Sony CDX-MP50 Service Manual ▷ View online
10
CDX-MP50
2-6. LEVER SECTION
2-7. SERVO BOARD
4
two claws
1
special screw
7
lever (L)
6
lever (R)
3
tension spring (LR)
2
DISC IN SW board
5
guide (disc)
1
CN3
3
Removal the solders.
7
special screws
8
special screw
2
CN2
optical pick-up block
9
SERVO board
5
P2x3
6
loading motor assy
4
Unsolder the
lead wires.
black
yellow
11
CDX-MP50
2-8. SHAFT ROLLER ASSY, LOAD SW BOARD
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
Fig. 1
1
tension spring (RA)
2
arm (roller)
3
retaining ring (RA)
4
shaft retainer (roller)
5
shaft roller assy
shaft retainer (roller)
shaft retainer (roller)
retaining ring (RA)
arm
arm
washer
washer
6
special screw
7
LOAD SW board
12
CDX-MP50
2-9. FLOATING BLOCK ASSY
2-10. OPTICAL PICK-UP BLOCK
1
tension spring (KF1)
7
compression spring (FL)
8
compression spring (FL)
6
floating block assy
5
Turn loading ring in the
direction of the arrow.
4
Fit lever (D) in the direction of the arrow.
2
damper (T)
3
damper (T)
3
P 2x3
1
P 2x3
2
sled motor assy (M902)
5
optical pick-up (KSS-721A)
7
PICK-UP FLEXIBLE board
4
plate spring (feed)
6
shaft (feed) assy
13
CDX-MP50
3-1. IC PIN DESCRIPTIONS
• IC3 HD6432238RWN35TEI (CD MASTER CONTROL) (SERVO BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
TEST
I
Test mode selection pin Not used. (Open)
2
DECXRST
O
Reset signal output to the DSP IC “L”: reset
3
DECSTBY
O
Standby mode control signal output to the DSP IC “H”: standby
4 – 7
NC
O
Not used. (Open)
8
PH3
I
CD PH3 photo sensor detection signal input Not used. (Open)
9
INSW/PH2
I
CD mechanism disc in switch detection signal input
10
LIMIT_SW
I
CD mechanism in-limit switch detection signal input
11
D_SW
I
CD mechanism down switch detection signal input
12
CVCC
—
System power supply pin (+3.3 V)
13
NC
O
Not used. (Open)
14
VSS
—
Ground pin
15
NC
O
Not used. (Open)
16
PH1
I
CD PH1 photo sensor detection signal input Not used. (Open)
17
EJECT
O
CD mechanism loading motor control signal output (eject operation)
18
LOAD
O
CD mechanism loading motor control signal output (load operation)
19 – 26
NC
O
Not used. (Open)
27
FLAG
I
Correction unable detection signal input
28
RFOK
I
RFOK signal input from the servo IC
29, 30
NC
O
Not used. (Open)
31
TXD
O
UART TXD PC connection output Not used. (Open)
32
RXD
I
UART RXD PC connection input Not used. (Open)
33
XTALEN
O
Crystal oscillation control signal output to the servo IC
34
TSTB
O
CD text parameter strobe signal output to the servo IC
35
STB
O
Data strobe signal output to the servo IC
36
A0
O
Command/parameter identification signal output to the servo IC
“L”: command, “H”: parameter
37
CD_RST
O
Reset signal output to the servo IC
38
PACK
I
CD text pack sync signal input from the servo IC
39
NC
O
Not used. (Open)
40
SELF_SW
I
CD mechanism self load position detection switch signal input
41
NC
O
Not used. (Open)
42
AVSS
—
Ground for A/D converter
43, 44
NC
O
Not used. (Open)
45, 46
NC
I
Not used. (Open)
47
KEY0
I
Key switch signal input in the test mode Not used. (Open)
48
KEY1
I
Mode switch signal input in the test mode Not used. (Open)
49 – 52
NC
I
Not used. (Open)
53
AVREF
—
Reference voltage for A/D converter
54
AVCC
—
Power supply for A/D converter
55
MD0
—
CPU operation mode setting pin Connecting to +3.3 V in this set.
56
MD1
—
CPU operation mode setting pin Connecting to +3.3 V in this set.
57
X1A
—
Sub clock oscillator terminal Not used. (Open)
58
X0A
—
Sub clock oscillator terminal Not used. (Open)
59
RSTX
I
Microcomputer reset signal input
60
NMI
—
Not used. (Fixed at “H”)
61
STBY
—
Not used. (Fixed at “H”)
62
VCC
—
Power supply pin (+3.3 V)
63
XTAL
—
Main clock oscillator pin (12.288 MHz)
64
VSS
—
Ground pin
65
XTEAL
—
Main clock oscillator pin (12.288 MHz)
66
FWE
I
Flash write enable signal input
SECTION 3
DIAGRAMS
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