AIWA XPC578
Service Manual

Pin No. 32 33

Pin Name LF I LF O

IJo I

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

0
I

34

I

LF M

I

I

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

35 36 37
38,39

LIWC LD PD PD1, PD2

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.

I

I I I Theseare connected to the A+C and B+D pins of the optical pickup, receiving by pins
currents input.
1/0

40

FE(NC)

Bias adjustment pin of the focus error amplifier. (Not used.) F and EIV amplifier inverted input pins.

41,42

F, E

I

These pins are connected to the F and E pins of the optical pickup, receiving by current I input. Gain adjustment pin of the I-V amplifier E. (When not in use of BAL automatic adjustment).

I

I
EI(NC) �

I
43

GND connection pin. Output terminal for tracking-error amplifier. Output E-F signal. BAL adjustment comparator input pin. (Input through LPF from TEO) 47 48 49
50 51

I

TEI ATSC

I I

I I

I I

Input terminal fortracking error. Whdow-comparator input terminal for detecting ATSC. Inputterminalfortracking-zerocrosscomparator. Capacitor connection pin forthetimc constant used when there is defect. Voltage center of DC voltage reduced to half between VCC and VEE. Input terminal for focus-zero cross comparator.

I

I
I

Tzc
TDFCT
Vc

III
I I
o

I

52

F�Zc

I

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