(Topic ID: 33905)

something about capacitors?

By Dawson

11 years ago


Topic Heartbeat

Topic Stats

  • 32 posts
  • 16 Pinsiders participating
  • Latest reply 11 years ago by Dawson
  • Topic is favorited by 1 Pinsider

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#1 11 years ago

well I just changed out all IC's on BOPs chase light assembly board a-14007 but I cant seem to find the correct capacitors .... I feel they have really specific values

100ufd, 25v (+50, -10%)

and a 1ufd 63v (+50, -10%)

must these replacement values be exact for thing to operate right or am I just SOL..

TJ

#2 11 years ago

I know you can go larger on the voltage. Physical space may be an issue if you go too large. Can't remember if you have to stay the same ufd or not.

#3 11 years ago

Pretty sure the farads can be reasonably higher too - even double or triple. But not certain.

#4 11 years ago

Try and the get the uF correct, voltage can be equal or higher. 100v rated cap is a good replacement for a 63v rated cap.

====

http://www.greatplainselectronics.com/Category-109.asp

Product ID: CEA-100uF-25V-VX
Capacitor, Axial Electroltyic, 100uF, 25V

Capacitor, 100uF, 25V, 85C, Axial Electrolytic
Manufacturer: Nichicon
Manufacturer Part Number: TVX1E101MAD

and

Product ID: CEA-1uF-100V-VX
Capacitor, Axial Electroltyic, 1uF, 100V

Capacitor, 1uF, 100V, 85C, Axial Electrolytic
Manufacturer: Nichicon
Manufacturer Part Number: TVX2A010MAD

#5 11 years ago

WOWO ,, loads of tech help! and fast at that ,
you guys rule , now to cross the fingers and hope that those work

TJ

#6 11 years ago

Well I found a 100uf 100 v at the rat shack but its radial and I need axial will the radial work if the legs reach?

#7 11 years ago

Yes

#8 11 years ago

Can always extend the legs with some wire too

#9 11 years ago

Thanks I will let you know the results

#10 11 years ago

Just remember for radial or axial capacitors if they are polarized you have to connect them in a certain way

#11 11 years ago

The bypass capacitors for ICs are .01 pfd 50v ceramic axials. They don't usually need to be replaced though.

#12 11 years ago

I agree with all the above, assuming these caps are doing power supply filtering. If they are in an RC circuit of some sort, controlling timing, then you should replace with the same uf rating.

Going higher in voltage is ok, as long as you don't go freakishly high. IIRC, if you replace a 10V with, say, a 10,000V, you would run into wierd leakage issues. But tech school was 30 years ago...

donjagra is right in that the little ceramic bypass caps seldom go bad. The electrolytics have a liquid in them that may leak out or dry up. That's usually why they fail.

And as pinballhelp says, watch your polarity! Get them in backwards, and they could actually explode.

HTH's

#13 11 years ago
Quoted from Dawson:

well I just changed out all IC's on BOPs chase light assembly board a-14007 but I cant seem to find the correct capacitors .... I feel they have really specific values
100ufd, 25v (+50, -10%)
and a 1ufd 63v (+50, -10%)
must these replacement values be exact for thing to operate right or am I just SOL..
TJ

What are you trying to accomplish?
Does the board not "chase"?
How did you "kill it" as you previously posted?
What kind of testing did you do before all this work?
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#14 11 years ago

Don't forget to match the temperature on those caps. If you go lower they probably wont hold up long.

#15 11 years ago

I only use 105 degree caps.

#16 11 years ago

did you have any luck dawson? i'm trying to find a 160v 150uf (micro fahrad) capacitors for my dm. kind of new to these specs myself.

#17 11 years ago
Quoted from Ballsofsteel:

did you have any luck dawson? i'm trying to find a 160v 150uf (micro fahrad) capacitors for my dm. kind of new to these specs myself.

Where does DM use that spec cap? Just curious.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#18 11 years ago
Quoted from Ballsofsteel:

did you have any luck dawson? i'm trying to find a 160v 150uf (micro fahrad) capacitors for my dm. kind of new to these specs myself.

http://www.mouser.com/

#19 11 years ago

Any idea, how can I check the capacitors with a DMM?

I've got mine on the board, and another one used one... Any idea?

#20 11 years ago
Quoted from Angyalpor:

Any idea, how can I check the capacitors with a DMM?

Your tester has to have that capability and you have to float at least one post off the board. If your tester can do it be sure to discharge the cap with a 1k resistor (hold it across the cap post) before testing.

#21 11 years ago

Electro caps can really only be correctly tested with an ESR meter (Equivalent Series Resistance). Any other test won't truly report the complete condition especially of smaller value electros - say 1~100 mfd

If you are suspicious enough to remove one leg to check, they are so cheap you may as well just replace it.

Using an ESR tester means you can test the cap in circuit (no need to desolder one leg) You can buy an ESR tester for about $100 or make one yourself here:

http://members.shaw.ca/swstuff/esrmeter.html

#22 11 years ago
Quoted from Homepin:

Using an ESR tester means you can test the cap in circuit (no need to desolder one leg)

I've seen youtube video's proving that wrong. The guys name is Pretcher I think....He tested a cap in circuit it tested in the good range, then floated a post and it tested bad.

He showed the meter both times and sure enough it read differently both times...

#23 11 years ago

Ooooo....

I hope, You will send a picture for me about the adjustment of the DMM, to test a capacitor good or not...

#24 11 years ago

chris;
Where does DM use that spec cap? Just curious.
for the dmd, there are 2 capacitors.

jrrdw;

thanks for the link!

#25 11 years ago

Chris, It all started when I sent all the boards to rob Anthony to try to find out why bride of pinbot won't sing ? He tested the boards and they were fine no problem .. So when I reinstalled the boards there are to wires with a molex plug that needed a home .. Like the knucklehead that I am I plugged it in and zap all the helmet lights lit up and the face went nuts so I turned her off ASAP .... Now no lights at all ... I was getting a light or two to come on randomly but those went out too.. So I decided to re chip the board .. Getting 13.75 volts at the molex pin but I think that's high as the board says +12v after replacing all the major components ,still no love so time to replace the caps right ?

#26 11 years ago
Quoted from Ballsofsteel:

chris;
Where does DM use that spec cap? Just curious.
for the dmd, there are 2 capacitors.

Aha...you can use the more commonly found 160V 220uf in place.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#27 11 years ago

Your caps are probably OK. They can take some short term abuse. You would probably see physical damage if they went bad.

Usually transistors and ICs take the abuse of an overvoltage accident.

Tom

#28 11 years ago

One of the caps looked ok one the 1uf was bulging on one end .. I replaced that one with a cap that went 25v instead of the 64v recommended! could that have messed anything else up, it's always something that's why I love this stuff

#29 11 years ago

Surely that could have messed something up, as you cannot go lower on voltage on a capacitor.
I would fix that immediately.

That said, as many hundreds of caps I've replaced on arcade boards and monitors, I've never replaced one on a pin. You can pick up an ESR meter fairly cheaply, but other than replacing the one you goofed up I would think this isn't the underlying problem.

#30 11 years ago

Ask LLoyd...he's got like a bazillion answers to these type issues.

#31 11 years ago

chris;
Aha...you can use the more commonly found 160V 220uf in place.

thanks a ton!!

#32 11 years ago

it was turned on only long enough to realize the helmet lights were not working ,

thanks

TJ

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