Pantum P2502W Toner Reset Chip help

[DJ_MIX]

Need help just bought this cheap Laser printer.
They all now come with these chips to limit refilling.

Anyway I remove the chip but it has this black blob over the chip. I was hoping to remove the black stuff off to see what chips it uses to read the contents.

I tried heating it up with heat gun a bit and it does not melt at all, it's rock hard.

I have a EETools Topmax programmer, but without any info on what the 4 pins do, don't know if I will be able to read the chip information.

What I'm asking is has anyone have any ideas ho to tackle this.

attached pic of chip

[stj]

there is probably nothing but silicon under those blobs.

if you want to do this, start by working out what the contacts are.
find the ground, then find the supply voltage.
after that probe the remaining 2 to see what interface it is.
probably I²C

[DJ_MIX]

I guess I can find VCC, and GND from the printer itself??
from the pogo pins that touch the chip?

[stj]

exctly - maybe even follow the tracks back to the controller.

[DJ_MIX]

Ok great Thanks.
I uploaded I2C Pin out. Most likely will need to find SDA and SCL.

I should be able to this with my EETools topmax programmer. Never dealt with I2c chips, so all new to me

[DJ_MIX]

OK got some voltages and found Ground.
This weekend I will try to hook it up to my programmer and see what happens

[DJ_MIX]

I give up on this project. Without knowing what chip is on that board. it's very difficult to read contents with my eeprom reader.

[stj]

because you need a logic analyser.
like the saleae
(or better yet, a chinese ebay clone!)

[DJ_MIX]

with this logic analyser, what would I be able to see?
I dont see how it would help me figure out what chip is on that toner chip

This is all new to me so bare with me. Any links on this subject is helpful.

I assume the chip is on that tiny board or is it on the printer.

[DJ_MIX]

Added Pics of Printer Board. Can anyone identify what type of chip 423K3 is?
Only other chip I found on this board that may be helpful is the bios Chip MX 25L6406E.

Maybe the toner count is stored on this chip? Either way I plan to dump the chips contents. Maybe after the toner is empty I'm going to restore the dump back to chip and see if that sets the toner count back to original. If that works I will hard wire it with connector for future restores.

[khoalam]

Hi, I don't know if anyone still working on this toner chip, but I have some information to share. The protocol used for the toner chip is indeed I2C. I have confirm this with my oscilloscope. The printer will issue a Write request for Address 0x5b when the lid is closed.

[zdm900]

Any progress? Would love to help in any way possible!

[geekgirl1111]

What chip re-setter can I use for the Pantum chip?
Most are for epson..
Thanks!!

[wolvmarine]

I had just added toner to the cartridge and now its saying its low 4%. Looks like I tripped something when I opened it. Has anyone gotten any further on this project?

If not is there a good cheap laser jet that can be refilled properly?

[omahamike]

Originally Posted by wolvmarine

I had just added toner to the cartridge and now its saying its low 4%. Looks like I tripped something when I opened it. Has anyone gotten any further on this project?

If not is there a good cheap laser jet that can be refilled properly?

I found a solution for a Samsung 2955 printer...they're selling for $60 on eBay with free shipping. Is that cheap enuf for you? Contact me via private e-mail for my solution. I love the printer because it prints the back without putting the paper back in and doing it separately.

[Dreiseratops]

Its cheap enough but we want to not throw out the printers that we got duped into buying.

I kind of thought that particular samsung printer was too similar not to be the same thing...
Does the cartridge fit in the pantum??

Can you post pics of the cartridge? Particularly the chip and the ends with the fit posts...

Im already researching a re-fillable color lazer to replace this with.
Couple hundo and youre set for life if you get the right model BrotherPrinter.

[geekgirl1111]

I'm at the same place. Says 4% and expected pages 671 actual pages printed 350. I just put new toner from Amazon in. I saw someone said to leave it off for a few days. So it's off right now. I'm looking at the original pics of the chip and trying to figure it out from the visible parts of the circuit board. VCC is plainly labeled. 1v??
I read that it reads the density of the toner for the %. Hummm...
A review said that when it's down to 0 it will stop printing, so I'm not going to try printing until think Of something. Didn't look at the control board pics yet, or open the thing. I'm going to use wire shark to see whats being sent.
Page count has to be a simple adder.
From youtube, It seems that all this info is on the chip.
Have to go back to my books to see how to reset an adder, or if anyone current in this stuff can post about adders if it's relevant.
I don't have a logic analyzer just a chip test board.
I was doing a search on "Bichon" chips but nada.
I'm might use wire shark to see whats being sent over. Probably no useful info.
There are chips available. One place has them. I didn't see the price.
Any body know how to build chip resetters if we figure out the chip?

[tuskiomi]

I'm going to hook up an I2C Sniffer some time today, and see just exactly what the printer is trying to do when it prints.

[geekgirl1111]

I did a capture with wire shark while on wifi, but didn't have a chance to look at it.
Found an Arduino clone on sale for $10 and that they had a basic Ras Pi board for $5.
Got both and a few library books. Gonna try a hex dump. This weekend...
Has to be a way to just reset a simple adder or shift register.
And make the "allowed #of pages" increase to its max..
Now... how is the toner # generated??

[tuskiomi]

the pinout of the chip is as follows:
(corner notch)
VCC (+3.3V logic)
SCL
SDA
GND

Here is an I2C device scan dump:

I2C device found at address 0x06 !
I2C device found at address 0x07 !
I2C device found at address 0x0E !
I2C device found at address 0x0F !
I2C device found at address 0x16 !
I2C device found at address 0x17 !
I2C device found at address 0x1E !
I2C device found at address 0x1F !
I2C device found at address 0x26 !
I2C device found at address 0x27 !
I2C device found at address 0x2E !
I2C device found at address 0x2F !
I2C device found at address 0x36 !
I2C device found at address 0x37 !
I2C device found at address 0x3E !
I2C device found at address 0x3F !
I2C device found at address 0x46 !
I2C device found at address 0x47 !
I2C device found at address 0x4E !
I2C device found at address 0x4F !
I2C device found at address 0x56 !
I2C device found at address 0x57 !
I2C device found at address 0x58 !
I2C device found at address 0x59 !
I2C device found at address 0x5A !
I2C device found at address 0x5B ! (Mentioned by khoalam
I2C device found at address 0x5C !
I2C device found at address 0x5D !
I2C device found at address 0x5E !
I2C device found at address 0x5F !
I2C device found at address 0x66 !
I2C device found at address 0x67 !
I2C device found at address 0x6E !
I2C device found at address 0x6F !
I2C device found at address 0x76 !
I2C device found at address 0x77 !
I2C device found at address 0x7E !