Low Voltage on Station

[John]

Hey Ray, I have the osdiy_22u + extension board and I started having issues on 2 stations due to low voltage (one on main board with ~15V, the other on the extension ~9V). I have been using the board for almost 3 years with no issues, this just started happening a couple of days ago.

All connections look good on the board, but I was thinking of starting with a reflow of the triac solder, based on the threads I’ve read. Any suggestions on what I should check to sort this out?

Thanks!

[John]

No go with reflowing, can anyone help with the troubleshooting steps? Thanks!

[Ray]

Maybe the traics need to be replaced?

[John]

Thanks for the reply Ray! Yes, this is what I’m going to try next. Ordered a couple of MAC97A8 0.6A/600V triacs and will replace all the zones that have issues.

[John]

Happy to report that I got the mainboard to work by replacing the triac (upon closer inspection I’ve noticed the previous one actually burned out). Not the best resoldering job, but it does work now 🙂

Now onto the extension – looks like on of the SMD resistors is also burned, what is the value I need to use for the replacement?

Also, any ideas why both burned out in the first place?

[Ray]

The SMD triac is BT1308W (or Z0103MN as an equivalent). The resistor next to it is a 2.2 ohm resistor (it’s just a current limiting resistor, you can actually directly short it out to bypass it). The damage is most likely caused due to shorted solenoid or some sort of high transient voltage.

[Author]

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