HP INDIGO 20K/25K

Hi, just new to this forum. The question I have is about the Bid OPE signal test, I've been running my press with this test failing, Just wondering if anyone knows what is this test for to begin with..

 

Hi sir
The Bid OPE (Optical Print Engine) signal test on an Indigo press is a diagnostic check that verifies the proper functioning of the optical components involved in the printing process. This test ensures that the sensors and optical systems that are critical for maintaining print quality are operating correctly.If this test is failing, it could indicate issues with the sensors, calibration, or other optical components within the print engine. Running the press with a failed Bid OPE signal test might lead to print quality issues, such as color inaccuracies or alignment problems.

 

check the sensors, clean them if necessary,

 

ok, thank you for your response. Where exactly are these sensors located that I can clean.. Are they part of the bid base or bid roller, or are they at the back when I push the bids in.

 

Hi
The sensors involved in the bid OPE signal test are generally located in areas where they can monitor the performance of the BID system and the print engine.
BID Base Area: Some sensors are positioned near the BID base to monitor the development process and ensure proper transfer of ink to the photoconductor. These might include sensors that check the position, movement, and condition of the BID roller.
Inside the Print Engine: Additional optical sensors could be located deeper inside the print engine, possibly near the photoconductor or intermediate transfer media, to verify the consistency and alignment of the printed image.
Near the BID Rollers:There could be sensors around or near the BID rollers themselves. These sensors help monitor the even distribution and application of the ink, ensuring that the BID rollers are functioning correctly.
Behind the BID Units: When you push the BID units back into place, there might be sensors positioned to check the alignment and engagement of the BIDs within the print engine.
To clean these sensors Turn off the press and follow all safety protocols.
Locate the sensors near the BID base or BID rollers, as described in your machine’s manual.
Use a lint-free cloth and isopropyl alcohol to gently clean the sensor surfaces. Be careful not to apply too much pressure. Check the sensor connections to ensure they are properly seated.
Reinstall the BID units carefully after cleaning, ensuring they are fully engaged with the press.
Run the Bid OPE test again to see if the issue is resolved.

If the issue not solved the sensors might be more deeply integrated into the machine's optical system.

 

the OPE test is for the homing of the dev roller. On the ends of the roller are either a blue slotted disk or cap. These can unscrewed and replaced with ones from old/new rollers if needed.
If you have a disk style one they can easily break and the optical sensor will not see all the lines and it will fail.