Toa DA-250F CU Operating Instructions Manual Download Page 3

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1. IMPORTANT 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 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. A polarized plug has two blades

with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. 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.

• Only use attachments/accessories specified by the manufacturer.

• Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,

or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.

• Unplug this apparatus during lightning storms or when unused for long periods of time.

• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been

damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or
has been dropped.

Note: 

This equipment has been tested and found to comply with the limits for a Class A digital

device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

• Consult the dealer or an experienced radio/TV technician for help.

FCC REQUIREMENTS

• This Class A digital apparatus complies with Canadian ICES-003.

• Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.

Summary of Contents for DA-250F CU

Page 1: ...WER AMPLIFIERS DA 250F CU DA 250FH CU Thank you for purchasing TOA s Multichannel Power Amplifier Please carefully follow the instructions in this manual to ensure long trouble free use of your equipm...

Page 2: ...ont 8 Rear 9 8 CONNECTIONS 8 1 Procedure 10 8 2 Button Settings and Speaker Connections 10 9 REMOVABLE TERMINAL PLUG CONNECTION 12 10 INPUT SENSITIVITY AND HIGH PASS FILTER ON OFF SETTINGS 13 11 PROTE...

Page 3: ...torms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug...

Page 4: ...as there are high voltage components inside the unit Refer all servicing such as modification inside the unit to qualified service personnel Do not place cups bowls or other containers of liquid or me...

Page 5: ...AC outlet use the AC outlet with current capacity allowable to the unit When the Unit is in Use Make sure that all volume controls are set to minimum position before power is switched on Loud noise p...

Page 6: ...ase Input output status LED indicators for each channel Built in protection circuitry disconnects the output when a short circuit overload or unusual temperature rise occurs 1U size 44 5 mm reference...

Page 7: ...Perforated Panel larger than 1U in size 1 at the top and the bottom of the rack and 2 above and below every 5 units Perforated panel Power amplifiers DA 250F 250FH Power amplifiers DA 250F 250FH Robu...

Page 8: ...and 4 In this event the CH 4 volume control cannot be used 4 Ventilation panel Air Vent A filter is located inside the ventilation panel To clean the filter remove the ventilation panel See p 15 Clea...

Page 9: ...wiring See p 10 The unit s input mode changes as follows depending on the BRIDGE ON OFF button setting 4 channel input mode Set both BRIDGE 1 and 2 buttons to OFF 3 channel input mode Set either BRID...

Page 10: ...terminal cover in place BRIDGE 1 ON OFF button BRIDGE 2 ON OFF button CH 1 mode ON OFF button CH4 CH3 CH2 CH1 Speaker output terminals Button BRIDGE 1 BRIDGE 2 CH 1 mode OFF OFF OFF Setting 4 8 4 8 4...

Page 11: ...Setting CH3 CH4 3 inputs 3 outputs 2 CH3 CH4 CH1 CH3 CH4 CH1 CH2 Speaker output terminals 8 16 4 8 4 8 39 2 19 6 19 6 DA 250F DA 250FH BRIDGE 1 Button BRIDGE 1 BRIDGE 2 CH 1 mode ON OFF OFF Setting C...

Page 12: ...old Earth Bit shape 3 mm 9 REMOVABLE TERMINAL PLUG CONNECTION Cautions Be sure to use shielded cables for audio signal lines Avoid soldering cable conductor as contact resistance may increase when the...

Page 13: ...socket position to 4 dB or 10 dB for the Input sensitivity and to ON or OFF for the High pass filter DA 250FH only as illustrated below DA 250F 250FH Viewed from top with the top cover detached Front...

Page 14: ...mperature over 110 C Load disconnected Protection indicator lights Temperature rise inside the unit over 80 C Built in amplifier unit that caused the failure halted Four indicators of the correspondin...

Page 15: ...move 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 Detach the panel...

Page 16: ...E 1 OUTPUT Current Limitter Short Detector Protection Circuit OUTPUT 2 relay CH 1 to all switch Current Limitter Short Detector Protection Circuit OUTPUT 3 relay CH 3 OUTPUT CH 4 OUTPUT 4 dB 10 dB CH...

Page 17: ...10 dB CH 2 volume control ON OFF BRIDGE 1 ON OFF switch BRIDGE 1 OUTPUT Current Limitter Short Detector Protection Circuit OUTPUT 2 relay CH 1 to all switch Current Limitter Short Detector Protection...

Page 18: ...18 15 DIMENSIONAL DIAGRAM Unit mm 482 465 400 374 20 31 8 44...

Page 19: ...0 3 20 Hz 20 kHz 0 3 100 Hz 20 kHz HPF ON 0 3 20 Hz 20 kHz HPF OFF 4 dB 1 23 V 10 dB 0 24 V selectable with the inner jumper 10 k electronically balanced 100 dB Input CH 1 4 Removable terminal block O...

Page 20: ...Printed in Japan 133 22 027 00...

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