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AMI E JUNCTION BOX TRANSFORMER
I was working on my ami e-120 when i shorted the credit light out.
blew a fuse. replaced fuse and when i plugged it in the transformer started to smoke. besides my stupidity can someone tell me what would cause the transformer to smoke. i have another transformer that shows 36 volts coming out of it but want to make sure i dont have something else wrong before i install it. thanks in advance norm |
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#2
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AMI E JUNCTION BOX TRANSFORMER
em pinball wrote:
I was working on my ami e-120 when i shorted the credit light out. blew a fuse. replaced fuse and when i plugged it in the transformer started to smoke. besides my stupidity can someone tell me what would cause the transformer to smoke. i have another transformer that shows 36 volts coming out of it but want to make sure i dont have something else wrong before i install it. thanks in advance norm Check if the bridge rectifier is shorted. Often people replace the original Selenium Bridge Rectifier (has green plates stacked on a shaft and the AC/DC leads are soldered to lugs sticking out from the centre shaft) with a more modern Silicon Bridge Rectifier (usually a black square with four lugs sticking up), however they do not fuse the AC side of the new bridge...leading to transformer failure if/when the new bridge shorts out! Fuse the AC lead to one side of the bridge (assuming this in NOT a center-tapped transformer - in which case BOTH AC leads are fused with 1/2 the value just below) with a slo-blow fuse no larger than the total current of the fuses that split from that circuit - a 1A and a 1A5 fuse I think, for a total of 2A5 (read that as 2 point 5 Amp) slo-blow fuse. There is also an Electrolytic Capacitor in the metal box that needs to be checked for a short circuit... John :-#)# -- (Please post followups or tech enquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#3
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AMI E JUNCTION BOX TRANSFORMER
On Jan 23, 8:59*pm, John Robertson wrote:
em pinball wrote: I was working on my ami e-120 when i shorted the credit light out. blew a fuse. replaced fuse and when i plugged it in the transformer started to smoke. besides my stupidity can someone tell me what would cause the transformer to smoke. i have another transformer that shows 36 volts coming out of it but want to make sure i dont have something else wrong before i install it. thanks in advance norm Check if the bridge rectifier is shorted. Often people replace the original Selenium Bridge Rectifier (has green plates stacked on a shaft and the AC/DC leads are soldered to lugs sticking out from the centre shaft) with a more modern Silicon Bridge Rectifier (usually a black square with four lugs sticking up), however they do not fuse the AC side of the new bridge...leading to transformer failure if/when the new bridge shorts out! Fuse the AC lead to one side of the bridge (assuming this in NOT a center-tapped transformer - in which case BOTH AC leads are fused with 1/2 the value just below) with a slo-blow fuse no larger than the total current of the fuses that split from that circuit - a 1A and a 1A5 fuse I think, for a total of 2A5 (read that as 2 point 5 Amp) slo-blow fuse. There is also an Electrolytic Capacitor in the metal box that needs to be checked for a short circuit... John :-#)# -- * * (Please post followups or tech enquiries to the newsgroup) * John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 * Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) * * * * * * * * * * *www.flippers.com * * * *"Old pinballers never die, they just flip out." i replaced the cable from the junction box to the carriage box, replaced the switch on the tone arm cam and the rectifier. got it working retty good now. problems no are in my button selectors. not many work. thanks for the help norm |
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