e-licktronic Forum

guitarsucks

Hey. You need an oscilloscope. Connect probe tip to TP5 ( its called out in the original TR-808 service manual - take TP5 from the correct side of R375 (470K) can't recall which side at the moment- you can also get a reading off components directly connected to R375) in the handclap section, connect...

guitarsucks

Hey thanks for the reply (ies). What is described above, is pretty much to a T with my experience. At first I thought I must have missed something, some backwards component, or some component gone wrong or a ground short; pulling my hair out, you wouldn't believe how many times I've checked everythi...

guitarsucks

Hello, I have finished my build and i have been troubleshooting a few issues. When testing the trigger outs 1 and 2 by hooking up to my SH-101 there was a terrible hum. Searching the forum brought me to this link where a user has had very similar issues with a ground loop : http://www.e-licktronic.c...

guitarsucks

The batch/date code on the texas instrument CD4011BE that came in my yocto kit is 10HMAND. Hope that helps. cheers

guitarsucks

I can also confirm that with the supplied CD4011BE chip for IC6 in the Accent section, R151 smoked and burnt. As recommended by keen I changed the chip to UB(E) version and now all is well. Solved 151 problem as well. The chip I put in is : Texas Instruments - CD4011UBE Thanks a bunch for the info. ...

guitarsucks

Thank you, got it.

Seems like pin 1 and pin 4 (also indicated by the pinout in the 6n138 data sheet ) are not linked so i'm fine for that IC.

Now for more troubleshooting fun. I'll post my other issues R151 burns, wacky sequencer/ trigger woes in another post shortly.

Thanks again.

G

guitarsucks

Thanks for the reply,

I've got the schematics and the Main board PCB layout, I've been over them lots, IC4 (74HC595) of the sequencer section is there, but i can't find IC4 (6N138) of the I/0 board anywhere in the schematic. I must be missing something?

G

guitarsucks

Hello there, I have had the misfortune of burning the pad off pin 4 of IC4 on the I/O board. I've socketed it and i had to desolder/resolder it.. unfortunately its gone. So i need to relink it to the proper point with a jumper. with all the rosin mess i can't see the trace lines on the pcb where the...

Search found 8 matches

Re: TM3 calibration

Re: Ground loop between signal and PSU ground on the main bo

Ground loop between signal and PSU ground on the main board?

Re: r 151 accent resistor burns

Re: r 151 accent resistor burns

Re: IC4 1/0 Board burnt pad off pin 4.

Re: IC4 1/0 Board burnt pad off pin 4.

IC4 1/0 Board burnt pad off pin 4.