Does this mean this diode is bad.

[Locrian99]

I’ve built several pedals but this is a little different than what I’ve done so I’m double checking i am right.

I have a very large pedal with smd components that’s doa. I think I’ve found the protection diode a sr24. Leaving it on the board I used the diode test function on my multimeter got 179. Data sheet shows forward voltage drop should be 0.5. Is this a bad diode then? I don’t want to do more damage taking it off will be my first smd soldering… which I’ll do I just want to double check I’m not barking up the wrong tree so to speak.

Thanks

 

[fig]

Measuring in-circuit components does not always yield the expected results.

 

[Barry]

I'd check to see if you're getting voltage across it

 

[music6000]

As Barry said, Get your DMM & measure Voltage by Black probe to Ground & Red probe on either side & diode!
Should be .5v Voltage Drop ie 9.2v - 8.7v

 

[Locrian99]

So this is kind of on hold. I was getting voltage too the switch (a weird sort of dpdt momentary thing). But couldn’t find any after it. I don’t recall if I checked that particular component. In the vicinity of the switch there was a cap and resistor getting 9.3. I had continuity at the switch, I ended up taking the little plastic top off it and one of the little metal pin pieces was kind of bent, it doesn’t appear to be working correctly. I have a new switch coming from Spain (only place I could find). It’s a boss rc 300, I got DOA hoping to be able to fix it. When the switch arrives I’ll swap it and check for voltage at diode makes sense. Here’s a couple pictures in case anyone is curious what it looks like. Those little pins sit in the switch, and the back two pins have power it appears the center two are connected to ground and the front two appear to have no connection. Thanks guys, hoping I can manage to keep this out of the landfill and we’ll use jt.

 

[Chuck D. Bones]

HOLY CRAP! Look at all of the parts! If you can't find the problem right away, you may never find it. Do you have a schematic?

 

[Locrian99]

HOLY CRAP! Look at all of the parts! If you can't find the problem right away, you may never find it. Do you have a schematic?

I don’t it’s a boss rc300, I haven’t had any success in finding one online. I just got the replacement switch in today. Going to replace that first, just crossing my fingers on that one lol. Figure I’d swap that and then see if I’ve got power to that diode. Though it’s a momentary switch and from what I can see so far if the pins are numbered like this

1. 6
2. 5
3. 4

1/6 appear to have no connection
2/5 are connected to ground
3/4 are +9V

Switch appears to ground out the 3/4. There is power getting to the switch. There’s a resistor and cap between the jack and switch where I see power (I know these are before based on having 9.3v vs 9.08 at the switch). Anyways hoping to have some time this weekend to mess with it. See what I can figure out. Other than the switch and those two parts I haven’t found power anywhere else. There is continuity between 2/5 and pin 4 on the 4558’s on the board and other obvious ground points.

 

[Sturdag Lagernathy]

More parts= Moar Mojo??

 

[Chuck D. Bones]

To me, more parts just dilutes the mojo.

 

[Locrian99]

This thing is one permanent hold. The switch I ordered is incorrect, well the switch I was shipped. Which I was fairly certain was correct. I might’ve lost my 20$ gamble on this thing.