Convert Krell 300iL to European voltage

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
A

AudioVideoNut

Member
Joined 2008
Hi Tor,

Thanks for reply. My unit is exactly the same as the photos posted by PS_Norway (same chip number as well) just different the third line (not sure, I'll check if you need it) i.e :

MC68HC16Z1VFC16
OH35S
ABCDXXXX1234

I managed to find the way to configure the wire connection to power up at 240V but don't know how to change it to 50HZ though...

If you can help me step by step how to do that, I'm really happy to donate a bit of cash for you to do further research and development :) instead of paying it for those greedy dealers here....

I've also sent email to Krell to feedback about this problem as well, because by the time I bought the unit, I checked it carefully and it did has the label 50/60HZ right under power button at the back at the unit. It means it should work on any frequency though... Otherwise it's a very wrong information for customer and Krell needs to do something about that. It like you buy a brandname car and on the gas tank it says using premium unlead/Unlead (premium recommended). So what the driver would think when he fill up with unleaded petrol and it does not run !!!!

Thanks for your help. If you need more detail and photos, let me know and I can send them to you.
 
I

iampivot

Member
Joined 2002
The same procedure applies;

1. identify the microcontroller, eg. take a photo of the PCB and post here.
2. find out how to connect to the microcontroller with a PC in development mode.
3. disassemble the microcontroller code to find the code preventing operation
4. burn path into microcontroller.

Step 2 - 4 requires a steady hand with development tools and some knowledge about electronics, so I'd recommend getting some help from people "in the know".
 
M

MaxKrell

Member
Joined 2008
Written on the chip:
AM27C010
-120DC
9925EPD V
C 1997 AMD


I try to put again the photo.
 

Attachments

  • chip.jpg
    chip.jpg
    86.7 KB · Views: 394
I

iampivot

Member
Joined 2002
Yes, that's the microcontroller, an MC68HC11F1CFN3. I think that one is similar to the one in the 300iL, except that it doesn't have any internal (E)PROM, thus the external one you've posted pics of previously.

I think the easiest path forward is to get the data off the eeprom, then get the program disassembled using a 68hc11 disassembler. That would allow you to find the entry point where the code needs to be patched. jbug11 is such a disassembler. You can probably find an eeprom programmer on ebay.

I can't really support you on getting the data off the eprom into your computer, or programming it, as I've never done this myself. Time to call in your local electronics guy.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom