Louroe Electronics DG-25III Installation And Operating Instructions Manual
Also see for DG-MA: Installation and operating instructionsInstallation and operating instructions
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PAGE 19 of 28CONNECTING AN EXTERNAL AMPLIFIER:An external amplifier can be connected between the DG-MA and DG-25III to boost thepower of its talkback capability. The DG-MA is factory set with a 70V audio output. Beforeconnecting to an external amplifier, change the audio output to 600 Ohms as follows.Remove the top lid or cover of the DG-MA is a slide switch located near the large blackcapacitor and with the number 230 visible. The switch position is factory set at 70Voutput which is towards the center of the PC board. Insert a small screwdriver into theslot of the switch lever and slide the switch to the left or towards the power transformer. A115 mark will appear. This will change the audio output to 600 and will serve as a pre-amp for the external amplifier. Replace the cover of the DG-MA.See Fig. 15 for the cable interconnection between units. The “Audio in” and “Audio Out”Terminal of the external amplifier can be RCA jacks. In such case, the interconnect cablebetween the DG-MA Control Terminal Block [40] numbers “1” and “3” and externalamplifier “Audio In” should be two spade lug terminals on one end and on RCA plug onthe other. Also the cable between “Audio Out” of the external amplifier and DG-25IIIplug-in connector numbers “3” and “5” should be an RCA plug on one end and two opentinned wires on the other. Double check the connections before testing. The talkback willnot work properly if the connections are interchanged.Fig. 15 Connecting an external amplifierZONE 18 ZONE 15ZONE 16ZONE 191 2 3 4 5TB GNDTB RETURNTB AUDIOALL CALL CTRLGNDJP51INPUTOUTPUTAUDIOREAR OF DG-MAGND AUDIO IN SPEAKERRETURNAUDIOOUTREAR OF DG-25IIIEXTERNAL AMPLIFIERINSTALLATION AND OPERATING INSTRUCTIONSLOUROE ELECTRONICS 6 9 5 5 VA L J E A N AVENUE, VAN NUYS, CA 91406 TEL (818) 994-6498 FAX 994-6458website: www.louroe.com e-mail: sales@louroe.com(818)®dg_25_inst_1/12 |
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