Korg Forums

M1 banks, including the factory preload:
http://www.korgforums.com/support/m1.htm

Hi, Where can I download the factory soundbank ?

A 1N4148 appears to be a good substitute for the 1SS84. Differences in the specs should not matter in the M1 application.

Make sure that you remove any of the yellow glue on the board. It absorbs m ...

Yes, the Syntaur image shows wiring connected for US operation (117V tap). Yellow is indeed common, although it doesn't directly go to the transformer winding - it connects to an internal thermal fuse ...

As far as I know...

The power transformer primary winding has taps for 100/117/220/230/240 volts. The AC common connection is at one end, with the taps following. For US operation the hot lead shou ...

Unwanted phasing can be caused by the existence of a MIDI feedback loop. The repeated MIDI data retriggers the sound, but with a slight delay.

If you're running MIDI software, I suggest temporarily ...

You might consider downloading MIDI-OX (http://www.midiox.com/). It should run fine on Win 10 or 11 when properly installed.

See https://www.sweetwater.com/sweetcare/articles/how-do-i-send-and-rece ...

Turn off "Track Protect" per track or changes won't be stored to the sequencer memory.

For the "FD" model, save sequences to a floppy disk before turning off power.

Download ...

Korg Forums download page for the M1 series...
http://www.korgforums.com/support/m1.htm
...where you'll find many banks including the factory preload.

I've tried self checks before and they didn't work because it isn't booting up, and these combinations don't give any response either.
As I mentioned, I thought that might be the case.

I don't ...

Have you tried self-checks? The following includes two test modes that aren't documented in the service manual...

Korg T-Series Self-Check Modes
------------------------------
Display OS ROM vers ...

You mean to remove the rom chips and then put them back in?
Yes, although you might be able to only partially unseat the chips and then push them back in place. Such contact wiping can help if there' ...

OK - based on what you determined, it appears that the problem is not related to a reset issue.

If you are located in an area where the humidity is high, especially in a coastal region with "s ...

I verified and indeed pin 10 of IC45 which is also going into the mpu is 5 volts and the psu is working fine.

Good. The following will verify that the reset line can also be pulled low by IC45 pin ...

Thanks for the corrected information. While it's possible the M51951B (IC46) has failed, I wouldn't jump to that conclusion based on what you've determined so far.

Just to make sure you have a prop ...

Some observations of your diagnosis...

1) There is no negative 5 volt power supply in the T-series models. Both pin 1 and pin 2 of the 7-pin power connectors (at the supply board and the KLM-1370 m ...