Service manual

68
DV-NC55U/C/M
DAC I/F
DAC
1bit DAC
for
CD-DA
Clock
PLL
Micom
I/F
Micom BUS
Servo
Control
DEQADC
Digital Servo
Data
Slicer
PLL
Slice
level
Gen.
Syndrome
operation
ECC
Output
I/F
DRAM
I/F
SYNC Det.
Demodulation
Servo signal
from RFamp
RF signal
from RFamp
to RFamp
to DRAM
to DECORDER
to Micom
Analog
out
Digital
in
to Driver, RFamp
• Block Diagram
Pin No. Terminal Name In/Output Operation function 3/5V system Remarks
156 EXTAD Input General-purpose external ADC input 3V system Analog input terminal
157 VREF – Reference power supply for analog system 3V system
only: 1.65V
158 FOO Output Focus EQ output 3V system Analog output terminal
159 TRO Output Tracking EQ output 3V system Analog output terminal
160 AVDD – Power supply for 3.3V analog system only –
161 AWCTL Output Active wide PLL control output 3V system Analog output terminal
162 FMO Output Feed EQ output 3V system Analog output terminal
163 DMO Output Disc EQ output 3V system Analog output terminal
164 TEBC Output Tracking balance control signal 3V system Analog output terminal
165 FEBC Output Focus balance control signal 3V system Analog output terminal
166 DPDC Output DPD error signal/pit depth adjustment signal 3V system Analog output terminal
167 EQBC Output RF wide boost adjustment signal 3V system Analog output terminal
168 ANMON Output General-purpose PWM output 3V system Analog output terminal
169 /DFCT Output Black dot detection signal 3V system
170 VRCK Output RF EQ property control clock 3V system
171 VSS3 – 3.3V digital ground –
172 SCD Output Head amplifier serial data
173 SCL Output Head amplifier serial data latch pulse 3V system
174 SCB Output Head amplifier serial data clock 3V system
175 FGIN Input Disc FG signal input 3V system Feedback resistor
(with self-bias circuit) Analog input terminal
176 ASLCP Output Data slice positive pole output 3V system Analog output terminal
Note) Terminals with "/" at the beginning of their names are active "L" ones.