BS3703 LCR Meter Problem in Inductance ranges.

[aorcan]

Hi all,

I have a BS3703 LCR meter by Caltek Industrial/BST showing 65/7/1... in 4/40/400mH ranges when the probes are shorted. It is probably an offset calibration problem as everything else works fine. The trimming pots, 7 of them are tucked in between two PCB's and I don't want to try them one by one. I would appreciate any assistance, schematic, service manual, tips.

Thanks in advance.