Holy Truckload Of Caps, Batman!

[CheffoJeffo]

I was looking for a quick project to keep myself busy while my Exidy 440 kit is in transit, so I decided to pull and cap the monitor from my JAMMA bartop (it's been doing a mild hula for quite a while now, but i've been too lazy to take it apart enough to pull the chassis.

I looked to Bob's Monitor ID page to find that, surprise, surprise, this chassis is listed as unidentified.



OK, so I grab my magnifier and make a list of all of the caps ... all 40! of them.

I don't think that I've ever worked on a monitor with that many electrolytics. And there are a bunch that I don't have in my stock (a mess of 315V 2.2u and 3.3u, as well as a bigass 200V 820u and 1000V .068Ku), so I'll be hitting DigiKey.com tonight, which puts things off for a couple of days.

I am no longer looking forward to capping this bastard, but I'll be damned if I am going to put it back without all new caps (they're pretty well baked -- chassis was mounted upside down on the top of the cabinet).

EDIT: To top it off, the solder side was completely (!!!) covered in flux -- sticky and, very, very, very dirty. It took me nearly an hour with rubbing alcohol and a toothbrush to get it close to clean. ugh!

[Jack Burton]

Nothing to add, but man I am still such a noob at this stuff....

I've learned so much in the last two years but I still haven't tackled a cap kit or full on monitor repair. 

[CheffoJeffo]

Ugh ... that stupid 820u cap ran me $15.

Add another $5 or so for the 315V caps, along with the stuff that I already had on hand and this is now the most expensive cap kit ever.

[lilshawn]

you can always go up in voltage...instead of 315 volt you could go 350 or 400v

dimensionally they would be very similar, but because they would be a more readily stocked part, they may and up being cheaper.

also depending on the function of your 820uf cap, for example, is likely being used as a power filter, you might have been able to go to a more standard value. not sure about the price, but again using the same idea, you may get it cheaper on stock that has a higher turnaround.

[Ken Layton]

I would have used 350 volt ones to replace any 315 volt ones.

[CheffoJeffo]

Next time I guess I'll order 350V -- I've just never stocked anything higher than 250V.

Yeah, the 820u is a filter and she's a five-lead pain in the ass -- there I did go to 400V and was happy to find one that matched the footprint and pinout.

[SirPeale]

I was repairing a Ducksan once from a Pin2000.  Found a back cap in the power supply circuit, 22uf @ 350V, IIRC.

Thought (hoped) that someone else had just stuck a way higher cap in there, so I took a chance and stuck a 250V cap in there since I had it on hand.  Nope.  Fired right up, and had a perfect picture....for about 30 seconds.  Then it popped its top.  Had to wait a few weeks for our cap guy to finally get them in (they were a specialty item, not normally stocked) and finally had to settle for two 10uf caps instead of 1 22uf.

I always like to shop around a little bit on price.  I prefer Xicon caps, but sometimes you have to go with what's there.

[lilshawn]

Yeah, the 820u is a filter and she's a five-lead pain in the ass

i would have (if known) just replaced them with several caps equal to the original specs.

i'm stupid like that 

[CheffoJeffo]

DAGNABBIT!

After all of the hassle, DigiKey sent the wrong 820u cap and I was missing a big 220u that I thought I had. Well, the 820 wasn't so bad, it just had the wrong number of leads, so I clipped the unused ones and managed to fit it in. I left the 220u in for the time being.

Still have some hula and the damned convergence is out.

 

Time to take a break from this beast for a while.

[MonMotha]

Did Digi-Key actually send you the wrong part, or did you order the wrong part?  If they sent the wrong one, call them up and let them know.  They'll ship you the right part for free, and they don't usually ask for the old one back.  If anything, this is helpful for others because it lets them know they may have a problem.  Their warehouse is HUGE, and sometimes things get misplaced.