K5synth

It might not be the actual cause, but look for cracked solder joints, especially on the power supply PCB, it can cause lots of intermittent problems, power aupply noise and weird voltages all around. Ideally, rework every single solder joint on that PCB. If the backlight is dead, it would be worth disabling the inverter.

Le 2016-07-05 12:10, "Alejandro Caceres accaceres@... [k5synth]" <k5synth@yahoogroups.com> a écrit :

I made it start!!

Something seems broken on the K5m's reset circuit, I lifted IC15 (the reset controller) and now the synth starts one out of three times, so it needs fixing there. Once it starts everything seems to work ok so I'm on the right track.

Thank you very much for all your help.

On 30 June 2016 at 15:48, Alejandro Caceres <accaceres@gmail.com> wrote:

I programmed both EPROMs, and the synth still refuses to start. Also tried removing and replacing the onboard battery to clear all settings, checked the PSU voltages and loose cconnections to no avail. With some help from the schematics and a oscilloscope I traced the problem to the main CPU halting shortly after startup.

I tried operating the synth without the screen to see if the problem comes from the LCD or from somewhere else, but it doesn't seem to respond to any commands I send from the MIDI controller, regardless of the channel or mode I set.

Does anyone know what the "out of the box" MIDI defaults are for the K5m?

On 9 June 2016 at 15:13, Alejandro Caceres <accaceres@...> wrote:

I have just checked IC26 on my K5M, and the code is the same so it should work.

I'll program the EPROM and let you guys know if it works.

Thanks again,

Alejandro

On 8 June 2016 at 22:11, Alejandro Caceres accaceres@... [k5synth] <k5synth@yahoogroups.com> wrote:

Thanks Jeroen!!!!

This will no doubt help fix my K5M. Will check if the EPROM code tomorrow afternoon and will let you know if it's the same on the K5 and K5M.

Thanks again,

Alejandro

On 7 June 2016 at 18:41, Jeroen Oldenhof jeroen@... [k5synth] <k5synth@yahoogroups.com> wrote:

[Attachment(s) from Jeroen Oldenhof included below]

Hi guys,

I just uploaded the file 'KAWAI-K5-IC26-P015-M4DF.bin' in the K5OS1.3 & K5M OS1.2' subfolder of the k5synth files section on yahoo groups.
Not sure if this is the right place, but additional subfolders don't seem really necessary to me..

Just to be sure, it's the dump of this IC:



Hope this is useful!

Best,
- Jeroen

Op 3-6-2016 om 16:35 schreef Jeroen Oldenhof jeroen@... [k5synth]:

I have a K5 and an EEPROM programmer. If this chip is equal to the one in the K5M, I will extract it and dump its contents this weekend.

Best,
- Jeroen

Op 3-6-2016 om 16:33 schreef Daniel Forró danforcz@... [k5synth]:

Try to ask Grant at Music Technologies Group, he has some files for K1m and mentioned 27C256 here:

http://www.musictechnologiesgroup.com/mtg_eproms.htm

Good luck!

Daniel Forro

On Jun 3, 2016, at 11:02 PM, Alejandro Caceres accaceres@gmail.com [k5synth] wrote:

Hi Antoine!

Thanks for the heads-up. I just got a response from the Kawai US tech support line, they provided me with the 64kb K5M v1.2 system ROM, but not with the file for the 32kb 27c256 IC26 EPROM.

If someone else got that file at hand please let me know.

Thanks!

On 30 May 2016 at 18:16, Antoine Deschênes antdes45@... [k5synth] <k5synth@yahoogroups.com> wrote:

Hi,

I could dump from a K5 eventually. My K5 as well as the EEPROM reader are quite far from my new place right now, so I can't do it very soon. I guess if the sticker on the EEPROM matches between the two synths, it should work just as well. You could try getting the ROM file from Kawai US or Kawai UK, they usually give them by email but they don'T have all of them.

Cheers,

Antoine

--

Antoine Deschênes

2016-05-30 17:05 GMT-04:00 Alejandro Caceres accaceres@... [k5synth] <k5synth@yahoogroups.com>:

I am working to fix a K5M modular synth, which for some strange reason had both EPROMs corrupted (IC29 and IC26).

I already made a replacement for IC29: sourced a 27C512 chip and burned it with the K5M v1.2 system software.

However, I cannot find the 32kb file to program the IC26 27C256 chip anywhere.

Does anyone have the file for that chip? Or, maybe someone with a EEPROM reader and a working K5M can make a ROM dump for me?

Thanks in advance!