Korg Poly800/EX800 Users group photo

Yahoo Groups archive

Korg Poly800/EX800 Users

Index last updated: 2026-03-31 23:23 UTC

Thread

Poly 800 Mk1 IC33

Poly 800 Mk1 IC33

2011-09-01 by cyllall

Hi Everyone,

I have a faulty IC33.
IC33 is a TC40H240 CMOS. Any reason why a 74** series equivalent won't work there?. I can't think of a reason unless the voltage is not 5v at that location. (can't test keyboard in bits).

Thanks
Martin

Re: [korgpolyex] Poly 800 Mk1 IC33

2011-09-01 by Michael Hawkins

It would have to be a 74HC240.

From: cyllall <cyllall@...>
To: korgpolyex@yahoogroups.com
Sent: Thursday, September 1, 2011 5:53 AM
Subject: [korgpolyex] Poly 800 Mk1 IC33

Hi Everyone,

I have a faulty IC33.
IC33 is a TC40H240 CMOS. Any reason why a 74** series equivalent won't work there?. I can't think of a reason unless the voltage is not 5v at that location. (can't test keyboard in bits).

Thanks
Martin