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One day Keith was asking me about the big, white, 15-ohm resistors
in the Bingos and if there are replacements`
I don’t know of any
direct-replacement (one with the same dimensions from the same vendor –
etc) but it really doesn’t matter,
when it comes to resistors “power-rating” is the main thing
you need to worry about.
These nannies are “3 Watt” parts and that is where the action
is, a resistor is sized to be able to handle the total power it sees, to be
able
to handle the heat that gets developed across it, so it
doesn’t burn out and/or catch or fire – etc. The “power rating” needs to
match or
preferably exceed how much power it needs to deal with.
Everything is I2R power, these are power-resistors`
Basically you need a 3-Watt 15-Ohm replacement!!
Keith and I shared a couple of emails on this and they are
poignant:
Keith
Nickalo
Aug 20, 2012
Thx Danny.
Bally bought those white rectangular resistors for the games. I don't
know what they are made of but once the get really old the white stuff
pretty much turns to chalk.
The resistor simply crumbles away around the
wire. I've had this happen several times myself but I have so many
parts machines I can usually just simply find a good
one. I remember one time last summer I
went out in the shop in the middle of the night to get one. It was
really hot and I was sweating my bag off out there. I got a
head out that had one in it. It looked
good so I cut it out and took it inside. Went to solder it in and the
damn thing disintegrated on me. Had to go back out
and get another. I'll probably order some
of those in myself to have on hand.
Talk to you later
Keith
Danny Leach <bingopinballs@> wrote:
Just so you know, the resisters you picked out will likely work, I
was asking though, because a 3-Watt resister if fairly tough and likely
burned out due to another problem - Likely it is an effect not the cause _
Likely something else drew/pulled excess current and those parts fried _ So
if he replaces them and still has problems and you can get his exact
machine and the exact location of those parts _ I can probably guess what
the real problem is,
If the body is crumbled and/or already fallen apart, the resister
will eventually fail altogether and no longer prefprm the critical
Function they are supposed to. Normally you see these
resistors across the coils and they function to dissipate the
reverse-energy
as the coil function to switch the relay or whatever module it
is controlling.
A lot of energy you don’t want surging back into the Bingo,
something will get hurt`
Please know that “if the bingo is burning resistors out in
this same location over and over again” then likely the resistor
is not the problem. It would be more likely for something to
be shorted, and pulling way too much current through the part…
So also use your eyes to inspect everything in that area,
something else is also broken`
These guys are in a lot of Bingos in a lot of places`
…and the same rules apply`
~
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