Hi there guys.
I need your help. My monotron delay has stopped working.
The sound wheel is on the max and the sound coming out of the speaker is just almost impossible to hear.
The delay effects seem not be working.
I have obviously tested with off the package new batteries and also with external speakers, whose volume has to be on the max for something to be heard.
What can I do?
Thank you.
Korg monotron delay sound volume very low and delay not work
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- KVRAF
- 16879 posts since 8 Mar, 2005 from Utrecht, Holland
Got warranty? Then bring it back to the dealer you bought it from 
We are the KVR collective. Resistance is futile. You will be assimilated. 
My MusicCalc is served over https!!
My MusicCalc is served over https!!
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- KVRAF
- 7540 posts since 7 Aug, 2003 from San Francisco Bay Area
This isn’t the best forum to ask for hardware synth repair advice. Maybe try Muff Wiggler or Analogue Heaven or SynthDIY or a Facebook group?
Incomplete list of my gear: 1/8" audio input jack.
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thecontrolcentre thecontrolcentre https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=76240 - KVRAF
- 37262 posts since 27 Jul, 2005 from Scottish Borders
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- addled muppet weed
- 111329 posts since 26 Jan, 2003 from through the looking glass
most likely, unless you already have a set up for repairs. a decent soldering iron will cost more.thecontrolcentre wrote:Cheaper to buy another one, rather than paying for repair I would think. Mine was only £20 (secondhand).
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- Beware the Quoth
- 35520 posts since 4 Sep, 2001 from R'lyeh Oceanic Amusement Park and Funfair
Yeah, plus the monotrons are all SMT parts...vurt wrote:most likely, unless you already have a set up for repairs. a decent soldering iron will cost more.thecontrolcentre wrote:Cheaper to buy another one, rather than paying for repair I would think. Mine was only £20 (secondhand).
An idiot on Set Theory:
"In some cases there is an object called red that contains everything that is red. In much the same way a pot is a plate."
"In some cases there is an object called red that contains everything that is red. In much the same way a pot is a plate."
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- addled muppet weed
- 111329 posts since 26 Jan, 2003 from through the looking glass
i had it in my mind that they'd been designed with easy mods available? or did they add patch points? or am i totally imagining this?
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- Beware the Quoth
- 35520 posts since 4 Sep, 2001 from R'lyeh Oceanic Amusement Park and Funfair
yeah, despite being SMT, they put well-spaced (and annotated) 'patch points' onto the board, and provided schematics etc.vurt wrote:i had it in my mind that they'd been designed with easy mods available? or did they add patch points? or am i totally imagining this?
An idiot on Set Theory:
"In some cases there is an object called red that contains everything that is red. In much the same way a pot is a plate."
"In some cases there is an object called red that contains everything that is red. In much the same way a pot is a plate."
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- addled muppet weed
- 111329 posts since 26 Jan, 2003 from through the looking glass
thanks 
least i know im not losing more of my mind
least i know im not losing more of my mind
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- KVRist
- 434 posts since 29 Jun, 2008 from Mid Wales, UK.
It may well be low voltage.
The circuit diagram (schematic) is available online in PDF format.
It has a voltage converter IC1 (TPS61071) to make a 5V supply for the circuits from the batteries. The 5V supply is called VCC on the schematic. You should be able to find 2 test point pads on the pcb. TP7 is power ground and TP9 is VCC. A voltmeter can be used to verify 5v DC between those 2 test points.
The delay is a digital chip and may not work at all below about 4.5V DC, while the rest of circuit being analog might try to make some sound down to 3V or less.
Sometimes battery connector springs get broken solder joints to the pcb or just dirty spings where they contact the battery terminals.
If there is an external power adapter of socket ( I see no mention of one on the schematic), those can fail since they usually have a switch in them to disconnect the battery with a power adapter plugged in.
The circuit diagram (schematic) is available online in PDF format.
It has a voltage converter IC1 (TPS61071) to make a 5V supply for the circuits from the batteries. The 5V supply is called VCC on the schematic. You should be able to find 2 test point pads on the pcb. TP7 is power ground and TP9 is VCC. A voltmeter can be used to verify 5v DC between those 2 test points.
The delay is a digital chip and may not work at all below about 4.5V DC, while the rest of circuit being analog might try to make some sound down to 3V or less.
Sometimes battery connector springs get broken solder joints to the pcb or just dirty spings where they contact the battery terminals.
If there is an external power adapter of socket ( I see no mention of one on the schematic), those can fail since they usually have a switch in them to disconnect the battery with a power adapter plugged in.
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- KVRer
- 1 posts since 29 May, 2023
Hi there, was this issue ever resolved?
I just dug up the duo and the delay and they both have the same issue ut of the blue.
They were left turned ff and without batteries in it.
But now when I turn them on there is hardy any volume, either from the speaker or through the phones output.
I'm not that known with soldering these kind f things so I hope someone found what the issue is and would like to share!
Thanks in advance!
I just dug up the duo and the delay and they both have the same issue ut of the blue.
They were left turned ff and without batteries in it.
But now when I turn them on there is hardy any volume, either from the speaker or through the phones output.
I'm not that known with soldering these kind f things so I hope someone found what the issue is and would like to share!
Thanks in advance!