I probed with a scope from Q72 to IC67 pin 7....... :ugeek: :arrow: https://s16.postimg.org/nxpxi8bjp/Q73_Collector.jpg Refresher of the problem. Decay is little taps instead of a HiHat Decay... [video]https://www.youtube.com/watch?v=efsv6XGJ4PY[/video] I did notice during the probing that R452 is c...

Tried a new 74HC595N for IC112. Decay still not functioning...

Does the Start button work on its own?

HOLD DOWN "START" and "ENTER" to init your EEprom. Steps leds show you the progress of the initialization.

ALSO, you should really do all this BEFORE you stick it in a case.

KlangGenerator wrote:

hofmann25 wrote:IC112 & 111 just run the triggers right?

Yes, I know. I actually don't believe either that this will fix anything. But if you have them in sockets it would be worth a try. I found one user here reporting about HH decay problems in relation to those ICs...

Really? Where is the thread?

IC112 & 111 just run the triggers right?

I changed out ALL the IC's & I replaced the 2SA798 with 2x matched BC577's and there is no change!




What could this be???

Checked continuity will all components in the HiHat section. All connected! :idea: :arrow: Are pins 3-7 not used on IC70? https://s12.postimg.org/d6v4wkfy5/Screen_Shot_2017_03_12_at_12_19_29_PM.png https://s24.postimg.org/5imx7npyd/Screen_Shot_2017_03_12_at_12_46_04_PM.png I have checked ALL Compone...

cso5 wrote:Kacper,
Can you please tell me the type of glue you use to hold the board post on the case? Two of mine have fallen off.
Cheers.

Ditto............

Thanks KG, yeah I'm pretty much exactly on that trail. Almost finished checking all traces. Failing that I'll try replacing that double tranny, although I tested it before placing. Mind you I have tested ALL the parts before placing.

Soooo easy to break traces and via's....