Instruction/ maintenance manual of the product W-912A TOA Electronics
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OPERA TING INSTR UCTIONS NEW 900 SERIES IN-W ALL MIXER PO WER AMPLIFIER W -906A W -912A INPUT 1 POWER ON 250V 3A 250V 6A OFF OFF MAX INPUT 2 INPUT 3 AC FUSE OFF ON LOW PASS OFF ON HIGH PASS OUT 63 125.
2 1. GENERAL DESCRIPTION The TOA W-906A and W-912A Mixer Power Amplifiers control and mix up to six independent input signals plus two inputs with use of expanding kit.
3 3. NOMENCLA TURE AND FUNCTIONS [Front] 1. Power switch Applies line power. Two-position push button switch for on-off modes. 2. Input volume controls Adjust gain of input 1 – 6 respectively. 3. Master volume controls Adjust overall gain of unit. 4.
4 [Front] (vie w ed with the front cov er remo v ed) 17. AC power cord Connects to power source. 18. Speaker output terminals Connects to speakers. 19. Output terminals Select output impedance with this terminal. 20. Low-cut switch Cuts off unnecessary low frequency.
4. INST ALLA TION AND CONNECTION Installing this amplifier requires the optional back box, which is Model BX-9F for flush mounting in any 4 inch wall and Model BX-9S for surface mounting. Fix the back box first in installing the amplifier... Installing Procedure Step 1.
Step 6. Fixing the amplifier Fix the amplifier to the back box with screws after connecting the power cable and the speaker cable. Step 7. Selecting output impedance Select appropriate output impedance that matches the speaker to be used. Class 2 wiring may be used.
7 Step 8. Input connections • This unit has six INPUT PORTS for plug-in modules. Select the desired modules for each application. • Plug the modules into INPUT PORTS, sliding them between the guide rails, and secure each with two screws.
8 Input Expander The optional expanding kit (WE-2) is necessary to increase the number of input. Up to two inputs may be added by loading the expanding kit in the user's space.
Compressor If the COMPRESSOR CONTROL switch is set to OFF, it bypasses the compressor circuit. Turn it clockwise to activate the compressor and to adjust the limiting level. Since turing it fully clockwise far too much limits the output level, set the switch at a maximum point that does not cause the peak indicator to light up.
10 9. BLOCK DIA GRAM 8. OUTPUT EQ CHARA CTERISTIC 1 A 2 B High-pass filter (180 Hz, 12 dB/Oct.) Low-pass filter (7 kHz, 12 dB/Oct.) Equalizer Out Compressor (Limiter) Control Release Time Equarizer Control 63 Hz – 16 kHz Bridging In/Out – 20 dBV, 3.
11 10. SPECIFICA TIONS Model No. Type Output Power Power Bandwidth Frequency Response Total Harmonic Distortion Inputs Input Sensitivity/Impedance Outputs Output Regulation (1 kHz) Signal to Noise Rat.
133-02-738-9B • Accessories Flush-mounting (in-wall) back box: BX-9F Surface-mounting (on-wall) back box: BX-9S Expanding kit: WE-2 Volume control cover (black): YA-910 • Optional products Volume control cover .....................................
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If you already are a holder of TOA Electronics W-912A, 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 W-912A.
However, one of the most important roles played by the user manual is to help in solving problems with TOA Electronics W-912A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device TOA Electronics W-912A 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
