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6.0 MAINTENANCE AND ALIGNMENT
This chapter contains sections describing routine maintenance, troubleshooting, the installation and
servicing tool kit, the spare parts kit, and replacement parts for the BMX III console.
6.1 ROUTINE MAINTENANCE
Routine maintenance is usually limited to checking button switches for proper operation and keeping
panel surfaces clean. The panel surfaces are finished with a baked polyurethane paint and may be
cleaned with a weak solution of dishwashing detergent. The procedures for checking power supply
voltages, lamp replacement, button replacement, and collet knob removal are described below.
NOTE: The Penny & Giles faders used in BMX III input modules (PR&E #24-115 for Stereo Line Input
Modules and PR&E #24-116 for Microphone Input Modules) are not field serviceable.
6.1.1 Checking Power Supply Voltages
The BMX III power supply is designed to provide very low noise power to the console. Banana jacks
are provided on the front panel of the power supply for checking power supply voltages. Each output
should be within 0.5 volts of its specified DC voltage. The outputs should also be checked periodically
for ripple and noise using a sensitive AC voltmeter. The reading should be less than 350 microvolts
RMS.
6.1.2 Lamp Replacement
NOTE: When replacing a lamp, replace it with an identical type. Do not substitute lamps of different
voltage or current ratings.
Meter lamp replacement is accomplished by squeezing the mounting ears on the lamp socket to remove
the socket from the rear of the lamp bracket assembly. Replace the wedge based lamp with PR&E #12–
22, and reinstall the socket into the lamp bracket assembly.
Module ON and OFF lenses are removed by hand by lifting them straight up out of the switch housing,
and are unique in that they unseat and withdraw the lamp with them. Install the wedge based
replacement lamp (PR&E #12-20) into the socket in the switch housing, and reinstall the lens.
Talkback, Return ON, and timer and machine remote control panel switches are EAO series 31, and
the procedure for lamp replacement is as follows:
1.
Remove the lens by using the tong-shaped EAO Lens Removal Tool (PR&E #70-40) to
grasp the top and bottom of the lens and pull it straight out of the button housing.
NOTE: Failure to use this tool will probably result in damage to the lens' molded retaining
notches.
PACIFIC RESEARCH & ENGINEERING
98
BMX SERIES III CONSOLE
REVISION C
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