How do I test a specific Orbit Watering station without turning on the whole system?

Save yourself a lot of frustration, replace it. These are not repairable.

Sounds like your zone valve is stuck in the open position,turn off main to system and open up top of valve,clean out and try again.

https://www.orbitonline.com/help_center?stPage=guideListPage-1


This is the location of Orbits Product Manuals! Hope this helps

it may be defective, return to store for a new one

water won't turn off. check if:
watering duration is set to desired time.
start times begin after previous
watering cycle has run
through all stations and set duration's. https://www.orbitonline.com/site_files/manuals/27922-24_rI_web.pdf

Water Budgeting
Water Budgeting is a simple way to adjust your watering
duration to match seasonal watering needs . Water Budgeting
works by increasing or decreasing watering duration for all
stations in each program . Press the [PROGRAM] button to
select the program you wish to budget .
Adjustment range is from 10% to 200% by increments of 10% .
The default value is 100% . The budgeting will remain on the
adjusted range until you change it .

Based on my knowledge of Orbit branded products like yours your timer has failed and you need to replace the unit with another more reliable brand. Orbit has real issues with their designs.

The model of Orbit sprinkler timer you show has 4 or 6 zones for watering. I provide link below for instructions for use. Reading it, I don't think this timer has A, B, C, schedules if that's what you mean (whole different settings on each). Other timers commonly do however that feature in my experience is rarely used. If you don't like this timer, Home Depot has a $20 timer 4 station that I've found is easier to understand than many of them, also a 6 station for a little more same type (think is Orbit not sure). May need to zoom instruction shown from the link.

The product manual is confusing... how do you set 1-5 am and 2-12 pm and 3-5 pm? The manual says to press program button to choose A B or C programs, but does not give steps for programming or when to press enter to confirm setting... or say which position the dial should be in when programming.

57894 lets you program separately for each station...turn dial to Run Time and use arrow keys to select a station. Press enter or arrow keys to advance to next station.
57894 offers 'select a station', 'pick days of the week or interval between watering for that station', 'duration of watering for that station'. But picking days of the week is not the same as setting exact times 1-5 am and 2-12 pm.
The dial is set to auto for programs to operate..
Don't forget to activate battery located top right on face of timer.
http://waterheatertimer.org/pdf/Orbit-57894.pdf

So the 57894 has more options than a 24-hour analog sprinkler timer that repeats same cycle each day with 14-day-skipper.
http://waterheatertimer.org/How-to-wire-Intermatic-sprinkler-timers.html

Gene

Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Question is not clear.
Do you have programming problem with the timer?
Or problem locating sprinkler heads?
Or a sprinkler valve problem?
Add a comment with detailed information.

Sprinkler timer turns ON-and-OFF.
Timer does not advance the sprinkler to next station. The sprinkler valve advances to next station when timer turns OFF.
For example, when timer turns ON, then station 1 starts watering.
Timer turns off, and then sprinkler valve automatically advances to station 2.
Timer turns on again, and station 2 starts watering.

Orbit resources:
http://www.orbitonline.com/support/
http://www.orbitonline.com/lib/media/InstallationGuide.pdf
http://www.irrigationdirect.com/media/manuals/owners-manuals/orbit/Orbit-WaterMaster-57880-Controller-Owners-Manual.pdf

Have you programmed the new one with all the info for date and time? Did you set the zones for the days you want and watering times?

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c