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Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Toa DA-250DH CU alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Toa DA-250DH CU, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Toa service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Toa DA-250DH CU.
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Table of contents for the manual
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Page 1
DUAL POWER AMPLIFIERS DA-250D CU DA-250DH CU Thank you for purchasing TOA's Dual Power Amplifier. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment. Note: The figure shows the DA-250D. OPERA TING INSTRUCTIONS[...]
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2 T ABLE OF CONTENTS 1. IMPORT ANT SAFETY INSTRUCTIONS .................................................... 3 2. SAFETY PRECAUTIONS ............................................................................... 4 3. GENERAL DESCRIPTION ............................................................................. 6 4. FEA TURES ....................[...]
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3 1. IMPORT ANT SAFETY INSTRUCTIONS • Read these instructions. • Keep these instructions. • Heed all warnings. • Follow all instructions. • Do not use this apparatus near water. • Clean only with dry cloth. • Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. • Do not install near[...]
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4 When Installing the Unit • Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as doing so may result in fire or electric shock. • Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified may result in fire or electric shock. • Do not cut, [...]
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5 • When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit with the power cord connected to the outlet may cause damage to the power cord, resulting in fire or electric shock. When removing the power cord, be sure to hold its plug to pull. • Avoid installing the unit in humid or dusty locations, in l[...]
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6 3. GENERAL DESCRIPTION TOA's DA-250D and DA-250DH Dual Power Amplifiers feature high power handling capabilities and durability. The DA-250D is configured with 250 W x 2 channels (4 Ω output) and 170 W x 2 channels (8 Ω output), and the DA-250DH features a 250 W x 2 channels (19.6 Ω output) configuration. Besides, each model's output[...]
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Rack mounting screws are not supplied with the unit. Be sure to use the screws with a diameter of over 5 mm (0.2") and length of over 12 mm (0.47") to mount the unit. Failure to do so may cause personal injury. CAUTION 6. INST ALLA TION PRECAUTIONS 7 • The supplied power supply cord is designed for exclusive use with this unit. Never us[...]
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Page 8
8 1. Power switch [ ON / OFF] Power is switched on and off with each depression of this switch. 2. Power indicator [POWER] Lights blue when the power is switched on. 3. Input level controls [CH 1/BRIDGE, CH 2] Adjust the input level of each channel. 4. Ventilation panel (Air Vent) A filter is located inside the ventilation panel. To clean the filte[...]
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9 [Rear] 6 7 9 10 11 DA-250D DA-250DH 8 6 7 9 10 11 8 6. AC inlet Connect the supplied power cord to this inlet. 7. Functional ground terminal [SIGNAL GND] Hum noise may be generated when external equipment is connected to the unit. Connecting this terminal to the functional ground terminal of the external equipment may reduce the hum noise. Note T[...]
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10 Step 1. Switch off the unit's power. Step 2. Set the BRIDGE ON/OFF switch and CH 1 mode ON/OFF switch. Step 3. Connect the sound source equipment to the Input terminals. Note: Refer to p. 12 for the removable terminal plug connection. Step 4. Connect speakers to the Speaker output terminals. 4-1. Unscrew the output terminal cover. 4-2. Stri[...]
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Page 11
11 CH2 CH1 Speaker output terminals Switch BRIDGE CH 1 mode OFF OFF Setting 4 – 8 Ω 4 – 8 Ω 19.6 Ω 19.6 Ω CH1 CH1 CH2 CH2 DA-250D DA-250DH [2 inputs - 2 outputs] (factory-preset) Speaker output terminals Switch BRIDGE CH 1 mode ON OFF Setting 8 Ω 39.2 Ω CH1 CH1 CH2 DA-250D DA-250DH CH2 CH1 Speaker output terminals Switch BRIDGE CH 1 mode [...]
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Page 12
Cable end treatment 12 Connector connections Step 1. Loosen the terminal screw, then insert the cable. Step 2. Retighten the terminal screw. (Pull on the cable to ensure it is securely connected.) Tip Recommended slotted screwdriver type: Screwdriver with blade that is 3 mm (0.12") in width T ightens Loosens T erminal screw Slotted screwdriver[...]
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Page 13
13 The Input sensitivity can be set to +4 dB (factory-preset) or -10 dB for each channel. Besides, only the DA-250DH employs the High-pass filter on each channel, which can be set to "ON" or "OFF." Step 1. Unscrew 7 screws securing the top cover of the unit, then detach it. Step 2. Change the jumper socket position to "+4 d[...]
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14 1 1. PROTECTION OPERA TION LIST Failure Protection Operation Indicator Remedy Recovery Overcurrent due to overload Current limiter activated when impedance drops below the specified value. Peak indicator lights. Remove overload. Connecting a correct load automatically restores normal operation. Short circuit Current limiter activated. Load is di[...]
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15 13. CLEANING THE FIL TER Step 1. Switch off the unit's power. Step 2. Remove the ventilation panel as shown in the figure. Step 3. Detach the filter inside the ventilation panel. Step 4. Clear the filter of dust. Step 5. Replace the filter and ventilation panel. Ventilation Panel 2 3 Filter Ventilation Panel Detach the panel by pressing on [...]
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16 H C CH 1 INPUT E H C CH 2 INPUT E Current Limiter Short Detector Protection Circuit OUTPUT 1 relay CH 1 OUTPUT CH 2 OUTPUT +4 dB - 10 dB CH 1 sensitivity selection jumper (+4 dB/ - 10 dB) CH 1 input level control +4 dB - 10 dB CH 2 sensitivity selection jumper (+4 dB/ - 10 dB) CH 2 input level control ON OFF BRIDGE ON/OFF switch + - BRIDGE OUTPU[...]
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17 15. DIMENSIONAL DIAGRAM Unit: mm (inches) 401.8 (15.82) 371 (14.61) 22.5 (0.89) 482 (18.98) 465 (18.31) 442 (17.4) 31.8 (1.25) 44 (1.73)[...]
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Page 18
18 * 0 dB = 0.775 V Note: The design and specifications are subject to change without notice for improvement. Power cord (2 m) ................................................................. 1 Removable terminal plug (3 pins) ........................................ 2 Tamper-proof cap ..............................................................[...]
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Page 19
19 * 0 dB = 0.775 V Note: The design and specifications are subject to change without notice for improvement. Power cord (2 m) ................................................................. 1 Removable terminal plug (3 pins) ........................................ 2 Tamper-proof cap ..............................................................[...]
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133-22-125-50 URL: http://www.toa.jp/[...]