Anitoli wrote:Did you use regular 3mm led's?

Yes 3mm leds, though they are brighter than the oem red ones.

The very first one I did, I used 5mm leds and made the holes in the face plate a little bigger.

You mean the led's? If so i have changed all my FS's to match the LED colors on the heads and they work fine. Ahh, good. That's what I thought but this happenned while the upgraded footswitch was in use for the first time with this unit. Once we get this sorted I'm going to do a side by side test w...

So now that I am in a holding pattern for a min, what are your thoughts on my other question,

"Would changing the diodes in the footswitch effect the circuit in any way?".

M

Anitoli wrote:Ok got it. Will get this fixed.

Excellent, thnx bro.

Ready to go, all the nibblets point toward the plug side of the board.

You should have (1) 80c31 -40 pin, (1) 27c64 -24 pin, (1) 6n138 - 8 pin, (1) 93c46 - 8 pin, (1) HC573 - 20 pin, (1) HC574 - 20 pin. I missed either the 573 or the 574 chip. The other chips on there do not have anything to do with the midi circuit, they are for the second loop and the XLR BCO output...

Don't seem to have all of the chips . .

I will start with what I have

Ok, change out all the MIDI chips. I find it's easier to take out the board and have it on a flat surface. Even though these are in ZIF sockets they still take some effort to get them in there. Also Mike to make insertion easier you may need to slightly bend the ic pins inward on a level surface as...

Footswitch plugged in No Lights No control

Footswitch unplugged No lights No control with head unit switches

Only ch 1 all pots work on ch 1

Anitoli wrote:That sounds right, 7 volts feeding the 7805- 5 volts out to the midi board. So now there is no switching or led's?

Only channel 1 no leds or switch control

Ok , now with it hooked up is the voltage staying at 5vdc? From the image you marked http://musiciansroadhouse.com/download/file.php?id=13099 From the Transistor Purple X dc in to 7805 .. .. .. . I get 7.63VDC Yellow X on 7805 5vdc output. I get 5.03VDC Yellow x dc out to 7805. I get 7.62VDC Seems ...

Anitoli wrote: That is correct. Can you tell if the channels are switching even though you may not have LEDs?

Alas, no switching, no lights

Only the green channel

Here's what the midiboard look like in the 6101

20200319_122116.jpg Found a burnt spade connector, the red wire that runs to the first power tube, replaced that and replaced the transistor. When I removed the old transistor tere was no trace left under it. Had to run the leg down the trace on the board to solder. No LED lights yet https://youtu....

If the 7815-7915 regulators are functioning properly really no need. The midi's PS can fail for many reasons, and seeing how it may have failed before leads me to think there may be one or more shorted chips on it, but first things first need to get the midi PS producing 5vdc. Ok, good, I'm not goi...

Ok, so I have ordered transistors and more caps. My questions then are; Replace all transistors? Replace all caps? I also noticed that the transistor and closest cap have been replaced. If you look at the picture, the transistor is new ( it's shiny with a little rust on the top, were the other 2 are...