No power on a Di550

[mitchl]

Machine is dead with leds lit on A-board and image board.The powersupply is putting out 24v and the Accesories have benn disconnected.What should I try? Any Ideas?

[Bizhub]

Remove the fuser unit and see if the copier powers up.
If it does the thermistors are shorting out so get new ones.
If that is not the case check the back of the c board, one the bottom left of the rear of machine I have seen the tracking blown off the board due to shorts.

Regards

[mitchl]

Remove the fuser unit and see if the copier powers up.
If it does the thermistors are shorting out so get new ones.
If that is not the case check the back of the c board, one the bottom left of the rear of machine I have seen the tracking blown off the board due to shorts.

Regards

Didnt fix it, any other ideas?

[Bizhub]

Is the print button glowing ?

If it is the mechanical counter could be the problem

Let me know and I will have a think.

[Bizhub]

Just found this
I hope it is of use to you.

Technical Knowledge Base
* * * Partner Use * * *

Document # :SED-KB-010786

<Problem Information>

Product :

B/W MFP\D4500iD
B/W MFP\D5500iD
B/W MFP\Di450
B/W MFP\Di550

Information Type :

Hardware//

Symptom Category :

Electrical Failure/No power

Symptom :

The machine is not turned on.

Description :

Though the main switch is turned on, the machine does not have power.

Condition :
Location :

Power Unit

Item Number :

100V to 127V area:4002-6201-02, 220V to 240V area:4002-6202-02

Note :

Cause:
While PU1 being manufactured, FET (Q4, Q5), which is located at DC/DC Converter section, is mounted onto the cooling plateplate with a screw. In this step, the Q4 and Q5 are tilted toward the plate and this process puts much stress onto the soldering portion of Q4 and Q5 where they are fastened onto the PU1 board. Furthermore, the soldering portion is exposed to pressure added during transportation and may have a crack. As a result, you cannot get power to the machine.

Service Type (Recommendation) :

On-Site

Countermeasure :

If the symptom happens, please replace your PU1.

1. Temporary measure
The surface of Q4 and Q5 covered with solder has been re-soldered.
<Effective serial numbers of the machines where this measure has been taken>
Di450: 100 to 127V Area XX708776 and onwards
Di450: 220 to 240V Area XX709221 and onwards
Di550: 100 to 127V Area XX705891 and onwards
Di550: 220 to 240V Area XX705961 and onwards

2.Permanent measure
The design of PU1 has been modified.
<Effective serial numbers of the machines where the measure has been taken>
Di450: 100 to 127V Area XX708787 and onwards
Di450: 220 to 240V Area XX711786 and onwards
Di550: 100 to 127V Area XX706356 and onwards
Di550: 220 to 240V Area XX707528 and onwards

:

No

Link to the related PMN :

(E)
MO010431

[mitchl]

It was the B board, which was taken out by the EDH........... Just lovely! thanks for the help guys.