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Tech Head - The Technology Section
G-box fix....
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<blockquote data-quote="Vipersan" data-source="post: 897884" data-attributes="member: 325666"><p>Got to the root cause of this problem I think..</p><p>Shyte build quality ...the transformers are the cause of failurr imo.</p><p>Anyone who knows how transformers work will understand this.</p><p>All secondary loading was temporarily disconnected...and mains power applied.</p><p>Within an hour the transformer was warm to the touch..</p><p>This should NOT be the case.</p><p>The situation worstens if the secondaries are reconnected and the box remained in standby ...thus a small current being drawn.</p><p></p><p>Ok the new Cbox arrived this morning ...</p><p>The unit plugged in but left in standby...ie small current load..</p><p>the lid removed and the transformer touch tested ..</p><p>it remained cold to the touch.</p><p></p><p>Now back to the older Gbox.</p><p>The transformer is coated in a laquer ..which obviously coats and isolates the laminates but in close proximity..</p><p>I believe the laquer is acting much like the brown gunk removed from the pcb ..ie becomes resistive over time..and partially shorting together the laminations of the transformer.</p><p>The upshot of this ..is that the transformer runs warm ..and eventually hot.</p><p>This effect is caused by the magnetic eddy currents within the transformer core and laminations...</p><p>Eventully causing saturation and thermal runaway.</p><p>,,and the heat generated inside the unit causes all the other failures already sorted..</p><p></p><p>The only cure is to replace the transformer with one of a better build quality..</p><p>A genuine 240v transformer would ease the problem by having more volts per turn on the primary.</p><p>Sadly most imported crap uses a rating of 220-230v ....which runs the transformer slightly harder than we in the UK are used to.</p><p>I have an old NEC model 2025 stand alone positioner from the 80s ...with a physically similar transformer..</p><p>This may be my saviour ...as I can hopefully graft it into the Gbox case.</p><p></p><p>I ask again ..why do we put up with underated shoddy crap with built in life expectancy and destined for failure ?</p><p>Because manufacturers dont give a fook once they have your hard earned....and can save pennies on the manufacture.</p><p>Joe public demands ever cheaper ...so they cut corners ...and hope to sell you another in a couple of years..</p><p>It is just another example of the 'Throw away world in which we live'</p><p>cest la vie</p><p>Thank higgs I stockpile old and broken equipment.</p><p>We deserve better ..but we wont get it.</p><p></p><p>For reference hunt down the 'Lightbulb conspiracy'...watch and absorb.</p><p>I aint makin' this up.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 897884, member: 325666"] Got to the root cause of this problem I think.. Shyte build quality ...the transformers are the cause of failurr imo. Anyone who knows how transformers work will understand this. All secondary loading was temporarily disconnected...and mains power applied. Within an hour the transformer was warm to the touch.. This should NOT be the case. The situation worstens if the secondaries are reconnected and the box remained in standby ...thus a small current being drawn. Ok the new Cbox arrived this morning ... The unit plugged in but left in standby...ie small current load.. the lid removed and the transformer touch tested .. it remained cold to the touch. Now back to the older Gbox. The transformer is coated in a laquer ..which obviously coats and isolates the laminates but in close proximity.. I believe the laquer is acting much like the brown gunk removed from the pcb ..ie becomes resistive over time..and partially shorting together the laminations of the transformer. The upshot of this ..is that the transformer runs warm ..and eventually hot. This effect is caused by the magnetic eddy currents within the transformer core and laminations... Eventully causing saturation and thermal runaway. ,,and the heat generated inside the unit causes all the other failures already sorted.. The only cure is to replace the transformer with one of a better build quality.. A genuine 240v transformer would ease the problem by having more volts per turn on the primary. Sadly most imported crap uses a rating of 220-230v ....which runs the transformer slightly harder than we in the UK are used to. I have an old NEC model 2025 stand alone positioner from the 80s ...with a physically similar transformer.. This may be my saviour ...as I can hopefully graft it into the Gbox case. I ask again ..why do we put up with underated shoddy crap with built in life expectancy and destined for failure ? Because manufacturers dont give a fook once they have your hard earned....and can save pennies on the manufacture. Joe public demands ever cheaper ...so they cut corners ...and hope to sell you another in a couple of years.. It is just another example of the 'Throw away world in which we live' cest la vie Thank higgs I stockpile old and broken equipment. We deserve better ..but we wont get it. For reference hunt down the 'Lightbulb conspiracy'...watch and absorb. I aint makin' this up. rgds VS [/QUOTE]
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G-box fix....
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