Service manual

ARS Analog Series User and Service Manual P/N 821518 Rev-B

Mounting

The ARS unit should be mounted in a rack or console where convenient for the expected level of operation. If only

occasional operation is expected, the unit might be located higher or lower in the rack than would be advisable if

it is expected to be used frequently. The unit's chassis is only six inches deep, so it may be more convenient to connect

the cables from in front of the rack. This would be especially useful where the ARS unit is adjacent to equipment

with a fairly deep chassis. In that case, when attaching the plug-in terminal blocks, be sure that the cables are long

enough to reach through the front of the rack.

Heat Dissipation

Heat produced by these units is negligible. No special considerations for cooling are necessary as long as the

ambient temperature inside the rack area does not exceed approximately 40°C (104°F).

Mechanical Bracing

The chassis is securely attached to the front panel at six points along its surface, not just at the four corners of the

chassis ears. This feature will reduce or eliminate rear bracing requirements in most mobile/portable applica-

tions. The weight of internal components is distributed fairly evenly around the unit.

Electrical Interference

As with any audio equipment, maximum immunity from electrical interference requires the use of shielded cable;

however, satisfactory results can sometimes be obtained without it.

Power Supply

The ARS Series is powered by an external Universal Input/24VDC desktop power supply through a DC input

connector at the rear panel. Since the opamp circuitry normally requires a split supply, a bias source is created at

1/2 the 24VDC level for proper opamp biasing.

Audio Connections

All input connections are on "Phoenix" style, screw clamp, plug-in terminal block connectors. Each input channel

is on a separate plug-in terminal block. For connection to a single-ended (unbalanced) source, the unused input

terminal must be jumpered to circuit common, which is easily done on the plug-in terminal block.

Output connectors are male XLR with three or five pins, or female DIN with 8 pins depending on the model. See

page 20, in the Technical Information section for pin-out information for all models.

Installation

Section 2: Operation