zyxel p660r-d1 recap ? What cap's to buy ?

[cronogr]

Hi, guys i'm a new member here and i would like to try my first cap replacing on my old adsl modem/router, the modem is really unstable and i'm gonna try chaning the caps for better stability i'm good at soldering but my knowledge about caps is limited, so the mobo of the modem has 10 caps here is the list:

Jackson 3300uf 16v
Jackson 470uf 6.4v (x4)
Jackson 1uf 50v
..... 47uf 35v (x2)
hermei 1000uf 16v
Jackson 470uf 16v

So what brand capacitors should i order ? Should i orcer caps with higher capacity ? What do u suggest ?

Thanks

[PCBONEZ]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

Howdy!

Are you sure you don't mean Jackcon?

We need the name, size, -> and series <- to help you spec anything out for sure.

Jackcon series are usually 3 letters
Hermei series are usually 2 letters
.

[c_hegge]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

Hi and welcome to the badcaps.net forums.

First Question (What capacitors to use)
The series you use is just as important as the brand. It determines things such as the ESR (a small resistance the cap has to current) and how much ripple the cap can handle. For a modem router, panasonic FM series would probably be OK

Second Question:
Keep the capacitance the same. Changing it may interfere with the way the circuit works. The cap didn't fail from being underrated, but from being badly made.

[cronogr]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

i don't think that they have this info on them :P I will try to take some good quality pics and i will try to measure the caps ....

[PCBONEZ]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

Nah, it's probably on them just hard to see or they ran the series code into some other number [like temp rating] so it looks like one big number when it's two or three little ones.
.

[gonzo0815]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

Take panasonic FC or FM or any other decent low esr capacitor; that are basic buck regulators, they work with anything rated as low esr capacitor.

[cronogr]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

so i did this i took out some nichicon caps from a dfi mobo i solder them on the modem :P The modem runs faster no dc as for now 12+ hours Yeah i didn't notice at the beggining but the nichicon caps are 16v ... anyway the modem runs great i replaced 7 of the 10 caps and i'm pleased with the result
If i run caps with bigger farad rating it will be ok ?

edit : i will upload some pics in a while

[PCBONEZ]

Re: zyxel p660r-d1 recap ? What cap's to buy ?

Depending on what the circuit is more uF can screw up timings [sequencing between circuits] or shift frequencies out of range.
NOT a good thing on a communications device that has to connect and 'talk to' other communications devices.
You would have to draw out a schematic and do the math to know for sure.

More uF doesn't do much for performance anyway. [That's an old wive's tale.]
- Lower ESR does.
Those folks that used more uF and got better performance unknowingly lowered the ESR when they raised the uF.
The more uF wasn't what helped, it was the lower ESR that did the trick.

Used 16v caps are not 16v caps anymore.
Aluminum Electrolytic caps adjust to the applied [actual circuit] voltage within hours.
If you took them off a motherboard then those were probably 12v caps when you moved them.
If they didn't burn up in 12 hours then 12v caps was okay there.
.