New IMC3000 Blowing FU102 fuse on AC Drive PCB

[Batman1976]

Hi Chaps,

I have a new IMC3000 (been in customer couple of months), keeps blowing FU102 fuses on AC Drive PCB, Ricoh have now kindly intergrated the fuses into the PCB so you have to fit complete new board rather than just the cheaper option of a fuse.

Board replaced once with fuser out and FU102 blow straight away. No Obvious short circuits when tested with mutli-meter. Seem to remember 01 or 02 series having an issue with IH Coil and Invertor PCB and the Older models used to blow fuse on PSU.

Anyone seen issue on IMC range?

Thanks

[guitar9199]

I've not seen anything on the Ricoh forums or Tech Pubs about it.

Although it's mounted on the AC Controller, FU102 connects through CN988 to the DC power supply (AZ240323). I'd start looking for shorts there, especially if it blows immediately.

[anothertech]

Get some fuses with long leads on the them to solder on to the board to jump the blown fuse.

[vargue]

i encountered in this befor in mp2000 fuse blown .in winter customer called that machine is dead.i taked alook in psu it reaveld fuse blown .i put another fuse bow bow bow:rolleyes it found out .current regulator.or may bridge recitifier .on of it's terminal short.begine with psu.

[davel]

What draws its power from this fuse, if the PSU replace it. Any indications or is display dead..

[Mark Bbb]

I think Ricoh must take his responsibility and fix this issue while still in waranty.
I don't think the problem is related to a "bad usage" of customer...
Perhaps it was a technician training machine?

[The_man]

mpc 2050's had a habit of blowing rectifier could be using the same type???

[Batman1976]

So it turns out there are some faulty DC PSU boards fitted at factory which are blowing FU102 fuse on the AC Drive board, although on the AC board the fuse is on the DC circuit. (approx 1 in 200 devices).

Ricoh are aware and investigating problem. Current fix is to replace the AC and DC PSU as a pair!!

Thanks for the input chaps.

Batman1976

[Polarbear]

Hi guys

We recently started selling the IMC and IM range here in South Africa.

All was well until we had our first IMC2000 go down last week.

Low and behold FU102 blown.

Further investigation shows TH001 & TH002 on the DC board blown in half.

This leads me to believe that there is some part on the board that fails and causes the short, in other words, it is not a spike from outside that is causing the failure.

Will try and get more answers from the guy doing our board repairs, once we get the boards back.

[Oze]

So it turns out there are some faulty DC PSU boards fitted at factory which are blowing FU102 fuse on the AC Drive board, although on the AC board the fuse is on the DC circuit. (approx 1 in 200 devices).

Ricoh are aware and investigating problem. Current fix is to replace the AC and DC PSU as a pair!!

Thanks for the input chaps.

Batman1976

Yep...I found this out the hard way.
The machine lasted 2 weeks from install.
DC pcb took out the AC PSU...TWICE.
Fitted the first board and bam....ordered a second one as well as the DC pcb to be safe and all was well.