Ensoniq ESQ1 keyboard controller chip

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Blairio
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Ensoniq ESQ1 keyboard controller chip

Post by Blairio » Thu Sep 19, 2019 9:11 pm

This is a request for help for my pal Bob who recently unearthed his ESQ1 from his basement.

It had been down there for some while so he was unsure of its state of health.

As things turned out all 8 voices are perfect, and all but 8 notes play on the keyboard. These form a contiguous block, and reading various thread on ESQ1 keyboard problems he thinks it may be a dodgy keyboard controller chip.

Unseating and reseating the chip made no difference, and while he finds someone to do the logic checks on the chip he also wants so find out if a replacement one is available, and if so from where, and how much.

Have any ESQ1 users / repairers a suggestion where Bob might get a replacement 65002B (aka R1120-12, U1) keyboard controller chip?

He has done a net search, but the site he found which claimed to have one in stock had a dodgy (i.e. scam) feel to it.

With thanks in advance,

Blair

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acidbob
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Post by acidbob » Fri Sep 20, 2019 2:22 am

https://www.syntaur.com/ ask by mail
or https://synteknik.com/parts/ensoniq-esq ... 20-12-nos/

Part is called 138065002B as far as I can tell

Might also try ebay

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Post by Blairio » Fri Sep 20, 2019 3:50 am

That's great, many thanks Acidbob. I'll pass this information on to my pal (another Bob).

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Post by acidbob » Fri Sep 20, 2019 6:02 am

Dont trust anyone called Bob, just saying !

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Post by Panason » Fri Sep 20, 2019 6:06 am

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sutekina bipu-on
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Post by sutekina bipu-on » Fri Sep 20, 2019 7:09 am

There is a really good chance the issue is with the ribbon cable between the keyboard and the mainboard, or is a diode. The ribbon connectors get corrosive over time and can be repaired easily if you find that to be the issue,

If you have ruled out the ribbon cable as a potential issue you should attempt to check all the keyboard matrix diodes as that is the most likely reason you have a number of keys but not out, or some keys that only work sometimes in keyboards of this age. you can simply jump the diodes and see if the keys come back to life.

There is not much chance at all the keyboard controller IC is at fault if any keys work at all, or it's not half and half of the keyboard that's out.

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Post by Blairio » Fri Sep 20, 2019 7:56 am

sutekina bipu-on wrote:There is a really good chance the issue is with the ribbon cable between the keyboard and the mainboard, or is a diode. The ribbon connectors get corrosive over time and can be repaired easily if you find that to be the issue,

If you have ruled out the ribbon cable as a potential issue you should attempt to check all the keyboard matrix diodes as that is the most likely reason you have a number of keys but not out, or some keys that only work sometimes in keyboards of this age. you can simply jump the diodes and see if the keys come back to life.

There is not much chance at all the keyboard controller IC is at fault if any keys work at all, or it's not half and half of the keyboard that's out.
Thanks, I will pass this on to my pal. I know that he has disconnected, cleaned and reconnected the ribbon cable , but that the block of 8 notes , (in a group of 8 rather then randomly spread across the keyboard) is still not working.

I think that grouping of the 8 notes should in itself be a diagnostic, but I am more of a player than a tech, so maybe I have that wrong.

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Post by rowsbywoof » Fri Sep 20, 2019 8:05 am

If the “dodgy” looking site was http://www.thesoniq.com/, I can vouch for them. The owner of that site is an old Ensoniq tech, and a freaking standup guy. I’ve bought quite a few parts from him, and he’s incredibly honest and helpful. If he hasn’t visited http://www.thesoniq.com/ for Ensoniq parts... Then he should.

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Post by Blairio » Fri Sep 20, 2019 12:16 pm

rowsbywoof wrote:If the “dodgy” looking site was http://www.thesoniq.com/, I can vouch for them. The owner of that site is an old Ensoniq tech, and a freaking standup guy. I’ve bought quite a few parts from him, and he’s incredibly honest and helpful. If he hasn’t visited http://www.thesoniq.com/ for Ensoniq parts... Then he should.
Hi,, and thanks for the info - I have passed it on. The site my pal was concerned about was a polish one. It seemed to list a huge amount of hard to get stuff, but had pictures of nothing.

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Post by rowsbywoof » Fri Sep 20, 2019 1:05 pm

Blairio wrote:
rowsbywoof wrote:If the “dodgy” looking site was http://www.thesoniq.com/, I can vouch for them. The owner of that site is an old Ensoniq tech, and a freaking standup guy. I’ve bought quite a few parts from him, and he’s incredibly honest and helpful. If he hasn’t visited http://www.thesoniq.com/ for Ensoniq parts... Then he should.
Hi,, and thanks for the info - I have passed it on. The site my pal was concerned about was a polish one. It seemed to list a huge amount of hard to get stuff, but had pictures of nothing.
Ah, gotcha. Yeah, my first thoughts were: Yeah, thesoniq.com definitely is a dodgy looking site... but that's because it's run by an older guy who actually prefers to chat over the phone than over email... So... It sort of makes sense. He's been great, though, in tracking down some hard to find things (like a couple lens covers for Fizmos that like to go missing, and other oddities that you just aren't going to find elsewhere). He's also just a good wealth of tech knowledge who might be able to steer your friend in the right direction with a fix, so I'd shoot him an email... He does prefer the phone, though, so he might be a little slow to respond, but he will. LOL.

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sutekina bipu-on
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Post by sutekina bipu-on » Fri Sep 20, 2019 8:08 pm

Blairio wrote:
sutekina bipu-on wrote:There is a really good chance the issue is with the ribbon cable between the keyboard and the mainboard, or is a diode. The ribbon connectors get corrosive over time and can be repaired easily if you find that to be the issue,

If you have ruled out the ribbon cable as a potential issue you should attempt to check all the keyboard matrix diodes as that is the most likely reason you have a number of keys but not out, or some keys that only work sometimes in keyboards of this age. you can simply jump the diodes and see if the keys come back to life.

There is not much chance at all the keyboard controller IC is at fault if any keys work at all, or it's not half and half of the keyboard that's out.
Thanks, I will pass this on to my pal. I know that he has disconnected, cleaned and reconnected the ribbon cable , but that the block of 8 notes , (in a group of 8 rather then randomly spread across the keyboard) is still not working.

I think that grouping of the 8 notes should in itself be a diagnostic, but I am more of a player than a tech, so maybe I have that wrong.
I would bet money on a bad diode or 2. Have him jump the keyboard matrix diodes until those 8 come back to life! Then you simply put a new diode in its place and you're all good. I've fixed a DX7, W50 and ESQ1 keyboard this way so if it's not that i'll be very surprised.

The bigger issue is really what caused the diode to fail, but if everything else is good it may not be a need for concern.

Thesoniq is great, agreed, but prices are a bit high and last time i needed an esq1 part (display board, so probably the most in demand part possible) he didnt have one, but hopefully he has keyboard ic's if the diodes are all good.

Be sure to download the esq1 service manual if you/he hasnt.

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