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RCF AS6001 amplifier schematics needed

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kedwardsleisure View Drop Down
Old Croc
Old Croc


Joined: 20 January 2009
Location: Staffordshire
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Points: 3907
Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2017 at 8:11pm
its called work!
K. Edwards Electronics Engineers

North Staffordshire

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DjLeco View Drop Down
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Joined: 21 April 2009
Location: Bucharest
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DjLeco Quote  Post ReplyReply Direct Link To This Post Posted: 10 April 2017 at 12:47pm
Fixed today, thanks for schematic, my friends!
 

 

CLONES low cost half output trannies!

 

Replaced all BC-trannies on both output modules, 4 MJE 340-350 and 2 NE5532, recalibrated bias, all like new!

For those ones who will fix this kind of amplifiers in the future, if channel stays in protection mode even ALL components are OK, go on basic control motherboard, and replace 150kOhm resistors R60A and R60B with 82-100kOhm resistors at 3 watts.

 

It took me 2 days to realize as the prepolarisation current for constant curent generators BF87x was too low (too big value resistor, 150K ) to activate leds, as constant voltage source... AngryAngryAngry 

 

 

 

 

 

 

 

 

 

 

 

 

 What's inside a clone, compairing to the originals ON Semi... Bull$**t.

 

[video]https://www.youtube.com/watch?v=Q4CerRqF-XI&feature=youtu.be[/video]



Edited by DjLeco - 10 April 2017 at 4:18pm
I'm A Stupid SMART Romanian...
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M4trix View Drop Down
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Joined: 23 June 2009
Location: Croatia
Status: Offline
Points: 282
Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2017 at 7:56pm
Well done @Leco ! As for the transistors, I'm not surprised at all. Fake is written all over them. The logo still boggles me. Never seen it before and I doubt it's from China. Ouch
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