+ Reply to Thread
Results 1 to 10 of 10
  1. #1
    Join Date
    Jun 2005
    Location
    Warrington
    Posts
    172

    Default Grundig Radio Cassette - fixed

    This is just in case anyone else has the problem I had - I think it's fixed. Our 2001 450 came with the Grundig Radio Cassette, and it developed an intermittent fault whereby it just cut out. New speakers didn't help, and there was nothing obvious, no blown capacitors etc. Taking the cassette module out of the radio to look at the circuit board, I thought it was worth a try at leaving it out permanently, since I never play cassettes now, and it might be where the fault was... and the radio now works!

    I sometimes believe such devices are intelligent and deliberately wind up their owners. Before I did the fix above, I bought a used radio on eBay, which turned out to need a code. The seller refunded me but didn't want it back, so I set out to read the code, which is stored in the main processor chip, using the instructions on Evilution's site. After much faffing with previously retired XP computers, a Chinese programming device, solder, adaptors, error messages, all taking many hours, I finally managed to read the code - just as I concluded that the original radio, as above, was now working! So now I have a spare.

  2. #2
    Join Date
    Mar 2018
    Location
    sunderland
    Posts
    52

    Default Re: Grundig Radio Cassette - fixed

    I also have radios with lost codes luckily I already have an XP computer would you mind sharing your fix online with us.

  3. #3
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    653

    Default Re: Grundig Radio Cassette - fixed

    He said he got it from Evlution so it must be on there.

    FWIW it is not stored in the main processing chip it is stored in EEPROM.

    Lots of sites will tell you how to remove the small 8 pin DIL chip and read it then extract the PIN from it.

  4. #4
    Join Date
    Jul 2005
    Location
    over here
    Posts
    13,867

    Default Re: Grundig Radio Cassette - fixed

    Quote Originally Posted by Mjolinor View Post
    He said he got it from Evlution so it must be on there.

    FWIW it is not stored in the main processing chip it is stored in EEPROM.

    Lots of sites will tell you how to remove the small 8 pin DIL chip and read it then extract the PIN from it.
    Yeah thereís nothing special about it, or its method of storing the code, as you say, itís in a serial eeprom (a small 8 pin surface mount IC located close to main processor - itíll be a 24c08 or similar)

    For a reader https://www.ebay.co.uk/itm/24CXX-24L...kAAOSwuGhbvuPs
    Last edited by TheAlmostInvisibleMan; 5th August 2019 at 19:14.
    fq101.co.uk

  5. #5
    Join Date
    Jun 2005
    Location
    Lewes, East Sussex
    Posts
    602

    Default Re: Grundig Radio Cassette - fixed

    If you have to buy all the kit in order to get the code out of 1 radio - you might as well just go to a Merc dealer with your licence, V5 and radio serial number and get them to give you the code. Unless of course , you actually want to learn how to get the code from the radio for other reasons as well, like being able to do it for others? Or just for learning how?

    Each to their own, as they say.

    John

  6. #6
    Join Date
    Feb 2006
    Location
    Hampshire
    Posts
    1,113

    Default Re: Grundig Radio Cassette - fixed


  7. #7
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,098

    Default Re: Grundig Radio Cassette - fixed

    Quote Originally Posted by 137699 View Post
    Wrong link. OP does not have CD radio.

  8. #8
    Join Date
    Feb 2006
    Location
    Hampshire
    Posts
    1,113

    Default Re: Grundig Radio Cassette - fixed

    I wasn't replying to the OP - I was responding for Pocetsize.

  9. #9
    Join Date
    Jun 2005
    Location
    Warrington
    Posts
    172

    Default Re: Grundig Radio Cassette - fixed

    Apologies, I was away on 4th August and didn't notice the new posts. The link for the cassette radio is https://www.evilution.co.uk/1222

    I can now add that while removing the cassette mechanism made a huge improvement to the random fault, it did eventually fail, so I'm now using the decoded one.

    I didn't have the option of going to Merc with proof of ownership, as the radio that needed decoding wasn't original to my Smart.

    A few notes to add to the fix on Evilution:

    The mini CD with the Xprog includes a Chinese version of Adobe Reader. I assumed this was for Chinese customers to read the pdf manual but after much trial and error found that (on Windows XP) you need to install this, otherwise launching the Xprog Desktop results in "Access violation at address 005E5666 in module XProgDesktop.dll". I guess there are some dll files that the Adobe installer adds.

    I spent a while puzzling why the "Read" icon was greyed out, before realising you need to click "New" first.

    However, even after cutting the tracks on the circuit board to disconnect the Rx, Tx and Reset pins, I always got "Device is silent. Timeout error". I then tried soldering the wires direct to the MCU (tricky) or the next resistor (easy), with no change, and with and without the 'optional' connections. I aAlso tried using a 12V power supply and serial connection to the XPROG, which didn't help, then my XP machine with a serial port died so I went back to USB. Finally I followed advice on digital-kaos.co.uk to connect the MODB pin to GND on the XPROG, rather than connecting it to pin B4 as in the manual, and set the oscillator to 8664000Hz rather than 16000000Hz - I could then read the MCU without error. I suspect that cutting the tracks to lift the pins and soldering the wires direct were unnecessary.

    I didn't find a free source (dodgy or otherwise) for the V2.5.8 GEVA but instead posted the dump file and a request on the relevant forum on Digital Kaos and a Forum member kindly extracted the code.

  10. #10
    Join Date
    Jun 2005
    Location
    Warrington
    Posts
    172

    Default Re: Grundig Radio Cassette - fixed

    Quote Originally Posted by Mjolinor View Post
    FWIW it is not stored in the main processing chip it is stored in EEPROM.
    In the CD version it's in the 8-pin EEPROM. In the cassette version it's in the 68-pin main processor.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts