Focus On Waveform; Spindle Control Waveform (No Disc Condition) - LG DP271, DP271B, LPA-837 Service Manual

4. FOCUS ON WAVEFORM

FOSO(U401 PIN11)
F+(U401 PIN8)
F-(U401 PIN9)

5. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)

DMSO(U401 PIN12)
SP-(U401 PIN15)
SP+(U401 PIN14)
FIG 4-1
FIG 5-1
3-22