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I AM LOOKING FOR A CIRCUIT DIAGRAM FOR THE LEEM PRO AMPLIFIER SECTION
www.the12volt.com/ subwoofer wiring diagrams and then find out what ohm of sub u have and how many voice coils and what ohm your amp is stable at.
Posted on Jun 14, 2009
when I turn off and then Turn on after 10 minutes the TV notwork(by using remote or touch button). I try to disconnect power supply andthen reconnect and waiting a couple of minutes and turn on but no work (nosound and black desktop) .I repeat this procedure many times so some timework and sometimes not work. please help me to solve this problem
Posted on Aug 28, 2011
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Aug 03, 2016 | JVC Audio Players & Recorders
Wharfedale pro bx1360sd
I have had problems with this stereo mixer amplifier which had the symptoms of no sound output from either channel .
I opened up the unit and discovered that the amplifier was correctly amplifying my input signal up to a relay which switches the output through to the speakers .
This relay did not activate at all.
When the power switch is turned ON you should hear a click approximately 2 seconds later , if no click then there is a problem with the circuitry associated with this relay .
I traced out all the connections associated with this relay and made a circuit diagram .
The relay is a 24v relay and I will explain the way that I can see that this section of the amplifier works.
It has been designed to ;
This it needed because otherwise there is a current surge and sparks from the relay turning on immediately.
Q804 turns On Q805 which turns On Q806 to activate the relay .
Voltages on transistors
Q802 and Q803 2sc1815
Base 0V Collector 12.9V Emitter 0V
Base 12.9V Collector 0V Emitter 15.1V
Q805 2sc1815 (driver for Q806)
Base 0V Collector 7.2V Emitter 0V
Base 0V at Turn ON then after 2 secs increases to 0.7V
Collector 2.8V ( transistor is activated as a switch Turned Fully ON ( saturated) to turn on the Load which is the relay .
I have replaced the following transistors to fix my amplifier q805 2sc1815 and q806 2sc1815 .If you are going to use a different type of transistor it may not work and also the lead connections of a 2sc1815 for the collector and emitter are different to those such as on a 2n2222( transposed).
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