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Sony FH-909 In Brisbane


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#1 bwana

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Posted 28 July 2017 - 10:53 PM

Hi

I picked up a Sony FH-909R the other day.  It needs some work - more than what my meagre skill level can offer.  Does anyone know someone in Brisbane (QLD, Australia) that might want t take a look?  Issues are:

 

- The amp powers on (some of the lights come on), but there's no sound.  You can hear the speaker protection relay click, but can't get any sound. The switches won't change the source and the spectrum analyser doesn't light up (could be just the bulb??).
- The tape deck also powers on, but has a lot of trouble opening (uses a motorised loading mechanism - with some coaxing, it will open and close).  Once the tape is loaded, you can hear the mech trying to engage, but I suspect the belts are dead. 
- The general cosmetics suggest that it's spent some time somewhere damp - the cabinets are rusty in places and the screws show corrosion.  The power cord also doesn't look to be in great condition and I think this should be replaced.

 

Any suggestions would be appreciated.

 

Liam

 



#2 davebush

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Posted 29 July 2017 - 12:33 AM

Hey Liam...check this link out      https://www.eevblog....-repair-advice/

 

I sometimes have to tap my amp on the top or side to get the volume to start..(pain in the ass)

 

deck is most likely belts....if the heads are still engaged, it wont open....

 

I have one these and they need servicing with lube etc etc

 

bulb is likely the no display thing....from what i can remember its 2 x 24v in series but im not sure



#3 Rimmer36

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Posted 29 July 2017 - 01:25 AM

I have a boxed one thanks to my friend Dave bush....although it worked when i had her from dave...it took a year to fully fix....it will need new relay switch..had mine from china new bulbs and possibly a new amp still available...my amp blew because of the faulty relay switch....a total pain in the A$$ but well worth the effort..good luck...ohh and she had lots of dry joints common with sony...but this is easily the best box in my collection, I was lucky as I have a top notch engineer, otherwise it would have more than likely gone out for the rubbish



#4 bwana

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Posted 29 July 2017 - 01:36 AM

Hi Dave and Rimmer
Thanks, i read through that link - sounds like a common issue. Just not confident to do the work myself. Open to any suggestions around Brisbane to take it to...

Thanks
Liam

#5 Rimmer36

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Posted 29 July 2017 - 01:41 AM

we are in the uk, so not sure where you can take her to liam sorry but this is a big forum so you may find someone, good luck



#6 bwana

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Posted 29 July 2017 - 02:47 AM

Thanks, despite my lack of skill, whacking the top of the amp led to the spectrum analyser working again and it will now allow me to change the input (cd, tape, whatever). Still no sound though, but progress nonetheless.

I also noticed that the amp board looks kinda brownish. The other boards look green..? Doesnt seem right to me..??

#7 Rimmer36

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Posted 29 July 2017 - 05:55 PM

Something else i have rmembered Liam...this has 2 relay switches, one for the power and one that if it isn't working cuts out the sound, this is the one you will need to replace :-)



#8 bwana

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Posted 29 July 2017 - 11:45 PM

Yes, i popped the top off and saw them both. Im assuming the culprit is the one on the amp board?

#9 Rimmer36

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Posted 30 July 2017 - 11:58 AM

the culprit is the one with the see through cover sunshine, yes I think it's on the amp board but I can't remember



#10 National

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Posted 04 August 2017 - 06:33 PM

STK41 series... is there signal at pins 1 and 18?

#11 bwana

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Posted 05 August 2017 - 10:42 PM

Hi,

Sorry, I've reassembled and not confident I have the skills to diagnose.  If you give me a little more info, I'm willing to try again next weekend?



#12 bwana

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Posted 01 September 2017 - 08:47 PM

Well, I've made some progress... we have sound and replaced the lamps that illuminate the spectrum analyser. The capacitor that stores teh eq memory needs to be replaced.  One thing that does have me stumped is the left channel in for the cd player.  No sound at all.  Contacts cleaned and all looks fine visually.  Right channel works as it should.  Phono input works fine on both channels.

 

...any thoughts?