LG LPC-M140A Service Manual page 25

PIN NO. SYMBOL DESCRIPTION
29 FEI Focus error signal input pin
30 SBAD Sunbeam addition signal input pin
31 TEI Tracking error input pin
32 TEZI Tracking error/zero-cross signal input pin
33 FOO Focus equalizer output pin
34 TRO Tracking equalizer output pin
35 RFGC Contol signal output pin for adjusting RF amplitude
36 TEBC Tracking balance control signal output pin
37 SEL APC circuit ON/OFF signal output pin
38 FMO Feed equalizer output pin
39 DMC Disc equalizer output pin
40 CVDD Logic power supply pins for the CD processor block
41 XO Input/output pins for the CD
42 XI Input/output pins for the CD
43 CVSS Logic power supply pins for the CD processor block
44 DVDD DA converter block power supply pin
45 RO R-ch data forward rotation output pin
46 DVSS DA converter block ground pin
47 LO L-ch data forward rotation output pin
48 DVR Reference voltage pin
49 RESET System reset input pin for the device
50 MX 1 2-bit CMOS I/O port
51 MX 0 2-bit CMOS I/O port
52 COM 1 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
53 COM 2 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
54 COM 3 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
55 COM 4 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
56 S 1 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
57 S 2 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
58 S 3 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
59 S 4 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
60 S 5 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
61 S 6 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
62 S 7 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
63 S 8 24-bit CMOS I/O port ,3bit N-CH open-drain I/O port
64 S 9 I/O port 5-0 , LCD segment output
2. TA2157FN ( RF AMP IC )
PIN NO. SYMBOL DESCRIPTION
1 VCC 3.3V power supply pin
2 FNI Main-beam amp input pin
3 FPI Main-beam amp input pin
4 TPI Sub-beam amp input pin
5 TNI Sub-beam amp input pin
6 Monitor photo diode amp input pin
7 LDO Lasser diode amp output pin
8 SEL APC circuit ON/OFF control signal
9 TEBC Tracking error balance adjustment signal input pin
10 TEN Tracking error signal generation amp negative-phase
11 TEO Tracking error signal generation amp output pin
12 RFDC RF signal peak detection output pin
13 GVSW AGC/FE/TE amp gain change pin
14 VRO Reference voltage(VRO) output pin
15 FEO Focus error signal generation amp output pin
16 FEN Focus error signal generation amp negative-phase
17 RFRP Signal amp output pin for track count
18 RFRPIN Signal generation amp input pin for track count
LGE Internal Use Only
VOLT(V) I/O PIN NO.
1.6V 19
1.0V 20
1.6V 21
1.6V
22
1.6V
23
1.6V
24
1.6V
1.6V
1.6V
1.6V
3. MM1669XP ( DRIVE IC )
3.2V
3.2V
1.5V
PIN NO.
1.6V
1
0V
2
3.2V
3
1.6V
0V
4
1.6V
5
1.6V
6
3.2V
7
3.2V
8
3.2V
9
1.6V
10
1.6V
1.6V 11
1.6V
12
1.6V
13
1.6V
14
1.6V
15
1.6V
16
1.6V
17
1.6V
3.2V 18
3.2V 19
3.2V
20
21
22
23
24
VOLT(V) I/O
25
3.2V
26
1.6V I
27
1.6V I
28
1.6V I
29
1.6V I
30
0.5V I
2.6V O
0V I
1.6V I
1.6V I
1.6V O
1.0V O
2.8V I
1.6V O
2.8V O
1.6V I
0.7V O
1.6V I
2-17 2-18
SYMBOL DESCRIPTION
RFGO RF signal amplitude adjustment output pin
RFGC RF amplitude adjustment control signal input pin
AGCIN RF signal amplitude adjustment amp output pin
RFO RF signal generation amp output pin
RFN RF signal generation amp input pin
GND GND
SYMBOL DESCRIPTION
FA - Driver CH 1 negative output
FA + Driver CH 1 positive output
FA IN+
Driver CH1 input
NC NC
TRB Connect to exteranl transistor base
VERG-OUT Constant voltage output, connects to exrternal transistor
NC NC
GND GND
SP IN - Driver CH 2 input , gain adjustment pin
SP IN + Driver CH 2 input
SP + Driver CH 2 positive output
SP - Driver CH 2 negative output
SUB-GND Substrate GND
OP OUT Operatinal amplifier output
OP IN (-) Operatinal amplifier input, negative
OP IN (+) Operatinal amplifier input, negative
SL - Driver CH 3 negative output
SL + Driver CH 3 positive output
SL IN + Driver CH 3 input
SL IN - Driver CH 3 input , gain adjustment pin
VCC VCC
VCC VCC
BIAS-IN Bias amplifier input
TA IN + Driver CH 4 input , gain adjustment pin
TA IN - Driver CH 4 input
TA + Driver CH 4 positive output
TA - Driver CH 4 negative output
SUB-GND Substrate GND
GND GND
GND GND
VOLT(V) I/O
1.1V O
1.6V I
2.3V I
0.8V O
1.6V O
0V I
VOLT(V) I/O
3.2V
3.3V
1.6V
0V
0V
1.6V
7.2V
0V
0V
1.6V
1.6V
3.2V
3.2V
0V
6.6V
0.9V
0.9V
3.2V
3.2V
1.6V
1.6V
7.2V
0V
7.2V
1.6V
1.6V
1.6V
3.2V
3.2V
0V
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Only for training and service purposes