LG GCC-4242N, Service Manual

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Pin Descriptions
The following table shows a list of I/O pin specifications.
* The following codes are used in the table.
I : Input pin
O : Output pin
I/O : I/O pin
PS : Power supply/Ground pin
MSC: Resistor/Capacitor connection pin or others
No. Name I/O Funtion
1 TCFLTO O Tracking detection filter
2 TCFLTIN I Track detection filter
3 SDOUT O Tracking error signal output
4 SDIN I Comparetor input for anti shock detection
5 GND4 PS GND for SERVO I/F (3.3V)
6 AD0 O servo error signal output for A/D
7 MONI0 O Analog signal monitor output 0
8 MONI1 O Analog signal monitor output 1
9 MONI2 O Analog signal monitor output 2
10 VHALF O Reference voltage output (1.65V)
11 VR06 O Reference voltage output (0.6V)
12 LPC1 I Laser pin input (DVD head)
13 LPC0 O Laser drive output (DVD head)
14 EDRV O Extra power DAC output (DVD head)
15 FPDMN I Front monitor signal reference voltage
16 FPDMP I Front monitor signal input
17 GND3 PS GND for APC(5V)
18 RDRVN2 I APC integrator(READ) negative input2
19 RDRVN1 I APC integrator(READ) negative input1
20 RDRV O Laser drive output(READ)
21 RREFDET I DAC input for READ
22 WDRVN2 I APC integrator(WRITE) negative input2
23 WDRVN1 I APC integrator(WRITE) negative input1
24 WDRV O Laser drive output (WRITE)
25 WREFDET I DAC input for WRITE
26 VCC3 PS Power supply for APC(5V)
27 WAPC I APC write sample&hold timing input
28 RAPC I APC read smaple&hold timing input
/VFOSHO
RT
29 XSTANBY I STANBY setting
30 VSS PS GND for LOGIC(5V)
31 ACK I signal selecter clock for A/D
32 ACLR I signal selecter reset for A/D
33 XWTGT I Write gate signal input
34 TOK O Comparetor output for anti-shock
35 STDIO I/O Serial data Input/Output
36 SEN I Serial enable input
37 SCK I Serial clock input
38 NCI - Non connection
39 VDD PS Power supply LOGIC(5V)
40 BDO O BDO output
41 OFTR O OFTR&TC output
42 ROPCSH1 I ROPC1 sample&hold timing input
/IDGT
43 ROPCSH2 I ROPC2 sample&hold timing input
/DTRD
44 GND2 PS GND for RF(5V)
45 CDEFECT - DEFECT envelope detection filter
46 RFENV O RF envelope output
47 PKC MSC Peak envelope detection filter
48 BMC MSC Bottom envelope detection filter
No. Name I/O Funtion
49 VCC5 PS Power supply CMOS I/F (3.3V)
50 NC2 - Non connection
51 DFLTOP O Filter amplifier positive output
52 DFLTON O Filter amplifier inverted output
53 DCFLT MSC DC cut filter for Filter output
54 AGCO I RF AGC amplifier level control
55 AGCG I RF AGC amplifier gain control
56 RFINP I RF signal positive input
57 RFINN I RF signal inverted input
58 TESTSG I I TEST signal input
59 DCRF MSC DC cut filter for RF amplifier
60 WRFIN I Write RF signal input
61 VCC2 PS Power supply RF (5V)
62 RFDIFO O Radial differential output
63 RFOUT O RF signal output
64 VREF O Reference voltage output(2.2V)
65 RSCL I S Line current setting
66 CRECD I DC cut filter for RECD
67 JLINE I J Line current setting
68 NC2 - Non connection
69 CWBL MSC DC cut filter for wobble
70 WAGC3 MSC WBL AGC3 amplifier gain control
71 WAGC2 MSC WBL AGC3 amplifier gain control
72 WAGC1 MSC WBL AGC2 amplifier gain control
73 WHPF1 MSC WBL HPF1 capacitance connection
74 WHPF2 MSC WBL HPF2 capacitance connection
75 VCC1 PS Power supply SERVO/WBL(5V)
76 WBL O Wobble signal output
77 SCFCLK I Clock input for Wobble BPF
78 NC3 - Non connection
79 WSH I WBL sample hold timing input
80 SSH I Servo Sample hold timing input
81 GND1 PS GND for SERVO/WBL(5V)
82 AIN I AIN input
83 BIN I BIN input
84 CIN I CIN input
85 DIN I DIN input
86 EIN I EIN input
87 FIN I FIN input
88 GIN I GIN input
89 HIN I HIN input
90 HDVREF I Detector signal Reference voltage
91 FO1 I FO1 input
92 FO2 I FO2 input
93 TR1 I TR1 input
94 TR2 I TR2 input
95 TR3 I TR3 input
96 TR4 I TR4 input
97 TR5 I TR5 input
98 TR6 I TR6 input
99 VCC4 PS Power supply SERVO I/F(3.3V)
100 TEZX O TEOUT in radial seeking