Trim pot just in front of the CPU card slot, left of the RTC battery.
OK, it's a varicap really, Labelled VC880 or similar.
EDIT: It's further over to the left on a rev 6 A2000, in front of the first Zorro socket. But I recall you had V4.
ahh that's right.. I knew that but until you said something, I had completely forgot about that.. This board I will be able to correct I hope but the next one.. I will have to replace that as the battery exploded on that board I got from someone and that pot is corroded badly.
The good news, my V6 boards, I have two, are in the best shape of everything I have thankfully. What I am trying to get going are older 4.x boards with various problems. Two so far running good, one with v1.3 OS/A2090 w/st-506 drives, the second 2.04 OS and A2091 with SCSI drives, this nightmare unit is supposed to be 3.2 os with A2091 SCSI, another identical board has a GVP HD board and GVP 68030 w/daughter ram board (note identical rev 4.x and this one runs perfectly with SCSI drives which makes me think you are right and it is either a scsi.device issue in KS3.2 or the 7.0 roms) and then the two rev 6 units, one using the PI-Raspberry upgrade, the other I had intended on doing another A2091 SCSI setup with 3.5/3.9 updates to it.
So thanks for the help and reminders! Amazing how much one does not really forget but gets pushed to the archives of long term memory until nudged! LOL