LG BP50NB40, Service Manual

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4. Spindle Circuit
4-1-1. Block Diagram(FGCAV Servo)
4-1-2. FG CAV Servo
1) CD 48x CAV : CD-ROM, CD-R
2) CD 40x CAV : CD-RW
3) DVD 13x CAV : DVD+RW
4) DVD 12x CAV : DVD-ROM DL
5) DVD 16x CAV : DVD-ROM
6) DVD 16x CAV : DVD+R
When drive read PRESS CD, Closed Session CD-R/RW, the spindle motor is controlled using FG CAV Spindle
Servo. FG signal(TPIC2016G4 19pin) input to SFG in DSP ICMT1959 44pin).
The spindle controller in DSP IC uses SFG as spindle rotation frequency feedback, therefore the FG CAV
Spindle Servo doesn't work well if FG generation is abnormal.
The spindle controller PWM output signal SPD(MT1959 34pin) input to SPIN in Drive IC(TPIC2016G4 1pin)
after Low-Pass Filtering.
The PWM output signal U, V, W signal(TPIC2016G4 12, 13, 14pin) drives Spindle Motor without using a sensor,
and FG pulse output is generated as 18 pulses/rotation.
IC101
MT1959H
IC601
TPIC2016G