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Where is the (very quiet) buzzer on MK4?  

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jimwsmith
(@jimwsmith)
Active Member
Where is the (very quiet) buzzer on MK4?

After investigating multiple posts and testing a wide range of M300 commands I have come to the conclusion its a hardware issue why the buzzer is so quiet.
Partly it's so high pitched and only a few frequencies make a slightly loud noise.
Does anyone know where the physical buzzer device is located?  I'm guessing it's just a cheap piezoelectric disc.

Posted : 20/05/2024 8:16 pm
ventrue3000
(@ventrue3000)
Active Member
RE: Where is the (very quiet) buzzer on MK4?

It's the beige rectangle on the back of the LCD board, labelled KMTG1603-1. It's next to the connector.

Posted : 20/05/2024 11:15 pm
Protoncek
(@protoncek-2)
Eminent Member
RE:

Yep, buzzer on MK4 is a biggest shame of Prusa, since it's totally unusable. It's located on the LCD board: a white square thing (marked with red circle on the picture). I removed it and added small amplifier board (from aliexpress) and somewhat bigger speaker. You can find 5V somewhere on that board, too (for powering amplifier)

 

This post was modified 4 weeks ago 5 times by Protoncek
Posted : 21/05/2024 5:37 am
jimwsmith
(@jimwsmith)
Active Member
Topic starter answered:
RE: Where is the (very quiet) buzzer on MK4?

Does anyone have the schematics for the xLCD board?

Posted : 21/05/2024 12:28 pm
jimwsmith
(@jimwsmith)
Active Member
Topic starter answered:
RE: Where is the (very quiet) buzzer on MK4?

Found it in another post (in case anyone else wants it) https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-hardware-firmware-and-software-help/xl-electrical-schematic/#post-708423

KMTG1603-1 25V 5mA - Datasheet link https://www.farnell.com/datasheets/97521.pdf

Posted : 21/05/2024 12:36 pm
jimwsmith
(@jimwsmith)
Active Member
Topic starter answered:
Simple fix to get an audible buzzer

I just soldered a cheap piezo buzzer across the useless Prusa one.  Now I can hear it.
No need for amplifier

Posted : 25/05/2024 9:11 pm
Protoncek
(@protoncek-2)
Eminent Member
RE: Where is the (very quiet) buzzer on MK4?

Yeah, i tried that, too, but it was still to quiet for me. I guess i didn’t have correct buzzer module…

Posted : 26/05/2024 6:57 am
jimwsmith
(@jimwsmith)
Active Member
Topic starter answered:
RE: Where is the (very quiet) buzzer on MK4?

https://www.ebay.co.uk/itm/154997516556?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=n8gr-xkxSFi&sssrc=4429486&ssuid=RP58NcOySWu&var=&widget_ver=artemis&media=COPY

is what I used

Posted : 26/05/2024 12:53 pm
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