Line selector s itches (#2) to the desired positions. Slide DIP s itch (#3) position A to on position for each input needing Phantom Po er. Slide DIP s itch (#3) position D to off position for each input not needing
LOW-CUT filter. If required, slide DIP s itch (#3) posi- tions to off position for reduced gain on each channel (see chart on page 5). If required, slide priority s itch (#4) to IN position to activate automatic priority feature.
1- 2- 3- 4- 5- 6- 7-
INPUT SECTION CONFIGURATION
This concludes the connections for the input section. Refer to the output section on this page, for output connection informa- tion.
UNBALANCED INPUT CONNECTION
BALANCED INPUT CONNECTION
AUXILLARY INPUT CONNECTION
SH
HI
HI
LO
SH
HI
LO
SH
The follo ing configuration and installation steps should be done only after the input section has been configured. The steps are as follo s;
OUTPUT SECTION CONFIGURATION
1 - 2 - 3 - 4 - 5 - 6 -
With unit firmly on orkbench, loosen the t o thumbscre s on each end of front panel, and slide PC assembly out of chassis. If necessary, slide the LOC/RMT s itch (#5) to RMT position to allo remote control of the Channel B output level. If necessary, slide the EQ s itch (#6) to the OUT position to bypass the tone control section. If necessary, slide the LIM s itch (#7) to the OUT position to bypass the lim- iter section. Turn OUTPUT control knobs (#8) fully counterclock ise. Check to confirm that the TONE s itch (#9) is in the OFF position.
This concludes the configuration options for the output section. Refer to the input section for input configuration options.
After input and output section have been configured, proceed ith installation of unit in rack. Slide PC assembly back into chassis until fully seated in mating connectors ( front panel should be flush ith mounting brack- ets). Mount unit in rack, using four machine scre s of sufficient tensile strength to support unit properly. Terminate all audio inputs and outputs, us- ing double conductor shielded cable, as sho n belo , and in input section.
This concludes the connections for the Model 51003.
SH
LO
HI
SH
LO
HI
BALANCED OUTPUT CONNECTION
UNBALANCED OUTPUT CONNECTION
Plug all mount transformer DIN connector into AC connector on rear of chassis. Plug all mount transformer into AC receptacle.
20 VAC
SWITCH POSITION
GROUND LIFT................................................................ON
MIC. / LINE SWITCH.......................................................MIC
PRIORITY (INPUT #1).....................................................OFF (MANUAL REMOTE)
EQ SWITCH ...................................................................IN
COMPRESSOR................................................................OUT
OUTPUT (B) RMT./LOC...................................................LOCAL
4 POS. DIP SWITCH
A = PHANTOM POWER................................................OFF
B = GAIN 1.....................................................................ON
C = GAIN 2.....................................................................ON
D = BYPASS, L/F ROLL OFF.........................................ON
LED DISPLAY.................................................................0 VU = 0dBv OUTPUT
51003 MIXER
HOW YOUR MIXER
WAS CONFIGURED
AND SHIPPED

Page 8 9/94
SPECIAL FEATURE SECTION
FEATURE SETUP
PRIORITY INPUT ON CHANNEL 1
AUXILLARY INPUT
The auxillary input is ired thru the rear barrier terminal, and is normalled thru the front panel phone jack.
Plugging a phone plug into the front panel jack disconnects the rear terminal auxillary input. It also allo s
audio on the phone plug to enter the mix buss thru the front panel AUX pot.
Wiring for the front panel jack is as follo s;
TO AUX LEVEL CONTROL
FROM REAR BARRIER INPUT
The priority feature on channel 1 disconnects all other inputs from the summing buss, ith the exception of
the summing buss link on the rear barrier. The priority feature may be used in one of t o modes;
Automatic = any audio applied to the #1 input ill automatically activate the priority feature,
Manual = a closure applied to the rear barrier terminal ill activate the feature.
To use the automatic function, loosen the t o thumbscre s and remove the electronic section from the
chassis.
Slide thepriority s itch (see pc layout dra ing) to the ON position.
Slide electronic section back into chassis, making sure pc board is seated properly in mating connectors, and
tighten thumbscre s.
To use the manual mode, apply a closure to the rear barrier terminal as sho n belo .
LO HI SH LO HI
A
BOUTPUTS
HI ARM LO
RMT SUM AFX MUTE AUX
IN
OUT SH IN OUT SW IN HI SH
REMOTE
CLOSURE
OUTPUT TRANSFORMERS
MIC / LINE SWITCHES
INPUT SELECT SWITCHES
RMT
LOC
EQ
LIM
LIMITER ADJUST
PRIORITY
OFF
GND ON
ON
IN
D
C
B
A
AUX JACK
POWER
ON/OFF
LED
INPUT LEVEL CONTROLS
1 2 3 4 5 6 7 BASS TREBLE B
A
MASTER OSC
TRIM
METER A/B
METER
ON OFF
MIC
LINE
MIC MIC MIC MIC MIC
LINE LINE LINE LINELINE
OFF ON OFF ON
35dB 57dB 50dB 60dB
B C Gain
OFF OFF ON ON
MIC
LEVEL OFF
ON OFF ON
0dB 20dB 15dB 25dB
B C Gain
OFF OFF ON ON
LINE
LEVEL
B = GAIN SELECT
D = BYPASS, L/F ROLL OFF
C = GAIN SELECT
A = PHANTOM POWER
DIP SWITCH LEGEND:
#1
#2
#3 #4 #6
#5
#7
#9
#8
ON
GND LIFT
OUT
OFF
DIST. ADJUST

Page 6 9/94
SPECIAL FEATURE SECTION
FEATURE SETUP
REMOTE CONTROL OF CHANNEL B OUTPUT LEVEL
USING THE INTERNAL OSCILLATOR FOR SETUP.
Turn all input pots completely counterclock ise.
Turn both output pots completely counterclock ise.
Set meter select s itch to output A.
Depress oscillator s itch to turn on oscillator.
Slo ly turn output A pot clock ise until a OdB reading is attained on the meter.
Set meter select s itch to output B.
Slo ly turn output B pot clock ise until a 0dB reading is attained on the meter.
Depress oscillator s itch to turn off oscillator.
The output gain sections are no set for unity gain, and the input pots may be used to set individual
input channel gain settings.
Loosen t o thumbscre s on either side of front panel, and remove electronic assembly from front of
chassis.
Slide LOC/RMT s itch to RMT position (See PC Output Layout Dra ing).
Slide electronic section back into chassis, making sure pc assembly is properly seated in mating connec-
tors.
Tighten t o thumbscre s.
Wire external pot (10K Ohms minimum) to rear barrier terminals as sho n belo .
LO HI SH LO HI
A
BOUTPUTS
HI ARM LO
RMT SUM AFX MUTE AUX
IN
OUT SH IN OUT SW IN
HI SH
Page 7 9/94
SPECIAL FEATURE SECTION
FEATURE SETUP
EFFECTS IN/OUT
MIX BUSS IN/OUT
Remove jumper from barrier terminal.
Wire effects unit to barrier terminal as sho n.
LO HI SH LO HI
A
BOUTPUTS
HI ARM LO
RMT SUM AFX MUTE AUX
IN
OUT SH IN OUT SW IN
HI SH
IN FROM EFFECTS UNIT OUTPUT OUT TO EFFECTS UNIT INPUT
The summing buss link allo s access to the summing buss thru a 10K resistor. This allo s the link to
function as either an input, or an output, hen used ith unbalanced line level signals.
LO HI SH LO HI
A
BOUTPUTS
HI ARM LO
RMT SUM AFX MUTE AUX
IN
OUT SH IN OUT SW IN
HI SH
SUMMING BUSS ACCESS, IN OR OUT