Hi
Awesome information
Can you show photos of the affected resistors and also the values of the resistor if possible i have about 40 boards here that I can possibly repair for our testing purposes
Thanks
Shawn Crowther
Sorry for the low res cellphone photo. Look for the black resistors between the large white power connector and the row of capacitors. They are black surface mount devices with a white "0" printed on them.
I am not sure about the value, but if you measure all of them with a DMM, you will find that the one (which is normally discoloured as well) will have a vastly different value than all the others around it.
That one you will have to desolder and replace with another good one. It is normally a good idea to change the polygon motor assembly as well as this causes the fault - and Ricoh has brought out a modified motor that is redesigned to prevent this failure in future.
Hope this helps.
Press the GREEN button!!
Thanks for this
In regards to the soldering process
What wattage iron is best suited for this practice
I had this on few MP5500,and it's never a polygon motor.
It was problem with power supply usualy.
Also defective power supply gives SC 672 sometimes...controler board can't comunicate with operation panel...it can't because it's not powered on propper.
Gears,springs,clutches,sliders,connectors and electronics...who on earth can tell what's wrong with it?
Me and my big tongue...I got a call for sc 202 on MP5500,I'm supposed to go there tomorow.
Now machine we did with this code was in our workshop and it had defective PSU power supply unit...black screen,sc 202...the whole shabang,after that another machine was fixed by my colegue who allso changed power board and solved it.
Now after reading the SC202 posts in here and some service manuals it does make me wonder if customer has THAT exact problem...defective polygon motor and bicu board.
I haven't seen machine yet but before I go there I'd inform myself more on this...it will be field work without safety and comfort of our workshop.
I don't know what is actual BICU board...all i found in service manual is BCU (Base Engine Control Unit),are you guys refering to that board...the one behind the fusing unit,below the fan duct,to the right of the controller box,and abowe the PSU board?
My guess is that is some ocasions Power Board culd operate in such way that it doesn't power up that BICU or BCU (now i'm confused about the name) so it doesn't power on the polygon motor.
Gears,springs,clutches,sliders,connectors and electronics...who on earth can tell what's wrong with it?
Uf ye I forgot to ask about the IPU board...the one related with SC desription.
SC202
Polygon motor error 1: ON timeout
The polygon mirror motor does not reach the targeted operating speed within the
specified time after turning on or changing speed
• Defective or disconnected harness to polygon motor driver board
• Defective polygon motor driver board
• Defective polygon motor.
1. Replace the polygon motor.
2. Replace the laser optics housing unit.
3. Replace the harness.
4. Replace the IPU.
Thanks for the reply.
Gears,springs,clutches,sliders,connectors and electronics...who on earth can tell what's wrong with it?
The resistor with the "0" on it is being used as a "fuse-able link", based on what wattage it allows/disallows, it will "pop" if it is over its limit.
I learned this info from a fellow in the aerospace industry that does board work.
Cheers.
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