Question about Aiwa AWP-ZX7 CD Shelf System

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MY AIWA MINI COMPONENT NSX VC920 TR REGULATOR A1266 WHICH SUPPLY 5V TO MAIN CPU IS BROKE I REPLACE IT NOW SOME TIME IT SHOW PTS19 (WOULD BE PROTECT 19) AND SOME TIME SHOW PTS 20 AND THEN CUT OFF SOME CAN USE AUX AND HAVE GOOD SOUND BUT IF I TURN TO TAPE PLAYER IC 101 MAIN CONTROLLER TURN VERY HOT I THINK THIS CAUSE TR A1266 BREAKS (IT VERY HOT TOO) SO I USE RESISTOR 4.7 OHM PLACE AT EMITTER BEFORE THE CURRENT OF 5 V TO IC101 (THE DISPLAY CONTROLLER) AND USE 22 OHM AT COLLECTOR(12V GO TO THIS PIN) THE HEAT DECLINE BUT NOT GOOD SO I LOWER IN PUT VOLTAGE AT 220 VOLT BY PUT 220V 100WATT TUNG STAIN LAMP IN SERIES IT BETTER BUT NOT THE BEST ...HEAT STILL REMAIN I DONOT THINK C101 IS SHOT BECAUSE DISPLAY CAN SHOW DEMO PL PL SHOW THE SOLUTION TO PUBLIC I NOT SURE MY E MAIL ADDRESS STILL OK OR NOT

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Posted on Jan 02, 2017

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robotek
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SOURCE: aiwa mini-component

gidday mate... it does sound like a failure in the audio output stage. I suggest that you first check the speakers for short circuits as a fault here will produce a similar symptom you described. Check that you have the correct DC conditions about the STK, such as main power supply. Check all resistors that are in proximity to the STK, particularly lower value ones. Look also for shorted or dry capacitors about the output stages. Most of the audio signal path amplification is inside the STK and generally only a few millivolts of audio are provided to the input pins(usually the outermost pins). I have looked online for a data sheet on the chip that may be of help to you, but have not yet been able to find one. If the unit has soft touch electronically switched input selectors or electronic attenuator to the vol control, either of these IC,s may be faulty also. I am happy to keep going with this to help you fix it if you want. Give me a hoy back in here and I will :)

Posted on Jan 25, 2008

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