Toshiba fuser parts

[blackcat4866]

Re: Intermittent thermistors

Here's something else we see. When rebuilding the fusers, I always check the continuity of the thermistors. While my meter is
checking them (on the wire harness plug...blue wires = center thermistor, black wires = outside thermistor), I put my thumb &
forefinger on them to ensure the resistance changes. I'll then flick the thermistors & about 1/4 of the time, they are intermittent.
The metal inside is super tiny & breaks.

[ATTACH=CONFIG]50980[/ATTACH][ATTACH=CONFIG]50981[/ATTACH]

Good catch! That's not so easy to see. I've noticed this same issue on the 4555C, 4505AC and 4515AC holders also. I just touch the thermistor while metering, and it opens momentarily. When you release it, it re-connects. =^..^=

[Rusty.Harris]

Re: Intermittent thermistors

Good catch! That's not so easy to see. I've noticed this same issue on the 4555C, 4505AC and 4515AC holders also. I just touch the thermistor while metering, and it opens momentarily. When you release it, it re-connects. =^..^=

I guess I'm "old school" When something happens once, it's weird or just a fluke. If it happens TWICE, it's a trend.
And my curiosity wants to know why it failed.
Problem is, ATSG/TABS never wants to fix it.
I think part of the problem with Toshiba, isn't so much "them" but the Japanese philosophy, or just the way they are of not
making a mistake, as it means admitting failure. Not knocking them, but, it's just how they are.

On a side not, reference to TSB-2078, has anyone received the new belt holder and pins?

[Logged-on]

Re: Fuser core

I love how the "bosses" of Toshiba think. The outer shell of the fuser core (marked in red) is NOT available as a
part. When I inquired, I was told that the outer shell is "too fragile" to be made available. Ok, then if it is so
fragile, why are the other parts made available? To get to the thermistors or thermal fuse, you have to take that
shell off. Oh, wouldn't surprise me they don't make anything in that core available, forcing you to spend $$$ for
something you don't really need.

Since using the Shin-Etsu oil, doubling the amount Toshiba says to use, we aren't having as many fuser failures,
due to the oil drying up (along with cutting the fuser temperature).

Understanding how the whole IH coil system works, the magnetic lines of flux, creating the eddie currents along
the entire area, I would think scratches to the surface of the outer shell, could potentially create a "hot spot"
similar to how a piece of fuzz would create a hot spot, on a corona wire. And, of course they tell you not to
scratch/scrub the outer shell of the core, for fear of bending/mishaping the core. So, the only course you have
is to replace an expensive core, or odrering a new fuser from TABS or a repaired one from Hytec. And that's almost
impossible with "supply chain" issues.

I almost posted this in the rant section...

[ATTACH=CONFIG]50925[/ATTACH]

I just got out of class, they said the reason the shell isn't available as a single part is because of it's magnetic properties. it makes the shell so expensive, that to order it as a single part, you might as well just order the core.

[Rusty.Harris]

Re: Fuser core

I just got out of class, they said the reason the shell isn't available as a single part is because of it's magnetic properties. it makes the shell so expensive, that to order it as a single part, you might as well just order the core.

Yeah, that's the same thing I got. Said it was around 90% of the cost of the core.
Some that we've had to trash, I see why. Before using the Shin-Etsu oil, some would come back all ripped up and you can
see the "silver" coating worn down on the shell. It appears to be mostly made of copper.

[Rusty.Harris]

reference TSB-2078

As we all know, for the most part, getting a replacement fuser belt holder is like trying to squeeze blood out of a turnip.

But, the new pins & springs are (or were until I ordered them LOL) in stock.

IF, they work out, this might tamp down on the C471/72 issues! The new springs put a LOT of spring in the belt holder.
And, the pins have a much larger diameter, which hopefully means the spacing between the fuser & the IH coil will be
a bit more stable resulting in a more even temperature control.
Personally, I wish they would redesign the fuser and go back to the external thermistors & fuses, but we know if they
do that, it will be when a NEW machine is released.

[Bardcat]

Re: Toshiba fuser parts

From what I gather here, it's cheaper to order the entire belt holder unit because the Shell (the only part that we can see in the diagram that is NOT AVAILABLE TO ORDER) is almost as expensive just because of its magnetic properties? HOW much magnetic stuff is IN this thing? You can bend it so easily! I've given up trying to rationalize why Toshiba does what they do with parts and what can or can't be ordered. I've rebuilt so many of these damn fusers, it's a monthly chore that I'm just doing until the NEXT design comes out. I'm hopeful that the springs and the studs along with firmware 1600 actually does something. I'm amazed that they can make these fusers with such a flimsy feeling belt, thermistors, and thermostat to actually work. Looking back at the 857 fusers the only thing that needed replacing on a somewhat consistent basis was the THICK METAL hot roller, and that was just because the thing got scored. I rarely had to replace thermostats or even the pressure roller. I don't know why the fuser belt came into fashion as it's way WAY more delicate than the beefy and heavy old timey fusers.

[Logged-on]

Re: Toshiba fuser parts

Spring break for the schools here, I've replaced about 15 belt holders to this point, none have come back. I am imagining about 400k on my first replacement.

I wouild like to suggest that you order some of the new style studs, because if you replaced the holder before the bulletin came out, it is likely the new style holder with the old style studs.

[Rusty.Harris]

Re: Toshiba fuser parts

From what I gather here, it's cheaper to order the entire belt holder unit because the Shell (the only part that we can see in the diagram that is NOT AVAILABLE TO ORDER) is almost as expensive just because of its magnetic properties? HOW much magnetic stuff is IN this thing? You can bend it so easily! I've given up trying to rationalize why Toshiba does what they do with parts and what can or can't be ordered. I've rebuilt so many of these damn fusers, it's a monthly chore that I'm just doing until the NEXT design comes out. I'm hopeful that the springs and the studs along with firmware 1600 actually does something. I'm amazed that they can make these fusers with such a flimsy feeling belt, thermistors, and thermostat to actually work. Looking back at the 857 fusers the only thing that needed replacing on a somewhat consistent basis was the THICK METAL hot roller, and that was just because the thing got scored. I rarely had to replace thermostats or even the pressure roller. I don't know why the fuser belt came into fashion as it's way WAY more delicate than the beefy and heavy old timey fusers.

1600 seemed to tamp down some of our issues, but the biggest fix, was the addition of the new style springs in the belt holder, along with the new pins.
Even in some of the rebuilt belt holders, they are holding up WAY longer than just rebuilding the belt holder with a new thermostat and or thermistors.
I've had REAL GOOD luck setting the 85xx b&w, and the 75xx color machines fuser temperatures, to the level of the 55cpm speed. Heck, 99% of our
customers that have the higher speed machines, never come close to the monthly or daily volume anyway.
We've never had a complaint of toner rubbing off or low temperature codes due to cranking down the temperatures.

08-2010-0 =13
08-2010-2 =13
08-2020-10 =11
08-2386 =2 (cooling fan speed)