NEC FD1165 - 5.6 Trim Pots

HEAD LOAD SIGNAL~ _
READ OUTPUT ----1--
UNSTABLE
REGION
5.6 TRIM POTS
30 ms
Figure 5-8
WITHIN 100MS
Head Load Waveform
There are three tr im pots on the PCB of the Model FDl165.
RVl and RV2 determine the write current. They are adjusted
a t the factory and should never be adj usted in the fi eld.
RV3 determines the speed of the spindle motor. This trim
pot is adjusted for an index pulse width of 166.6 + 0.5 ms.
5-11