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Subject: Ungar 9900 Soldering Iron Base Station

Complaint: Dead

Diagnosis: Secondary on power transformer is open

Reason: Shit tier QA at factory didn't notice a wire strand bridged across the power transformer output.

Hard to believe they missed that, it's one of the strands from the power transformer's wire. I can't fix it as-is, it will need a replacement transformer or an external transformer. Can't use DC because this particular model uses a light dimmer-like circuit (Triac) to control the heater of the iron.

Subject: Ungar 9900 Soldering Iron Base Station Complaint: Dead Diagnosis: Secondary on power transformer is open Reason: Shit tier QA at factory didn't notice a wire strand bridged across the power transformer output. Hard to believe they missed that, it's one of the strands from the power transformer's wire. I can't fix it as-is, it will need a replacement transformer or an external transformer. Can't use DC because this particular model uses a light dimmer-like circuit (Triac) to control the heater of the iron.

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[–] • 1 pt (edited )

Have you got a pic of the whole unit? We might have seen the transformer in something else but yes, it should be fixable.

QA is always a bit human-variable, that's why it should be automated whenever possible, and they couldn't have done a HV test in that part of the circuit to identify it

[–] • 0 pt

It can be fixed, but the chances of finding a transformer for a 30+ year old device like this is slim to none, unless it's harvested from another unit. It's not really worth trying to do that since other parts, like tips and heating elements aren't readily available either.

I plan on cobbling together a 24VAC transformer from some stuff here at the house to make it work, and use it for as long as it lasts. Beyond that, cheaper just to get a new Hakko unit with supplies.