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Old 7th March 2013, 10:45 AM   #81
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i would very appreciate if anybody could give a hint why Q32 has almost double voltage on collector

Q32 & Q12 have been replaced, C9 as well. Transistors haven't been shorted anyway, C9 shows 101nf as well.
R5, R4, R80, R81, R88, R89 are all fine too (even desoldered them to check).

I'm really stuck, it looks very obvious and simple, but if you are not skilled enough or haven't had a dozen of repairs, it's appreciably more complicated. I have specified collector and base voltages, emitter was used as a ground. The voltage in brackets is shown for the 2nd fine (I hope) channel.
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Old 7th March 2013, 12:10 PM   #82
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just to add that the output transistors Q40 & Q44 have been removed.
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Old 12th March 2013, 12:43 AM   #83
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Anyone?
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Old 15th July 2013, 09:16 AM   #84
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Quote:
Originally Posted by dtses View Post
i would very appreciate if anybody could give a hint why Q32 has almost double voltage on collector

Q32 & Q12 have been replaced, C9 as well. Transistors haven't been shorted anyway, C9 shows 101nf as well.
R5, R4, R80, R81, R88, R89 are all fine too (even desoldered them to check).

I'm really stuck, it looks very obvious and simple, but if you are not skilled enough or haven't had a dozen of repairs, it's appreciably more complicated. I have specified collector and base voltages, emitter was used as a ground. The voltage in brackets is shown for the 2nd fine (I hope) channel.

Vbe multiplier stage Q2 (for idle current adjust only for the output buffer) is not conductive or the cascode VAS stage (Q24+34) is defective/faulty (Q34 collector 0V !!!).

Last edited by tiefbassuebertr; 15th July 2013 at 09:19 AM.
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Old 16th July 2013, 07:01 AM   #85
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for the benefit of other readers and members who are trying to repair these nasty piece of metal chassis (I have no other words for Thule amps) with one of the worst pcbs I've seen in hi-fi gear (it is only better than 30 year old Philips CD350 I owned), check the pre stage and in particular LM chip that is responsible for volume adjustment. Mine Spirit had the fault there. Replacing the LM chip fixed the problem.
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Old 14th March 2014, 03:12 PM   #86
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Smile av120S

Hello !
I want repair my Sphere AV120S ..... but i don't find the service manual
i serch here but no : HiFi gør det selv produkter og tilbehør - Velkommen - sidekick-audio.com
to internet : no .....
somebody to help me ?
Sylvestre
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Old 14th March 2014, 09:11 PM   #87
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Join Date: Apr 2013
Quote:
Originally Posted by lechatmauve View Post
Hello !
I want repair my Sphere AV120S ..... but i don't find the service manual
i serch here but no : HiFi gør det selv produkter og tilbehør - Velkommen - sidekick-audio.com
to internet : no .....
somebody to help me ?
Sylvestre
two cards in av120
amplification : EM1250-2
processor : EM1260-2

but no schema to internet :-(
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Old 20th May 2014, 06:19 PM   #88
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Default Thule DVD 250B

Hello. Anybody knows how to repair it? On display there are strange dots instead info about tracks and it can't read CD. When I unplugg it for week it start working normally but after playing one or two CD it stops working again.
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Old 22nd May 2014, 12:59 PM   #89
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Quote:
Originally Posted by papapp View Post
Hello. Anybody knows how to repair it? On display there are strange dots instead info about tracks and it can't read CD. When I unplugg it for week it start working normally but after playing one or two CD it stops working again.
Look for any components on the power supply board that give the impression of getting warm in operation (voltage regulators in particular). These may have bad solder joints or may even have deteriorated. If you can find out who they sourced the innards from (anything on the PCB?), more information may be out there - I would not expect a relatively small company to build something as complex as a DVD player from scratch.
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