[Electrical] MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

[racikram24]

Good day to all of you Sir's!

I'm new here at copytechnet and found out that this forums is great especially in the field of photcopiers.

Well, I'm a Technician for Ricoh Copiers (Low Speeds 15-25 cpm).

Currently, we imported around 160 units of MP2000, at first, the refurbishing of the photocopiers is smooth, but after around 2 weeks which is around 100 units had been refurbished, We got a problem with 3 MP2000 machines which has both the same problems, which is ( Error in R B Z ) a paper jam error and when you pulled out the right side door then close it will give you an error SC 121 (which is a scanner problem) and when you turn off the machine and then turn it on again SC 921 (BICU error) and you will smell a burnt board.

The most frustating part is that, I already got 10 units of them with the same problem. Even though I tried to change everything i.E. boards(High voltage Board, Power Supply Board), the same error and will burn the BICU board again.

Please help, If someone knows about this one or encounters the same problem,

Thanks and God Bless!

[teebee1234]

Sounds like there is a wire(s) being pinched during reassembly after the refurbish. A common spot is the interchange unit above the fuser, the harness on the right side is easily pinched. Since your problem is so consistent, I'm wondering if it relates to one particular techs procedure when working on them. You might want to strip one of the problem machines back down and closely examine each piece that is touched, you could very well have a 'EUREKA' moment.

[Iowatech]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

X2 for what teebee said. The only other thing I can think of is there's a motor that is seized up. But I haven't seen that in years.

[kannuki2]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Check the power supply for any loss of 24vdc, unplug the wire harness from the BICU one by one to see which cause the burn. I would try disconnecting CN138 on BICU since it throws SC121 which indicate scanner motor / home position sensor.

Good Luck..

[Polarbear]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

I agree with the above posts.

Question: Do your techs strip the duplex unit as part of the refurb? We had an instance where a tech (when reassembling) pinched the sensor wire of the sensor that sits in the top centre of the duplex, by catching it behind the shiny silver guide plate. This caused a short to ground that popped the BICU.

Also check all looms that run from the duplex to the rear of the machine (there is quite a bunch of them). The frame has quite a few sharp edges which, if the wires are routed wrong, could pinch and potentially cut off a cable.

[racikram24]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Wow, this community really is a friendly and helpful environment.

Thank you for all the effort on giving all of your time just to give me some hints and tips to be able to troubleshoot the problem!
Thanks for all the replies, opinions, suggestions really really appreciate it.

Thank you too to Sir teebee1234 & Sir PolarBear which exactly "HITS" my problem ! I followed all of your instructions and walla, found most of all of my duplex unit had pinched wires.

To Sir Iowatech & kannuki2 more thanks too!

Now, I could work again with telling my technicians (That are all new) to be careful on reassembling the machine and we were all enlightened by this tips,
PS: I only teach them how to repair and reassembly/disassembly the ricoh machines. And I really do love to share them all I know since they're more young than me.

I really really love this forum, from now on I will be looking for topics/problems that I may help.

THANKS GUYS! and GOD SPEED

[racikram24]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Oh got another series of questions though;

* Does the electrical parts be affected by this blowned bicu?
* Is there any way I can revive the BICU ?

Thanks guys !

[Iowatech]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Oh got another series of questions though;

* Does the electrical parts be affected by this blowned bicu?
* Is there any way I can revive the BICU ?

Thanks guys !

I haven't seen a bad BICU board take out anything else.
You might see if a place like HyTech will take the boards back for refurbishing and see what kind of a deal they can give you. We haven't done any inhouse board repair for years, not cost effective around here.

[whitecat]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Check the resistences with the 0 ohm value ( thouse r basiclly fuses) , also a detailed visual check with magnified glass.

[Llama God]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

When you say that you imported them, where did they come from and go to?

[racikram24]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

From Europe Sir ? why'd you ask?

[Polarbear]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Hi

We have our BICU boards repaired, by our electronics department.

They replace the largish ic just to the left of the large black connector where the controller plugs in (Q12) - you will see there is a blister in the middle of the IC.

That is normally all that is damaged when you have this condition. Most companies that do electronic board repairs should be able to source this ic for you and fit it.

This seems to be a transistor - B1412 - i attached the datasheet I found on the internet.

transistor b1412.pdf

[racikram24]

Re: MP2000 always get this error RBZ + sc 121 then BICU IC's BURNS

Hi


We have our BICU boards repaired, by our electronics department.

They replace the largish ic just to the left of the large black connector where the controller plugs in (Q12) - you will see there is a blister in the middle of the IC.

That is normally all that is damaged when you have this condition. Most companies that do electronic board repairs should be able to source this ic for you and fit it.

This seems to be a transistor - B1412 - i attached the datasheet I found on the internet.

[ATTACH]18467[/ATTACH]

WOW! Exactly how it happened.. Big thanks sir PolarBear.. but the problem is , we dont got any electronics department here in our office,

Got a question sir polarbear, will this be able to replace the blistered IC?

NP Low Freguency Power Transistors 2SB1412 B1412 ∞∞

Complements to 2SD2118 (item#140376062937)

Si, Vcbo=-30V, Vceo=-20V, Ic=-5A, Pd=1W


Hfe grade = R

SC-63 SMD package, New

thanks!