User manual AUDIO TELEX DCM500

[. . . ] The DCM500 also features a DC battery trickle charge facility, slow start on powering up (to reduce inrush current problems), auto-sensing ftn cooling, plus overload short circuit and over ternperature protection. The maximum recommended load for the DCM500 is 20 ohms. lnitial Set Up Turning this control in the clockwise direction will increase the power output, turning this comtrol in a counter-clockwise direction will reduce the power output. The ftctory default setting for this conkol is such that a I volt input will give a 100 volt output. [. . . ] The fans will stay on and only switch off again mce the temperature of the DCM500 has fallen below a pre-determined level. So, the ftct that the fans are not operating at any time (and most noticeably to the operator at turn-on) does not mean that the amplifier is faulty in any way, just that it is o'perating within a temperature range that does not need frn cooling for adequate heat dissipation. If the DCM500 is operating curtinually at c. onservative levels and proper load conditions, it is possible that the cooling fans will not switch on at anytime during normal operation. When operating, the fans cause air flow from the front to the rear of the DCM500. Continuednext page3 Amplifier Status Display Window: The status display window highlights the operating conditions of the DCM500. Please refer to Figwe #1 on the back page of this instruction sheet with numerical reference as follows: High Temperature: firis red LED glows if the fan has failed and the amplifio has been shut down by its' temperature control circuity. If this LED is glowing and the fans have not failed, it means that the amplifier is operating in an ambient environment that it naturally too hot for fan cooling to make any difference to the temperature of the amplifier. PoWef: This LED glows green if AC power is switched on to the DCM500. Note that this LED does not indicate the presnce ofa DC supply voltage lUlains Failure: The LED glows red if there is a failure in the AC mains power supply. However, this LED glow if there is a DC supply voltage present. If no DC supply voltage is present then this LED will not glow. will only Output Level VU A 10 segment LED W meter is provided to give an indication of the output signal level of the DCM500 from -25 to +3 dB. For normal operation the LED's should oscillate in and out of the red zone. If the LED's in the red zone are lit continually, the, n the output level control (or the level of the input signal to the DCM500) should be adjusted to reduce the output level. Too much output level can cause distortion and possible damage to the connected speaker lleter: qystem. Rear Panel Connections Please refer to Figure #2 on the back page of these instructions with numerical references as follows: 3 pin lEC, AC mains power inlet. The operating voltage is 240 VAC @ 50llzor l t0 @ 60 rIz. The AC power voltage level is not externally user selectable but is ftctory pre-set (via transformo selection). [. . . ] The pin configuration of both sockets is as follows: pin #l-earth; pin #2-active (high, +); pin #3-active (lol", -j. The output socket is to allow the original input signal to be fed on to another amplifier. As these trvo sockets are wired in passive parallel, the failure of any one amplifier will not affect the sigrral flowing through that amplifier to anotho amplifier. lnput (& parallel_output) XLR signal connectiolr. [. . . ]