Please help me with debugging new TS808

[bancika]

Hi,
I've just finished my first build and of course i have problems
I made millenium 2 board with 2N3904 collector-base as low leakage diode and 1N914 as high leakage. FET is BS170. You can see millenium here
and main PCB here
That DPDT switch selects between jumper and one more 1N914 clipping diode
1st problem is that LED is always on, no matter if switch is ON
2nd when switch is on bypass works well (with LED on) but I get no tone when I turn it on.
Any tips for a noob, where to start looking for trouble , etc
HUGE thanks!

[bancika]

and here's one inside the box

[bancika]

and here are voltages:

IC1
p1: 4.4
p2: 4.5
p3: 4.3
p4: 0
p5: 4.3
p6: 4.5
p7: 4.3
p8: 8.85

Q1
E: 2.57
B: 2.34
C: 8.8

Q2
E: 0
B: 0
C: 8.8

D1:
A: 4.38
K: 4.46

D2:
A: 4.5
K: 4.38

D3
A: 4.05
K: 4.5

Any ideas, please, please

[nero1985]

mmmmmmmm I would say get a 3PDT switch, it would make everything reeally easy, www.pedalpartsplus.com i get them there for $4

BTW i like that surface mount Millenium board

[petemoore]

Q1
E: 2.57
B: 2.34 The base must be a diode drops voltage Above the Emitter...
C: 8.8  ...ok...To V+ it seems
 
Q2
E: 0
B: 0 No signal will get past here...
C: 8.8
  I'd be checking connections [also /N/C's where No connection is called out] and resistances around these transistors.

[didier]

and here are voltages:

IC1
p1: 4.4
p2: 4.5
p3: 4.3
p4: 0
p5: 4.3
p6: 4.5
p7: 4.3
p8: 8.85

seems ok

Q1
E: 2.57
B: 2.34
C: 8.8

also seems ok *Edit* hehe missed that one... ofcourse its not ok misplaced tranny?

Q2
E: 0
B: 0
C: 8.8

doesn't seem ok...
looks like the transistor isn't seeying any signal... check if you have dead joints, any unconnected parts...
if you have an audio probe you can track untill where the signal gets.

or
follow the path back from the base of Q2 with a DMM and check wehre the signal is lost

[petemoore]

E: 2.57
B: 2.34
C: 8.8
  Dunno...looks like the base here is @ lower V than the emitter, and should be one Si Diode Drop's voltage above the emitter...

[bancika]

Q1
E: 2.57
B: 2.34
C: 8.8

also seems ok *Edit* hehe missed that one... ofcourse its not ok misplaced tranny?

I don't undestand, what should I do? Sorry for dumb questions, but I'm really new at this
What about LED that's on all the time, what could possibly be wrong about it? Just to make sure, as low leakage diode in millenium 2 I used 2N3904 connected with pin 2 to ground and pin 3 to anode of high-leakage 1N914 diode. I cut pin1. Is this ok?
Thanks!!!

[petemoore]

The resistanes hold the device in or not in bias. A wrong value, cold solder, bridge, or...did you use heat sinks when soldering the transistors?. Sockets allow easier debugging of suspect tranny's.

[didier]

on the picture of the inside view i wonder... it seems like there is a red wire going from the DC-jack to the (input??)jack (the black one on the left) why??? i hope you did not connect the input to the battery voltage!

also i dont understand, is that the layout from tonepad???
if it is, i dont understand where the yellow wire is going... also the white one seems to be misconnected
verify if you wired the millenium correctly!

if you did not use the 3 diodes for asym clipping, did you install the jumper? its not clear in the picture because a wire kind of is in front of it... check if you installed all the jumpers when you did not use a component...

[bancika]

I didn't use colors correctly, but I think DC is wired ok. I wired tip of DC jack to shield of input jack (star ground point), DC is center-negative. 3rd diode is on DPDT switch, you can choose between jumper and diode. Yellow wire goes to that switch. Whie wire is output and is connected to middle lug of stopm switch (I used offboard wiring diagram for millenium with DC, I just ommitied part with battery holder cause I don't need it).
Layout is from tonepad.com.
I checked connections around transistors and they are ok, transistor's legs have contact with board leads, so maybe one of them failed. I didn't use heat sink when soldering them. I guess that can be a problem.
Millenium 2 is wired exactly like on diagram on geofex. CNT is wired to top lug on stomp, ground to star ground point and 9V to DC jack.
Is that correct?
Thanks you for your time!