Ricoh mp7502 Temperature drops

[liontech]

Hi guysI have a strange problem with ricoh mp7502When printing a job, the temperature drops a lot, starts at normal temperature (190) and falls to 160 !.It does not throw sc code in the screen, but in history it appears sc991.I changed everything, fuser rollers, lamps, drum, developer, boards, I use original and generic toner and the temperature drops tooObviously, it does not blow the toner.any ideas?

[ruben]

Re: Ricoh mp7502 Temperature drops

SC991 is generic software error. Most of the time it can be cured by updating the firmware, however, sometimes it is a fault in the BCU or RAM.
If you check the values of SP7-403 it should tell you a bit more about the code, Ricoh will need this information if you contact them.

Does the SC appear at the same time that the temp drops? Does it drop immediately or during printing?

[liontech]

Re: Ricoh mp7502 Temperature drops

SC991 is generic software error. Most of the time it can be cured by updating the firmware, however, sometimes it is a fault in the BCU or RAM.
If you check the values of SP7-403 it should tell you a bit more about the code, Ricoh will need this information if you contact them.

Does the SC appear at the same time that the temp drops? Does it drop immediately or during printing?

Thanks for the replyThe code appears when the temperature drops.From the fifth copy begins to decrease the temperature

[Batman1976]

Re: Ricoh mp7502 Temperature drops

Hi,

Just a thought............ There was a similar fault related to temperture issues on the previous models (MP6002). The bracket of the thermistor was modifyed within the fuser unit. Might be worth a quick check of the thermistors and the position of the securing bracket. Also an SP mode was changed

Set Sp 1105-002 (Fuser temperture adjustment normal time) to 180 sec (defualt 190)

Also check following sp's are all at defualt

1105-001
1105-003~14
1107-001~24

hope that helps

[Mark Bbb]

Re: Ricoh mp7502 Temperature drops

Are you sure this temperature drop is abnormal?
Have you checked with another mp7502?
Like Ruben said, sc991 doesn't have to relate to this issue.
If it was a fuser issue, would it than not provoke sc5** fuser error codes?

[liontech]

Re: Ricoh mp7502 Temperature drops

Hi,

Just a thought............ There was a similar fault related to temperture issues on the previous models (MP6002). The bracket of the thermistor was modifyed within the fuser unit. Might be worth a quick check of the thermistors and the position of the securing bracket. Also an SP mode was changed

Set Sp 1105-002 (Fuser temperture adjustment normal time) to 180 sec (defualt 190)

Also check following sp's are all at defualt

1105-001
1105-003~14
1107-001~24

hope that helps

Yes, the bracket is correct, I checked a bulletin that talked about that and the temperatures are well configured.Thank you very much for the reply

[liontech]

Re: Ricoh mp7502 Temperature drops

Are you sure this temperature drop is abnormal?
Have you checked with another mp7502?
Like Ruben said, sc991 doesn't have to relate to this issue.
If it was a fuser issue, would it than not provoke sc5** fuser error codes?

I think so. I did tests on similar machines and the temperature drops from 190 to 184, 185.The machine is installed at 2000m above sea level, but I do not think that influences because there are many machines in that place and they do not present flaws.thanks for your help

[Cipher]

Re: Ricoh mp7502 Temperature drops

• Test the fusing lamps with a multi-meter and check they are all working.
• Clean / replace the thermistors.

The hot roller is only a thin teflon coated roller, so the paper as it passes though at 75ppm will remove some of that heat.

[Mark Bbb]

Re: Ricoh mp7502 Temperature drops

if there is no toner on your finger when rubbing over the paper, I don't think there is a problem.
You must know that - due to environment issues - fusing of toner is much more efficient than on earlier models.
(and I think that is good.)

[Mark Bbb]

Re: Ricoh mp7502 Temperature drops

• Test the fusing lamps with a multi-meter and check they are all working.
• Clean / replace the thermistors.

The hot roller is only a thin teflon coated roller, so the paper as it passes though at 75ppm will remove some of that heat.

it could be that one (of the 2) is not working..., precisely

[Batman1976]

Re: Ricoh mp7502 Temperature drops

Yes, the bracket is correct, I checked a bulletin that talked about that and the temperatures are well configured.Thank you very much for the reply

Have you fitted the new type Cleaning Webb to stop the build up of paper dust?

[kannuki2]

Re: Ricoh mp7502 Temperature drops

I wonder if someone was playing with the Sp mode. Perhaps changed to 150

[liontech]

Re: Ricoh mp7502 Temperature drops

if there is no toner on your finger when rubbing over the paper, I don't think there is a problem.
You must know that - due to environment issues - fusing of toner is much more efficient than on earlier models.
(and I think that is good.)

Guys, the problem was low input voltage, I had to buy voltage stabilizer.Thank you very much for your comments.
Sorry for the delay in responding.