Description - Shure Pro Master 700 Service Manual

Model 700
The Shure PRO MASTERTM Power Consoles are port-
able, high-power, eight-input mixer-amplifiers designed for
use by professional entertainers and sound system oper-
ators. They are all solid-state units, employing the latest
developments in integrated circuit, discrete component,
and printed wiring technology. The PRO MASTER features
pre-fader monitor, and exclusive FEEDBACK FINDERTM
and PATCH BLOCKTM rear panel. Models 700 and 700E6
are stereo units, with twin 200-watt (rms) power amps, and
Models 706 and 706E6 are mono units, with a single 200-
watt (rms) power amp.
Six input channels for microphones andlor aux level
sources provide six high-impedance and six balanced
low-impedance inputs (which can be used simultaneously).
Each input channel is equipped with volume, 0-30 dB atten-
uator, high- and low-frequency equalization, effectdreverb
and monitor controls. Two additional aux (only) input chan-
nels (7 and 8) with volume controls are also provided.
Models 700 and 700E6 also contain A I B PAN controls.
LED indicators show input clipping, power amp peak
output level, power amp overload, power-on, temperature
warning, and shutdown conditions.
Master controls include: master volume, effects send,
reverb high- and low-frequency equalization, reverb return
and monitor. Console outputs are: monitor, effects, stereo
headphones, aux, mic, and speakers. In addition, common
mix buses are provided: mix output and equalizer output.
Each 10-band graphic equalizer uses minimum-phase,
combining-type octave filters. Each filter is continuously
adjustable over a 213 dB range, except for the lowest,
which is a 12 dB1octave cut-only switch. The FEEDBACK

DESCRIPTION

FINDER circuit switches the LEDs from power amp peak
output level indicators to visual indicators of feedback
frequency for eliminating feedback by graphic equalizer
adjustment.
The built-in electromechanical spring-type reverbera-
tion device has provisions for connecting an external re-
verb onloff switch through the rear panel.
The rear-panel PATCH BLOCK contains a block diagram
of the console's circuits, with patching jacks located in the
diagram for easy reference.
The Model 700 and 706 consoles' regulated low-voltage
power supplies operate over a 120 Vac
ation as low as 100 Vac is possible at reduced output). The
consoles can be rewired internally for operation at other
voltages (see OPERATION AT OTHER VOLTAGES). An
unswitched ac receptacle for powering accessory equip-
ment up to 100 watts is supplied. The Models 700E6 and
706E6 operate at switch-selected voltages of 100, 120, 140,
200, 220 and 240 volts. Irf all models, a regulated 24 Vdc
simplex supply is provided for powering condenser micro-
phones. The consoles are protected against damage from
open- or short-circuits on inputs or outputs, against heat
damage by a cooling fan and automatic thermal shutdown
circuit, and against radio frequency interference and line
noise.
The structural foam molded cover is fastened to a
19 mm (% in.) wood bottom panel and contains a retrac-
tile handle, rubber molded feet, and line cord storage.
Models 700 and 706 are Listed by Underwriters' Labora-
tories, Inc., and listed by Canadian Standards Association
as Certified.
Model 706
*
10% range (oper-