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Old 12th February 2009, 09:22 PM   #1
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Default fpb 300 voltage conversion from us to uk?

hiya guys. bought a krell fpb 300 recently from a guy from minnesota. this query is aimed at iampivot. i have the voltage changed from 120v to 240v, - fine, sparked her up, plenty of mechanical action, but no sound. The 60 hz cycle has to be modified to 50 hz, or to 50/ 60 hz, for unit to function. One byte/ line in the program needs to be rewritten, there is a routine stored in the ram to detect frequency. According to a topic posted in 2004 :

It works! Setting the address d3d9 to 0x00 fixed the amplifier

I have a competent computer programmer on board, but he doesn't know what this is all about. can anybody enlighten him?, any pointers would be much appreciated...
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Old 14th February 2009, 02:33 AM   #2
Fanuc is offline Fanuc  United Kingdom
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It sounds like it has a microcontroller or DSP or PIC of some sort and you either need to change the flash or (e)eprom code externally on a chip or built into the above IC's

Do you have a close up of the circuitry (don't bother with the caps, transformer and the like etc). Hi Res. photo

Send it too my email if it's too large I will find out for you. I need chip numbers. I think krell uses a sort of noise gate side chain for it's sliding bias. That will probably be controlled by this chip too! lol

Kevin
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Old 14th February 2009, 02:39 AM   #3
Fanuc is offline Fanuc  United Kingdom
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Quote:
According to a topic posted in 2004 :

It works! Setting the address d3d9 to 0x00 fixed the amplifier
Have you got a link to this post. See what I can pick up from it. Or maybe your questions has been resolved privately.
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Old 15th February 2009, 04:09 PM   #4
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thanks Kevin, if you can give me your email address, 'cos diyaudio.com won't let me contact you as I am a new member, and as such am still under moderation. all the best...
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Old 15th February 2009, 04:23 PM   #5
Fanuc is offline Fanuc  United Kingdom
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kevin_dabson_2 (@)hotmail.com - remove the brackets.

Have you a Hi Res pic or link to that post or both?

Kevin
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Old 5th December 2011, 01:00 PM   #6
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Quote:
Originally Posted by Fanuc View Post
kevin_dabson_2 (@)hotmail.com - remove the brackets.

Have you a Hi Res pic or link to that post or both?

Kevin
check out this URL:
cd-rom disc with KRELL FPB-300 & 600 , KAV-300i schematics for service repair | eBay
perhaps this can help.
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