Read Sony CDC-X237 / CDC-X437 Service Manual online
13
CDC-X237/X437
3-1. IC PIN DESCRIPTIONS
• IC202 LC78622NE (DIGITAL SIGNAL PROCESSOR) (SERVO BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
DEFI
I
Defect detection signal (DEF) input (Must be connected to 0 V when unused.)
2
TAI
I
Test input pin A pull-down resister is built-in. Must be connected to 0 V.
3
PDO
O
External VCO control phase comparator output
4
VVSS
—
Internal VCO ground pin Must be connected to 0 V.
5
ISET
—
PDO output current adjustment resister connection pin
6
VVDD
—
Internal VCO power supply pin
7
FR
—
VCO frequency range adjustment
8
VSS
—
Digital system ground pin Must be connected to 0 V.
9
EFMO
O
EFM signal output
10
EFMIN
I
EFM signal input
11
TEST2
I
Test input pin A pull-down resister is built-in. Must be connected to 0 V.
12
CLV+
O
Disc motor control signal output
13
CLV–
O
Can be set to three-value output by microprocessor command.
14
V/P
O
Rough servo/phase control automatic switching monitor output
Outputs a high level during rough servo a low level.
15
HFL
I
Track detection signal input This is a schmitt input.
16
TES
I
Tracking error signal input This is a schmitt input.
17
TOFF
O
Tracking off signal output
18
TGL
O
Tracking gain switching signal output Increase the gain when low.
19
JP+
O
Track jump control signal output
20
JP–
O
Three-value output is also possible when specified by microprocessor command.
21
PCK
O
EFM data playback clock monitor signal output
Output pin 4.3218 MHz when the phase is locked. Not used. (Open)
Synchronization signal detection signal output
22
FSEQ
O
Output a high level when the Synchronization signal detected from the EFM signal
and the internaly generated synchronization signal range. Not used. (Open)
23
VDD
—
Digital system power supply pin
24
CONT1
I/O
General-purpose input/output 1 – 5
25
CONT2
I/O
Controlled by serial data commands from the microprocessor.
26
CONT3
I/O
Any of these that are unused must be either set up as input pin ports and connected to
27
CONT4
I/O
0 V, or set up as output pin ports and left open.
28
CONT5
I/O
Not used. (Open)
De-emphasis monitor signal output
29
EMPH
O
A high level indicates playback of a de-emphasis disc.
General-purpose input/output pin 6. Not used. (Open)
30
C2F
O
C2 flag output pin Not used. (Open)
31
DOUT
O
Digital out signal output (EIJA format) Not used. (Open)
32
TEST3
I
Test input pin A pull-down resister is built-in. Must be connected to 0 V.
33
TEST4
I
Test input pin A pull-down resister is built-in. Must be connected to 0 V.
General-purpose input/output command identifying pin
A pull-down resister is built-in. Must be connected to 0 V when used with functions
34
PCCL
I
similar to those of LC78622E.
H: Control possible only for the general-purpose input/output port command.
L: Control possible for all commands.
35
LMUTE
O
Left channel mute signal output General-purpose input/output pin 7
36
LVDD
—
Left channel power supply pin
37
LOUT
O
Left channel output
38
LVSS
—
Left channel ground pin Must be connected to 0 V.
39
RVSS
—
Right channel ground pin Must be connected to 0 V.
40
ROUT
O
Right channel output
41
RVDD
—
Right channel power supply pin
SECTION 3
DIAGRAMS
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