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Tech Head - The Technology Section
The Work Bench and Soldering Station
Metronic Dualis 441350 R108 value
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<blockquote data-quote="deltatango" data-source="post: 697092" data-attributes="member: 312296"><p>I have uploaded a picture of my power supply to help with identification, I still worry that your caps popped which is a sign of heat or distress, these supplies can generate spikes when their capacitors fail.</p><p>I would first check the 18volt zener with an ohm meter and see if it is short circuit, make sure mains power is removed for a few minutes first. If it is shorted then your IC has also blown, check also the resistor to its right (current Limiter sense).</p><p>Change the critical capacitors and the primary one these hold the key to its correct start functions.</p><p>Another favourite fault of these type of supplies is the large mains capacitor or the two resistors for open circuit, which will give no smooth DC voltage or no kick start.</p><p>If you have not changed the Primary capacitor 1000uf I would do so for a 105deg low ESR type this is important as it provides "feedback" to tell the chip data it needs to function in a stable manner via the smaller parts on the right side of its transformer.</p><p></p><p>I hope this helps regards from deltatango.</p></blockquote><p></p>
[QUOTE="deltatango, post: 697092, member: 312296"] I have uploaded a picture of my power supply to help with identification, I still worry that your caps popped which is a sign of heat or distress, these supplies can generate spikes when their capacitors fail. I would first check the 18volt zener with an ohm meter and see if it is short circuit, make sure mains power is removed for a few minutes first. If it is shorted then your IC has also blown, check also the resistor to its right (current Limiter sense). Change the critical capacitors and the primary one these hold the key to its correct start functions. Another favourite fault of these type of supplies is the large mains capacitor or the two resistors for open circuit, which will give no smooth DC voltage or no kick start. If you have not changed the Primary capacitor 1000uf I would do so for a 105deg low ESR type this is important as it provides "feedback" to tell the chip data it needs to function in a stable manner via the smaller parts on the right side of its transformer. I hope this helps regards from deltatango. [/QUOTE]
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The Work Bench and Soldering Station
Metronic Dualis 441350 R108 value
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