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I have an Armstrong D4100 amp. Armstrong offers no support, parts or drawings for this model. In the unit, in the power circuit, I have an IC chip that is burned. I cannot id the chip. The board location is IC901. I am looking for schematics for this unit, or an ID on the chip.

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  • duane_newell Jul 17, 2009

    The part I amlooking for is on the power board. The chip has 4 pins on one side, and 3 pins on the other. I found the top of the chip that was blown off in one piece. IC109 labeled as follows:
    The logo looks like a thick I.

  • Rommel Cana
    Rommel Cana May 11, 2010

    hi, can you give me more description about IC901? how many pins does it have? is it part of the output stage? is it part of the power supply? if it is part of the main amplifier then , try to look in the other channel , if that part is common to both the 2 main amplifier, i presume it is part of the power supply. if you could possibly identify what stage that might be, might help I'm still looking for your schematics, but no luck yet, still looking


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SOURCE: Looking for circuit schematic for a Teac AG-7D.

This unit has detected a problem in the output section and the protection circuit is preventing the output relay from turning on. In most cases this is due to shorted output transistors which will need to be replaced. If you have a multimeter, set it to read DC volts and measure the voltage on the three legs of one of the output transistors. You should read .6V, 40V or so and 0.0. I suspect that you will read 40V on two fo the three legs. If so, that is your problem. Please note that the actual reading for the higher voltage may be something other than 40. I don't have the service manual for this model, so I don't know the exact voltage. It will be anywhere from 35V-75V depending upon the actual design and output transistors.

I am not aware of the availability of schematics for this unit, but any shop that works on audio gear should be able to repair this without them.


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SOURCE: InFocus LP540 Power Supply Problem

most of infocus parts are oem and made by a company in taiwan that no longer makes power supplies, and many of the parts have their stock numbers and not neccesarily a common stock. the power supply, however, is in stock at infocus for about $65.

Posted on Jul 17, 2009

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