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Author Topic: Unknown part.  (Read 611 times)

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Offline eurgencaTopic starter

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Unknown part.
« on: January 13, 2021, 08:19:20 am »
Hello.
Can someone tell me what is this unknown part. It is act like open circuit.
Thanks, Sebastijan.
« Last Edit: January 13, 2021, 08:21:44 am by eurgenca »
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Offline ataradov

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Re: Unknown part.
« Reply #1 on: January 13, 2021, 08:56:55 am »
Where was it found? It may be a spark gap, in which case being open circuit is normal.
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Alex
 

Offline eurgencaTopic starter

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Re: Unknown part.
« Reply #2 on: January 13, 2021, 09:05:58 am »
PSU in star tps100 printer. It is between a1 and a2 on triak.
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Offline eurgencaTopic starter

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Re: Unknown part.
« Reply #3 on: January 13, 2021, 09:23:32 am »
AC line is feeded to bridge rectifier through triac. On DC side I get 25V. Triac is controlled by opto from secondary. If I bridge A1 and A2 PS starts.
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Offline ataradov

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Re: Unknown part.
« Reply #4 on: January 13, 2021, 05:50:22 pm »
This must be a spark gap. I see no other element that would make sense across a triac. Something else must be wrong.

It is hard to see on the picture. Look though the glass with good magnification and see if it looks like something looks damaged or it looks like the circuit should not be open.

It is possible that it is supposed to have low trigger voltage and they are relying on it to initially conduct to start, but that would be a very strange design.
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Alex
 
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