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Messages - freshmex18

#1
Success!

Pedal is working again!  Thank you so much for the one-on-one troubleshooting.  It is greatly appreciated.  Such a high level of customer service around here.

So I was right that one of the components in the area of the BBD was at fault after the pedal went up in smoke (it wasn't really that much).  Replacing the lot of them did remove the faulty component.  It was my error of putting a 330k resistor in place of the 10r that kept the pedal from turning on and working afterward.  I still have absolutely no idea how I cocked that up.  Did I somehow look up R23's value instead of R38?  Did I accidentally put a 330k in the 10r bag during a previous build?  Who knows.  Totally my fault

And the best part is that the new BBD has eliminated the ticking in bypass.  For now at least.  Here is hoping it stays that way.  For now, everything is working as it should.

Thank you again.  This is why I keep coming back for more boards.  Happy to support you
#2
So next step is to replace everything and see if it works?
#3
So both of those parts are ones that I replaced as possible causes of the smoking.

And you called it.  Somehow, I replaced the 10R with a 330k.  I have no idea how I even did that.

R38 was reading -1.153 on the top pad with the 330k.

R38 now reads -15.56 on the top pad

C37 is correctly oriented

IC 1 now reads
-7.83
-7.83
-7.79
-15.56
-7.75
-7.83
-7.84
0.0
#4
D1
Cathode -17.64
Anode -17.36

Output leg of regulator
-15.67
#5
Hello?  Anyone still here?

I reflowed all of the connections again and got a new, better multimeter.  Whichever it was that helped, here are the new readings with the daughterboard and all ICs but IC1 removed

IC1

-0.582
-1.67
-1.741
-1.151
-0.888
-0.521
-0.473
0.0
#6
With daughterboard and all ICs but IC1 removed

IC1
9.15
2.21
0.62
1.09
0.61
2.22
8.87
17.42
#7
I have the very first version of the circuitboard.  Is there anything different about that board with the documentation on the site vs the current version?  The current documentation shows DC In connected to the long terminal of the DC jack and Ground connected to the short terminal and that is what i have currently.  I did disconnect those wires when troubleshooting and reconnected them as per the current documentation
#8
Is there a different procedure for reading voltages on a positive ground circuit like the Tourbus that I am not aware of?
#9
Diodes seem fine

IC1
9.10
5.38
4.94
3.24
4.94
5.35
9.14
17.44

IC2
2.06
0.6
0.6
3.23
6.54
0.27
11.71
2.87
2.88
11.78
0.82
6.21
17.44
0.59
0.59
2.15

IC3
9.44
6.26
5.71
3.57
5.71
6.22
9.14
17.43

IC4
9.68
1.25
1.16
1.97
1.24
1.17
9.69
17.42

IC5
8.44
8.55
0.61
17.42
17.41
17.40
1.97
1.97
1.97
5.80
5.79
1.96
6.12
17.42

IC6
9.23
7.93
7.87
5.67
7.87
9.96
9.21
17.41

IC7
17.42
5.65
0.04
0.05
1.99
5.65
0.02
0.13

IC8
9.19
7.00
6.50
5.68
8.15
8.35
9.19
17.41

IC9
17.42
5.65
0.04
0.04
1.99
5.65
9.20
0.18

#10
Had a working Tourbus pedal.  Been a few months since I used it.  Built a new pedalboard.  Plugged it into the same 18V plug on the OneSpot power supply on the new board.  Noticed the pedal ticking in bypass.  Opened it up to take a look and adjust the trimmers to see if I could get the ticking to stop.  After a while, a tiny puff of smoke from the region of the 4047 IC.  Panic ensues.  Cut the power.  Removed daughterboard.  Could not confirm the origin of the smoke.  Replaced all of the components in the immediate area of the 4047 including the IC.  Reflowed all connections on main board.  Pedal is not powering up.

How should I proceed?  Is there troubleshooting to be done or does smoke = trash the bus and start again on a new board?
#11
Also, the volume pot works in reverse regardless of what position the 3PDT is in. 

Anyone?  Any ideas?
#12
Yes, I meant I reflowed all solder joints

Here are the requested pics.

https://imgur.com/gallery/Ad7kJjx
#13
Tech Help - Projects Page / Tourbus Troubleshooting
March 07, 2023, 09:59:33 AM
I am having trouble getting the Tourbus to work (again).  I got it working a while ago and put it aside for a while since I didn't have an enclosure to put it in.  Cut to today when I went to box it up and it doesn't work anymore.  When I plug it into the power source, the two LEDS light up.  When I plug in the output jack, the LEDs turn off and will not turn back on.  Signal passes through but there is no delay.  The volume knob also works but in reverse.  If I hit the stomp switch, bypass works just fine.  This is if the PCB is in or out of the enclosure.  I went over every single connection with a soldering iron to be sure there was nothing loose.  I am stumped.  Anyone have any ideas?
#14
I've been emailing with the good folks at SmallBear about bringing back a transistor set for the Mark 1 Tonebender and they just added it to the store.

https://smallbear-electronics.mybigcommerce.com/transistor-set-tb-mk-i-pnp-generic/

I'll let you know how it sounds after I get my order and get the thing built