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  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Mon Dec 10, 2018 5:25 pm   Subject: M1 requires trouble shooting
Do ALL connections to the KLM 1261 board with orher M1 circuits need to be complete before testing voltages at those points?

Or... can the tests values remain true with only the power being suppli ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Mon Dec 10, 2018 8:31 am   Subject: M1 requires trouble shooting
Checked the AD board 1261.
All capacitors and resistors are good.
Voltage values are good.

Distortion still present.

Could there be an issue on the power supply board still. Capacitor was rep ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Tue Nov 20, 2018 8:38 am   Subject: M1 requires trouble shooting
Many distortion problems are caused in the DAC circuit, which is sensitive to voltage. The KLM-1261 board has a power supply area (at lower left on the schematic) where the +/- 12v from the kLM-1269 i ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sat Nov 17, 2018 9:33 pm   Subject: M1 requires trouble shooting
Acetone or lacwuer thinner on electronic components seems harsh.
Would one use hair dryet for heat
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sat Nov 17, 2018 5:17 pm   Subject: M1 requires trouble shooting
"glue around the caps usually isn't a problem if it isn't touching other component leads. Make sure the +5v and +/- 12v are correct and stable. Try breathing on the area with the glue (to provide ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sat Nov 17, 2018 4:00 am   Subject: M1 requires trouble shooting
Many distortion problems are caused in the DAC circuit, which is sensitive to voltage. The KLM-1261 board has a power supply area (at lower left on the schematic) where the +/- 12v from the kLM-1269 i ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Fri Nov 16, 2018 5:20 pm   Subject: M1 requires trouble shooting
After connection was fed proper + _ 12v from psu on board 1269... sound was heard. The sound is more distortion and less buzz, heard on all outputs. With headphone jack connected only, still distorti ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Fri Nov 16, 2018 5:51 am   Subject: Sound is back on M1 - slight buzz heard

Is the "stain" actually yellow/brown glue? If so, that material can deteriorate and absorb moisture from the air, becoming conductive. Depending on what component leads it's touching, it c ...
  Topic: KROME 88 weighted key bed issue
yoshi88

Replies: 0
Views: 203

PostForum: Korg Krome   Posted: Tue Nov 13, 2018 12:06 am   Subject: KROME 88 weighted key bed issue
I've played the KROME 88.
I love the KROME software / firmware...
... but DISLIKE the krome 88 note key bed!

I would prefer the RH3 key bed instead to be standard in this unit!
I wish they were ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sun Nov 11, 2018 6:52 pm   Subject: M1 requires trouble shooting
[quote="voip"]Is there any audio on outputs 3 and 4?[/quote route signal to

Re routed signal to 3 and 4?

Presently NO headphone jack sound
Presently NO Audio on 1 & 2 ( default s ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Thu Nov 08, 2018 2:15 am   Subject: M1 requires trouble shooting
I have made the assumption that the Volume control is functional.

But what if it isn't?

How can I test this?

The Slide VR is located on M1 board 1262.
The part is a 10KBx2 ( RS 30112AC ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Thu Nov 08, 2018 2:14 am   Subject: M1 requires trouble shooting
I have made the assumption that the Volume control is functional.

But what if it isn't?

How can I test this?

The Slide VR is located on M1 board 1262.
The part is a 10KBx2 ( RS 30112AC ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sun Nov 04, 2018 8:37 pm   Subject: M1 requires trouble shooting
What are the standard voltages and their locations?
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sun Nov 04, 2018 12:15 am   Subject: M1 requires trouble shooting
Korg M1

Cleaned the Cr2032 contacts. inserted battery again = 3.3V
Error Message : Low battery remains.

Factory reset 3 times : Low battery remains
No Sound!

Loaded M1Preload Successfu ...
  Topic: M1 requires trouble shooting
yoshi88

Replies: 25
Views: 1086

PostForum: Korg Synths (General)   Posted: Sat Nov 03, 2018 3:52 am   Subject: M1 requires trouble shooting
Just got this M1.

Problem:

No screen illumination... that was later solved after seeing the main board did not receive its 5.5V from the 4 pin connector.

Rebooted.... screen now works ...
 
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