Sharp Fax UX-120 bad Nichicon PL

[davmax]

Yes the Sharp Fax is full of Nichicon. I took it apart because it was showing signs of a bad cap, ripple being printed on a fax sheet. After removing some caps with the intent to replace all I discovered one Nichicon 680u 10V PL on the output of the SMPS had leaked onto the PCB and corroded it's own leads inside the mounting holes. The leak was through the seal of one lead.

Well I know TC has found this series of cap to be reliable so it must be an odd imperfect.

It is being replaced by a Ruby ZL of the same value.

[davmax]

Re: Sharp Fax UX-120 bad Nichicon PL

Well I changed the blown Nichicon. It made no difference so changed all Nichicons and now works perfectly. AND horror of horrors I could only get 200uF 400V and 2200uF 35V in LELON!!!!. But it works. For how long we shall see.

Lelon are stocked in vast numbers by Altronics in Australia.

[cods69]

Re: Sharp Fax UX-120 bad Nichicon PL

Lelon are stocked in vast numbers by Altronics in Australia.

Hmm...I was wondering only a week ago what brand(s) Altronics supplied. Thanks.

[Krankshaft]

Re: Sharp Fax UX-120 bad Nichicon PL

Hey Davmax sorry to bring and old thread from the grave but I'm fixing my fathers old Sharp thermal fax and came across this thread.

It has been running for 15 years non-stop unfortunately it was shut down a year ago and I guess when the caps cooled down all hell broke loose.

The copies started turning out light with streaks (See Picture).

Is this the same problem you experienced?

I replaced all of the supply caps accept the line filter and some Nichicon PLs in odd values 56 uf and 82uf and a 330uf at 35 volts I don't have these in stock nor do I have the 2 560uf 35V jobs.

The brown caps are the ones I haven't replaced.

Before I order them I would like to know if your printouts were similar. Oddly enough it prints out the transaction report just fine but copies turn out this way.

[kikkoman]

Re: Sharp Fax UX-120 bad Nichicon PL

holy shit, that board is fried pretty badly. i can imagine that not only the caps are cooked.

[Krankshaft]

Re: Sharp Fax UX-120 bad Nichicon PL

Thats actually darkening of the hard paper PCB from years of heat. The PSU works just fine.

ESR values out of circuit. These are the suspect caps.

56uf 6.2 ohms
56 uf 1.0 ohms
82 uf 1.1 ohms
82 uf 2.3 ohms

The other caps are normal but I will replace them anyway.

These caps are Nichicon PLs would Panasonic FCs work in their place?

The datasheet says that the PLs are "ultra low ESR".

[davmax]

Re: Sharp Fax UX-120 bad Nichicon PL

Years of heat killed the caps no doubt. Well mine has been running 24/7 since I replaced all the caps (even with new Lelon). It is running very well.

Sorry I cannot remember the print output but it was certainly unusable with black steaking down the right side.