7
Lexicon NT Series Amplifiers
Bridged Operation
The pin outs on the DC-1 have appropriate signals available via the rear panel
DIN connectors. Pin 1 is ground and Pin 3 is +5V. (On some models, Pin 3 may
be +12V, depending on an internal jumper configuration, but either 5V or 12V
will work.)
All of the Lexicon amplifiers, with the exception of the 501, which is single-
channel, can be bridged, doubling the normal output voltage. Please refer to the
rear panel diagram for each model for specific wiring information. Note that
only the red colored output connectors are used in bridged operation. To ensure
consistent polarity, note the + and – markings on the bridged operation wiring
diagram on the amplifier rear panel.
No sound
Check setting of the input connector type (BAL/
UNBAL) and operation mode (BRIDGED/INDI-
VIDUAL).
Check the speaker cable wiring on the rear panel and
verify correct configuration for individual or bridged
operation.
Use another amplifier channel to verify that the input
signal is good. Use another speaker to verify that the
speaker is not faulty.
No LEDs
Check the power cord connection.
Disconnect power cord from amplifier, and check rear
panel fuses.
Check front panel power switch is ON.
Turn Remote ON/OFF switch to LOCAL. If amplifier
turns on, check voltage of the trigger signal at the input.
It must be at least 3.8 volts.
LEDs continuously
red or yellow
Check input and output cables for short circuits. If
LEDs remain red or yellow, disconnect the power and
contact Lexicon Customer Service at (617) 736-0300, or
your local dealer.
Your Lexicon amplifier requires no maintenance. It is, however, good electrical
practice to clean all connectors once a year. An occasional dusting of the exterior
surface with a soft cloth helps maintain the unit’s luster. Do not use any abrasive
chemicals or cleaners as this will damage the surface.
Troubleshooting
Maintenance
