HP LaserJet P2035 Power Supply Repair

[FolaniaM]

Hi all

Let's take it easy and fast

I just need to know the exact value of resistor elements on P2035 or P2055 power supply board.

The resistor R503 wich is between the gate - source of main power mosfet (K4005) and R508 which stays between mosfet's gate and transistor Q502's collector.

The technical number of the borad is RM1-6345

Even a high quality image of a part of the backside of one of these boards while showing the values of those SMD resistors as clearly as possible is enought for me.

Thank in advance!

[zoey7886]

@FolaniaM, Welcome to the HP Support Community! We're thrilled to have you on board! 

Thanks for posting your query! We're here to help you get back up and running. To better assist you, could you please share your printer's serial number or product number with us via private message? 

Need help finding your product number? No worries! Check out this handy guide: 
https://support.hp.com/in-en/document/ish_2039298-1862169-16 

To access your private messages, simply click the private message icon on the upper right corner of your HP Support Community profile, next to your profile name. 

Now, let's dive into the issue! Could you please elaborate on what's happening with your printer? The more details you provide, the better we'll understand the problem and the faster we can resolve it! 

We're all ears! 

Regards, 

[FolaniaM]

Hi

Thank you, and yes, i just sent you the required information.

The problem is about power supply which is damaged and aftrer many diagnistics, i found that its mosfet (K4005) is burnt and i guess this happened because those two resistors from backside of the psu board are burnt first and the mosfet faced an over current condition and had not cut off in a proper time as a fraction of a second (mostly because the resistor R503 is there to set this mosfet at the correct bias and R508 to control the feedback and output voltage).

The original written values on those resistors are wiped out dou to thermal damage.

I guess the value of R503 is something between 22K to 47K ohm and R508 maybe less than 470 ohm.

thanks for you help

[FolaniaM · Accepted solution]

For other people interested to solve same problems:

I used MOSFET 2SK3534 instead of 2SK4005 and smd/thin layer resistor (shold be atleast 1/4 w, because the original ones from hp is 1/8 w and will cause damages again if original rated one is used!).

I use a 27k ohm resistor for R503 and a 330 ohm for R508 and the voltage is stable and printer works fine (better than its original state).

One more note: use a glass fuse for the better protection of the board as the ceramic model (slow burn) which is used/suggested by HP is NOT good and can ignore the moment when it should cut the electricity path against an over current / short circuit event.