Got from Chinaman.......

[Hansoon]

...... NO, not egg noodles but a set of thermistors for the BH-C-280/360 series.

I had to rebuild the fuser since it made over 600K. The original thermistors where covered with brown goo, so to make it perfect I also replaced the 4 thermistors with non-OEM from Chinaman.

Shortly after firing up the machine it gave me a C-3721 service code for overheating accompanied with a stench of overheated plastic.

After inspecting the fuser unit I found following:

ThermistorChina 20210123_163802.jpg
(The violet paint our company uses to mark NON-OEM parts.)

Since this is my own office machine and I did not want to invest in a new fuser unit, at the same time not having a replacement for the thermistors I compared the thermistors of the BH-C-280/360 series with those of the ancient BH-C-353 machines, from which I have many to scrap, and they have the same electrical specs of 1.6MOhm at room temperature. They are mechanically totally different but I managed to adapt them. Trusting that, keeping them from the surface a millimeter, like in the the original C-280/360 and not like in the C-353, where they are touching the surface of the fuser foil it would work and yes it did. (keeping for the coming hours fingers crossed and having the # of the fire squad at hand, I think its OK) Allright, it looks clunky but it works and didn't cost me a dime.....

20210123_151717.jpg

20210123_151653.jpg

Hans

[blackcat4866]

Re: Got from Chinaman.......

The clunky aspect doesn't bother me as long as it fits inside the fuser cover. Nice work!

I've been trying to figure out diagnosing some Toshiba thermistors. My latest method is to warm up the clothes iron set to "Cotton". I pressed the thermistor to the tip of the iron and read resistance across a low 150C to high range 180C (a clothes iron cycles off/on just like a fuser giving a standard range of values). So a good thermister reads from <7.3Ω @ 150C to <5.6Ω @ 180C. At least with Toshiba themistors I used to read room temperature ~400KΩ and finger temperature ~270KΩ, which is not predictive of whether your thermistor is good or not.

That's just disappointing that you Chinese thermistors clearly were never tested in a real fusing unit. =^..^=

[BillyCarpenter]

Re: Got from Chinaman.......

The clunky aspect doesn't bother me as long as it fits inside the fuser cover. Nice work!

I've been trying to figure out diagnosing some Toshiba thermistors. My latest method is to warm up the clothes iron set to "Cotton". I pressed the thermistor to the tip of the iron and read resistance across a low 150C to high range 180C (a clothes iron cycles off/on just like a fuser giving a standard range of values). So a good thermister reads from <7.3Ω @ 150C to <5.6Ω @ 180C. At least with Toshiba themistors I used to read room temperature ~400KΩ and finger temperature ~270KΩ, which is not predictive of whether your thermistor is good or not.

That's just disappointing that you Chinese thermistors clearly were never tested in a real fusing unit. =^..^=

I've done some crazy shit like that in the past to test a thermistor. I thought I was the only one. lol


I think I used a soldering iron.

[allan]

Re: Got from Chinaman.......

Good job on getting your office machine running with your mod.

On the 223/423 machines the 3de party NTC's works real well and does not scratch the upper like the original ones. But sure you know that. Wonder if they are in the same resistance range?

Those are chines...

[Hansoon]

Re: Got from Chinaman.......

Good job on getting your office machine running with your mod.

On the 223/423 machines the 3de party NTC's works real well and does not scratch the upper like the original ones. But sure you know that. Wonder if they are in the same resistance range?

Those are chines...

Yes Allan, They are exactly the same 1.6MOhm at room temperature. But in the BH363/423 series no need to replace them most of the time. I just cover them with Teflon tape and than they, together with our modified Teflon hot rollers, live both together for ages....

Hans

[Hansoon]

Re: Got from Chinaman.......

"The clunky aspect doesn't bother me as long as it fits inside the fuser cover."

[mascan42]

Re: Got from Chinaman.......

They made those thermistors while making peepee in your Coke.

[copier tech]

Re: Got from Chinaman.......

...... NO, not egg noodles but a set of thermistors for the BH-C-280/360 series.

I had to rebuild the fuser since it made over 600K. The original thermistors where covered with brown goo, so to make it perfect I also replaced the 4 thermistors with non-OEM from Chinaman.

Shortly after firing up the machine it gave me a C-3721 service code for overheating accompanied with a stench of overheated plastic.

After inspecting the fuser unit I found following:

[ATTACH=CONFIG]47996[/ATTACH]
(The violet paint our company uses to mark NON-OEM parts.)

Since this is my own office machine and I did not want to invest in a new fuser unit, at the same time not having a replacement for the thermistors I compared the thermistors of the BH-C-280/360 series with those of the ancient BH-C-353 machines, from which I have many to scrap, and they have the same electrical specs of 1.6MOhm at room temperature. They are mechanically totally different but I managed to adapt them. Trusting that, keeping them from the surface a millimeter, like in the the original C-280/360 and not like in the C-353, where they are touching the surface of the fuser foil it would work and yes it did. (keeping for the coming hours fingers crossed and having the # of the fire squad at hand, I think its OK) Allright, it looks clunky but it works and didn't cost me a dime.....

[ATTACH=CONFIG]47997[/ATTACH]

[ATTACH=CONFIG]47998[/ATTACH]

Hans

Wow this would be serious breach of health & safely here in the UK, you can smell burning on a fuser that has done 600k after replacing parts from an unknown source.

Don't EVER leave that machine on unattended

[Hansoon]

Re: Got from Chinaman.......

Wow this would be serious breach of health & safely here in the UK, you can smell burning on a fuser that has done 600k after replacing parts from an unknown source.

Don't EVER leave that machine on unattended

[copier tech]

Re: Got from Chinaman.......

The fact you stated the machine 'made a stench of overheated plastic' would ring alarm bells with me.

Konica Minolta didn't design these fusers to be rebuilt after 600k it owes you nothing, personally I would replace the fuser with a new one & get another 600k trouble free printing.

But I do understand some techs are working in poverty so have to do what they can.

[Hansoon]

Re: Got from Chinaman.......

The fact you stated the machine 'made a stench of overheated plastic' would ring alarm bells with me.

Yes but the stench came from those rotten Chinese AliBaba thermistors. I think they used a not heat-resistant kind of plastic. Probably the kind of plastic they use otherwise for their pisspots.....

Konica Minolta didn't design these fusers to be rebuilt after 600k it owes you nothing, personally I would replace the fuser with a new one & get another 600k trouble free printing.

Well, I replaced everything. The only thing left of those "fine KonicaMinolta designed fusers" was a frame, a few lamps and heat resistant wiring. Connectors where as new. Do not see how that could pose a danger.....

But I do understand some techs are working in poverty so have to do what they can.

Trying not to take that "poverty" too personal.

YES! I am an Indy and am proud of it that we Indies have to fight from time to time to keep up and are able to do. And I am proud of it that we are able to survive without constantly slamming new parts into machines. Good I am not a Green-Party member, otherwise I would find for sure some arguments about waste of resources and environment too......


Hoping not to sound arrogant, but rebuilding a fuser unit need a little more than only removing two screws and four connectors as with installing a factory new unit.

Hans

[BillyCarpenter]

Re: Got from Chinaman.......

Yes but the stench came from those rotten Chinese AliBaba thermistors. I think they used a not heat-resistant kind of plastic. Probably the kind of plastic they use otherwise for their pisspots.....



Well, I replaced everything. The only thing left of those "fine KonicaMinolta designed fusers" was a frame, a few lamps and heat resistant wiring. Connectors where as new. Do not see how that could pose a danger.....



Trying not to take that "poverty" to personal.

YES! I am an Indy and am proud of it that we Indies have to fight from time to time to keep up and are able to do. And I am proud of it that we are able to survive without constantly slamming new parts into machines. Good I am not a Green-Party member, otherwise I would find for sure some arguments about waste of resources and environment too......


Hoping not to sound arrogant, but rebuilding a fuser unit need a little more than only removing two screws and four connectors as with installing a factory new unit.

Hans

The more senior techs on here have probably rebuilt more fusers than they can count. I don't think you're gonna impress them with your ability to rebuild one. I think what copier tech is saying is that you're playing with fire - literally. You're using a thermistor that most likely hasn't passed any kind of safety tests and you're kinda playing Russian Roulette. If the copier were sitting in the middle of your home, that's one thing. But you're potentially putting your customer at risk. But it's your call. I wish you the best.

PS - Have you ever seen a fuser that has melted down? I have. It's quite a site to behold.

[Hansoon]

Re: Got from Chinaman.......

I don't think you're gonna impress them with your ability to rebuild one.

Well sorry you got that wrong. I never felt the need to impress one. It was not intended to "impress" one here but to help colleague Indies and share what experience I had with junk from AliBaba and warn them about it.

That was the one and sole purpose I had.

I didn't start the thread with "Guys look what I did and how bright I am"
My only and honest intention was to warn everybody here for certain Chinese suppliers.

English is not my mother tongue, perhaps things are perceived not the way I intended.
Since the reactions on my thread become more and more hostile, I will refrain from any further comment on this.

Very sorry to see that the once collegial attitude in this great site deteriorated that much...........

Hans

[BillyCarpenter]

Re: Got from Chinaman.......

Well sorry you got that wrong. I never felt the need to impress one. It was not intended to "impress" one here but to help colleague Indies and share what experience I had with junk from AliBaba and warn them about it.

That was the one and sole purpose I had.

I didn't start the thread with "Guys look what I did and how bright I am"
My only and honest intention was to warn everybody here for certain Chinese suppliers.

English is not my mother tongue, perhaps things are perceived not the way I intended.
Since the reactions on my thread become more and more hostile, I will refer from any further comment on this.

Very sorry to see that the once collegial attitude in this great site deteriorated that much...........

Hans

Hans,

I sincerely apologize if I misread what you said. This is the part I was referring to.

"Hoping not to sound arrogant, but rebuilding a fuser unit need a little more than only removing two screws and four connectors as with installing a factory new unit."


To me, it sounded a bit arrogant. But my apologies if that wasn't your intent. Cheers.

[allan]

Re: Got from Chinaman.......

Wow this would be serious breach of health & safely here in the UK, you can smell burning on a fuser that has done 600k after replacing parts from an unknown source.

Don't EVER leave that machine on unattended

There are multiple ways these machines can detect over and under temp. The only one relating to real robust safety would be the thermal fuses. Then if you install the wrong kind of NTC it would be the same as having a fuser issue and the machine will code out of pop the fuse. Try and set ABS-FR alight. Its his own office machine so can't see the issue for him to try and safe some money.

Its a real shame how much waste these machines can generate. Dev units, drum units, fusers, transfer belts, waste boxes, empty toner bottles, rollers and then eventually the machine itself will find itself to a landfill. Anything that can be rebuilt helps.