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Model SD135
Remote Turn-on Connections
The SD135 has a built-in 12VDC remote turn-on/off circuit
for operation by a master control system in a home theater
or large audio system. Use a 3.5mm (.140") diameter mono
mini plug to connect to the +12V IN jack on the rear of the
SD135. Two identical paralleled jacks are provided to
allow chaining connections to control two or more SD135s
or other equipment.
The +12V IN jack should be connected to the +12VDC
output of the master control system, using a continuous
+12VDC signal at 20mA per SD135 for the duration of
amplifier on-time. Do not use a momentary or data pulse
control signal.
The front power rocker switch on the SD135 must be off to
use the remote turn-on. The front power rocker switch may
still be used when the remote turn-on is connected, but the
remote will not turn the SD135 off if the front power rock-
er switch is left on. The front power rocker switch will not
turn the SD135 off if the remote system is on.
The +12VDC remote jacks have polarity protection, so they
will not operate if a -12VDC signal is accidentally connect-
ed, or if the control wires are reversed. The 12V remote
relay in the SD135 has click suppression to protect circuits
in the master control system.
Operating Procedure
1. Make sure you have read and followed the INSTALLA-
TION and CONNECTIONS instructions prior to
attempting operation.
2. Make sure the amplifier is properly connected to a high-
current AC power receptacle via the supplied power cord
(see CONNECTIONS).
3. Your preamplifier should be "On" and muted and/or set
at minimum gain.
4. Turn Power switch from "Off " to "On". Unit is ready to
play when green LED is on. Note: if the power indicator
LED fails to light, turn the Power switch to "Off " and
check the appropriate fuse for possible failure. Extra
fuses for AC power are included with the unit.
5. Your amplifier should now operate satisfactorily. It may
be played immediately, although best sonic performance
will in most cases not be achieved for an hour or so.
Start-Up Following "Protect" Shutdown
The SD135 amplifier uses a sophisticated, non-fused
sensing circuit to protect the amplifier from D C at the
output. This circuit also helps prevent damage to your
loudspeakers.
When the amplifier senses a fault condition in either chan-
nel from excessive D C it will automatically shut off left and
right outputs from the amplifier, and indicate this condi-
tion by extinguishing the green power LED and the yellow
LED will be "on". When the fault condition is ended, the
amp will go through the two - second warmup cycle before
resuming normal operation indicated by green LED "on".
If the amplifier fails to resume normal operation after
attempting resetting due to a fault condition, contact your
authorized dealer for further assistance.
Cooling Fans
There are two D.C. cooling fans located at the rear of the
SD135 to maintain proper operating temperature of the
output devices. Do not operate the SD135 with fans
disconnected or if one or both fans should stop running.
Servicing
Because of its careful design and exacting standards of
manufacture, your SD135 amplifier should normally
require only minimal service to maintain its high level
of performance.
C A U T I O N : The SD135 amplifier contains sufficient levels
of voltage and current to be lethal . Do not tamper with a
component or part inside the unit. Even with the power
turned off, a charge remains in the energy storage capaci-
tors for some time. Refer any needed service to your
authorized Audio Research dealer or other qualified
technician.
Additional questions regarding the operation, maintenance
or servicing of your amplifier may be referred to the Cus-
tomer Service Department of Audio Research Corporation
at 763-577-9700 (C ST). When ordering a service manual
from Audio Research or an authorized dealer, be sure to
identify the serial number on your amplifier.
Cleaning
To maintain the new appearance of this unit, occasionally
wipe the front panel and top cover with a soft, damp (not
wet) cloth to remove dust. A mild, non-alkaline soap solu-
tion or dilute isopropyl alcohol may be used to remove
fingerprints or similar smudges. Cleaners containing abra-
sives should not be used as they will damage the anodized
finish of the front panel. A small, soft paint brush is effec-
tive in removing dust from bevels, the recessed nameplate
and other features of the front panel.
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