Thanks Paul! I wonder how you can read that 802 sysex implementation manual, I tried but I'm lost really. Looks like you have to put together separate pieces...
i decided to replace 3 old capacitors i used original values except i put the biggest 4700mf 35v instead 4700mf 16v polarity was ok after power on i saw for...
i measured voltage on the main board (white boxes) and i have 3.1v instead 5v and 15.2-15,3 but it sees to be ok so voltage regulator gets fired, right? can i...
It is OK to replace a capacitor with a new one that has the same microFarad rating but higher voltage. You can replace a 4700uF (microfarad)/16 volt cap...
thanks for reply input voltage is little more than 10v but output is 3.1v so its voltage regulator for sure maybe electric charge damaged it when i solder...
Firstly, hello. Secondly, I will apologise if I cover old ground. I have recently acquired a TX81Z, and have discovered it is v1.1. Unfortunately my research...
TX81-Z ROM version had a different checksum calculation when writing a voice data bank than the checksum calculation used when reading a voice data bank. ...
You can replace IC3 with a standard 7805 three-terminal voltage regulator. Add a small heat sink because it is sinking about 600-700 milliamps and will get...
Hi! The last OS version V1.6 is in the Files section: http://launch.groups.yahoo.com/group/yamahablackboxes/files/Tx81z/ as Loscha postet it here a few years...
I can send a V1.6 eprom to whoever needs one. Since Yamaha owns the rights to this firmware I only charge for the eprom and the shipping. Email me directly for...
i replaced voltage regulators to ST L7805CV and unit works but i still see some ripple at about level -72db maybe its normal because this unit is not super...
Congratulations on a successful synth repair!  A -72dB signal is very low. Is that on the output audio of the synth? How many milli-Volts is that?  ...
math is everyones best friend when modulating fm synthesis. while real time controls may not sound smooth at times, time programmed sequential steps generally...
Hi everyone, I'm jumping into this thread to share my experience. I have a TX81z, a TX802, and now a Korg DS8. I have been testing a Behringer BCR2000...
Hi Hernan you probably already know, but the data stream from the BC can be thinned dramatically but programming it to wait a number of milliseconds after the...
Oh, I didn't know that! Anyway, tweaking FM in real time as a performance is a bit unpredictable and can jump to harsh. Unless you make noise music, I still...
So, I have TX81z that seems to function normally but there is no audio from the line outs or headphone out. I do hear a audible click on power up and another...
lookin the files section for the schematics cant remember with out looking but on most of yamaha gear there is a transistor switching circuit for thud...
The TX81Z doesn't use a coil. The transistors (Tr1, Tr2) short the audio outputs directly to ground when the protection circuit (around Tr3,Tr4,Tr5) is active....
Thanks, Jesse. you helped confirm I was looking in the right place for the protection circuit jammie was talking about. Considering the external condition of...
like i said with out looking at the schems i was only pointing to what yam did on most of its synths so listen to jesse as he has nailed it on the head i just...
Also check the electrolytic capacitors visually - look for any leaking or bulging, especially of the tops. Watch <http://www.youtube.com/watch?v=wpl8AHUgcUU>...
I took a look at your picture. Is that a worn spot on the transformer (middle of green band)? It looks like exposed metal. It might be shorting against the...
Hello to all from Italy (pls forgive my bad english). I own a now dead FB01 which, chained with a guitar digital multieffect, was used mainly as a "distorted...
disco dsp phantom reads 4op sysex data i have been trying the converted .opm files on it along with my tx81z and its preaty close it also has a filter so that...
hey pal padkuz, i know a great person in the yamaha dx7 group which has made a program for the pc to convert sys ex patches..although it does no litteral...
