AIWA LCXK277
Service Manual

Pin No. 32 33

Pin Name RF_I RF_O

I/O I O

Description Input terminal by capacity combination of RF summing amplifier. Output terminal of RF summing amplifier. Checkpoint of Eye pattern. Anti-reverse input terminal for RF summing amplifier.

34

RF_M

I

The gain of RF amplifier is decided by the connection resistance between RF_M and RFO terminals.

35 36 37

RFTC LD PD

I O I

This is a pin where the selection time constant is externally connected to control the RF level. APC amplifier output terminal. APC amplifier input terminal. RFI-V amplifier inverted input pin.

38, 39

PD1, PD2

I

These pins are connected to the A+C and B+C pins of the optical pickup, receiving by currents input.

40

FEBIAS

I/O

Bias adjustment pin of the focus error amplifier. F and EIV amplifier inverted input pins.

41, 42

F, E

I

These pins are connected to the F and E of the optical pickup, receiving by current input.

43 44 45 46 47 48 49 50 51 52

EI VEE TEO LPFI TEI ATSC TZC TDFCT VC FZC

� � O I I I I I O I

Gain adjustment pin of the I-V amplifier E. (When not in use of BAL automatic adjustment) GND connection pin. Output terminal for tacking-error amplifier. Output E-F signal. BAL adjustment comparator input pin. (Input through LPF from TEO) Input terminal for tracking error. Window-comparator input terminal for detecting ATSC. Input terminal for tracking-zero cross comparator. Capacitor connection pin for the time constant used when there is defect. Output terminal for DC voltage reduced to half of VCC+VEE. Input terminal for focus-zero cross comparator.

38