User manual AUDIO TELEX DCM120

[. . . ] The DCMI2O also features a DC battery tickle charge facility, auto-sensing fan cooling, plus overload, shrt circuit and over temperature protection. The maximum recommended load for the DCM120 is 80 ohms. lnitial Set Up There is an unlabelle4 screwdriver adjustable output level contol located curfrally on the front panel of the DCMI20. will increase the power output, turning this control in a counter-clockwise direction will reduce the power output. [. . . ] The fan will stay on and only switch off again once the temperature of the DCM120 has frllen below a pre-determined level. So, the hct that the frn is not operating at anytime (and most noticeably to the oprator at turn-ur) does not man that $s emplifia is ftulty itt any way, just that it is oprating within a tmprature range that does not need ftn cooling for adequate heat dissipation. If the DCMI2O is operating continually at conservative levels and froper load cmditions, it is possible that the cooling frn will not switch on at any time during normal operation. When operating, the ftn cause air flow from the front to the rear ofthe DCM120. Continued noct page3 Amplifier Status Display WindoW: Please refer to Figure #1 on the back page ofthis instruction The status display window highliehts the operating conditions of the DCM120. sheet with numerical reference as follows: t High TempefatUfe: Z This red LED glows if the hn has failed and the amplifier has been shut down by its' temperature control circuitry. If this LED is glowing and the fans have not ftiled, it means that the amplifio is operating in an ambient environme, nt that it naturally too hot for ftn cooling to make any difference to the temperature of the amplifier. PoWef: This LED glows green if AC power is switched on to the DCM120. Note that this LED does not indicate the presnce of a DC supply voltage Failure: The LED glows red if there is a ftilure in the AC mains power supply. However, this LED glow if there is a DC supply voltage present. If no DC supply voltage is preseirt then this LED will not glow. tlains will only Output Level VU A 10 segment LED meter is provided to give an indication of the output signal level of the DCMI2O from -25 to +3 dB. For normal opration the LED's should oscillate in and out of the red zone. tf the LED's in the red zone are lit continually, then the output level control (or the level of the input signal to the DCMI2O) should be adjusted to reduce the output level. Too much output level can cause distortion and possible damage to the cornected speaker system. ileter: w Rear Panel Gonnections Please refer to Figure #2 on the back page of these instructions with numerical references as follorrys: 3 Pin lEC, AC Mains Power lnlet. The operating voltage is 240 VAC @ 50Hzor 110 VAC @ 60llz. The AC power voltage level is not externally user selectable but is factory prs'set (via transformer selection). [. . . ] Access the DC fuse by turning the cap half a tum counter-clockwise with a screwdriver. The value of the fuse is l0 Amps Please ensure that the AC power switch is in the 'ofr position and that the mains power cord is disconnected before attenpting to check or replace this fusc The input to the DCM120 is transformer balanced @ 10K ohms. The pin configuration of both sockas is as follows: pin #l-earth; pin #2-active (hrgh, +); pin #3-active (low, -). [. . . ]