I am searching for a SERVICE manual for an Avcom PSA 37-d. Does anyone have a pdf or know where I might find one? Google search is not providing much help.
This probably won't help, it's the operation manual. Probably contact Avacom about a service manual directly, there's a phone number at the top right of this page:
Yes the manual would be a good place to start then after reading and trying some simple alignment procedures within that read, you can look for problems after that. I find I need to leave mine on for 20-30 mins to warmup for best accuracy. Having said that, I find that is a good overall tool for setting up dishes, checking LNB condition/slope, cable runs to the dish/receiver and on and on..
Thanks to all for the help on this. I never did find a service manual but I did find enough info to realize I did not have a calibration issue after all.