got a new astro city here that i hurt by either plugging a board in backwards.( jamma key was funny but dumb mistake)or moisture.cab had been in shed for a while.a bit of a smoky smell and no life in the cab entailed. i let it dry out for a few days changed the fuse in the power supply which was a goner so i hoped it would just switch back on but no joy..
so ordered a jamma power supply and did this hack/workaround mentioned here to keep existing wiring https://forum.arcadeotaku.com/viewtopic.php?t=32406
again turned on cab and fuse just popped instantly..
so where do i go from here to troubleshoot.. i have a multimeter but have always been fairly noobish with regards to cabs..
is it best just to cut my losses and sell on as a project cab if i am not technichally minded??
or anyone in scotchland who can fix it for me
thanks
Last edited by charlie chong on November 3rd, 2017, 1:50 pm, edited 1 time in total.
Hey Charlie, same thing happend with my cab and the fuse. Ended up being a bigger problem and got a tech to take the whole PSU away for work. Hit me on the twitter if you need to talk about it. B
You have a short somewhere. Disconnect everything from the PSU and leave only the 100VAC input. Turn it on and see if it pops the fuse. If it does, the bit that you're connecting the new PSU to is likely at fault.
thanks nem will try that for a start! so i should just disconnect everything from the power supply except the ac live and neutral and see if the fuse pops again?
with cn03 plug (+12 +5 -5)detached from power supply and 2 remaing plugs left fuse pops..
when i disconnect the smaller plug with this pinout (below the ac plug)
otl nc otn
otl nc otn
otl nc otn
the fuse doesn't pop and the light comes on the new astro city power supply and my jamma supply..
anyways i wont touch anything else until further instructions
so i guess this means the power supplys are ok and something else is shorting it out ??
Last edited by charlie chong on November 3rd, 2017, 4:27 pm, edited 1 time in total.
OTL is AC OUT live, OTN is AC OUT neutral. That's 100VAC going to the monitor and marquee light I think. I don't have this PSU, but that's my guess. Either one is shorting.
Last edited by nem on November 3rd, 2017, 4:30 pm, edited 1 time in total.
i guess now i need to plug in the cno3 and the ac at the same time with the same one disconnected so i know it's definitely that plug popping the fuse..
oh well at least we making some headway
if its the marquee shorting i will kiss the ground and praise the lord
will do gonna pull off the hood off this beast
been about ten years since i sold my cabs so if i remember you got to disconnect a speaker wire when taking off the top right??
You can disconnect the marquee power supply from the main door below the control panel. Its pinned to the left of the cabinet with those straps, a blue+pink wire (100v) that go up inside the cabinet. There is a 2 pin plug you can disconnect
snipped the marquee but sadly the fuse popped again so i guess we have monitor woes
at least i know where the problem is i guess..
so will this need to be sent off to be repaired you think??
DaveyD wrote:You can disconnect the marquee power supply from the main door below the control panel. Its pinned to the left of the cabinet with those straps, a blue+pink wire (100v) that go up inside the cabinet. There is a 2 pin plug you can disconnect
my wiring is different.i got a green and orange wire and no plugs just runs up to to the marquee.. i just snipped em and covered the ends with electrical tape for the meantime
removing the chassis sounds fun.i will take a look after my dinner.should i try take a few pics??
i think this may be beyond my expertise now and a job for grantspain or some other expert i should pay to fix.
Grant's your man, however, you still need to remove it to send it to him. Might as well have a quick look yourself.
You need to pull out the monitor, then discharge the tube, remove anode cap, ground wire from neck board, neck board from tube, degauss wire and yoke wires from chassis and then chassis from frame.
