Head Load Waveform; Trim Pots - NEC FD1165 Maintenance Manual

5.6

TRIM POTS

There are three trim pots on the PCB of the Model FD1165.
RVl and RV2 determine the write current.
at the factory and should never be adjusted in the field.
RV3 determines the speed of the spindle motor.
pot is adjusted for an index pulse width of 166.6 + 0.5 ms.
Figure 5-8

Head Load Waveform

5-11
They are adjusted
This trim