Question about Aiwa AWP-ZX7 CD Shelf System

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Aiwa mini-component it has low level of sound even it reaches the maximum level of volume control.but,if you use the aux input with other cd player with its own volume control my aiwa mini-component sounds loud. I think it has a low audio signal passing thru the main amp..or the main amp has leak?main amp IC is: STK490-110. how can i fix it to have a better gain level. before,level 20 of volume control is good enough...but now,level 20 is too poor in terms of audio level. anyone know how to fix this problem???

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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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I had a problem same as this before. I just put a jumper from a transistor to transistor. ( its been almost a year & half, ) I was checking at the drivers (input from aux, cd, tape, fm/am output signal) with my tester and sudenly I conncected my testprodes to 2 transistors and came out with a loud . which is before it was like chattering.

if the STK have a leakage then all your input signals are having same problems.
I guess its in the preamp section. give it a try to check and resolder some part.

Posted on Jan 25, 2008

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DEAR

I UNDER STAN YOUR PROBLEAM VERY WELL,
PL CHECK FOLLOWING POINT'S

CHECK MUTE SIGNAL PATH WITH YOUR MAIN AMPLIFIER
CHECK MAIN AMPLIFIER STK BY REPLACING IT
CHECK MAIN SPEAKER'S.
CHECK BIASING CIRCUIT WITH STK INPUT
CHECK HEAD PHONE CONNECTOR BECAUSE IT GIVES OUT PUT TO MAIN AMP.

THANK YOU

Posted on Jan 25, 2008

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