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View topic - cx985 mod

cx985 mod

This forum addresses questions on installation, configuration and troubleshooting you might encounter with your Sony DVD player.

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by ellisr63 » Tue Jan 24, 2006 8:44 pm

I have searched and found in the threads some info on flashing the eprom and adding rs232 cabability... I need to get more detailed info so I can convert my cx985 changers and gain the rs232 port for control...If anyone has this info please let me know. I think mine is one of the newer cx985 units so I will be replacing the prom with a 777es eprom too (unless that isn't required for the rs232 port to work).
tia,
Ron

followup:
I got into service menu on both changers..

changer #1

rom 1501
version rom check sum=881f
model type=00
eeprom check
nand flash check=inferior block 0050A000

Changer #2

identical except...
nand flash check=no inferior block


I take it that this means that #1 would just require a flash and the serial board mod and #2 would require the 777es eeprom and the serial board mod? Is this correct?

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by jehill » Wed Jan 25, 2006 2:36 pm



Are you talking about a mod that adds an RS-232 connector, because I don't see one on the player.  If so, I am unaware of such a mod.
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by jehill » Wed Jan 25, 2006 3:00 pm

Ok!  Now that I have read the other thread, I understand what you want to do.  Its a bit pricey, but one option that you have is to purchase the DVP-CX777ES RS-232C BOARD, COMPLETE for $93.11 here.  Just search for Part or Accessory Number a4733703a.
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by ellisr63 » Wed Jan 25, 2006 5:21 pm



Thanks for the info..A friend of mine said he would do it for me.....I've been trying to get a hold of Surgeon to find out what the parts list is (from the other thread it appears it's only $10 in parts for each changer). I have the manuals now for both units. From what I understand even once you are done you need a firmware mod (in addition to the flash) to get 100% functionality. Hopefully someone who has done it will respond with the needed info.

Ron

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by jehill » Thu Jan 26, 2006 11:04 am

You probably skipped over it before, but if you start reading here, it appears that the solution is to purchase and install IC106 for the DVP-CX777ES, Part No. 680347701 available for $55.52 here if you live in the US.  Just search for Part or Accessory Number 680347701.
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by ellisr63 » Thu Jan 26, 2006 4:55 pm






On 2006-01-26 15:04, jehill wrote:
You probably skipped over it before, but if you start reading here, it appears that the solution is to purchase and install IC106 for the DVP-CX777ES, Part No. 680347701 available for $55.52 here if you live in the US.  Just search for Part or Accessory Number 680347701.


Thanks, Now I just need the firmware update and the mod to the firmware that Surgeon made to get the rs232 port to work. Still no responce from Surgeon yet. Hopefully soon or ...hopefully someone else will have the modded firmware.
Ron
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by Surgeon » Fri Jan 27, 2006 4:58 am



The nand flash check/inferior block count has nothing to do with determining if the unit's main system eeprom is flashable or not . The nand refers to a totally separate flash memory chip where the disc title data is kept. An inferior block just means that part of this storage area is marked as bad/unusable, similar to the bad sector marking on a computer's hard disk drive during formatting. Some units have a few of these 'bad sectors' while others don't...

The only real way to tell if CX-985V has a flashable eeprom (aside from trying the flash upgrade procedure and verifying that it has new firmware afterwards) is to remove the main board and look on it's bottom side for IC106 and compare it with the pictures I posted on the bottom of this page (I've updated the links):

http://www.agoraquest.com/viewtopic.php?topic=13878&forum=50&start=90&select_page_number=10

As long as you have a unit with a flashable eeprom it can be mod'ed to the same rs232 abilities as the CX-777ES fairly easilly by someone with moderate electronics soldering skills.
 
If the rom is of the non-flashable type, your friend must have very advanced skills working with surface-mounted chips... Replacing the IC106 rom chip with the one jehill reported above for the CX-777ES is not for the faint hearted!

In any event the first step is to make sure you can flash upgrade your units as described in the other posts on this board. If you get that step accomplished successfully let me know as it's been a while since I've played with this but I'll dig-up my notes and put something together for you on the rest of the rs232 mod...

-Surgeon-


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by ellisr63 » Fri Jan 27, 2006 9:02 am

Hi Surgeon,
It sounds like chances are all of the units are going to require a 777es chip (mine that is...as I purchased mine in 04..that would be my luck) . when the chip is replaced and the rs232 part built....will the 777es have full functionality or will it require your modded firmware? Also has anyone tried this on a cx995?
tia,
Ron

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by Surgeon » Fri Jan 27, 2006 10:36 am

Ron,

Check the build date on the back of your units. Early '04 units should have a flashable chip. Later builds, esp Nov '04 onwards, will probably require a chip replacement in order to be able to flash-reprogram them. Being able to flash the chip with CX-777ES firmware was what got me into developing my add-in rs232 mod in the first place.

After reprogramming a CX-985V unit with the CX-777ES's firmware, the unit will still report that it is a 985 (with additional 777-only setup menu features). That's because the firmware reads a model designation resistor that is factory set to the 985 position. To avoid having to change the resistor to the 777 position, a small 'patch' can be applied to the firmware which forces it to ignore the model resistor and into a full 777 state.
 
Even without the firmware 'patch' the unit will communicate and work just fine at this point via rs232 commands... with one exception... Unless it is in full 777 mode (either via a firmware 'patch' or actual resistor change) the rs232's direct-disc-play command won't function. All other commands work perfectly: on/off/play/stop/next-disc/previous-disc etc...

That's about all I can remember off hand without checking some of my notes... If you can get your units upgraded to the 777's firmware, I'll be happy to provide you with the rs232 mod info (which is basically a MAX3232 chip).

-Surgeon-


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by jehill » Fri Jan 27, 2006 11:50 am

Thanks for your input, Surgeon!
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