HP laserjet 2605dn printer door open error

[IndikaKis2]

I had a old laserjet HP 2605dn printer and few days ago I thought to clean the mirrors as it had fading colors. I did clean mirrors (actually there was dust on magento one ) and assempled printer as it was before.  After I did callibrate it. But no output in any of the printouts (nothing at all just blank papers). So I had to remove again and adjust the black scanner box position and put them back together. This time no power and printer didn't switch on. Did remove third time and adjust everything again and assembled. The printer switched on this time and gave the error "door open". Double checked everything and door is closed properly and still give "door open", doesn't even allow to callibate. I tried everything. I opened the front door and pushed the door closing actuator (left to the black toner ) using flat screw driver while printer is on, but no luck and still getting "door open" error. Please help.

[davidzuts]

Just an observation. It appears you are not very careful when reassembling the printer. I assume you used the instructions contained in the attachment and if not go over them. Most times when something does not work after reassembly it means something is not connected or not connected properly. In your case most of the time the issue is one of the connections to the dc controller in the back of the printer is not fully seated into the connector slot on the board.

[IndikaKis2]

Thanks for the info. But that didn't help. I have removed according to the document and double checked everything and put them back. Still giving me same error.

[davidzuts]

Suggest you again remove the laser/scanner assembly and when you put it back in it has to be flush against the frame. Also do this with the front door open. You will know when it is flush as it will not have any wiggle to it. Also do not have any toners installed when you reinstall the laser/scanner.

[IndikaKis2]

Thanks again. I did so when I assemble it.  I did make sure scanner unit completelt stay flat and no wiggle on it. Could it be an issue in high voltage PSU. I have gone through many forums and tried everything ( hard resetting, firmware reinstallation, spool service restarting ... etc). 

One thing that I should say, while printer is on, I opened the front door and pushed the black leaver on the top left (sensor) using a small flat screw driver and error message didn't disappear. Could it be a fault in sensor/sensor flag ? I never traced down the sensor mechanism to it's flag.

Is there anyway to override this "door open" error using some change in that mechanism ( i would be nice if there is a firmware solution not to check front door open)

[IndikaKis2]

I think fault is in DC controller PCA assembly (RM1–3423) board. I have removed power cable from DC controller board and turned on the printer. The "Door open" error still shows. So I feel power not get into DC controller board. Is this could be the error. In left hand side formatter board has little power indicating LED. But there is no power on indicator on DC controller board. anyway to test whether board is OK or not. Voltage test points would be perfect. I have a proper multimer, will it be safe to test this board while power is ON? If so any voltage testing references please?

[IndikaKis2]

Any more suggestion please. I have tested voltages in DC controller. Looks OK with schematic in manual.

[Rytter]

Hi,

Any news on this issue?

I got the exact same printer with the exact same problem. After initial disassembly and cleaning of mirrors I have the same error message.

I do in fact have two identical HP2605DN-printers and am able to supply you with a little more info since I'm able to test functionality on the working printer.

The "Door open" message appears in one of two situations:

A) when the black switch next to the black toner isn't activated (front door is open). I'm not referring to the long white plastic stick that pushes the shutter open in the black laser box - It is a purely mechanical safety mechanism and has no electrical sensor that will report the "door open" message.

B) when the optical photo transceiver (that senses when the top cover is not closed) is blocked by a rotating black plastic arm made of plastic.

I don't know which sensor is causing the error.

I tried to trace the connections. So far I found that:

A) The switch is called SW100 in the technical service manual in the (incomplete) general circuit diagram (Link, page 222). It is soldered onto the High Voltage Power Supply PCB. The switch leads the +24VDC the red wire of the top connector J804 (or J804 1). J804 is not documented anywhere. I guess that Black wire is GND, Red wire is signal from door switch and Yellow wire is the feedback (for somewhere).

B) The optical sensor is directly wired to the duplex driver PCB. I did test the photodiode and it seems to be working ok. I have to be careful since the sensor is pretty close to the high voltage board. I still need to check the duplex driver PCB for further tracing of this signal.

So far I have only one suspicion to what could cause my error. When I disassembled the printer for the first time I skipped some steps and was able to clean the mirrors without removing all the wires and cable trays. I might have stretched some of the wires. It could be the wires for the optical sensor. I 've tested the wires afterwards but didn't find any problem there. 

That all I can provide for now. I hope that somebody can give me a hint so that I can solve this error.

BTW: Can anyone explain me why the diagram on page 222 only shows 21 connection of the 30-pin connector J114? Does anybody have a more detailed diagram?

[Rytter]

I made it!! It is working!

The debugging was hard and took way too many hours. But giving up is not my style. I reverse-engineered part of the duplex driver PCB and the high voltage power supply PCB.

My first post was correct. The door open is caused by one of two conditions, A and B.

I started out testing B (the top cover photo switch that is connected to the duplex driver PCB). It seemed to be working ok. If anyone needs to re-test this, you must measure +3.3 VDC on pin 16 of the big chip on the PCB (RM1-3420) when the photo switch gap is blocked. When clear, the voltage must be near zero.

Then I had to start over and look at A. The front door switch (SW100) is supplied with +24VDC. When the switch is pressed (door is closed) the voltage supplies power to the complete PCB. It is really complicated and the switch must function as a dead-mans switch that removes all high voltage from the printer when door is opened. But the +24VDC is also forwarded to the DC controller board through pin 29 on J801. And this is where I found the fault. Pin 29 in J801 didn’t connect to the flex cable and the signal wasn’t transferred to the DC controller! I soldered a new wire between the two PCBs and the printer is working. 🙂

To anyone having problems like I did, I can tell that any failure in the power supply to the high voltage power supply PCB or in the PCB itself will result in a missing signal like I did and the “Door open” message. For example will disconnecting the flex cable in J801 or removing power supply (J803) also give you a misleading “Door open” message.

I guess that, my mistake was to install the flex cable a bit incorrect so that the +24VDC was short circuited to pin 30 (Ground) and hence frying pin 29 of J802.

[IndikaKis2]

Excellent. I will give it a try and let you know.