Sony HCD-MD555, Service Manual

Page: 92 / 124

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Pin No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
I/O
O
I
O
O
O
O
O
O
I
I
I
O
O
O
I
I
I
O
—
I
—
O
O
O
I
O
I
I
O
I
I
I
Description
Over-write head UP/DOWN motor (M905) control signal output. *1
JOG dial pulse input from rotary encoder. Not used in this set (pull up)
Output signal to invert phase of the clock input from the MD WALKMAN
Data latch signal output to LED display. Not used in this set
Not used in this set (open)
Reset control signal output to the A/D, D/A converter. Not used in this set (open)
Not used in this set (pull down)
Power control signal output to peripheral devices. Not used in this set (open)
Input from the chucking completion detector switch
Hall position detection signal input
Disk pack out detection switch input
Loading motor control signal output
Loading motor drive voltage control signal output. Not used in this set (open)
Laser diode ON/OFF control signal output to the automatic power control circuit. “H”: laser ON
Disc reflection rate detection input from the reflection rate detection switch (S682).
“H”: low reflectance disc, “L”: high reflectance disc
Write protection input from the write protection tab detection switch (S683). “H”: protect
Playback position detection switch input. Not used in this set (open)
Control signal output of the recording/playback status. Not used in this set (open)
Power supply terminal (+3.3 V)
Sled limit-in detection switch (S681) input.
“L”: sled limit-in (when the optical pickup comes to the innermost circumference)
Ground terminal
Laser modulation selector signal output to the HF modulation switch circuit
During playback power: “H”, During stop: “L”,
During recording power:
Serial latch signal output to CXD2654AR (IC121)
Laser power selector signal output to CXD2654AR (IC121) and to the HF modulation switch circuit.
“H”: recording, “L”: playback
Not used in this set (pull up)
L3 bus mode signal output
Not used in this set (pull up)
Not used in this set (fixed at “L”)
Record data output enable signal output to CXD2654AR (IC121) and to the over-write head driver (IC181).
Write data transfer timing is output. (It also serves as the magnetic head on/off output)
Interrupt status input from CXD2654AR (IC121)
Input from the record position detector switch. Not used in this set (pull up)
Subcode Q sync (SCOR) of the DIGITAL-IN U-bit CD format is input from CXD2654AR (IC121).
“L” is input every 13.3 mseconds. “H” is input in most cases
Pin Name
HEAD DOWN
HEAD UP
JOG0
JOG1
WMINV
LEDLAT
POTSEL1
DA RST
MUTE
STB
CHACK-IN
HOME
PACK-OUT
LDIN
LDOUT
LD-LOW
LDON
REFLECT
PROTECT
PB-P
REC/PB
3.3V
LIMIT IN
GND
MOD
XLAT
WRPWR
LOADING
SEL:L
L3MODE
—
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SCTX
XINT
REC-P
DQSY
0.5sec
2sec