Audio Research Reference 210 Manuel du propriétaire télécharger pdf (Page 8)

Remote Turn-on Connections

The Reference 210 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 Reference 210. Two identical paralleled jacks are

provided to allow chaining connections to control two or

more Reference 210s 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 12mA per Reference 210 for the duration

of amplifier on-time. Do not use a momentary or data pulse

control signal.

The front power rocker switch on the Reference 210 must

be off to use the remote turn-on. The front power rocker

switch may still be used when the remote turn-on is con-

nected, but the remote will not turn the Reference 210 off

if the front power rocker switch is left on. The front power

rocker switch will not turn the Reference 210 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 Reference 210 has click suppres-

sion to protect circuits in the master control

system.

Operating Procedure

Start-Up:

1. Secure input connection between the amplifier and your

preamplifier; attach speaker leads to the appropriate

output terminals.

2. Attach supplied power cord to rear IEC inlet of amplifier,

and plug other end into grounded A. C. power receptacle.

3. Turn on preamp and all other components; mute preamp

output.

4. Turn Reference 210 front-panel control from Off to

On; display will show “Low Line” for approximately 3

seconds until power relay engages. A two-minute

mute/warm-up cycle will follow.

5. Select display function desired if other than “Power

Scale.”

6. Unmute preamplifier output, initiate source component

signal, and adjust gain as appropriate.

Shut-Down:

1. Mute preamplifier output.

2. Turn Reference 210 front-panel control from Operate to

Off.

3. Turn off preamplifier and then the associated input

source components.

Bias Adjustment Procedure

1. Amplifier should be turned on and operating for at least

30 minutes before adjusting bias of output tubes.

2. Select bias level function in display screen using the

remote control. The 210 will mute. Display will default

to V1 location, showing bias level and instructions to

adjust bias to 65mA.

3. Using supplied flat-bladed tool, insert into V1 pot open-

ing on front panel and rotate until screen reads 65mA.

4. Using the remote control, switch to V2 location and

repeat adjustment procedure.

5. Check bias level for all other output tubes (V3–V6); each

should measure in the range of 57mA to 73mA. If

a tube persistently measures outside this range, it should

be replaced.

6. Once tubes have been adjusted and checked for bias

level, return display screen to Power Scale function and

amplifier is ready to play.

The Reference 210 is shipped from the factory with all

tubes properly biased and ready to use. It is not necessary

to check bias each time the amplifier is turned on.

Under typical circumstances, most owners will find that

checking the bias level once a month or so will insure prop-

er operation and good service life of the output tubes.

Audio Research-supplied output tubes are warranted for

90 days, and under normal conditions should provide up

to 2000 hours of service life. This expected life will vary

depending on conditions of use–ventilation, speaker loads,

average playing level and A. C. voltage and line condition.

Complete sets of replacement tubes or individual tubes are

available from Audio Research, and are strongly recom-

mended for best sonic performance and reliability. These

tubes are burned in, measured, matched and specifically

selected for your Audio Research amplifier. Contact your

authorized dealer for suggested retail prices.

Cooling Fan

The high-quality 12V D.C. fan is single-speed and is not

adjustable. It operates at a speed selected to provide

adequate cooling of the tubes with a minimum of air

turbulence or noise.

Servicing

Because of its careful design and exacting standards

of manufacture, your Reference 210 amplifier should

normally require only minimal service to maintain its high

level of performance.

Model Reference 110

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Audio Research Reference 210 Manuel du propriétaire Page 8

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