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DAX60 60-WATT POWER AMPLIFIER

DAX120 120-WATT POWER AMPLIFIER

INSTALLATION AND SERVICE

KI-1480

RAULAND-BORG CORPORATION 

3450

 West Oakton  Street, Skokie, Illinois 60076-2951 

(708) 679-0900

GENERAL DESCRIPTION

The Rauland DAK Series amplifiers are designed for use with Rauland's

institutional program and communication systems. They offer high-quality sound

and dependability. They can be driven to their rated power output by an input
signal as low as 

0.3 

volts. Their transformer-isolated, 25-volt balanced out-

put matches the output of Rauland's communication panels; they also have a

70.7-volt  balanced output. Their outputs can operate with a split center tap

with Rauland's Telecenter® 5000 and Responder@ 3000 systems. The amplifiers
are listed by Underwriters Laboratories,

The DAX amplifiers offer helpful power connections for related equipment:

three 120-VAC three-pin grounded outlets,

and a floating auxiliary DC power

output (28 VDC, 1.2 A) that can be used for Rauland's Director Series control
panels, preamplifiers, graphic equalizer, and other equipment.

The amplifiers come with black-enamel face panels. Optional brushed-

chrome dress panels-- the RP2525 (DAX6O) and RP2700 (DAX120)--are  available.

UNPACKING

The amplifier was thoroughly checked at the factory. Inspect the amplifi-

er,

the enclosed parts,

and the shipping container for signs of improper han-

dling during shipment. In case of damage,

immediately place a claim: with the

dealer or distributor from whom you purchased the unit or--if the unit was
shipped directly to you--with the carrier.

The following parts are included with the amplifier:

D e s c r i p t i o n

Qty.

Rauland
Part No.

Rack-Mounting Screws for tapped holes (l0-32 x ½" hex-head, WA202

SEMS, unslotted, machine).

4 Rack-Mounting Screws for untapped holes (10 x ½" pan-head, WA102

slotted, thread-forming).

4 #l0 Tinnerman "U" type Speed Nuts, for untapped rack holes. AB1889

INSTALLATION

The amplifier should be rack-mounted where there is adequate ventilation,

a moderate temperature, an AC power outlet, and provisions for grounding.

The rack should have the standard 19-inch  width and a vertical space of at

least 5¼ inches (DAX6O) or 7 inches (DAX120). It is recommended that addition-

01987 RAULAND-BORG CORPORATION PRINTED IN U.S.A. 7/87

Page 1 of 17

Summary of Contents for DAX60

Page 1: ... graphic equalizer and other equipment The amplifiers come with black enamel face panels Optional brushed chrome dress panels the RP2525 DAX6O and RP2700 DAX120 are available UNPACKING The amplifier was thoroughly checked at the factory Inspect the amplifi er the enclosed parts and the shipping container for signs of improper han dling during shipment In case of damage immediately place a claim wi...

Page 2: ...k Mounting The DAK Series amplifiers are designed to be mounted into a standard 19 inch rack lO U nuts AB1889 and two kinds of mounting screws are supplied with each amplifier A If the rack s holes are untapped select the 10 thread forming screws WA102 Push the l0 U nuts their flat side facing proper holes in the rack you may have to leave the U holes are extruded outward onto the nuts off if the ...

Page 3: ......

Page 4: ...l source should deliver at least 300 millivolts into a 13 kilohm load Route the input cables as far from the speaker cables as possible to prevent coupling OUTPUT CONNECTIONS The output screw terminals are located on the upper right corner as viewed from the rear of the chassis The following illustration shows how the output transformer s split windings are connected with a factory installed link ...

Page 5: ... linked together either one of them may be connected to the GND terminal DO NOT INSTALL A JUMPER BETWEEN GROUND AND CT WITH THE UNBALANCED SPEAKER CONNECTION CONNECTING BOTH POINTS TO GROUND WOULD CREATE A SHORT CIRCUIT ACROSS THE OUTPUT TRANSFORMER Split Center Tap Operation The amplifier output transformer can be configured for split center tap operation with symmetrical output voltages on both ...

Page 6: ...er cord with one approved for 240 VAC operation CAUTION When the amplifier is connected to a 240 volt supply its three 120 VAC convenience outlets will supply 240 volts Accordingly they should not be used when the amplifier is connected to 240 volts SETTING THE INPUT LEVEL CONTROL The input level control marked LEVEL on the rear chassis below the out put transformer see Figure l can be adjusted wi...

Page 7: ...ppears in order try replacing the fuse If the amplifier still fails to respond unplug the power cord and contact your local Rauland distributor There are two circuit breakers protecting this output CB2 is a 1 6 Amp thermal breaker that shuts down the circuit when the DC current flow significantly exceeds the output s 1 2 Ampere rat ing then automatically resets It will continue cycling off and on ...

Page 8: ...s Disconnect the speakers and con nect a suitable resistive load in their place DAX6O The load should have at least a 60 watt power rating and a value of 10 4 ohms across the 25 volt output or 83 3 ohms across the 70 7 volt output DAX120 The load should have at least a 120 watt power rating and a value of 5 2 ohms across the 25 volt output or 41 6 ohms across the 70 7 volt output Step 2 Plug the a...

Page 9: ... of the nearest T terminal in that leg of the circuit and if possible take the readings between such a T terminal and T 14 On the DAX120 Connect the meter s negative lead to the amplifier common at Connector J1 13 As you locate each AC voltage on the schematic note the number of the nearest J terminal in that leg of the circuit and if possi ble take the readings between such a J terminal and J1 13...

Page 10: ...citor is not grounded to the chassis in the DAX60 Step 2 Use an ohmmeter to check for a short between the transistor case and the heat sink If there is a low resistance reading check the insulator the screws etc as possible causes Step 3 After obtaining a high resistance reading at least 100 kilohms be tween each transistor case and the heat sink re establish the connection between the negative si...

Page 11: ...n the 28 VDC supply a short circuit on the DC output or a DC load that draws significantly more current than 1 2 Amperes will cause Thermal Breaker CB2 to open within 70 seconds It will try to reset within 15 seconds then continue opening and closing until the short or the excessive load is removed at which time it will remain closed for normal operation A more serious problem will cause CBl to op...

Page 12: ...uced output from Q5 and Q6 to the power transistors will reduce the overall gain and thereby the total power of the amplifier An excessive current surge will cause the fuse to open In the 28 VDC supply a short circuit on the DC output or a DC load that draws significantly more current than 1 2 Amperes will cause Thermal Breaker CB2 to open within 70 seconds It will try to reset within 15 seconds t...

Page 13: ... at 3 db B from RPO Less than 3 from 84 dB with LEVEL 90 dB with LEVEL 13 kilohms 0 3 v 60 Hz to 15 kHz control at maximum control at minimum DAX60 105 130 VAC 60 Hz 935 watts AC and DC outputs setting setting including the DAX120 105 130 VAC 60 Hz 1105 watts including the AC and DC outputs Supplies 1 2 Amperes at 28 VDC With 28 VDC Auxiliary Output Disconnected DAXGO DAX120 No signal 12 watts 12 ...

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