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Toshiba RT-S90


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#1 docs

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Posted 02 August 2011 - 11:13 AM

Got a problem with what I think is perhaps a cleaning issue but not sure.

Radio function is good though there is no FM Stereo, I can get the light to flicker on when moving the siwthc between AM and FM quickly.

The deck function just has loud static noise, can't hear a tape playing above the static noise but the functions on the deck do work.
I've tried cleaning the headpohne and mic sockets, the line in sockets, the little switch in the power inlet and all control sliders and knobs but none of them have any affect on the level of static noise ie: it doesn't go louder or quieter at all. The mode switch has has a hugely thorough workout with switch cleaner.

When I got it the deck was stuck in play mode with the heads engaged but a little steady work freed them and they work as expected now with the press of a button. I've changed the single belt this deck has. Since this is a logic deck there is no record bar to clean either :dunce:

Not sure where else to look ?! Anyone know about a schematic ?

#2 monchito

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Posted 02 August 2011 - 01:49 PM

well the fm strereo can be adjusted on the pot close to the multiplexer ,,the other problem not sure as this is a japan only box :-) :-) :-)

#3 docs

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Posted 02 August 2011 - 02:08 PM

FM Stereo light now working thanks.
The deck has me beat for now.

The Light under the ADRES sign is knackered. I recall seeing a makeup by Norm and wondered if the lamp there is actually a light and not an LED is it seems to have a green rubber over it but its not a standard looking LED.
What should I replace it with ?

#4 docs

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Posted 03 August 2011 - 07:45 AM

I'm guessing that since the lamp is not an LED but a general lamp/bulb that the power is AC but I'll check that out tonight when I get home.

Would anyone happen to know where to get a schematic from for this wonderment !?

#5 monchito

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Posted 03 August 2011 - 12:41 PM

docs the lights are just regular lamps but bayonet style ,,i belive the sanyo 920 uses this type of bulb also ,, the schem is going to be the hard part unless someone has it or u are able to find it online even thou u might have to pay for it.... :-/ :-/

#6 docs

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Posted 03 August 2011 - 01:08 PM

Gotta say this one is frustrating as hell. The deck is the same after thorough cleaning of pots and switches etc. now it auto stops too :sad:
Thanks for the info monchito, I managed to find them under axial lamp now I just need to know the voltage which I think is 12v.
I tried my usual website where I've bought schematics from before but they didn't have it.
Will look around but this one might be up for grabs :hmmm:

#7 monchito

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Posted 03 August 2011 - 01:48 PM

docs they are a bit complicated i worked on one a long time ago,, i belive it was the motor which was spinning out of control ,,since these are 2 motor drive the main one was at full blast no way to slow it down did not have the schen ,,so what i did was replace the motor for one i could adjust speed on the motor and that took care of that... :yes: :yes: :yes:

#8 docs

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Posted 03 August 2011 - 02:05 PM

Thanks again monchito, seems like the autostop was intermittent and I think due to years of lack of use. The motor on this deck is adjustable but for now it seems to be playing ball.
It is looking increasingly like the white noise when on tape deck function (it doesn't happen on any other function) is a component issue though I will continue cleaning the switches etc. and i'll check the line in section for any dry joints.
Though whatver it is, is not common to all functions but only happens on the deck function, its the same through headphones :hmmm:

#9 docs

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Posted 04 August 2011 - 10:58 AM

The good news is the light has been replaced and it looks great !

A really good cleanup of the knobs and switches and generally the outside case and it'll be ready for a photo :thumbsup:

Still having an issue with the deck and static noise. :thumbsdown:

#10 docs

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Posted 04 August 2011 - 12:28 PM

Bedlam !!! :thumbsup: :thumbsup:
Thought I'd show some pics ...

In bits...
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Some more bits...
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The top section...
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The tape deck section...
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Transformers summat or others in disguise...
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The front casing...
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Taking a bath...
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You can just see how dirty this was but seems to be coming quite clean...
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#11 redbenjoe

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Posted 04 August 2011 - 03:12 PM

so well worth the big efforts -- :yes: :yes:

#12 docs

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Posted 04 August 2011 - 03:16 PM

just hoping I can repair the deck, can't find a schematic anywhere though :sad:

#13 monchito

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Posted 04 August 2011 - 03:24 PM

:agree: :agree: :agree:

#14 skippy1969

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Posted 04 August 2011 - 03:31 PM

The deck on the S90 is a PITA........... :thumbsdown: :thumbsdown: :annoyed: :nugget: :sick: :blink:

#15 monchito

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Posted 04 August 2011 - 03:37 PM

that was the biggest problem with boxes that u cant find a schematic, :sadno: :sadno: :sadno: :sadno: but u said that it plays tapes but has noise or no play????

#16 docs

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Posted 04 August 2011 - 03:40 PM

Yeh it plays the tape no problem but all I am hearing is static noise, just like a radio band that is not tuned in, can't hear any music from the tape.

#17 skippy1969

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Posted 04 August 2011 - 03:53 PM

Yeh it plays the tape no problem but all I am hearing is static noise, just like a radio band that is not tuned in, can't hear any music from the tape.

Maybe it is playing music on cassette,but you have one of the switches in the wrong position. :angelic: :hmmm:
After all the labeling is in Asian... :yes: ;-)

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#18 blu_fuz

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Posted 04 August 2011 - 03:56 PM

Looks like a lot of work! well worth it though.

#19 docs

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Posted 05 August 2011 - 02:06 AM

Thanks guys and skippy1969 for the pictures.

I have the function switch on the lowest setting which is tape deck and leave the band selector setting on FM.
The rest are a mixture of recording level and tape type selection among others.

However, as soon as I place the function on tape deck that is when the white noise occurs, it is constantly there not just when playing a tape.
Though oddly, when recording the white noise disappears and it does record but with play the white noise just continues.

Line in works as does radio perfectly and the function switch does not affect the white noise after cleaning or flicking and tapping the switch so I'm pretty sure its not the switch.

What I find a bit odd is when in tape deck function and the band selector switch at the top I get radio!?

#20 alfie

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Posted 05 August 2011 - 03:41 AM

I hope you work it out Dave, it looks like it's going to come up beautifully.

For 8 quid I think it's buy of the century. Now, GET IT GOING!!!!!!!!!!!!!!!!! :thumbsup: :thumbsup:

#21 docs

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Posted 05 August 2011 - 10:52 AM

Yeh it plays the tape no problem but all I am hearing is static noise, just like a radio band that is not tuned in, can't hear any music from the tape.

Maybe it is playing music on cassette,but you have one of the switches in the wrong position. :angelic: :hmmm:
After all the labeling is in Asian... :yes: ;-)

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Thanks for the pics, I have a feeling it is something to do with the adres switch, when i switch it between the three I still get static noise but it does change between settings.

#22 BMoney

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Posted 05 August 2011 - 12:48 PM

Yeh it plays the tape no problem but all I am hearing is static noise, just like a radio band that is not tuned in, can't hear any music from the tape.

Maybe it is playing music on cassette,but you have one of the switches in the wrong position. :angelic: :hmmm:
After all the labeling is in Asian... :yes: ;-)

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Wow where'd you find those pics Skippy? :w00t: I posted those years ago on the other site. Couldn't find them on my computer. :lol: There is a 3rd pic of the left ADRES side with the power/standby switch. :hmmm: You have that one too?

#23 skippy1969

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Posted 05 August 2011 - 05:50 PM

Yeh it plays the tape no problem but all I am hearing is static noise, just like a radio band that is not tuned in, can't hear any music from the tape.

Maybe it is playing music on cassette,but you have one of the switches in the wrong position. :angelic: :hmmm:
After all the labeling is in Asian... :yes: ;-)

[ Image ]
[ Image ]

Wow where'd you find those pics Skippy? :w00t: I posted those years ago on the other site. Couldn't find them on my computer. :lol: There is a 3rd pic of the left ADRES side with the power/standby switch. :hmmm: You have that one too?


I don't remember where I found the pictures Bmoney,I've had them for quite a while now.
Sorry I don't have one of the Adres side though......... :sad: ;-)

#24 docs

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Posted 07 August 2011 - 11:40 AM

With a lack of a schemtic I have gone ahead and ordered 2xTA7137P in a hope that those will fix the issue.
These IC's are PRE-AMPLIFIER(RECORDING OR PLAYING-BACK WITH ALC TRANSISTOR FOR TAPE RECORDER).
Fingers crossed.

#25 alfie

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Posted 07 August 2011 - 03:43 PM

With a lack of a schemtic I have gone ahead and ordered 2xTA7137P in a hope that those will fix the issue.
These IC's are PRE-AMPLIFIER(RECORDING OR PLAYING-BACK WITH ALC TRANSISTOR FOR TAPE RECORDER).
Fingers crossed.

Best of luck Dave. She really deserves to be brought back to life. She's a beauty of a boomer

#26 docs

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Posted 07 August 2011 - 06:19 PM

Thanks alfie, it's in above average condition but not perfect. It seems that a lot of Japanese boxes have pitting on some of the chorme and on the buttons and knobs, a common factor I guess of those boxes and how they use(abuse) them.
However it sounds absolutely sweet.

#27 docs

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Posted 09 August 2011 - 10:41 AM

I replaced two of the PRE-AMPLIFIER IC's today with no luck. Same result.
This one will be saved for another rainy day. :annoyed:

#28 docs

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Posted 21 August 2011 - 01:06 PM

Does anyone even know if an english schematic exists for this box ?
I'm not gonna be able to fix this without it :sad: :no: