BOSS SYB-3 Surface mount question

[GREEN FUZ]

I`ve acquired an SYB-3 cheap, on account of it`s malfunctioning. Getting sound in bypass mode and dry signal only, when in circuit. It occasionally randomly passes effected signal which leads me to believe the chip is okay. Trouble is I have no control over when this happens.
Having had a good look at the board it appears one of the diodes may be blown. I have no idea whether this is the cause of the problem but replacing it seems like a good place to start.
Here`s the rub.
Not being at all familiar with SMD components I`ve tried looking up the code number on the net. It seems the same code number is often used for different parts. Why? I`ve no idea.
As far as I have been able to work out it`s an SOD523 package silicon diode but that`s as far as I`ve gotten.
Any help/advice appreciated.
Oh yeah, the code is C1.


Edit:Forgot to ask if there was a readily available non SMD substitute for the aforementioned component.

[GREEN FUZ]

YA DON`T SAY!!!!!



I knew I should have sexed up the subject title a bit. Mention of SMD`s seems to have scared everyone off.

That said, I know some forumites use them without fear. Perhaps I should have provided more information. Other than providing a picture ( difficult with a broken camera) I can`t think of what else to say. This is more of a desperate "bump" than anything.

[Paul Perry (Frostwave)]

It's unlikely that the type of diode is critical. So I'd just say, 1N4148.
Hope you can get it running, the SYB-3 is an interesting toy. Now they are out of fashion, I would grab any that seem reasonably priced.

[Bernardduur]

I had the same problem a while ago; I just send it to Boss and they tried something, but a few weeks later the unit malfunctioned again. I send it again to Boss (free) and they completely renewerd the PCB. Now it works fine (for 3 years )

[GREEN FUZ]

Thanks for the suggestions guys. I replaced the diode but it didn`t make much difference. As for sending it to Boss, even if it was still under warranty, which it isn`t, I would have invalidated it by meddling about . Guess I`ll have to keep pokin` around. Thanks again.

[gez]

It's probably just a dodgy joint.  Push down on various parts of the board to see if you can locate the problem, then reflow joints in that area.

As for the same code being on all the parts, the devices I use have values printed on them so unless they've used the same value resistor/whatever as much as possible for reasons of economy, the code probably indicates the size of the component used, and you're in the dark as to what value has been used.