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BMX SERIES III CONSOLE
The console mainframe is supported by the hardwood oak end panels, and is actually suspended between
the two end panels, with the front oak piece serving only as trim molding.
NOTE: Care should be taken to avoid locating the console within six feet of any intense electromag-
netic hum fields such as are produced by large power transformers and motors. Likewise, cables to and
from the console should be routed to achieve maximum practical distance from AC mains power wiring.
Particular attention should be paid to some of the low-cost, supposedly "professional", power amplifiers
which have appeared in the marketplace. In many cases the low cost has been partially achieved through
the use of small core power transformers operating on the edge of saturation. While these units may
operate to their own specifications, the electromagnetic fields they radiate may impair the performance
of the console, neighboring turntables, tape recorders and cartridge machines.
Signal, logic and power connections are made to the connector panel located at the rear of the console.
This panel is recessed to provide the installer flexibility of wire routing in console installation.
The power supply is usually installed in the console support cabinetry using EIA standard rack rails.
Adequate ventilation must be provided for the proper dissipation of heat. The power supply is designed
for convection cooling by the two massive rectifier/regulator heat sinks located on opposite sides of the
chassis. Large heat sinks were chosen over the use of fans to eliminate the problems of dust circulation,
noise, and potential mechanical failure associated with fan cooling.
Install legend strips by sliding them into the tops of the legend panels. Monitor legend strips are 0.6
inch wide by 5.15 inches high (15 mm by 131 mm); Remote Line Selector legend strips are 0.6 inch
wide by 5.7 inches high (15 mm by 145 mm); Meter Switcher legend strips are 0.6 inch wide by 2.8
inches high (15 mm by 71 mm). Vertical switch spacing is 0.6 inch (15 mm).
2.2 CABLE PREPARATION
Before beginning the installation, a plan should be drawn up showing how the system will be
interconnected (use the module pin-out information contained in Section 2.7 as a guide). All cables and
connectors should be tagged with numbers and/or legends, and logged.
Only unspliced (preferably new) cables should be used in connecting the mainframe. Audio
connections should be made with 2-conductor stranded insulated foil shielded cable with drain wire.
The cable used should be equivalent to Belden types 8451, 9451, or 8761.
Strip the cable insulation jacket and foil shield back about 1-1/2 inches, and sleeve the shield drain wire
with heat-shrink tubing, leaving about 3/16 inch of the wire exposed. Then, strip the insulation of each
signal wire back about 3/16 inch, and sleeve the shield (at cable ends) with heat-shrink tubing.
NOTE: It is very important to sleeve the shield drain wire and the shield (at cable ends) with heat-shrink
tubing. This is the only means of assuring an installation according to recommended grounding
procedures.
PACIFIC RESEARCH & ENGINEERING
REVISION C
8
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