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Toa 912A PA Amplifier protection circuitry locked on. Why?

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  • notlih Dec 09, 2008

    This could be on the right track as I have found a transistor and adjacent resistor getting hot very quickly. They are on the main board so I shall remove it for inspection.

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Hi,
W-912A Mixer Power Amplifiers have a built-in
one-octave graphic equalizer with 9 bands to tailor sound
system frequency response to room acoustics, reducing
feedback tendencies and improving intelligibility. A built-in
compressor circuit is provided to protect the output level from
distortion as a result of excessive input and keep it constant.
The compressor’s threshold level can be adjusted. The W-912A Mixer Power Amplifiers have output terminals to
match 4- or 8-ohm speaker systems, or a speaker distribution
system may be connected to the 25 or 70-volt terminals. User’s
(blank) space is provided for additional functions to be made
by the customers. The expanding kit (optional) may be loaded
in this space when the number of inputs is increased.
Protection against tampering is assured by means of a keylocked hinged door. The W-912A can be
mounted in any four-inch wall with use of the BX-9F Flush
Mounting Back Box. Wall mounting is also possible with use of
the BX-9S Surface Mounting Box.

Good luck

Posted on Dec 09, 2008

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There is a short circut in the unit check wires and solder joints! somthing is touching somthing it should not be!

Posted on Dec 09, 2008

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Related Questions:

1 Answer

Power light is lit, but there is no sound coming from the speakers , it was working fine and just stopped working ?


Its an PA amplifier and i think this is build with an integrated powerpack IC output stage,
There are different TOA amps but if this model look first the fuses if that are (important)measured defect give a new fuse a try if it blows again there is something wrong in the cables or a speaker conection or filter , ut if the fuses are good there could be an single great brown or black colored IC with STK (....)A or B or something similar is to read on it on the great heatsink inside the amplifier that could be having 15 or more legs must be replaced , BUT also some capacitors thats belong to the output stage because every defect is having a cause.
It think this amplifier IC should similar be looking like this
26253047-nwnvuahhhrjrcsufn1cxvexd-4-0.jpg

Aug 05, 2016 | TOA Electronics - P-924MK2 - 240 Watt...

1 Answer

My toa a-912mk2 amp does not work and the red protect light stays on


• Check for shorted power transistors, and extract in pairs.

If it powers up, without protect..


• Check again for possible additional components before replacing

the bad ones.


A good amp never produce an over of 0.7V on its output.

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1 Answer

I have a TOA 301 15W amp and a Bose 151 environmental speaker(40w 4 ohms). I do not have a manual for the amp and wish to connect the speaker as a small PA . My concern is that the output I think I should...


Don't worry about the 7.7 volts. Just connect between COM and 4 ohms and you'll be fine. I didn't find a 301 part number related to a 15w amplifier, but I did find a BG series (115 130) of 15 watt amps manual http://www.toa-products.com/international/download/manual/bg115_mt1e.pdf

Carl

May 08, 2011 | TOA Electronics Audio Players & Recorders

1 Answer

The protection light is lit as stays lit and i have no sound coming out


if the protection light is on its an hardware failure
the protection unit will not let you power on the Amp
need to take to service
if you want to fix the amp let me know
ecrdn@yahoo.com

Jack

Oct 18, 2010 | TOA Electronics P-924MK2 Amplifier

1 Answer

What does it mean when the red protection light illuminates


Hi the protection light comes on when there is a problem within the amps. circuitry. Generally speaking the protection light normally comes on when powered up while the amp checks all of its voltage rails so that they all lie within a specific tolerance, when all have been verified to be in spec. then the protect light goes out & the power light comes on. If the protect light stays on then a fault exists within it's circuitry. Cheers, acbva.

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1 Answer

MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.


Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Oct 13, 2008 | Audio Players & Recorders

1 Answer

CSI Pa Amplifier with Am/Fm digital tuner p30a


The output section has a problem which is detected by the circuitry and the entire unit is in "protect" mode. This mode effectively shuts off the output. If you don't have electronics repair experience, I'd suggest that you bring this unit to a service shop. Expect a parts cost in the $25-$45 range.

Dan

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