Mp 7502 sc 320-01/ sc 380-21

[nodle]

Need some help. We have a MP 7502 that was installed in March it only has a meter of 67K.
When copying, receiving faxes, or printing, after the last page exits the machine, six seconds later it displays a SC320-01. The code can be reset, then I am able to run a SMC report.
The service code history records a SC320-01 and A SC380-21 simultaneously.
SC320-01 = Development output abnormal- The high voltage applied to the development unit is detected 10 times higher than the upper limit (45%) of PWM. - Development bias leak due to poor connection. Possible cause = Development power pack defective, or defective connector
SC380-21


If I go to the Copy Window from SP mode I can make as many copies as I want with no problems, but as soon as I return to normal operation I can make as many pages as I want but as stated before 6 seconds after the last page it will code out.
I have an identical machine 10 feet away, and have also made an observation that on my problem machine when the last page exits it will display a ready status for 1 second and then go to a please wait prior to the code. The properly operating machine never goes to a please wait, it just returns to Ready.

The original tech replaced the Development Power Pack twice with no change in the status.
I then was called in to assist. The first thing I did was update all the firmware. I then started swapping units with the known good machine to see if the problem would change or move to the other machine. I tried the development unit, Then the PCU, and then Charge corona, and lastly all the units together. there was no change in my machine or the good machine.
I called Tech support. They had me remove the development unit and then run output check on Development Bias, I did not get nay failure. I then reinstalled the development unit, and then ran a forced process control it instantly gave me a sc 320-01. They had me order the BCU, I returned the following day and installed the BCU there was no change. Working further with tech support I cheated the door and took voltage readings from the front frame of the dev. unit. when the page is passing through the voltage will go up to approx 520 VDC, then briefly drop to zero, and then seconds later jump back to 520 VDC, and code again. The zero reading coincides with the ready state on the op panel and then the return to 520VDC coincides with the Please wait. The same process on the good machine has the voltage drop to zero and remain at zero after the page exits the machine.
Tech support then had me order the EEPROM because it appeared that there is a logic signal causing the machine to apply the 520VDC at the end of the cycle. I returned with the EEPROM today. Unfortunately that did not change my status.
Tech support has no further ideas at this time

Any help will be GREATLY appreciated.

[nodle]

Re: Mp 7502 sc 320-01/ sc 380-21

I ordered and replaced the two copper contacts and Holder. It took about an hour and a half to get the holder unit out and replaced. ( nicely buried unit).
Everything is working great now. I can not see any cracks or arching points, but this was definitely the fix.

[slimslob]

Re: Mp 7502 sc 320-01/ sc 380-21

I ordered and replaced the two copper contacts and Holder. It took about an hour and a half to get the holder unit out and replaced. ( nicely buried unit).
Everything is working great now. I can not see any cracks or arching points, but this was definitely the fix.

I have seen contact holders develop microscopic fractures, pin holes and conductive flaws that even though not visible can cause current leakage. I have also seen them deform slightly causing connection problems.

[Zaxxon]

Re: Mp 7502 sc 320-01/ sc 380-21

I ordered and replaced the two copper contacts and Holder. It took about an hour and a half to get the holder unit out and replaced. ( nicely buried unit).
Everything is working great now. I can not see any cracks or arching points, but this was definitely the fix.

Great fix, thanks for sharing this.
I clicked disapprove, by mistake in your reputation sorry...

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

I have this same issue with a MP 7502 and have been fighting it for almost a year. I have found if I put a fresh power supply in the machine will run for about 120K and then go right back to the SC380-21 and SC 320-01 codes.

I have found a engine FW version that mentions SC 380 codes and I am getting ready to go and try that.

What housing and contacts are you speaking of???

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

F/W was a no go

[Iowatech]

Re: Mp 7502 sc 320-01/ sc 380-21

F/W was a no go

It would be more productive if you would start a new thread. Old threads that have been solved contain the answers that should work for this, so if you didn't find a solution here you are facing a different issue.

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

It would be more productive if you would start a new thread. Old threads that have been solved contain the answers that should work for this, so if you didn't find a solution here you are facing a different issue.

In case you didn't notice this problem that I have has been going on for 8 months to a year and I have been masking it with power supply replacement. I have sent a PM to the person that says he has the solution and I have not received the solution at this point.

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

I would appreciate part numbers for the holder and contacts

[bob marley]

Re: Mp 7502 sc 320-01/ sc 380-21

Great fix, thanks for sharing this.

agree with u Zaxxon

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

I suppose I am asking to much here so I suppose I have to assume the contacts and housing are where the development power pack plug in

[Iowatech]

Re: Mp 7502 sc 320-01/ sc 380-21

In case you didn't notice this problem that I have has been going on for 8 months to a year and I have been masking it with power supply replacement. I have sent a PM to the person that says he has the solution and I have not received the solution at this point.

The reason you didn't get an answer to your PM is because this thread was completed quite a while ago, and if it contained the solution to your machine's problem you would have found it already.
Your machine has a different issue. Start a new thread so that the entire community has a chance to get involved.

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

The reason you didn't get an answer to your PM is because this thread was completed quite a while ago, and if it contained the solution to your machine's problem you would have found it already.
Your machine has a different issue. Start a new thread so that the entire community has a chance to get involved.

I am almost positive that this is exactly my problem as I have all of the symptoms reported by the OP. I understand the solution but only wanted clarification of the parts that were required. There is more than one housing with copper contacts on this machine, I would assume that he is talking about the housing that provides the connections to the drum shaft and the mag roller but I don't like to assume and only required clarification, am I to assume that you are a moderator.

If I understand you correctly once a thread here finds a fix and it is posted regardless how vague then someone can no longer send a PM to the posters. The thread was only less than a month old. Sorry I was late to the party and I feel like I am talking to Ricoh proper which is why I have yet to get to the bottom of this issue. Its a State Contract placement with stupid margins and i have 7 or 8 hours into this thing now.

I do want to clarify one thing I am not just a new tech that is looking for an easy fix, I started working as a Tech in 1975.

I ordered all the housings and contacts that have anything to do with image process yesterday and will use the shotgun approach.

[slimslob]

Re: Mp 7502 sc 320-01/ sc 380-21

I am almost positive that this is exactly my problem as I have all of the symptoms reported by the OP. I understand the solution but only wanted clarification of the parts that were required. There is more than one housing with copper contacts on this machine, I would assume that he is talking about the housing that provides the connections to the drum shaft and the mag roller but I don't like to assume and only required clarification, am I to assume that you are a moderator.

If I understand you correctly once a thread here finds a fix and it is posted regardless how vague then someone can no longer send a PM to the posters. The thread was only less than a month old. Sorry I was late to the party and I feel like I am talking to Ricoh proper which is why I have yet to get to the bottom of this issue. Its a State Contract placement with stupid margins and i have 7 or 8 hours into this thing now.

I do want to clarify one thing I am not just a new tech that is looking for an easy fix, I started working as a Tech in 1975.

I ordered all the housings and contacts that have anything to do with image process yesterday and will use the shotgun approach.

Your profile shows that you have been on CTN since May of 2009 but you only have a total of 8 posts and 6 of those have been to this thread. The other 2 are not listed in your profile which indicates that they were before we were hacked nearly 2 years ago. You have no Rep power an only one green card, most likely because no one has dropped a red card on you. The only person who knows exactly what parts took care of the problem is the person who fixed the problem. You should have PMed him and then waited for a response. For all I know, he might be busy and has not been back on CTN to read your PM, if you did actually sent one. The more you keep posting to this thread, the more likely others are going to put you on their ignore list and you end up not getting help on this or any other problem you might have.

[SOMCO TECH]

Re: Mp 7502 sc 320-01/ sc 380-21

Your profile shows that you have been on CTN since May of 2009 but you only have a total of 8 posts and 6 of those have been to this thread. The other 2 are not listed in your profile which indicates that they were before we were hacked nearly 2 years ago. You have no Rep power an only one green card, most likely because no one has dropped a red card on you. The only person who knows exactly what parts took care of the problem is the person who fixed the problem. You should have PMed him and then waited for a response. For all I know, he might be busy and has not been back on CTN to read your PM, if you did actually sent one. The more you keep posting to this thread, the more likely others are going to put you on their ignore list and you end up not getting help on this or any other problem you might have.

I did sent a PM to the original poster, sorry but frustrated with this issue. I will not post here anymore. I have been working in the field since 1975 so it is not real often that I need this site. I have always had issues trying to get any help from Ricoh on problem machines thus the frustration, I saw this post and thought finally someone else has had this issue and I can finally get it sorted.