I have a robinair 34788 and when i tunr it on it shows a massage "hi pressure "

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The Robinair 34788 is an automotive air conditioning service machine that features a large, easy-to-read display. If the display on your 34788 machine appears dim or the contrast is not suitable, it is possible to adjust the display contrast to improve visibility. Here are the steps to adjust the contrast on the Robinair 34788:

1. Turn on the machine and wait for the display to fully light up.
2. Press and hold the "Enter" and "Clear" buttons simultaneously for three seconds.
3. The display will show "Contrast" and the current contrast setting.
4. Use the "+" and "-" buttons to adjust the contrast to your desired level.
5. Once you have set the contrast level, press the "Enter" button to save the setting.
6. The display will show "Contrast Saved" to confirm that the new setting has been saved.

If you are still experiencing difficulty with the display after adjusting the contrast, there may be an issue with the machine's internal components or the display itself. In this case, it is recommended that you contact a qualified service technician for assistance.

Question edited for clarity and FULL 'make model (what it is)'.
Question moved from 'Measuring Tools' to correct category.

Limited help here

https://www.google.com/search?q=Robinair+34788+check+solenoids

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Robinair 34788 Set Up Operation Part #1 - YouTube

? 6:05
www.youtube.com/watch?v=XW8o5tahLpE
Aug 30, 2013 - Uploaded by OTC TOOLS This video takes the viewer through the entire Set Up and Operation of the 34788. The Cool-Tech 34788 ...

Very difficult to troubleshoot remotely. Try the operating manual.

http://www.robinair.com/sites/default/files/539602_Eng.pdf

did you forget to plug it in ???

No, you cant remove tank fill solenoid until close low (Blue) and high (Red) side valve on ISV tank (Internal storage vessel). see attached picture to identify Tank fill solenoid.

Does anyone know the password for service menu on a Snapon eco plus it's a robinair machine

It's seems to be problem with your unit relay board,vacuum pump or pressure transducer.Most of Robinair 34788 machine having same problem.You can try the following 1# Open vacuum pump oil filling cap to release extra pressure from pump.2# Replace new relay board & follow the on screen message(do not skip any option).3# Check pressure transducer is working properly.I hope this will help you.

It's seems to be problem with your unit relay board,vacuum pump or pressure transducer.Most of Robin air 34788 machine having same problem.You can try as follows 1# Open vacuum pump oil filling cap to release extra pressure from pump.2# Replace new relay board & follow the on screen message(do not skip any option).3# Check pressure transducer is working properly.I hope this will help you.