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Thread: P38A Clarion PU-9836A Service Manual

  1. #1
    p38arover's Avatar
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    P38A Clarion PU-9836A Service Manual

    I've put up a copy of the service manual/schematics for the early P38A Clarion stereo at: http://p38arover.com/rover/p38a/Clarion_PU9836A.pdf

    It includes part nos.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  2. #2
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    Oh my Ron
    Now you are really making me feel old.
    Seriously at the entire risk of boring the ass of anyone not so inclined to read further, i would like to explain.
    I know Ron at least will appreciate this read.

    In my long and now almost forgetten past, so past it seems like some previous life, i used to live and breathe Car radio electronics, just as i now do in the realm of vehicle diagnostics.

    I would spend hours on end pouring over such manuals as this you have posted Ron, and sometimes i would even take them to bed.
    I was single then though

    Now i know better. Isn't age wonderful

    It all started when i was an eager 18 year old. I was working as a junior in a Fiat dealership. As as i had a natural ability with all things electrical and electronic i found i was constantlty being asked to replace some quite nice OEM radios in both Fiats and other trade in makes with some after market rubbish.

    Me being me, yea you know who i mean Ron, i constanly enquired as to why, i must have drove my employers nuts, and eventually i was told it was because they did not have the codes for these OEM ones. Inquiring further as to the extent of the problem, i was shown a cupbord in which they kept the removed radios. It was full to the brim with stuff i would have loved to own.

    I offered to have a go at de coding these and was given an arm full of examples to experiment with. Well what did they have to loose.

    As this was an age before internet and even the PC as we all know it today was only in its infancy, i had to order loads of books on memory devices, wait for them to arrive and i read them cover to cover.

    Armed with this new knowledge i tackled a simple ford radio, no circuit diagrams were availible for Fords, but it had a distictly obvious 8 pin chip labeled MN010 showing a National semiconductors logo, which i suspected was really a National semiconductors MN9306 serial EEprom, which used a now common micro wire protocol.

    Using an IO card designed for my trusty ZX spectrum, i connected the various pins and wrote a program to toggle the communication lines to ultimatley read the small amount of data it contained. The first register i read 00 contained 4 values something like 4217. And sure enough, by luck, when i entered a code of 421 into the radio, it burst into life. It seems that the 7 was the attempts counter.

    The sucess inspired me to decode a phillips with another chip, I2C protocol (much more tricky) and much more common.

    Sensing a whole new career, i quit my job with Fiat, started my first business, enlisted the help of a profesional PC programmer and created my first saleable software package which was leased to outlets across the UK on laptops with my own specifically designed hardware interface. We figured out just about all the manufacturers, Phillips, Ford, Sony, Blaupunkt, Pioneer, Kenwood, Audioline, Audiovox, Becker, Clarion etc. At that time Clarions codes were set by the simple solder joining (bridging) or not of a series of pad pairs.

    The code base was always 1111 and the first pad pair would add 1000 or not, the second 2000 or not and so on. The maximum possible was only 6666 so there was only about 10 or 12 pairs.

    I was so astute and tuned at the time that as a party trick i could pull the back off a clarion, look at which pad pairs were joined and within a few seconds calculate in my head it's security code.
    These days i cant even remeber my wedding aniversary though.

    But what i can recall and that may possibly be of use to others here is that on later Clarions like the P38 one is that they fitted a Microwire serial EEPROM which they labelled S2430, however the sneeky gits used a version on which all pins were rotated right by 2. IE on an industry standard 9346 or 9356, pin one is Chip enable but on an S2430, Chip enable is actually on pin 3 and so on.

    So knowing this, it really is childs play to connect the S2430 epprom to any modern programmer and read its contents. Sadly i forget the exact registers that the code is in (I could look it up for the truly stumped though) but given that i figured it out over 20 years ago, it obviously ain't exactly gonna be rocket science.

    I note in your manual Ron that the identity of IC117 is deleted, althogh the diagram shows that the enable, data in and data out pins of this mystery (yea really) 8 pin device give it away as my old mate the S2430, so as i said, This post of your manual does take me back, much more than anyone else might have been and i truly do thank your for the trip chap.
    How do all you P38 owners generally get on with all the code malarchy these days anyway, i have been so out of touch since i have been into diagnostics.

    If there is still a need to decode these P38 Clarions i could probably knock up a windows program to do it with a simple enough electrical interface to something like a printer port etc?

    Nowadays i note that most car audio equipment has a security code which is derived from an algorythm of its serial number, and that manufacturers have much better traceabilty in place, so you can probably get security codes for radios etc via simple VIN number and proof of ownership, but it certainly was not always that way and i can but only hope that you enjoyed reading my own personal trip down memory lane. And whatever you do, don't put any radio in a freezer !!!
    Colin
    MD of Blackbox Solutions Ltd.
    www.blackbox-solutions.com

  3. #3
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    Clarion radio lock up, won't accept code?

    Hi all,

    After a long search I have just purchased my first p38 Range Rover, 2/95,low k's, nice condition, everything works except the radio.

    I am having a lot of trouble getting the radio code in. I have what I believe to be the correct code, 4443 (sourced from 2 separate dealers) but the radio won't accept it. It comes up "input code" then I hold band for 2 seconds, it displays _ _ _ _, then I input the code 4443 which stays on the screen for 90 mins then comes up input code again.

    I believe the radio has been repaired or replaced at some point, and Land Rover haven't updated their data base. There is a stamp on the deck circa 1999. According to them there is no way to get a code from the serial number on the head deck. They say, "get a new one."

    Can anyone tell me please is there a way of getting this deck unlocked??
    It is a Clarion PU-9836A
    The serial number is - CR0154X0036646.

    Any help would be appreciated.

    Jesse

  4. #4
    p38arover's Avatar
    p38arover is online now Major Part of the Heart and Soul of AULRO Gold Subscriber
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    There are a number of sites on the interweb thingy which can provide the code. Some are free, many are not.

    The decoder at: http://www.floodle.net/extra/ebayinf...io_decode.html has viruses in it.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  5. #5
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    Send me the last 6 of your VIN via PM & I'll cross check the serial number against what was originally fitted.

    Have you tried Clarion themselves?
    Scott

  6. #6
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    If your radio has been decoded by virtue of someone having re programmmed the S2430 serial eeprom chip, this might account for it having a code different to to any LR have on file for it. As such only anyone with the capability to connect to and read the chip in the radio can now tell you what its current / new code is.

    As an option, If you can get someone to de solder the chip (any old electronics place should be able to do this) and you send me the chip or the whole radio, i will take a trip down memory lane and pull out of archive the gear to do this for you. There won't be a charge other than postage.
    In fact it would be a pleasure.
    Colin
    MD of Blackbox Solutions Ltd.
    www.blackbox-solutions.com

  7. #7
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    Radio works!

    To all involved thanks, particularly BBS GUY for your generous offer to decode the unit.

    As suggested by Scouse, I contacted Clarion Australia direct. They advised me the unit serial number wasn't on file however for a small fee, $68 AUD including freight, they could decode the unit.

    I now have the unit back in and working. The code is different to the code Landrover have on their file.


  8. #8
    p38arover's Avatar
    p38arover is online now Major Part of the Heart and Soul of AULRO Gold Subscriber
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    Get LR to update their records. Maybe Scouse can do that for you.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  9. #9
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    Code needed for Clarion PU-9836A

    Please help with getting radio code, just paid $20 for a code that didn't work

  10. #10
    p38arover's Avatar
    p38arover is online now Major Part of the Heart and Soul of AULRO Gold Subscriber
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    Go to a LR dealer with your VIN. He should be able to get the code from their system.
    Ron B.
    VK2OTC

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

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