User manual MACKIE HM54

[. . . ] Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. [. . . ] When the power switch is turned ON (up), power is supplied to the HM-54 and the power ON indicator lights up. 1 PHONES MAIN DIRECT 2 PHONES MAIN DIRECT 3 PHONES MAIN DIRECT 4 HM-54 HEADPHONE MIXER/AMPLIFIER PHONES MAIN DIRECT ON O O O O MAX O O MAX O O MAX O O MAX MAX MAIN INPUT LEVEL SOURCE LEVEL SOURCE LEVEL SOURCE LEVEL SOURCE LEVEL 8 HM-54 Rear Panel The rear panel is where you make all your analog audio connections to the HM-54 (except for the convenient additional headphone jacks on the front). 9. LEFT and RIGHT MAIN INPUT These 1/4" TRS jacks accept a balanced or unbalanced line-level input signal. This is the signal that you select when you leave the SOURCE select switch [3] on the front panel in the out position, so connect the main mix output from the mixer to these inputs. The 1/4" TRS inputs are wired as follows: Sleeve = Shield or ground Tip = Positive (+ or hot) Ring = Negative (­ or cold) If you are connecting a mono input signal to these inputs, use a Y-Cord splitter to connect the signal to both inputs (otherwise you will only hear the effects in one side of the headphones). See "Mults and Y's" in Appendix B for more info. Owner's Manual 6. Connect the detachable linecord (included in the box with your HM-54) to the power receptacle, and plug the other end of the linecord into an AC outlet properly configured for your particular model. 7. LEFT and RIGHT PHONES INPUT These 1/4" TRS jacks accept a balanced or unbalanced line-level input signal. This is the signal that you select when you push in the SOURCE select switch [3] on the front panel, so connect the individual headphone mix from the mixer to these inputs. The 1/4" TRS inputs are wired as follows: Sleeve = Shield or ground Tip = Positive (+ or hot) Ring = Negative (­ or cold) If you are connecting a mono input signal to these inputs, use a Y-Cord splitter to connect the signal to both inputs (otherwise you will only hear the signal in one side of the headphones). See "Mults and Y's" in Appendix B for more info. 10. This allows you to use the headphone output from your mixer to provide the main mix signal to the HM-54. Simply use a TRS-to-TRS cable to connect the PHONES output from the mixer to this input on the HM-54. Note: Plugging the main mix signal into the MAIN PHONES INPUT jack automatically disconnects the LEFT and RIGHT MAIN INPUT [9] jacks. 8. PHONES OUTPUT This is another headphone output that duplicates the PHONES [2] output on the front panel. Typically, you would use these when installing the HM-54 in a rack and hard-wiring the headphone outputs to a patch panel in the rack. Note: Plugging headphones into the front panel PHONES jack automatically disconnects the signal from the rear panel PHONES jack. HM-54 PHONES INPUT LEFT RIGHT 4 OUTPUT PHONES PHONES INPUT LEFT RIGHT 3 OUTPUT PHONES PHONES INPUT LEFT RIGHT 2 OUTPUT PHONES PHONES INPUT LEFT RIGHT 1 OUTPUT PHONES MAIN LINE INPUT LEFT RIGHT PHONES INPUT ~120VAC 50/60 HZ 12W . 25A/250V Owner's Manual 9 HM-54 Appendix A: Service Information Warranty Service Details concerning Warranty Service are spelled out in the Warranty section on page 15. If you think your HM-54 has a problem, please do everything you can to confirm it before calling for service. Doing so might save you from the deprivation of your headphone amp and the associated suffering. These may sound obvious to you, but here are some things you can check. Bad Output · If you are listening to a PHONES OUTPUT [8] on the rear panel, make sure that nothing is plugged into the corresponding PHONES out on the front panel. If only one side of the stereo headphones is working, make sure you have a signal at both inputs. There must be a signal present at both inputs [7][9][10] to get a signal in both sides of the headphone output. · Troubleshooting No Power · · Our favorite question: Is it plugged in? [. . . ] Ship the product in its original shipping carton, freight prepaid to the authorized service center. The address of your closest authorized service center will be given to you by Technical Support. IMPORTANT: Make sure that the Service Request Number is plainly written on the shipping carton. LOUD Technologies reserves the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out. [. . . ]