Instruction/ maintenance manual of the product DA-250FH CU TOA Electronics
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OPERA TING INSTRUCTIONS MUL TICHANNEL POWER 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 equipment.
2 T ABLE OF CONTENTS 1. IMPORT ANT SAFETY INSTRUCTIONS .................................................... 3 2. SAFETY PRECAUTIONS ............................................................................... 4 3. GENERAL DESCRIPTION ..............
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.
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.
5 shock. • 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.
6 3. GENERAL DESCRIPTION TOA's DA-250F and DA-250FH Multichannel Power Amplifiers feature high power handling capabilities and durability. The DA-250F is configured with 250 W x 4 channels (4 Ω output) and 170 W x 4 channels (8 Ω output), and the DA-250FH features a 250 W x 4 channels (19.
7 6. INST ALLA TION PRECAUTIONS • The supplied power supply cord is designed for exclusive use with this unit. Never use it with other equipment. • When mounting the unit in an equipment rack, the inside of the rack must be sufficiently ventilated.
8 7. NOMENCLA TURE AND FUNCTIONS [Front] 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 volume controls [CH 1 (BRIDGE 1), CH 2, CH 3 (BRIDGE 2), CH 4] Adjust the input volume of each channel.
9 [Rear] 6 7 8 Note: The figure is common to DA-250F and DA-250FH. 9 9 10 11 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.
10 8. CONNECTIONS 8.1. Procedure Step 1. Switch off the unit's power. Step 2. Set the BRIDGE ON/OFF buttons and CH 1 mode ON/OFF button. Step 3. Connect the sound source equipment to the Input terminals. Note Refer to p. 12 for the removable terminal plug connection.
11 [1 input - 2 outputs] CH1 CH1 CH2 CH3 CH4 BRIDGE 1 BRIDGE 2 - + - + – + – + Button BRIDGE 1 BRIDGE 2 CH 1 mode ON ON ON Setting Speaker output terminals 8 – 16 Ω 8 – 16 Ω 39.
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.
13 10. INPUT SENSITIVITY AND HIGH-P ASS FIL TER ON/OFF SETTINGS The Input sensitivity can be set to +4 dB (factory-preset) or -10 dB for each channel. Besides, only the DA-250FH employs the High-pass filter on each channel, which can be set to "ON" or "OFF.
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.
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.
16 H C CH 1 INPUT E H C CH 2 INPUT E Current Limitter 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 vol.
17 14.2. DA-250FH OFF ON CH 2 HPF ON/OFF jumper HPF 50 Hz OFF ON CH 3 HPF ON/OFF jumper HPF 50 Hz OFF ON CH 4 HPF ON/OFF jumper HPF 50 Hz H C CH 1 INPUT E H C CH 2 INPUT E Current Limitter Short Detec.
18 15. DIMENSIONAL DIAGRAM Unit: mm 482 465 400 374 20 31.8 44.
19 16. SPECIFICA TIONS * 0 dB = 0.775 Vrms Note: The design and specifications are subject to change without notice for improvement. • Accessories Power cord (2 m) ................................................................. 1 Removable terminal plug (3P) .
Printed in Japan 133-22-027-00.
An important point after buying a device TOA Electronics DA-250FH CU (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought TOA Electronics DA-250FH CU yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data TOA Electronics DA-250FH CU - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, TOA Electronics DA-250FH CU you will learn all the available features of the product, as well as information on its operation. The information that you get TOA Electronics DA-250FH CU will certainly help you make a decision on the purchase.
If you already are a holder of TOA Electronics DA-250FH CU, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime TOA Electronics DA-250FH CU.
However, one of the most important roles played by the user manual is to help in solving problems with TOA Electronics DA-250FH CU. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device TOA Electronics DA-250FH CU along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
