AKAI Stereo Integrated Amplifier Model AM-A1 - I need to replace the IC STK-4141 Version-II. Few of the capacitors are bloated. I need a circuit diagram so that the value of the components are correct. Otherwise, the new IC might get short circuited. Where can I get the circuit diagram? The set is 20 years old. Are there any refurbishers for this in India?

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

a fuse gone to the speaker terminal of the end amplifier.
There are four lots steering and power transistors or only an integrated powerpack ic to find possible IC in one or in 2 pieces .... can be defective. final stage amplifier is almost always to find on a large heatsink or the cabinet with transistors, or MOSFETs or a one large STK ic they are almost always short-circuited if defect and it is easy to find if defective with a multimeter as it are conventional vintage simple NPN and PNP transistors, it may be that if you have a multimeter ohm sets and measurement performed no resistance is given on the three legs ie the shorted than you the transistors mosfets or sometimes replace an IC output stage 1 or 2 pieces, but do not forget or bad bulging capacitors are responsible or that there was an overload or shorting a speaker cable that has become trapped in the door or a cabinet.
Much options to suggest in case of no sound or only loose connection by shifting a carpet

Any fuse blowing is a sign of a short circuited power transistor, IC, or other semiconductor device.

Usually is a capacitor or diode blown open up the amp and look for any burnt marks on the motherboard

hi ,thats is your convergence circuit is defect,you got 2 integrated circuit call
STK 390-xxx the ic # are depend of the tv chassis model number,
they got to be replace whit new one/ the component arround the ic like resistor ,capacitor
and some time 2 transistor for the minus 25volt,and plus 25 volts
some time you replaced just the stk ic and its ok,anyway taht have to be trouble shoot
if you know a good tech its will be better, or if you have some experience whit this ok
that is an hour job about to verify the circuit component near the ic like some low value resistor
.thats all i can do from here....
hope that give you an idea and have a merry christmas
regards : Alan tech for hitachi ...

my aply is AM-A1 I nee play by d. c. volt i can how much d. c. volt

If you can't find a free one and don't mind paying, I recommend Manuals In PDF. I have used them several times they are good company.

the lack of sound is likely due to a defective audio output amplifier integrated circuit or IC for short, it needs replacing, the wavy lines through you picture is due to a defective filter capacitor in your power supply circuit, or may be due to the audio amplifier I.C drawing more current from your power supply causing a non clean power to be supplied to the video circuits, have the audio amp replaced first and note if the wavy lines are still present if so it is likely that some filter capacitors need replacing, to obtain sound you might be able to connect a external amplifier like your home stereo using the aux input and the sound output from your TV`s RCA jacks, this works well, let me know if you need further assistance good luck

If you found a bloated capacitor on the circuit board, that one needs to be replaced not the board. You can see the part number on the capacitor itself. Also please look for any burned IC and neighboring components. If you found additional burned components, it also need to be replace. Contact a pro tv technician to replace it.

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