Do not wait for your FM8900S to fail. Download the official service manual today, study the block diagram, and store a printed copy in your equipment rack. When the day comes that your frequency counter goes dark or drifts out of spec, you will thank yourself.
If you tell me which or error code you are dealing with, I can provide more targeted technical steps for your repair. fm8900s service manual
The user manual covers basic operation, wiring, and setup. The service manual goes deeper into hardware, calibration, fault finding, and repair. Do not wait for your FM8900S to fail