TX7 RAM problems from botched expansion..

[Synthetech]

I picked this unit up with someone's idea of a memory expansion hacked into it.










I powered it on, loaded some patches and only Pg's 1 & 15 would make any sound. 15 the only one that sounded almost as it should, 1, not so much..
The Pg 15 patch would not edit from MONO to POLY and stay that way when I changed pg's. I also noticed that pitch bend did not work right.. it would jump up a few tones, or down.. just one leap in pitch without the smooth transition you'd expect.

The expansion attempt was obviously terrible. He cut a couple traces. One for the pin 18 data paths that linked RAMs 3 and 4 (see repair pics, top side of PCB) and what looks like a link for part of the RESET circuit to RAM 3's pin 18 (bottom of board with blue jumper wire), which also seems to branch over to RAM 1 & 2 from there..
The solder balls for joints look like his iron was a cheap cold RadioShack special.
HE EVEN USED THE IRON TO MAKE A HOLE IN THE CASE to put the rotary memory selector switch in! Grr...


I figured it was best to try and restore the original paths and completely remove the abortion of a RAM expansion.
I checked all continuity, the paths are all linked again as they should be.
I even fixed their crappy Battery + connection. Underneath a lead for the holder did not align with the PCB hole.. so it was not soldered in!










I got it back together, loaded up a set of pg's and found I could only hear the ODD numbered pg's. All the even pg's were dead.
All Pg's 1-32 had a name to display, just no sound.
I still have problems with MONO/POLY being remembered. I can change it, but it will not stay when I change to another pg.
The pitch bend wont work right. It still wants to just jump up or down a full step.


I think RAM 3 may be shot. I think part of the EVEN pg's are on it, including the memory for FUNCTION settings (MONO/POLY, Pitch Bend, etc).

I can hook this up to an Editor and make it sing quite nicely. It sounds fantastic! But only half the pg's, no pitch bend, always wants to play Mono when pg's change.. she's being a tease and I need to narrow it down before I start snipping out and replacing a RAM chip.

Here's a pic of the service manual re: memory allocation





Here is a link to pdf Service Manual

http://elektrotanya.com/yamaha_tx-7.pdf/download.html
(click "Get Manual" under the pic of the manual.. it makes you wait a moment before the link shows.)



Seems my problems fall right in with RAM 3, according to the addresses. I think the butchering fried part of RAM 3.. or entirely.
I cannot figure out what RAM 4 is used for.. doesnt seem to say in the SM.


Here's a memory dump of the unit.
I'd attach a text file, but seems I cant do that here..


F0 43 00 09 20 00 25 13 11 37 4D 33 00 00 0A 20 00 04 59 04 52 10 00 4B 2A 0F 37 63 3D 00 00 0A 00 00 04 00 08 5A 00 00 32 21 17 37 63 63 00 00 00 00 00 04 42 0C 63 01 00 63 11 0A 37 63 63 00 00 26 62 62 06 50 10 50 04 00 2C 22 15 37 63 55 00 00 00 00 00 04 70 08 5D 00 00 29 07 12 37 63 5F 00 00 00 00 00 00 71 0C 63 01 01 63 62 63 63 37 35 32 32 03 02 23 1E 00 00 20 18 53 43 41 54 20 4F 4C 4B 4D 4F 5A 23 14 36 63 50 00 00 00 00 00 00 3A 08 47 02 2B 5A 23 14 36 63 50 00 00 00 00 00 00 3A 00 61 02 2B 5A 49 00 36 63 50 00 00 00 00 00 00 3A 00 3A 1E 00 5A 1E 00 36 63 50 00 00 00 00 00 00 3A 08 61 00 5B 5A 1D 00 36 63 56 00 00 00 00 00 00 3A 00 46 00 5A 5A 23 00 36 63 50 39 00 00 00 00 00 3A 04 63 00 5B 5E 43 5F 3C 32 32 32 32 04 06 32 00 49 60 36 15 53 48 49 4D 4D 45 52 20 20 20 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 04 32 63 63 63 32 63 63 63 00 00 00 00 00 70 00 63 02 00 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 51 04 00 63 63 63 32 63 63 63 00 00 00 00 00 00 00 63 02 00 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 02 00 63 63 63 32 63 63 63 00 00 00 00 00 38 00 63 02 00 63 63 63 63 32 32 32 32 04 00 19 23 0F 63 30 0C 53 4C 58 20 20 20 20 20 20 31 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 04 32 63 63 63 32 63 63 63 00 00 00 00 00 70 03 63 02 00 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 51 04 00 63 63 63 32 63 63 63 00 00 00 00 00 00 03 63 02 00 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 02 00 63 63 63 32 63 63 63 00 00 00 00 00 38 03 63 02 00 63 63 63 63 32 32 32 32 04 00 19 00 0A 63 31 0C 53 4C 58 20 20 20 20 20 20 32 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 0C 00 07 63 63 32 01 63 63 00 00 00 00 00 70 00 63 06 00 0A 63 1E 32 01 63 32 00 00 00 00 00 38 00 63 08 00 14 63 63 32 01 63 63 00 00 00 00 00 00 00 63 02 32 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 02 00 63 63 63 32 63 63 63 00 00 00 00 00 38 00 63 02 00 63 63 63 63 32 32 32 32 15 00 19 23 0F 63 30 0C 53 4C 58 20 20 20 20 20 20 33 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 0C 00 08 63 63 32 01 63 63 00 00 00 00 00 70 00 63 06 00 0C 63 1E 32 01 63 32 00 00 00 00 00 38 00 63 08 00 63 63 63 32 63 63 63 00 00 00 00 00 00 00 50 04 32 14 63 1E 32 01 63 32 00 00 00 00 00 38 00 63 02 32 63 63 63 32 63 63 63 00 00 00 00 00 38 00 63 04 00 63 63 63 63 32 32 32 32 14 00 1E 23 0F 63 30 0C 53 4C 58 20 20 20 20 20 20 34 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 0C 00 07 63 63 32 01 63 63 00 00 00 00 00 70 00 63 06 00 0A 63 1E 32 01 63 32 00 00 00 00 00 38 00 63 08 00 14 63 63 32 01 63 63 00 00 00 00 00 00 00 63 02 32 63 63 1E 32 63 63 32 00 00 00 00 00 38 00 50 0A 00 63 63 63 32 63 63 63 00 00 00 00 00 38 00 63 02 00 63 63 63 63 32 32 32 32 15 00 19 23 0F 63 30 0C 53 4C 58 20 20 20 20 20 20 35 17 4C 0A 20 63 5C 00 00 00 00 00 00 58 00 43 1A 00 2E 49 0A 1C 63 5C 00 00 00 00 00 00 08 00 49 08 00 31 4A 0A 20 62 62 62 00 29 00 00 02 58 00 4A 08 00 23 0F 0A 18 63 5C 5C 00 38 00 00 03 40 00 63 01 15 1E 14 19 12 63 5E 55 00 44 00 63 02 28 00 4E 08 00 1A 19 00 14 63 5C 00 00 27 63 00 0F 10 00 62 01 16 63 21 62 63 33 25 32 0E 0F 07 21 27 23 00 16 30 53 50 20 50
49 54 43 48 20 20 24 19 31 1F 63 29 00 00 00 00 00 00 38 08 3E 20 4B 25 16 16 32 63 16 0F 00 00 00 00 00 68 0C 63 0A 00 48 24 16 2C 63 2B 25 00 00 00 00 00 58 01 2C 38 00 4B 10 21 29 63 2C 00 00 00 00 05 00 30 00 4B 08 00 1E 18 16 1B 63 37 00 00 00 00 00 00 58 00 3C 24 00 37 12 16 23 63 51 2B 00 00 00 00 00 00 00 63 02 00 63 63 63 63 32 32 32 32 11 0C 27 00 06 26 19 0C 53 50 41 43 2E 41 43 43 2E 20 45 36 63 23 63 00 63 00 27 1E 00 00 39 04 2E 08 4F 63 00 00 24 63 40 00 00 34 00 00 00 39 04 53 00 00 63 2A 07 28 62 63 63 63 27 00 00 0C 39 04 63 01 0B 63 25 11 2C 63 5F 20 00 24 00 00 03 3A 0C 63 02 00 18 28 00 20 63 00 00 00 29 00 00 00 3A 00 57 08 00 5A 3E 1C 3A 63 5F 20 00 24 00 0E 02 3A 00 5F 04 00 5E 43 5F 3C 32 32 32 32 09 08 23 00 00 00 00 0C 53 50 41 43 45 20 32 30 30 31 45 36 63 23 63 00 63 00 27 1E 00 00 38 04 2E 08 4F 63 00 00 24 63 40 00 00 34 00 00 00 39 04 53 00 00 63 2A 07 28 62 63 63 63 27 00 00 0C 38 04 63 01 0B 63 25 11 2C 63 5F 20 00 24 00 00 03 3F 0C 63 02 00 18 28 00 20 63 00 00 00 29 00 00 00 3F 00 57 08 00 5A 3E 1C 3A 63 5F 20 00 24 00 0E 02 3B 00 5F 04 00 63 63 55 3C 63 06 32 63 03 08 59 32 26 63 7A 30 53 50 41 43 45 20 53 4C 49 44 2F 63 1C 13 62 62 5B 62 27 32 32 06 3C 08 52 36 00 34 24 29 27 63 62 3C 00 27 00 00 0B 40 00 62 02 00 2F 24 29 47 63 62 62 00 27 00 00 0F 38 08 63 02 00 51 4D 54 41 63 62 62 00 27 00 00 0F 28 00 63 02 00 3E 33 1D 47 52 5F 60 00 1B 00 07 07 70 08 56 00 00 4A 4C 63 32 63 59 60 00 27 00 0E 0F 70 1C 62 00 00 63 63 1E 63 34 47 00 51 0D 0F 17 00 0A 00 31 0C 53 50 41 43 45 20 54 41 4C 4B 5A 23 14 36 63 50 7F 00 7F 00 00 00 3A 08 47 10 32 5A 23 14 36 63 50 00 00 00 00 00 00 3A 00 61 00 32 5A 49 00 36 63 50 00 00 00 00 00 00 3A 00 3A 1E 00 5A 1E 00 36 63 50 00 00 00 00 00 00 3A 08 61 00 5B 5A 63 50 36 63 56 63 00 00 00 00 00 3A 00 63 13 63 5A 55 28 36 63 3B 1B 00 00 00 00 00 39 04 4F 01 14 63 10 22 47 00 17 63 00 04 06 40 00 63 60 78 0C 53 50 41 43 45 2E 4F 46 46 2E 63 00 00 18 63 63 63 00 27 0C 0C 0C 38 10 63 12 0A 37 00 00 1C 63 5F 63 00 27 0C 0C 0C 38 0C 63 04 00 3F 00 00 1D 60 5B 63 00 27 00 00 0C 38 14 5C 02 00 63 00 00 0D 63 63 63 00 27 00 00 0C 38 08 5C 03 38 63 00 00 1D 35 5F 00 00 27 00 00 0C 38 00 63 02 00 23 00 00 20 63 5E 37 00 27 00 00 0C 38 00 52 3E 00 63 62 4B 3C 32 3D 32 2F 11 07 00 00 06 00 06 00 53 50 41 43 45 4E 4F 49 53 33 63 00 00 2C 63 63 63 00 27 0C 0C 0C 38 10 63 12 0A 37 00 00 29 63 5F 63 00 27 0C 0C 0C 38 0C 63 04 00 3F 00 00 1D 60 5B 63 00 27 00 00 0C 38 14 5C 02 00 63 00 00 0D 63 63 63 00 27 00 00 0C 38 08 5C 03 38 63 00 00 63 35 5F 00 00 27 00 00 0C 38 00 50 02 00 23 00 00 37 63 5E 37 00 27 00 00 0C 38 00 52 3E 00 63 62 4B 3C 32 3D 32 2F 0B 05 00 00 06 00 06 00 53 50 41 43 45 4E 4F 49 53 45 3C 0F 0F 46 63 5A 50 00 00 00 00 00 3A 08 50 02 01 44 14 14 46 63 5A 50 00 00 00 00 00 52 08 63 02 00 44 14 14 46 63 5A 50 00 00 00 00 00 3A 00 61 02 00 44 14 14 4F 63 5A 50 00 00 00 00 00 3A 04 63 00 00 0D 14 14 22 63 5A 50 00 00 00 00 00 3A 04 63 00 00 23 14 14 1A 63 5A 63 00 00 00 00 00 3A 00 53 02 00 5E 43 5F 3C 32 32 32 32 11 0F 3C 45 00 00 3B 18 57 41 53 50
20 53 54 49 4E 47 52 2E 22 63 63 5F 00 00 00 00 00 00 58 03 58 0E 00 52 2E 22 63 63 5F 00 00 00 00 00 00 00 03 55 08 00 52 1A 63 63 63 5F 00 00 00 00 00 00 70 03 63 02 00 40 52 3E 63 63 63 63 00 27 1B 00 03 28 03 4F 0E 00 4C 1E 11 63 63 60 5A 00 00 00 00 00 38 03 56 0A 00 52 1A 63 63 63 5F 00 00 00 00 00 00 38 03 63 02 00 63 63 63 63 32 32 32 32 02 07 33 00 00 63 33 18 53 61 77 44 6F 77 6E 20 7D 31 07 40 2D 63 2D 63 00 00 00 00 00 00 38 00 63 00 00 0A 40 31 63 2E 63 00 00 00 00 00 00 38 00 63 04 00 0D 40 31 63 2E 63 00 00 00 00 00 00 38 00 63 00 00 0F 40 31 63 2C 63 00 00 00 00 00 00 38 00 63 04 00 19 40 31 63 32 63 00 00 00 00 00 00 38 00 63 00 00 46 28 31 63 63 5C 00 00 00 00 00 00 38 00 63 02 00 63 63 63 63 32 32 32 32 1F 0F 23 00 00 00 31 18 53 61 79 20 41 67 61 69 6E 2E 2C 09 28 22 63 5F 5F 00 00 00 00 00 4A 00 40 0A 00 2C 09 28 22 63 5F 5F 00 00 00 00 00 3A 00 43 02 00 2C 09 28 22 63 5F 5F 00 00 00 00 00 2A 00 4B 02 00 58 25 3C 20 63 5E 5E 00 36 00 00 00 71 00 63 00 00 2C 09 28 22 63 5F 5F 00 00 00 00 00 02 00 51 02 00 58 25 3C 20 63 5E 5E 00 36 00 00 00 01 00 63 00 00 5E 43 5F 3C 32 32 32 32 01 0F 20 21 22 00 18 18 53 6D 6F 6F 74 68 53 71 72 31 39 09 28 22 63 5F 5F 00 00 00 00 00 4A 18 40 0C 00 32 09 28 22 63 5F 5F 00 00 00 00 00 3A 10 43 04 00 2E 09 28 22 63 5F 5F 00 00 00 00 00 2A 04 4B 02 00 58 25 3C 41 63 5E 5E 00 36 00 00 00 71 00 63 00 00 2F 09 28 22 63 5F 5F 00 00 00 00 00 02 14 51 02 00 47 25 3C 46 63 5E 5E 00 36 00 00 00 01 00 63 00 00 5E 43 5F 3C 32 32 32 32 01 0F 20 21 22 00 18 18 53 6D 6F 6F 74 68 53 71 72 33 4E 31 25 00 63 60 4B 00 37 00 1B 00 71 01 2B 04 00 24 1E 2A 3C 63 5A 00 00 33 00 00 00 11 00 55 02 00 3E 23 2D 00 63 60 4F 00 30 00 1E 00 19 00 44 04 00 24 1E 2A 3C 63 5A 00 00 33 00 00 00 61 14 55 02 01 39 2A 23 49 63 60 5B 00 22 00 22 00 69 00 48 02 00 24 1E 2A 3C 63 5A 00 00 33 00 00 00 09 10 55 02 00 39 53 11 54 28 3C 00 32 05 03 1C 30 00 63 28 18 53 6D 75 74 68 46 61 6C 6C 31 15 3C 2E 27 63 4F 00 00 2F 00 2E 00 78 00 63 02 00 0E 3C 2E 27 63 4F 00 00 2F 00 2E 00 50 00 53 00 00 01 3C 2E 27 63 4F 00 00 2F 00 2E 00 48 00 40 04 00 00 3C 2E 27 63 4F 00 00 2F 00 2E 00 30 00 2E 08 00 09 3C 2E 27 63 4F 00 00 2F 00 2E 00 08 00 4F 05 07 15 3C 2E 27 63 4F 00 00 2F 00 2E 00 38 00 63 02 00 63 63 63 63 32 32 32 32 0F 0F 23 00 00 00 01 0C 53 70 69 20 45 66 78 20 20 31 0A 32 1F 22 63 5A 00 00 3A 00 01 00 68 00 59 1E 00 0E 28 1E 14 63 5B 00 00 34 0B 00 03 58 00 53 06 00 15 3E 52 1E 63 5E 00 00 3C 00 00 00 60 00 63 02 00 0A 32 1F 22 63 5A 00 00 3A 00 01 00 28 00 4D 12 01 0E 28 1E 14 63 5B 00 00 34 0B 00 03 18 00 52 02 00 15 3E 52 1E 63 5E 00 00 3C 00 00 00 10 00 63 00 00 5E 43 5F 3C 32 32 32 32 0A 0F 22 21 00 00 19 18 53 70 69 20 45 66 78 20 20 32 55 44 17 3D 63 4F 00 00 26 00 00 00 71 0C 52 12 00 59 32 17 3D 63 58 00 00 26 00 07 00 59 0C 3E 08 00 55 23 0A 3D 63 5D 00 00 26 00 00 00 43 0C 5A 00 00 58 23 15 3D 63 5C 00 00 27 00 00 00 3B 00 63 02 00 2F 3E 2C 35 63 5E 5D 00 2E 17 00 00 73 07 63 00 00 42 18 18 34 63 5D 00 00 2D 00 00 00 0B 00 63 00 00 62 62 62 62 32 32 32 32 16 0D 17 00 0A 00 18 18 53 71 72 54
68 61 6E 67 31 61 55 44 29 3D 63 4F 00 00 26 00 00 00 71 0C 5C 12 00 59 32 2C 3D 63 58 00 00 26 00 07 00 59 0C 4E 0A 00 55 23 0C 3D 63 5D 00 00 26 00 00 00 6B 0C 5A 00 00 58 23 15 3D 63 5C 00 00 27 00 00 00 3B 00 63 02 00 2F 3E 0E 35 63 5E 00 00 2E 63 00 00 73 07 63 00 00 42 18 17 34 63 5D 00 00 2D 00 00 00 5B 00 63 00 00 62 62 62 62 32 32 32 32 1A 0D 17 00 0A 00 18 18 53 71 72 54 68 61 6E 67 32 61 1B 24 23 2D 63 54 00 00 26 00 00 00 71 0C 47 0C 00 20 22 1C 2C 63 58 00 00 26 00 07 00 59 0C 5F 02 00 4D 1B 16 26 63 5D 00 00 26 00 00 00 43 0C 63 00 01 19 1A 0F 25 63 5C 00 00 27 00 00 00 33 00 43 04 00 23 16 15 26 63 5E 00 00 2E 00 00 00 5B 07 5C 02 00 3B 13 17 2C 63 5D 00 00 2D 00 00 00 33 00 63 00 00 62 62 62 62 32 32 32 32 0A 0D 17 00 0E 00 18 18 53 71 75 72 53 77 65 70 31 61 1B 24 0A 2D 63 54 00 00 26 00 00 00 71 0C 47 0C 00 20 22 1C 2C 63 58 00 00 26 00 07 00 59 0C 57 08 00 4D 1B 16 26 63 5D 00 00 26 00 00 00 43 0C 63 00 01 19 1A 0F 25 63 5C 00 00 27 00 00 00 3B 00 4B 02 00 23 16 15 26 63 5E 00 00 2E 00 00 00 73 07 63 00 00 3B 13 17 2C 63 5D 00 00 2D 00 00 00 0B 00 63 00 00 62 62 62 62 32 32 32 32 0A 0D 17 00 0E 00 18 18 53 71 75 72 53 77 65 70 32 61 63 38 0A 2C 5D 1C 00 00 00 00 00 00 39 1C 32 12 00 63 00 00 00 63 00 00 00 34 4B 00 00 3F 10 4B 02 00 63 24 06 37 5A 1E 00 00 27 50 00 0C 3D 1C 32 28 00 63 14 0A 2C 63 5F 20 00 24 39 00 03 3F 10 4B 02 00 63 12 00 00 63 00 00 00 29 00 00 00 3F 00 42 00 00 63 35 0B 2C 63 5F 20 00 24 39 00 02 3F 00 63 00 00 5E 43 5F 3C 32 32 32 32 10 0C 23 00 00 00 30 18 54 41 4B 45 20 4D 45 20 20 20 59 16 14 29 63 5C 00 00 00 00 00 00 38 00 63 00 00 58 18 17 25 63 5A 00 00 00 00 00 00 38 00 60 04 01 0D 0E 14 1E 63 5F 63 00 00 00 00 00 38 00 63 00 00 4C 23 63 0B 43 26 49 00 00 00 00 00 38 00 63 0C 01 52 50 13 0E 50 5F 00 00 00 00 00 00 38 00 60 02 00 09 0E 11 22 3D 60 00 00 00 00 00 00 38 00 63 08 01 20 1E 5E 10 32 07 51 63 09 08 41 00 00 00 55 00 54 41 4B 45 20 4F 46 46 20 20 55 22 1F 32 63 33 00 00 27 0C 0C 0C 3C 04 55 02 00 5F 39 63 32 63 20 31 00 27 0C 0C 0C 3A 08 55 04 00 30 55 18 2A 60 5A 31 00 27 00 00 0C 3C 08 5C 02 00 50 55 18 2A 63 5A 2D 00 27 00 00 0C 39 08 5E 02 00 31 55 18 2A 63 5A 00 00 27 00 00 0C 39 00 59 02 00 50 55 18 2A 63 5A 00 00 27 00 00 0C 3C 00 5E 02 00 63 62 4B 3C 32 32 32 32 11 05 00 00 00 00 0A 0C 55 4E 44 52 57 54 52 42 52 53 5E 38 18 37 5D 1C 00 00 00 00 00 00 39 00 18 12 00 63 00 00 00 63 00 00 00 34 4B 00 00 3F 00 3E 00 00 5A 2A 07 37 5A 1E 00 00 00 00 00 00 3D 00 5D 0A 00 58 60 20 1E 4F 41 00 00 00 00 00 00 3E 00 63 00 00 63 14 00 00 63 00 00 00 29 00 00 00 3F 00 50 00 00 1B 3E 11 3A 63 5F 20 00 24 39 0E 03 3F 00 63 00 00 63 63 63 4A 63 63 00 32 0F 0F 23 00 00 00 30 18 55 50 53 45 45 45 45 45 45 45 5E 38 18 37 5D 1C 00 00 00 00 00 00 39 00 18 12 00 63 00 00 00 63 00 00 00 34 4B 00 00 3F 00 3E 00 00 5A 2A 07 37 5A 1E 00 00 00 00 00 00 3D 00 5D 0A 00 58 60 20 1E 4F 41 00 00 00 00 00 00 3E 00 63 00 00 63 14 00 00 63 00 00 00 29 00 00 00 3F 00 50 00 00 5F 3E 11 3A 63 5F 20 00 24 39 0E 03 3F 00 63 00 00 63 63 63 63 63 63 00 32 0F 0F 23 00 00 00 30 18 55 50 53 57
45 45 45 45 45 50 52 F7





F0 43 00 02 20 00 40 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 40 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 41 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 41 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 42 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 42 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 43 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 43 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 44 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 44 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 45 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 45 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 46 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 46 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 47 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 47 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 48 40 00 09 0F 0F 7F 0F 00 00 00 00 63 63 17 18 48 40 00 09 0F 0F 7F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 49 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 49 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4A 41 00 0B 0F 0F 0F 7F 00 00 00 00 63 63 17 18 4A 41 00 0B 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4B 40 00 09 7F 0F 0F 0F 00 00 00 00 63 63 10 18 4B 40 00 09 7F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4C 40 00 0B 0F 0F 7F 0F 00 00 00 00 63 63 17 18 4C 40 00 0B 0F 0F 7F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 4D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4E 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 17 18 4E 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 4F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20
44 41 54 41 20 20 50 40 01 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 50 40 01 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 51 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 10 18 51 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 52 40 04 09 0F 0F 0F 4F 00 00 00 00 63 63 17 18 52 40 04 09 0F 0F 0F 4F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 53 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 53 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 54 4C 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 54 4C 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 55 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 55 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 56 4C 00 09 0F 0F 1F 0F 00 00 00 00 63 63 17 18 56 4C 00 09 0F 0F 1F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 57 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 57 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 58 4C 00 0B 0F 7F 0F 0F 00 00 00 00 63 63 17 18 58 4C 00 0B 0F 7F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 59 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 59 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5A 40 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 5A 40 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5B 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5B 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5C 40 00 09 2F 0F 0F 0F 00 00 00 00 63 63 17 18 5C 40 00 09 2F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5E 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 5E 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20
44 41 54 41 20 20 40 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 40 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 41 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 41 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 42 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 42 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 43 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 43 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 44 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 44 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 45 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 45 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 46 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 46 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 47 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 47 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 48 40 00 09 0F 0F 7F 0F 00 00 00 00 63 63 17 18 48 40 00 09 0F 0F 7F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 49 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 49 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4A 41 00 0B 0F 0F 0F 7F 00 00 00 00 63 63 17 18 4A 41 00 0B 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4B 40 00 09 7F 0F 0F 0F 00 00 00 00 63 63 10 18 4B 40 00 09 7F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4C 40 00 0B 0F 0F 7F 0F 00 00 00 00 63 63 17 18 4C 40 00 0B 0F 0F 7F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 4D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4E 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 17 18 4E 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 4F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 4F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20
44 41 54 41 20 20 50 40 01 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 50 40 01 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 51 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 10 18 51 40 00 0B 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 52 40 04 09 0F 0F 0F 4F 00 00 00 00 63 63 17 18 52 40 04 09 0F 0F 0F 4F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 53 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 53 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 54 4C 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 54 4C 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 55 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 55 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 56 4C 00 09 0F 0F 1F 0F 00 00 00 00 63 63 17 18 56 4C 00 09 0F 0F 1F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 57 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 57 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 58 4C 00 0B 0F 7F 0F 0F 00 00 00 00 63 63 17 18 58 4C 00 0B 0F 7F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 59 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 59 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5A 40 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 5A 40 00 09 0F 0F 0F 7F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5B 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5B 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5C 40 00 09 2F 0F 0F 0F 00 00 00 00 63 63 17 18 5C 40 00 09 2F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5D 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5E 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 5E 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 17 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20 44 41 54 41 20 20 5F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 5F 40 00 09 0F 0F 0F 0F 00 00 00 00 63 63 10 18 00 27 20 59 41 4D 41 48 41 20 20 54 58 37 20 20 46 55 4E 43 54 49 4F 4E 20 20
44 41 54 41 20 20 30 F7



Looks like there's a lot of holes (0's) in the first half of the dump. The 2nd half has even more 0's all over it.


I did the self tests. It did not indicate any problems with RAM/ROM, Midi or anything else.
The SM says the RAM test is not 100% accurate.. great! I think it says it wont test the areas I have issues with.


If anyone else can offer their thoughts, I'd love to hear them.
I need to find a source for the RAM. Guess I'll buy a couple of them.. seems cutting the legs, then desolder each cut leglet out is the best way to remove RAM 3. Maybe I should socket it while in there..

[commodorejohn]

Is this that one that was on eBay a couple weeks ago? Really glad I didn't hold out for that, now.

[Synthetech]

Is this that one that was on eBay a couple weeks ago? Really glad I didn't hold out for that, now.

Yes.

It's not all that bad.. just needs a bit more TLC.

Once I fix the RAM issue, it should make for a nice FM 6op synth.




Did a mod move my thread? I coulda swore I posted this in the gear repair section...

[Synthetech]

Been learning some more about this beast as I twiddle with it more.

1st of all, I've had quite a blast tweaking out some voices and it sounds just as a DX7 should. Just a bit of clipping at high volumes.. lowering the volume down a couple notches fixes that problem.
The highs are angelic, the lows are monsterous.

Using the Ctrlr TX7 Editor, I can get pitch bend to work and activate poly mode.
I can do a Voice Edit Buffer dump and save an edited program as a text/sys file, then send it back to the TX7 and have it restore the voice back to the edit Buffer.
I found out soon that I could not simply just save the edited voice over an existing voice in TX7's RAM using the TX7's control panel.. there must be a librarian app that will do it for me that I have not tried out yet.. been having too much fun playing with it to bother searching for it yet.



Anyway, so it seems maybe it is actually the 2nd RAM chip that is bad.
It's got to be one of the first two that is acting up since I found that the edit buffer on chip3 is fine. Seems the TX loads program data from one of the first two chips depending on the program #, INTO the 3rd RAM chip and THEN the TX's FM and EG chips read data from the 3rd chip.
I could be wrong... but even the data lines seem to flow directly from 3rd chip to a connector that ribbons data lines to the FM/EG pcb.

I don't have any Function Data loaded for each program. Thats why mono/poly mode wont stay changed and pitch bend is wonkey.. the FUNCTION memory is all defaulted.
The SM seems to indicate function and edit buffers are both on chip3 as well as both sets of Function Data memories for TX7 and a DX7.

WTH chip 4 data is, I'm not sure. SM doesn't say. Or I'm interpreting the memory map wrong.


Here's what appears to be compatible SRAM from Mouse.com

http://ca.mouser.com/Search/ProductDeta ... 116LA20TPG

Its a IDT 6116LA. 2kX8bit low power 2K SRAM.
The LA at the end is what indicates it to be used with a 3v backup battery. 2v minimum.


I need to do an order from Mouse for other parts soon.. might as well grab a few of these and some sockets..
Think I'll try to remove the 1st two intact, socket their spots, then install fresh chips in.
If it fixes it, great. If not, I can still try the last two...

[commodorejohn]

DX Manager is a decent librarian you could use - you can get the last pre-demoware version here.

[Synthetech]

DX Manager is a decent librarian you could use - you can get the last pre-demoware version here.

Thanks for the link. Not bad for free.

I tried the v3 demo and it works very nicely.. it has a few more tricks. May be worth the $20 to invest in it.

FM-Alive has just about remedied all the quirks I've been dealing with.
It lets me extract all the presets I could not access via the TX7's panel.
So evidently the patches are loading into RAM. FM-ALIVE can dig the patch out of RAM and place it inside the TX7's edit buffer.. yet the TX7 itself cannot get any even numbered patch from it's own RAM and load it into the edit buffer.. how very odd.

So I'm back to thinking RAM 3 or 4 is bad. Just wish I had some knowledge in how the TX7 memory was handled so I could pin down what the real problem is.