Nakamichi DVD-15, Service Manual

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MN66261 (CD signal processor) - IC490 on DVD Main P.C.B. Ass’y
Pin No. Port Name I/O FUNCTION
57 /TEST I Test pin (normally, H)
58 SSEL I Output mode select pin for SUBQ pin. (H: Q-code buffer is used)
59 MSEL I Output frequency select pin for SMCK pin. (H: SMCK=8.4672 MHz, L: 4.2336 MHz)
60 RESY O Re-synchronization signal of the frame synchronization signal.
(H: synchronized, L: not synchronized)
61 DO I Drop out signal (H: drop out)
62 EFM O EFM signal output.
63 PCK O PLL extraction clock output. (fPCK=4.3218 MHz in normal playback)
64 PDO O Phase comparison signal between EFM and PCK signal.
IC BLOCK DIAGRAMS