Alpine HDS-990 HDS-990 Owners Manual - Page 10

Connections and Functions ① Front USB Connector Used to connect U disk, mobile hard disk or USB HUB. ② Reset Button Press and hold for 3 seconds to restart the host. ③ Rear Double USB Connector Connect the USB or mobile hard disk through the attached USB extension wire. ④ Commander Connector It can be connected to the controller for play control, volume adjustment, and audio source selection. ⑤ Power Indicator The power-on light is always on, and the power-off light is off. ⑥ Multiple Line Connector Including 1 set of 3.5mm socket audio input, 3 sets of RCA audio output, optical output, coaxial output interface, steering control interface, Alpine system matching interface (for DSP product connection) and USB audio input. ⑦ High Level Input connector Connect to the power output of the car audio player. ⑧ Input Select Switch When dialed to the "ACC" end, ACC starts the machine; when dialed to the "HOST" end, the high level input signal FL-/FL+ starts the machine. ⑨ Power Output Connector Connect the car battery. ⑩ Speaker Output Connect an speakers. ⑪ Multiple Line External function expansion interface. ⑫ Car Audio Player (Sold separately) Connect the car audio player. ⑬ Commander To prevent external noise from entering the audio system.  The installation position of the machine and the wiring arrangement should be at least 10cm away from the automobile wiring harness.  Try to keep the battery power cord away from other wires.  Securely connect the ground wire to the bare metal contacts of the car chassis (remove any paint, dirt or grease if necessary).  If you want to attach an optional noise suppressor, please try to keep it away from the machine when connecting. Your Alpine dealer has various types of noise suppressors, please contact them for details.  Your Alpine dealer is proficient in noise prevention methods, please consult your dealer for details. 7 EN