LG GCC-4520B Service Manual page 39

178 WFPDSH
181 RFPDSH
195 WBLSH
193 SRVSH
176 WBLCLK
Servo (10)
210 ADCVDD33
194 HRFZC(PHTO)
192 LRFZC(BLANK
/DEFECT)
208 RFLEVEL
207 FEI
206 CSO
205 TEI
204 TEZISLV
202 ADIN
201 VDCVSS
MOTOR (15)
200 AMON
199 PWM2VREF
198 PWMVREF
209 AMOP
12 FOO
13 TRO
18 FMO
17 DMO
14 FMO2
19 TRAYPWM
20 FG
42
Sample pulse control signal for RF write APC.
3.3V LVTTL output,
Default : 8mA
Slew rate, 2mA,
4mA, 6mA, 8mA,
10mA, 12mA, 14mA,
16mA PDR
Sample pulse control signal for RF read APC.
3.3V LVTTL output,
Default : 4mA
2mA, 4mA, 6mA,
8mA, 10mA, 12mA,
14mA, 16mA PDR
3.3V LVTTL output,
Sample pulse for wobble signal.
2mA, 4mA, 6mA,
Default : 4mA
8mA, 10mA, 12mA,
14mA, 16mA PDR
Sample pulse for servo signal (main beam/side beam)
3.3V LVTTL output,
Default : 4mA
2mA, 4mA, 6mA,
8mA, 10mA, 12mA,
14mA, 16mA PDR
Wobble processing clock output for MT1616.
3.3V LVTTL output,
Slew rate, 4mA
driving
Power Power pin for ADC circuitry.
3.3V LVTTinput 1. High frequency RF ripple zero crossing.
SMT 2. receiving photo signal from 1616.
3.3V LVTTinput, 1. low frequency RF ripple zero crossing.
SMT 2. Blank detect for DVD RAM.
3. When DVD receiving defect signal for BCA application.
Analog input Sub beam add input of RFRP low pass input.
Analog input Focus error input.
Analog input Central servo input.
Analog input Tracking error input.
Analog input Tracking error zero crossing low pass input.
Analog input General A/D input.
Ground Ground pin for ADC circuitry.
Analog input Output Analog monitor negative pin
Analog input A reference voltage input for PWM circuitry. A typical value of 2.8v.
Analog input A reference voltage input for PWM circuitry. A typical value of 1.4v.
Analog input Output Analog monitor positive pin
Analog Output Focus servo output. PDM output of focus servo compensator.
Analog Ouptut Tracking servo output. PDM output of tracking servo compensator.
Analog Output Feed motor control. PWM output.
Analog Output Disk motor control output. PWM output.
Analog Output Feed motor 2 control. PWM output.
Analog Output Tray PWM control output. Controlled by µP.
3.3V LVTTL Input, Motor Hall sensor input.
SMT, 75K pull-up