LG Electronics GSA-4165B, GSA-4168B, GSA-4167B service manual

Block Diagram

LOADING

4.5-5.5V

7-13.2V

GND

5ohm.1 Ron OUTPUT -LO M

LO+ VM3

DSP

H Bridge

+ -

TEST

TEST mode

SPGS Gain Select (SPM)

DSP	DSP
EN 2	EN 1
ENABLE

For

DSP

For /FO/TR/TILT

		P	gain
		M
	-TL	A
				x 12
		L
		T
		B
5ohm.1	TL+		Voltage
Ron OUTPUT	TLIN
DSP
		P	gain
		M
	-TR	A		x 12
		L
		T
		B
5ohm.1			Voltage
	TR+
Ron OUTPUT
DSP
	TRIN
4.5-5.5V	5VCC
	GND
			gain
		P
		M
	-FO	A		x 12
		L
		T
		B
			Voltage
5ohm.1	FO+
Ron OUTPUT	FOIN

Protect Pickup
	ACTFLG
	ACTRST

				M						SLLIM
				W
Currentgain	0.88A/V	CTL	Frequency 75KHz		P
					PWM		CIRCUIT			u
						r
						e
						p
							p
							o
							h				SL1 -
								c
									t
									n
									e
										r
										r
	+		-							C	SL1+
				M					sense		GND
				W			Current
	converter V/V
					P
			SLIDE2
											SL1IN
					r
						CIRCUIT
Currentgain	A/V0.88	CTL	Frequency 75KHz	PWM
						e
						p
						p
							o
							h				-SL2
								c
									t
									n
									e
										r
	+		-							r	SL2+
										u
										C
									sense
	converter V/V							Current
			SLIDE1								SL2IN

DSP

ohm 8.1
Ron OUTPUT
DSP	STM

ohm 8.1
Ron OUTPUT
DSP	13.2V

DSP

gain
Current	3A/V 0.6A/V
SPLIM
	sense
	Current

W

M	V
1ohm	U
Ron OUTPUT

COMMON VM1

		converter V/V
				SPM
						Frequency 150KHz
-				PWM	CIRCUIT			TSD
+
CTL
	WM
		P
		r
		pe			Commutation		commutation
		p
		ho
		c
			nt
				e
				r SWICHING
				ur
				C
				N
				I
				S
GND

FG(x3) Reverse detect

DETECTER EMF BACK

STARTER

STTH

VM2

REF SPIN

FG 6.4MHz

CLK

		7-
DSP		SLIDE
DSP		For
	DSP

For SPINDLE 7-13.2V

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