Please teach me how to find datasheets to obsolete caps

[CdDvdFlash]

I've got a Toei arcade CRT chassis and printed on the PCB is CM-R14 but it might be a CM-R20 and so far needs two caps replaced, I've looked on the Nippon Chemi-Con site and got their 2020 catalogue I cant find any info about the first cap in the catalogue or on their obsolete catalogue, on the cap is:

(Radial electrolytic cap) Nippon Chemi-Con 1uF 160v 85c 8mm diameter, roughly 15mm long (cap is bulging at the legs) with 6mm PCB hole spacing, the chassis service manual says this cap C58 is a CE04W with "04" in a smaller font than the capital "CEW" so it must be a zero not the letter O, can someone please teach me how to find the datasheets for old capacitors as I have only found two bad caps but I am going to remove and test all of them with an ESR meter and multimeter, normally I type the brand and value and any other series letters/numbers into google with "datasheet" and sometimes I'm lucky but that's all I know, I need to know how to do a better search or which sites to go to suited for cap finding instead of asking about caps with a mile long list. I need the datasheets so I can match the ESR and or ripple current etc and I know I can use a slightly bigger or smaller cap can if good quality and the same for a larger voltage/temperature is ok but not lower voltage/temperature. I would be grateful for this so that I've learnt how and I would be saving peoples cap searching time unless I find a real difficult cap I would return here. Thank you all.

[CdDvdFlash]

Re: Please teach me how to find datasheets to obsolete caps

I would still like to know the info from my first post and I was searching for cap repair kits and found only one so far for a complete cap replacement, has anyone bought from this site before and would they be really old caps with a bad shelf life or does the guys there sell good caps they say the caps are all 100% Nichicon

https://www.arcadepartsandrepair.com...105c-nichicon/

[stj]

Re: Please teach me how to find datasheets to obsolete caps

i have repaired those,
just look at caps from rubycon and panasonic for high voltage caps

[CdDvdFlash]

Re: Please teach me how to find datasheets to obsolete caps

i have repaired those,
just look at caps from rubycon and panasonic for high voltage caps

Should they be low ESR and if so how low is low I don't have a lot of experience in this, if for example there is a 160v cap would 200v be good or go even higher

[stj]

Re: Please teach me how to find datasheets to obsolete caps

they dont really need to be low esr for a monitor, the highest frequency in them is 15KHz
105' temp rating is good though.

for 160v caps, if you can fit 200 or 250v it will be better.
the hardest part with old monitors is if you find a bipolar cap in it (BP)
those are hard to get now - ideally you replace it with a film cap but those are bigger

[momaka]

Re: Please teach me how to find datasheets to obsolete caps

General rule of thumb: if it's an 85C-rated cap, it's "general purpose" type... meaning NOT low ESR / low impedance... so you can safely replace it with about any 85C-rated or 105C-rated moderns caps. Just stick to the known good Japanese manufacturers to get a good service life out of the device (i.e. Rubycon, Nichicon, Panasonic, and United Chemicon.)

In most cases, you can even use "entry-level" low ESR / low impedance caps to replace such old 85C-rated GP caps and it won't be an issue.

stj is right about bipolar (BP) caps - those can be hard to find now, especially with a larger voltage and capacitance rating. Old CRT boards almost always had one or two in them. Just pay attention if it's a large cap (i.e. rated over 10 uF and over 100V.) Sometimes, those are rated to take really high ripple current. Replacing it with a polypropylene (PP) film cap of the same voltage rating might be a "NO GO" situation, as the PP cap might be rated for substantially lower ripple current. So for these large BP electrolytic caps, up the voltage rating to 2x if using PP film caps... and yes, the PP caps could end up being huge in comparison.

[Topcat]

Re: Please teach me how to find datasheets to obsolete caps

If you ever need a BP and can't find one, you can make your own in a crude way.

Say you need 220uF BP / NP. Take 2x 470uF polar, tie the two negative leads together and then use the positive leads of each cap in the circuit. Capacitance is reduced by half the cap rating in this config (2x 470uF / 2 = 230uF; within the tolerance of 220uF), voltage rating remains the same, so select the voltage according to what you need. It also no longer cares about polarity. I've used this a time or two back in the old world TV repair days.

[stj]

Re: Please teach me how to find datasheets to obsolete caps

for people that dont know,
that TOEI chassis is probably running since 1979!!!
the old caps did well.

that said - i recomend replacing the chip socket for the deflection i.c. with a turned-pin/machined-pin type instead of the old bakelite crap

[momaka]

Re: Please teach me how to find datasheets to obsolete caps

If you ever need a BP and can't find one, you can make your own in a crude way.
...
tie the two negative leads together and then use the positive leads of each cap in the circuit.

Yup, that should work too. I've seen this done in some subwoofer amp boards too. So even manufacturers do it.

I've also seen the same method used with two additional diodes - one across each cap, with cathode tied to (+) and anode tied to (-) of each cap. I presume this is to limit the reverse voltage to no more than 0.7V on each cap and thus allow for higher RC through this "bipolar" configuration.

that said - i recomend replacing the chip socket for the deflection i.c. with a turned-pin/machined-pin type instead of the old bakelite crap

+1

Machined sockets are a lot more pricey, but well worth the money. I've seen many failed devices due to failed sockets, especially if the device was in a harsh weather environment. The contacts of regular IC sockets oxidize / tarnish quite quickly with air moisture and cause problems. Machined sockets are more durable and provide a better electrical connection.