Timing on the paper feed assembly (Konica 7145 copier)

[copytechman]

Sounds like a bad/dirty corona wire and the above posters are correct, no screws need to be undone to remove the corona unit... take off the white clip on the cleaner rod, slide it out the front of the drum unit (Out through the spring you describe (sounds like the one I mentioned)) remove spring (if equipped), then push on the small metal tab on the back of the corona casing, its a holder spring/clip that holds the rear of the corona unit in place, lift the rear out first sliding away and up out of the drum unit... then u can turn it over and remove the grid (2 small springs) and clean or (preferably) replace the corona wires.... also not for the faint of heart... I would concur with pepper, it's probably time to call in a tech..

Best Regards!
A.

[eurosears]

Well I got most of the lines out, I have now only one vertical line (toner collects on the drum before it spins in the area closest to the corona assembly). It almost disappeared when I ran like 200 copies. Usually on the 3rd consequtive copy it is almost invisible. However, if the copying stops for like a minute and I make a copy it is visible again.

However, now I have error 26-4 when the message "auto supply toner came on". I see that the toner bottle and the sleeve in the back are not turning. The machine runs for like 3-4 minutes before it gives me this error. I hear a slight noise in the back like dup, dup, dup,.... Any suggestions?

[eurosears]

UPDATE: Removed the CB and then the toner supply assembly. Cleaned it outside and inside (so took out most of the toner), cleaned the solenoid, checked the gears and cleaned a few of them too, put everything back together. Turned the copier on. Turned on fine. Did 5 copies of the same page and the auto toner cycle began, this time the toner cartridge was spinning (that's probably because I got almost all the toner out of the toner supply assembly. It worked for 3 minutes and gave me the 26-4 error again
What do you guys think I should do next? Please help.

[copytechman]

Jeeez. This is a bundle o' fun! Well i'd certainly check the toner supply unit via 47 mode, (if you have the book) use 47 mode to check the assy, there's multiple codes the check for bottle rotation, auger drive and solenoid operation.. as well as a code to run the complete unit.. I don't have the book handy @ the moment tho, but if u look, it's in there.. also service mode (in the same are as the l-detect function) is a toner supply function, thats a good test as well, u can start/stop it and watch the unit from the front of the machine with the inside cover and inside metal cover removed.
I'd check the unit manually first, pull it, turn the 2 motor drives, does everything work inside? as well as operate the solenoid.. does it work? etc etc

Regards!
A.

[eurosears]

I don't have the codes but I checked it manually and it all worked (cleaned all the wheels, made sure they can spin, cleaned the solenoid, etc., vacuumed out most of the toner).
Once I put it all together and the auto toner supply began the bottle was spinning, I heard the solenoid engage at least once. Once the procedure stopped got the error code again. So I decided to check if toner makes it to the dropping point in the toner supply assembly. I took and the developing unit and inserted it back. Then took it out again and checked if toner made it into the developer. It did, quiet a bit actually. So I mixed the toner and developer manually shifting the developing unit back and forward. Then I inserted it back and did the same thing without making any copies. This time less toner feel into the developer which I expected since the copier was not engaged. I turned the copier off and on and did the procedure once more. This time similar amount of toner feel into the developer when I took it out and put it back in as initially (quiet a bit of toner again). This suggests to me that the second engine on the toner supply unit also works and drives the spiral that transports the toner to the drop off point (especially since I did vacuum the area initially).

Do you think it may have something to do with the fact that I did the L detect twice after I fixed the error 26-3?
What else can I check? Should I do another L detect (I don't care, will change that developer anyway)?
Notice that the L detect value is now at something like 86 (which is way off the 60-65 that it should be at).

The fact that I did replaced the developer the first time and the toner was mixed with it and I was able to print like 500 copies before the auto toner supply came on tells me that there is absolutely no problem with the mechanical part of the toner delivery system.
BTW, I got the new TDS sensor so I will install it later today.

[copytechman]

At this point if you've checked it out mechanically, then it may be the sensor on the toner supply unit (the piezo sensor) It's the only small square sensor on the supply unit, has 3 wires and is almost lower center of the rear of the unit, held on by 2 screws, much like the one that holds the tds sensor in place .. Should be cleaned (very gently, it's pressure sensitive). Especially since the l-detect completed successfully... either that or it's not plugged in... hard to say... it may be time to call in a tech as was stated previously.

Regards!
A.

[eurosears]

Yes, I have seen that sensor. It was plugged in. I will clean it today. How should I clean it? Can I use alcohol?

[copytechman]

Alcohol should be ok, just be very careful with it.. its very sensitive and likely very easy to damage...

Regards and good luck!
A.

[eurosears]

How can you damage it? WHat I should do not to damage it? How to clean it?

[copytechman]

Be very gentle with it... It's pressure sensitive... assuming it's ok... clean surface with cloth with alcohol... gently...

Regards.
A.

[eurosears]

Ok, I did the following:
1. Cleaned the "Piezo" sensor on the Auto Toner Supply System. The sensor was fully covered with toner. I used cotton swabs to clean the sensor extremely gently, at the end using minimal
amount of alcohol on them to finish the job. Also I marked gears for both engines that are connected to the Toner Supply Unit to make sure that these engines operate properly.
2. Turned on the copier and let it do the Auto Toner Supply thing after I made a few copies
3. After 3 minutes it gave me the 26-1 error.
4. So I replaced (finally) the old/damaged TDS sensor on the Developing Unit with a new one
5. Turn on the machine, did a few copies and I let it do the Auto Toner Supply thing again
6. After 3 minutes it gave me the 26-4 error again. I checked the position of the gears on the toner supply unit and they all moved since I marked them.

So, what is the problem? Could it be the fact that I ran the L detect twice already
(after I fixed the 0006 problem) and the Value is now at 89 (it should be somewhere between 60 and 65 at best). Basically the developer/toner mixture may be throwing it all off.
What do you think>?

[pepper38_cnd]

Yes when you change the sensor you have to do a dev change and run L Detect before the machine has made any copies with the new dev.

[copytechman]

Am I mistaken? Had you run l-detect with the new tds sensor and new dev yet or not? Because like pepper said, it makes a difference!
Regards!
A.

[eurosears]

No, I have not yet run the l detect with the new developer and sensor. It was all done with the old developer/toner mixture.
Ok, so before I add the developer:
I know I need to clean the developer unit very well (remove the TDS sensor prior).
Now, do I need to clean the Toner SUpply System since if I insert the developer unit with the new developer into the copier some toner will fall into it before doing the L detect from the toner supply unit if I don't clean it. Is there anything else I need to clean?
Once I run the L-detect can I just turn the copier off and then back on?

[copytechman]

Of all of my machines in the field, I have yet to remove the toner supply unit and clean it (much less the toner bottle) when doing the l-detect.... I generally clean out the dev unit thoroughly, load the new dev, then run l-detect. Thats about it... (not withstanding if the machine requires other service) I don't usually reboot the machine either unless I have to... I typically power off (rear switch), clean/replace dev, power up in 36 mode, run l-detect, power off and then power on normally.. (again if the machine needed other service I'd do that too) .. I don't ever run l-detect on OLD dev because it never works reliably.. tds sensor not withstanding..
Oh yes, also reset the dev counter in 25 mode > parts counter.

Regards!
A.