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1 2 3 4 SAFETY INFORMATION A This service manual is intended to support DIY enthusiasts and AlphaTheta Corporation is not responsible for repair or replacement to your product if damage occurs during a self-repair. Performing self- repairs on your product must be done solely at your own risk. It is strongly advised that a trained and qualified individual performs the repairs properly and safely. If you are not qualified to perform repairs on this product in a proper and safe manner, you should not attempt to do so and instead refer the repair to a qualified service technician. B CONTENTS SAFETY INFORMATION.2 1. SERVICE PRECAUTIONS .3 1.1 SERVICE NOTICE . 3 2.SPECIFICATIONS . 3 3.BASIC ITEMS FOR SERVICE. 4 3.1 CHECK POINTS . . 4 C 4 .DIAGNOSIS. . 5 4 . 1 CONNECTION CHECK WITH EACH INTERFACE . 5 4 . 2 STARTUP ERROR DISPLAY . 6 4 . 3 FACTORY RESET . . 6 5 .DISASSEMBLY. . 8 6 . UPDATING OF THE FIRMWARE . . 10 7 .EXPLODED VIEWS AND PARTS LIST. 12 7 .1 PACKING SECTION . 12 7 .2 EXTERIOR SECTION. 13 D E F 2 euphonia 1 2 3 4
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5 6 7 8 1. SERVICE PRECAUTIONS 1.1 SERVICE NOTICE g About torque for tightening screws for wood panels A When installing wood panels, if tightened too strongly, the panel may crack or split as time goes by. If any failure occurs, refer repair to a qualified technician. 2. SPECIFICATIONS General Power requirements. AC 110 V – 240 V, 50 Hz/60 Hz Power consumption . 43 W Power consumption (off). 0.2 W Main unit weight. 9.5 kg/20.94 lbs. Max. external dimensions .(W × D × H) 429.2 × 331.0 × 119.9 mm/16.90" × 13.03" × 4.72" Tolerable operating temperature. +5 °C – +35 °C (+41 °F – +95 °F) Tolerable operating humidity. 5 % – 85 % (no condensation) Audio section Sampling rate . 96 kHz MASTER, BOOTH, SEND (MASTER INSERT) D/A converter . 32bit CH input A/D converter.32bit Other A/D and D/A converters.24bit Frequency characteristic LINE. 20 Hz – 40 kHz S/N ratio (rated output, A-WEIGHTED) USB, DIGITAL IN . 107 dB PHONO . 88 dB LINE. 105 dB MIC. 79 dB Standard input level/Input impedance PHONO .-52 dBu/47 k Ω LINE.-12 dBu/47 k Ω MIC.-57 dBu/ 3.5 k Ω RETURN.-12 dBu/47 k Ω Max. input level PHONO . -17.8 dBu LINE. +15 dBu MIC. +2 dBu RETURN. +12 dBu Standard output level/Load impedance/Output impedance MASTER. +6 dBu/10 k Ω /360 Ω REC OUT . -8 dBu/10 k Ω /700 Ω BOOTH. +6 dBu/10 k Ω /360 Ω SEND (EXTERNAL) . -9 dBu/10 k Ω /700 Ω SEND (MASTER INSERT) . -12 dBu/10 k Ω /700 Ω PHONES . +8 dBu/32 Ω /1 Ω or lower Rated output level/Load impedance MASTER.+25 dBu/10 k Ω BOOTH.+25 dBu/10 k Ω Crosstalk LINE. 82 dB Channel equalizer characteristic HI . -26 dB – +6 dB (20 kHz) MID. -26 dB – +6 dB (1 kHz) LOW .-26 dB – +6 dB (20 Hz) Microphone equalizer characteristic HI . -12 dB – +12 dB (10 kHz) LOW .-12 dB – +12 dB (100 Hz) BOOTH equalizer characteristic HI . -12 dB – +6 dB (10 kHz) LOW .-12 dB – +6 dB (100 Hz) MASTER ISOLATOR characteristic Slope . 18 dB/oct Cut/Boost. OFF – X dB (X = 0, +6, +12) Crossover Freq. . 250 Hz/3.5 kHz Input/Output terminals PHONO input terminal RCA pin jacks . 4 sets LINE input terminal B RCA pin jacks . 4 sets MIC input terminal XLR connector & 1/4” TRS jack .1 set RETURN input terminal 1/4” TS jack. 2 sets DIGITAL IN coaxial input terminal RCA pin jacks . 4 sets MASTER output terminal XLR connector.1 set BOOTH output terminal 1/4” TRS jack .1 set REC OUT output terminal RCA pin jacks .1 set C SEND output terminal 1/4” TS jack. 2 sets PHONES output terminal 1/4” stereo jack .1 set 3.5 mm stereo mini jack.1 set USB terminal USB Type-C.1 set The specifications and design of this product are subject to change without notice. g Accessories D ! Power cord (DDG1123) ! Quick Start Guide (DRH1778) ! Precautions for use (DRH1777) E F euphonia 3 5 6 7 8
