The board I used is this one: http://www.hvwtech.com/pages/products_view.asp?ProductID=223
You will need to connect a 12v supply directly though when you need to patch the OTP PROM location. The board has connectors for all the microcontroller pins so it is quite easy if you're handy with a solder.
You can use jbug11 under windows which has a nice interface, allows direct reading of the entire memory address space of the microcontroller, and to upload files to program it. http://freespace.virgin.net/john.beatty/Jbug11_main.html
You will need to connect a 12v supply directly though when you need to patch the OTP PROM location. The board has connectors for all the microcontroller pins so it is quite easy if you're handy with a solder.
You can use jbug11 under windows which has a nice interface, allows direct reading of the entire memory address space of the microcontroller, and to upload files to program it. http://freespace.virgin.net/john.beatty/Jbug11_main.html
I am facing the same problem on a KRC-3 preamp. Have been able to read the file, but cant seem to find the line with the loop instruction. Is there anybody who would try to take a look at the file for me, as I am not an expert - in fact a total newbie..
Could send the binary file to you, if you drop me a mail..
Thx
Anders
Could send the binary file to you, if you drop me a mail..
Thx
Anders
Try looking for either BRCLR / BRSET instructions related to reg 1000, or a CPY (compare) with the constant $925, as on page 13 of this thread.
Dont know how to write this without getting embaressed, but I cant even read the file - had someone else read if for me..
and since they charge by the hour, it will be a bit to expensive the have them do it for me..
and since they charge by the hour, it will be a bit to expensive the have them do it for me..
If you have someone charged by the hour reading out the eprom content for you to debug and patch, maybe you should just get an authorized dealer to do the modification for you in the first place?
I know - if the cost was not so high, I would do it immidiatly, however, there is also the issue, that I may return to the us one day and would like to be able to do so without paying for another change...
If an authorized dealer do the modification, they just put in a new microcontroller without any frequency check. The european models accept both 50 and 60 Hz.
If you have a binary copy of the eprom content, you can load it into jbug11 yourself and have it disassembled without any hardware of any sort. mailing it around might be a copyright infringement. You work with IT don't you? It's not voodoo.
Your right - do work with it, but not programming, and especially not hex or binary. Have never done anything like this.
Anyway, the file is basically empty, there are only a total of 60 lines with codes, so I belived it would be a pretty straightforward thing - only I cant find head and tail in it.
Anyway, the file is basically empty, there are only a total of 60 lines with codes, so I belived it would be a pretty straightforward thing - only I cant find head and tail in it.
same problem different model
Hello,
I have the same problem: get the Krell machine from US to work in Europe. The one that I have is Krell 300CD CD player. Does anybody know if this model uses the 50 Hz protection? There are 3 switches inside: SW1, SW2 & SW3 side by side in power supply block. Right now it works with 110V. The center swich is in the opposite position to the side ones (don't remember if the position is 1 or 2). Would love to hear how to switch for 240V.
Thanks in advance,
Tom
Hello,
I have the same problem: get the Krell machine from US to work in Europe. The one that I have is Krell 300CD CD player. Does anybody know if this model uses the 50 Hz protection? There are 3 switches inside: SW1, SW2 & SW3 side by side in power supply block. Right now it works with 110V. The center swich is in the opposite position to the side ones (don't remember if the position is 1 or 2). Would love to hear how to switch for 240V.
Thanks in advance,
Tom
Justforkicks
Changing it to 230V is pretty straight forward - just set all the switches to 2-2-2. But it wont help you as that mdel have the sniffer on 50/60 Hz.
So you can either pay a fortune for a Krell dist to change the chip or , what I would recommend, go look at audiogon.com and see if someone have a PS Audio P300 powerplant for sale.
If you dont know the unit, then quickly described it is a power regenerator, that converts the AC to DC and then back again to AC. The US model, will only create 115V, but it does have a switch internally allowing it to accept 230V as input. Now the beaty is that you can set the freq in steps between 50 and 120 Hz (90 on the older models) so that way you have a perfect power source for the Krell and it will work.
Best thing is that the sound improvement is VERY VERY big, pure power really makes a hell of a difference.
Downsides? Only one, it will use more power than the cd player alone (think +50% wattage) but since the cd is only 50 watts I am sure you can live with it.
You can read more on psaudio.com
PS: you should be able to get it for around USD 600 if you can live with an older model - so it sure beats the +1000USD most Krell dist takes. And then add the benefit of the sound on top.. Especially if you have more gear that can be set for 110V..
Best of luck..
Changing it to 230V is pretty straight forward - just set all the switches to 2-2-2. But it wont help you as that mdel have the sniffer on 50/60 Hz.
So you can either pay a fortune for a Krell dist to change the chip or , what I would recommend, go look at audiogon.com and see if someone have a PS Audio P300 powerplant for sale.
If you dont know the unit, then quickly described it is a power regenerator, that converts the AC to DC and then back again to AC. The US model, will only create 115V, but it does have a switch internally allowing it to accept 230V as input. Now the beaty is that you can set the freq in steps between 50 and 120 Hz (90 on the older models) so that way you have a perfect power source for the Krell and it will work.
Best thing is that the sound improvement is VERY VERY big, pure power really makes a hell of a difference.
Downsides? Only one, it will use more power than the cd player alone (think +50% wattage) but since the cd is only 50 watts I am sure you can live with it.
You can read more on psaudio.com
PS: you should be able to get it for around USD 600 if you can live with an older model - so it sure beats the +1000USD most Krell dist takes. And then add the benefit of the sound on top.. Especially if you have more gear that can be set for 110V..
Best of luck..
Hey people
I'm in the same situation - I have a 60Hz KAV300IL that needs to be modded to allow it to run in the UK.
I absolutely refuse to pay 550 pounds for those bastards at AS to do 30 seconds worth of work.
I'm willing to pay anyone who wants to program my chip to allow it to fun on 50hz a price of 150 pounds.
Let me know what you people think
I'm in the same situation - I have a 60Hz KAV300IL that needs to be modded to allow it to run in the UK.
I absolutely refuse to pay 550 pounds for those bastards at AS to do 30 seconds worth of work.
I'm willing to pay anyone who wants to program my chip to allow it to fun on 50hz a price of 150 pounds.
Let me know what you people think
Need Help !
Hello, scuse me for my very bad english !🙄
I need to fix a Krell 400 XI to 50Hz. I have read all the memory to desasemble the program data so Y have make a big error, I used a EEPROM talker and then I have delete the EEPROM Data off the 68HC711E9. Is anybody can supply me the data to write in the EEPROM memory ?
I noticed that the program include in my 400XI is slightly different from the extract presented in this forum ... Normal ???
Many thanks for your Help !!
Samuel😉
Hello, scuse me for my very bad english !🙄
I need to fix a Krell 400 XI to 50Hz. I have read all the memory to desasemble the program data so Y have make a big error, I used a EEPROM talker and then I have delete the EEPROM Data off the 68HC711E9. Is anybody can supply me the data to write in the EEPROM memory ?
I noticed that the program include in my 400XI is slightly different from the extract presented in this forum ... Normal ???
Many thanks for your Help !!
Samuel😉
Re: Need Help !
The 400xi surely has a different prom content than the 300il, since it has a different volume control.
I doubt very much that you're been able to erase the content of the PROM itself, so there is probably some configuration data in EEPROM that is erased. Can you check that the content of the EEPROM area is filled with all zeros?
samaudio said:
The 400xi surely has a different prom content than the 300il, since it has a different volume control.
I doubt very much that you're been able to erase the content of the PROM itself, so there is probably some configuration data in EEPROM that is erased. Can you check that the content of the EEPROM area is filled with all zeros?
Idly reading through this thread and noticed Huquin's post #137 regarding his Krell 400xi which seemed to power up fine on 110V 50Hz. Does this not suggest that the microcontroller senses the position of the voltage setting switches before it measures the frequency of the incoming mains? If its a product intended for the US market and sees 110V switch settings then it powers up with nothing further ado. If its a US product and sees 220V switch settings then it measures the frequency before starting up or going into an infinite loop. Possible? If so then a step down transformer might be all you need. Even a 3kVA monster will only cost in the region of £250.
Chalky
No, doesnt work that way (if only it did..) The unit will power up no matter what setting the switches are set to, however it will not complete its boot, and therefore you cant do anything with the unit..
No, doesnt work that way (if only it did..) The unit will power up no matter what setting the switches are set to, however it will not complete its boot, and therefore you cant do anything with the unit..
Re: Re: Need Help !
Hello ! I have read and desasemble the EEPROM data, and I found some data that content a program code, I presume that is the Talker I had loaded in this memory location...
What is the use of the EEPROM memory in this amplifier ???
Many thanks for your help !!
Sam
😉 😕
Hello ! I have read and desasemble the EEPROM data, and I found some data that content a program code, I presume that is the Talker I had loaded in this memory location...
What is the use of the EEPROM memory in this amplifier ???
Many thanks for your help !!
Sam
iampivot said:
😉 😕
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