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LG GSA-4040B Service Manual page 88

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3. Motor, Abnormalities in Actuator System
The drive circuit of a motor & actuator consists of the three ICs IC601 (BD7905BFS), IC603 (BA5962FVM)
and IC602 (BU2507FV). The work of each IC is as follows.
(1) IC601(BD7905BFS) : 6ch driver
Spindle motor driver: 180 degree electronically Type, an analog input, a PWM drive, a Vm=12V.
Stepping motor driver X2: analog input, a PWM drive (differential), a Vm=12V
Loading motor driver: analog input / output (differential), a Vm=12V
Focus actuator driver: analog input / output (differential), a Vm=5V
Tracking actuator driver: analog input / output (differential), Vm=5V
A motor & actuator and its correspondence pin
Signal/CH
Input
Reference
(27)VC 1.65V
Output
A control mode setup by the control terminal
CTL1(22)
CTL2(23)
Low
High
-
(2) IC603(BA5962FVM) : 1ch-BTL Driver
Actuator driver: An analog input / output (differential), Vm=5V
Input : (3)IN1, Reference , (2)BIAS 1.65V ,
Output : (7)OUT+ (6)OUT- (1)STNBY : Low=on / High=off
(3) IC602(BU2507FV) : 6ch-10bit -The DA converter
The serial data supplied from DSP is received and DA output of 6ch is performed.
CH1 : (13)AO1 Stepping motor control signal 1
CH2 : (2)AO2 Stepping motor control signal 2
CH3 : (3)AO3 Actuator control signal
CH4 : (5)AO4 Loading motor control signal
CH5 : (6)AO5 Reference signal (voltage)
CH6 : (9)AO6 Lens position sensor current standard voltage
In addition, the output dynamic range of this DA converter is 0V-3.3V.
90
SPDL-MT
STEP-MT
(24)SPIN
(28)SLIN1
(29)SLIN2
(27)VC 1.65V
(9)U
(37)SLO1+
(11)V
(36)SLO1-
(18)W
(35)SLO2+
(34)SLO2-
SPDL
Low
off
Low
off
High
on
Load-MT
(26)LDIN
(27)VC 1.65V
(50)LDO+
(49)LDO-
SLED
Focus
off
off
off
off
on
on
Focus-ACT
Track-ACT
(53)FCIN
(52)TKIN
(27)VC 1.65V
(27)VC 1.65V
(46)FCO+
(48)TKO+
(45)FCO-
(47)TKO-
Track
off
off
on
Load
off
on
off

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