Keyboard does not reproduce any E note?

The EX5 features a unique Extended Synthesis system which incorporates a number of advanced tone generator technologies. AWM2, AN, FDSP and VL. The EX5 is one of the best keyboard Yamaha ever produced.

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rocknpop
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Keyboard does not reproduce any E note?

Unread post by rocknpop »

Hi guys, I have a lead to buy an EX5 for $300 shipped, but it has two issues 1) the E note doesn’t reproduce sound - E2, E3, etc... (weird) - the seller said it’s not a key issue it’s an electronic problem and 2) some push buttons need to be replaced (the typical soldering job we know about)

Related to #1 - how hard is it to fix? Is it even fixable?

The keyboard caps are broken but everything else looks to be in ok shape. Is it worth buying and repairing?


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Derek
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Re: Keyboard does not reproduce any E note?

Unread post by Derek »

Hi,

Keys are scanned internally via a matrix (a very common approach to cut down connections - e.g. a 61 note five octave keyboard only needs 12 + 5 connections, not 61), so that is symptomatic of a failure of a scan send or return lines (depending on the circuit design), which could be as simple as a bad connection, or it could be some deeper electronics circuit failure that would require diagnosis and correction.

I've never heard of the EX5 having switch problems, but I guess they could be getting to the age now. I sold my EX5s about three years ago and they were all working fine.

Personally I would say this one sounds like it has had a bit of a hard life. What are the photos like?

$300 is probably an OK price, but there is a risk that it might need a bit of work to get it going. Worst case it could be used as spares for another one.


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Derek Cook

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rocknpop
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Re: Keyboard does not reproduce any E note?

Unread post by rocknpop »

Hi Derek - thanks for the reply. The board looks to be in fair shape other than the caps being broken as usual. The owner said the keys were stored standing up and it was not used.

My guess is that it would only be good to use as parts given your analysis. At minimum the physical parts could be salvaged and the money could be made back. Seems like too much of a headache to get shipped though.


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