Instruction/ maintenance manual of the product A-903MK2 TOA Electronics
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TOA 90 0 SERIES II MIXER POWER AMPLIFIER Operating Instructions A-903MK2 A-906MK2 A-912MK2 TO REDUCE THE RISK O F ELECTRICAL SHOCK, D O N OT REMOVE COVER.
Contents General description Features Nomenclature Fr ont panel Rear panel Input connections Output c onnections (A-903MK2) Output connections (A-906MK2/A-912MK2) Muting and remote volume control conn.
General Description The T OA A-903MK2, A-906MK2 a nd A-912MK2 Mixer Power Amplifiers control and m i x u p to eight independent input signals. T h e A-903MK2 delivers u p to 3 0 watts of output power, the A-906MK2 6 0 watts and A-912MK2 1 2 0 w atts.
Nomenclature Front Panel Power Switch Applies line power. T wo-position push button switch f or on /of f modes. Power Indicator L E D Green L ED lights whe n th e power i s switched "ON".
Rear Panel AC Power Cord Connects to power source. A C Outlet (Unswitched) Prov ides A C power f o r auxiliary equipment with power consumption of up to 500W. Output terminals Connect to speakers. Impedance Select Sw itch Selects the desired impedance.
Input Connections There are eight INPUT PORTS f o r PLUG-IN MODULES. Se lec t the desired modules for each application. Plu g the modules in to t h e INPUT PORTS. Slide th em between the guide rail s and s ecure w it h t wo screws. CAUTION : Modules s hould no t be inserted or removed while the amplifier i s turned on.
T o connect speakers to 8-ohm output (UNBALANCED DIRECT OUTPUT) (A-903MK2) 8-ohm Loosen the screw. Place the impedance switch in 8-ohm p o s ition. Tighten th e s c re w. Output Connection (A-906MK2/A-912MK2) The speaker outputs of the amplifier are 4 ohm s, 8 ohm s, 25V an d 70V.
T o connect speakers to 4-ohm output (UNBALANCED DIRECT OUTPUT) (A-906MK2/A-912MK2) 4-ohm Loosen the s crew. P la c e th e impedance switch i n 4-ohm po s ition.
Operation After a ll connections ar e made, t u r n power switch O N, illuminating the Power Indicator L ED . The amplifier comes int o operation approximately 5 seconds after the power is turned on . Volume Adjustment Obtain de sir ed output lev el b y adjusting the individual input an d ma st er volume co n tr ol s .
Specifications Type Output Power Power Ba nd Width Frequency Res ponse Total Hamonic Distortion Inputs Input S en s itivity/Impedance Preamp OUT/Power Amp I N Outputs (T)=Transformer (D)=Direct Output.
Appearance (A-903MK2) Front View Rear View Top Vi e w Side View 420 280 318 17 –11–.
Appearance (A-906MK2/A-912MK2) Front View 420 Re ar View Top Vie w Side V ie w 88.4 99.1 320 358 17 TO A Corporation KOBE, JAPAN PRINTED IN TAIWAN 133-12-114-60.
An important point after buying a device TOA Electronics A-903MK2 (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 A-903MK2 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 A-903MK2 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, TOA Electronics A-903MK2 you will learn all the available features of the product, as well as information on its operation. The information that you get TOA Electronics A-903MK2 will certainly help you make a decision on the purchase.
If you already are a holder of TOA Electronics A-903MK2, 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 A-903MK2.
However, one of the most important roles played by the user manual is to help in solving problems with TOA Electronics A-903MK2. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device TOA Electronics A-903MK2 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
