Nakamichi DVD-15, Service Manual

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Pin No. Port Name I/O FUNCTION
75 JIT I Jitter level signal input.
76 VREF I Reference voltage input.
78 AS2 I PD all addition signal input.
79 FE I Focus error signal input.
80 RFENV I RF envelope signal input.
81 AS1 I Addition signal of inner 4 divided PD.
82 TE I Tracking error signal input.
83 AVDD1 I Power supply for analog circuit.
84 VREF0 I Analog reference voltage input (2.5V).
85 VREFH2 I Analog high level reference voltage input (3.75V).
86 VREFL2 I Analog low level reference voltage input (1.25V).
87 AVDD2 I Power supply for analog circuit.
88 TBAL O Tracking balance adjust output.
89 FBAL O Focus balance adjust output.
90 FOD O Focus drive signal output.
91 TRD O Tracking drive signal output.
92 AVSS2 I Ground pin for analog circuit.
93 TESTD I Test mode setting pin (normally open).
94 MINTST I Test mode setting pin (normally open).
100 PWMCTL l PWM output control signal input (normal: L).
MN67700 (Servo processing) - IC300 on DVD Main P.C.B. Ass’y
IC BLOCK DIAGRAMS