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 | HP Laserjet 3550 50.1 then 50.9 Fuser errors by Johnster (6/5/07 3:53 AM) reply | + / - | Hi,
I have a 3550 and was informed by the user that there was random 50.1 fuser errors. I checked but the printer was still printing although the fuser was down to 2% life.
I ordered a new fuser unit and when arrived i installed and powered on. I tried to print a test page but there was a loud pop from the back of the printer and the 50.1 fuser error was displayed. Thinking this could be a faulty fuser i put the old (But working) fuser back in but the same error was displayed.
When i opened the printer up i noticed one of the ceramic fuses on the bottom board (Near the power with a black mark on it) had blown. I replaced this and put the printer back together. I powered on with the old fuser still in but now am faced with a 50.9 fuser error.
Looking where the electrical fuser / printer connections are i noticed one of the connectors is slightly melted on the printer side, probably happened just before the fuse blew. Im pretty sure the connection should be made as it was not too badly melted.
Anyone have any ideas what to do / check next?
Thanks in advance,
John
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| Re: HP Laserjet 3550 50.1 then 50.9 Fuser errors by Anonymous (6/5/07 7:24 AM) reply | + / - | Hi everyone. Still a little stuck with this. Have removed the PCB's and have not found any blown components etc... Any ideas?
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| Re: HP Laserjet 3550 50.1 then 50.9 Fuser errors by Stephen  (edited 10/1/07 4:54 PM) reply | + / - | Replace the PCB that has the blown fuse on it and get a new fuser.
Where did you get the fuser that caused all the problems? You might be able to get the supplier to replace the board, or at least sell you one cheap.
I suspect that you need:
RK2-0157-000CN Power Supply : Low Voltage power supply - Located on bottom left side of printer - 110 volt
That part is the same in a CLJ 3500, you might be able to get a wole unit for the same price:
http://search.ebay.com
The 3500 uses the same fuser as a 3550, and probably most of the parts other than the formatter are the same.
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 | Re: HP Laserjet 3550 50.1 then 50.9 Fuser errors by Johnster (7/24/07 1:41 AM) reply | + / - | Hi,
Just thought i'd update on the problem with this printer should anyone have a similar problem.
I called HP and logged a call with the helpdesk. They sent out a replacement Fuser free of charge and asked me to test. This i did but encountered the same errors.
They then sent an engineer out (Again free of charge) who diagnosed the problem as a faulty RK2-0157-000CN Power Supply : Low Voltage power supply. He swapped whilst onsite and it is now working fine.
Well done stephen, bang on with your guess there.
Thanks guys
John
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| Re: Re: HP Laserjet 3550 50.1 then 50.9 Fuser errors by stobby2 (10/1/07 4:34 PM) reply | + / - | the fault is definately the power supply board rk2 0157 depending on 110v or 240v. The component is a BCR8KM (Triac or driver l think)this goes down and blows the 8 amp fuse. I have the same fault but cannot find someone to supply this component so at present you will need to fit the complete board, if l find a supplier l will let you know however l am in the UK and l assume you are in the states so you need 110volt power supply rk2 0157. Hope this helps and if you can find a supplier for this component please let me know
roger
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