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Protective circuits: There are several protections against excessive cur-

rent. Transistors Q4 and Q7 are current limiters. If a short occurs across
the audio output,

the following sequence of events will occur: (1) the DC vol-

tage across Resistors R29 and R32 will drop; (2) this drop will drive Transis-
tors Q4 and Q7 into conduction; (3) the output of Q4 and Q7 will limit the

drive to Transistors Q5 and Q6; and (4) the. reduced 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, 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 prob-
lem will cause CBl to open;

it must be reset manually.

Summary of Contents for DAX120

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 wa...

Page 2: ...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...

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Page 4: ...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...

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 CREA...

Page 6: ...r 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 u...

Page 7: ...pears 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...

Page 8: ...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 ohm...

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 Con...

Page 10: ...itor 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...

Page 11: ...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 wi...

Page 12: ...ced 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...

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...

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