The Aussie Pinball Arcade

Aussie Pinball Forums => Technical Matters => Pinball Training 101 => Topic started by: pinball god on May 11, 2009, 09:09:56 PM

Title: Measuring Shorts
Post by: pinball god on May 11, 2009, 09:09:56 PM
I suspect I may have a lamp socket that possibly shorting out and causing a fuse to blow. But I don't know how to see if a socket is shorting via a multimeter. Can someone explain how to measure a short? What setting on the mm and what to expect to see with and without a short, is the machine power on etc etc

Thanks
Title: Re: Measuring Shorts
Post by: ddstoys on May 11, 2009, 09:19:56 PM
If your multi meter has a BUzz setting use that if it has a short it will buzz
Title: Re: Measuring Shorts
Post by: pinball god on May 11, 2009, 09:25:22 PM
If your multi meter has a BUzz setting use that if it has a short it will buzz
Mine is a cheap DSE, it has the setting but no buzzer. Am I right in thinking if it shows 1 its shorting or buzzing? And the machine should be off, yes?? When I touch the probes of the mm it shows a value and apart = 1 just like ohms display
Title: Re: Measuring Shorts
Post by: ajlaird on May 12, 2009, 12:43:46 AM
A short across the socket will give you a reading of 0 Ohms.
Title: Re: Measuring Shorts
Post by: beaky on May 12, 2009, 01:39:45 AM
is it a gi lamp socket?
if it is isolate the socket or you will get a low ohm reading from all the other gi lamps and the transformer.
Title: Re: Measuring Shorts
Post by: pinball god on May 12, 2009, 07:33:40 PM
A short across the socket will give you a reading of 0 Ohms.
Thanks now I know what I'm looking for
Title: Re: Measuring Shorts
Post by: pinball god on May 12, 2009, 07:34:45 PM
is it a gi lamp socket?
if it is isolate the socket or you will get a low ohm reading from all the other gi lamps and the transformer.

it is part of lamp matrix B on a pin2000 so it can be one of 61 globes  ^&^
Title: Re: Measuring Shorts
Post by: ddstoys on May 12, 2009, 07:39:58 PM
Ive never dealt with a p2k machine but is there a plug you can remove to disconect all the lights?  Then if it still blows the fuse you dont have to check each light socket?
Title: Re: Measuring Shorts
Post by: pinball god on May 13, 2009, 08:57:24 PM
Ive never dealt with a p2k machine but is there a plug you can remove to disconect all the lights?  Then if it still blows the fuse you dont have to check each light socket?
unsure myself as there's 4 big plugs at one end of the pf and then some hanging off the driver pcb I have to look at the manual