Aiwa CSD-A240 Service Manual page 20

IC DESCRIPTION
IC, LC78622NE
Pin No.
Pin Name
1 DEFI
2 TAI
3 PDO
4 VVSS
5 ISET
6 VVDD
7 FR
8 VSS
9 EFMO
10 EFMIN
11 T2
12 CLV+
13 CLV-
14 V/P
15 HFL
16 TES
17 TOFF
18 TGL
19 JP+
20 JP-
21 PCK
22 FSEQ
23 VDD
24 SL+
25 SL–
26 NC
27 PU IN
28 RW
29 EMPH
30 C2F
31 DOUT
32 T3
33 T4
34 NC
35 MUTEL
36 LVDD
37 LCHO
38 LVSS
I/O
I Defect detection signal (DEF) input. ("L" is applied when not used.)
I For PLL/Test input. (Connected to 0V)
O Phase comparison output to control the external VCO.
– Ground of the built-in VCO. Normally 0V.
I For the connection of a resistor which adjusts the PDO output current.
– Power supply of the built-in VCO.
I Adjusts the VCO frequency range.
– Ground of digital circuits. Normally 0V.
O For slice level control/EFM signal output.
I EFM signal input.
I Test input. A pull-down resistor is incorporated. (Connected to 0V)
O Disc motor control tri-state output.
Output to monitor the automatic switching between the rough servo control and phase servo
O
control. "H" : Rough servo, "L": Phase servo.
I Track detection signal input. Schmitt trigger input.
I Track error signal input. Schmitt trigger input.
O Tracking off output.
O Tracking gain switching output. "L" raises the gain.
O Track jump control tri-state output.
Monitors the clock signal for EFM data playback. 4.3218MHz when the phase is locked.
O
(Not used)
Sync signal detection output. Goes "H" when the sync signal detected from the EFM
O
signal matches the sync signal generated internally. (Not used)
– Power supply of digital circuits.
O Controlled by serial data command issued by the microprocessor.
O Controlled by serial data command issued by the microprocessor.
– Not connected.
I CD pickup inside limit switch.
O CD-RW disc select control.
O Deemphasis monitor. "H": when playing a deemphasis disc. (Not used)
O C2 flag output. (Not used)
O Output a digital OUT signal. (EIAJ format) (Not used)
I Test input. (Connected to 0V)
– Not connected.
O Lch 1-bit DAC/Lch muting output. (Not used)
– Lch power supply.
O Lch output.
– Lch ground. Normally 0V.
– 20 –
Description