Hello All-

long time reader, first time poster (one of those silent ones). site is killer and now I have become a bad addict to both the site and to boxes, boxes boxes...

i'm hoping someone can point the way out on my current problem.

my ebay aiwa 660 has a dead left channnel. no sound at all. cleaned all the controls well. dead in headphones, dead with inline. dead with radio. also tried an external speaker but dead. right side sound is beautiful.

the left VU meter does function with inline but not with radio or tape.

can't see any broken wires or loose connections on speaker but there is a godawful amount of wire in this thing!

any steps to working this out to suggest would be appreciated heartily.

( i haven't even got to the belts yet!)

thanks

(_________________________________)

The sound of my jaw dropping...

Me like!

Sorry, Im not a tech guy at all, but welcome aboard!

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Reply

hi welcome , i think you have a bad amp ic chip on one channel these are the chips that are mounted to the aluminum finned heat sinks on the amp pc board,i hope this helps.

hi guys- thanks for the replies.

jvc floyd- can the amp chips go bad from shipping damage i.e. dropped or tossed or do they just burn out?

the guy i got it from swears both channels worked when he shipped

if that's true, seems funny to just go bad when all of a sudden, but i guess that's the nature of these sexy machines...

thanks for the advice.

Love the avatar ! Welcome . . Yep , sounds like an amp chip issue . . We have a few very clued up members here so hang about and I am sure you will get the help you need.

Cheers Royal! Great to be here.

Hey guys I noticed something else with this. Looks like the panel with the in line was pushed in a bit and connections to the board were weakened, especially the left channel. Wondering if this could cause the loss of the left sound entirely? If so, is this a conductive epoxy fix or can i solder back on?

Really new to this but obsessed with fixing this. Thanks for the help.

Hope I added the pic correctly...

Welcome! Love the avatar! (Wait 'til Monolithic sees it! )

Conductive epoxy may work but I suggest a solid jumper. Or is there something on the other side of the board. Looks like it may be a simple repair. Take care of that right channel as well as it seems on it's way also.

thanks oldskool...
by the way, i am now a big sansui fan thanks to you. oh how i love my cp-99w

Not to get off topic, but when did you get yours?

about 2 months ago off the epay, arrived in some horrifying packing but survived. cheap too for such a sweet thing. but it was (is) filthy. i actually haven't even gone through it yet because i been blasting it everyday! you were right about the multidimension button...tasty

never see any other sansui boxes and i look pretty hard.

so when you wanna off load a cp-5 i will be here

If that left channel connection is loose all you need to do is resolder it. Check to make sure its not a component with a crystal ,heat will damage without a heat sink. Just heat it up dont add any solder

quote:

Originally posted by blah blah blah:
Cheers Royal! Great to be here.

Hey guys I noticed something else with this. Looks like the panel with the in line was pushed in a bit and connections to the board were weakened, especially the left channel. Wondering if this could cause the loss of the left sound entirely? If so, is this a conductive epoxy fix or can i solder back on?

Really new to this but obsessed with fixing this. Thanks for the help.

Hope I added the pic correctly...

thanks badbill, just warmed her up as you suggested and she stuck... still got my dead channel though

Sorry thought it might work . I had a loose connection on my input to a trc975 and when I resoldered it worked like a champ . Did you switch speakers???

haven't switch speakers yet... looks a bit scary, i picked a good (pia)box for my first major surgeries!

jvc floyd suggested a bad amp ic so i took a look, isn't visually blown but i did order a replacement just in case.

i will try switching speakers tomorrow, sounds better than doing my first ic replacement

lots o wires in these bad boys

thanks for all the suggestions from everyone, as always learning alot

welcome blah bb--
good luck on your repair venture.

your avitar has been submitted for 'stimulus package' funding.

works for me !!!

Thanks for the welcome redbenjoe...yes, it is somewhat hard to read the posts! i feel as though i know you already from reading your posts! always trying to off load low rent boxes, one of these 660's if i remember correctly

so i switched speakers and it's not a speaker issue, that right channel is still dead

i am going to keep this selfish thread alive as i am going to do surgery when i get my new amp ic and i need lots of advice! (good advice)

should i replace anything else while i am ruining it with that new amp chip???

just dont ever replace that hottie

that section is only the line in that would be the only thing effected you could glue that back down but there is a possibility that there could be a hairline crack which would not let it work so resoldering takes care of that for the dead channel there are a truck load of stuff that could cause that and yes the audio ic would be one but you have to make sure that speakers are working correctly,, look at the board if you see any visible crack in one of the traces around speakers connection,, remember it takes a well trained eyes to see that and it does happen and can cause grief bad balance control. volume control, bad switch or a half working switch even if you cleaned it all of those things you have to rule out before going in and replacing parts

dont worry redbenjoe she's staying.

thanks for the help ramon, i think you are right in that it could be a crack or something and maybe not the amp ic. speakers are fine, but it did take a good hit on that line in panel, enough to crack off one tiny clip inside the case. your advice is well taken about random parts replacements, will avoid unless i am completely stumped, and then still think twice.

good tough box and problem to learn on anyway!

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i feel as though i know you already from reading your posts

we still like you bbb damn nice avatar.

It's a miracle! Ramon you were correct, it was a bit of cracked circuit board. I cleaned it up and bridged the cracked circuits and like magic it has sprung back to life!

Thanks for everyone's help on this. some past posts really helped with the bridging issue.

This group is awesome. Now if I could just unload this pos.

AWESOME!!!!!! The CS660 is a great box,I've had two of them. Enjoy it....
Is the CS660 for sale?

quote:

Originally posted by blah blah blah:
It's a miracle! Ramon you were correct, it was a bit of cracked circuit board. I cleaned it up and bridged the cracked circuits and like magic it has sprung back to life!

Thanks for everyone's help on this. some past posts really helped with the bridging issue.

This group is awesome. Now if I could just unload this pos.

glad to hear that it is working dont you love that especialy the cs-660 which is one of my favorites..i just finished my sanyo 9994k which i found had a bunch of cracked solder joints the radio worked but it had a whole bunch of noises and sometimes only one channel worked my first impression was it needed all caps replaced but i dug into it with my jeweler head mount mag i could see a bunch of small cracks around a lot of the solder joints if you looked at it with your naked eyes could not tell so i resoldered the board done deal now it works perfect,, thats why i go the effort to check those board carefully just to make sure they are no visible bad or cold solder joint that there will cause a lot of if you know what i mean

yea skippy1969 the box has a very rich sound, nice and loud but still lots of depth. Not sure how the DSL button works but it's sweet. Still gotta get the belts changed though and i read here how fun they are! Gonna hold onto it for a while but let you know if i ever sell it.

Ramon amazing how tiny the cracks were a magnifying/ jewelers glass is a good idea for this stuff. from now on any problems i have will get a very detailed look at the board for sure, probably would have done major surgery without your advice