Sony CX-LEM220 Service Manual ▷ View online
13
CX-LEM220
CD SECTION
Note:
1. CD Block is basically constructed to operate without
adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 M
3. Use an oscilloscope with more than 10 M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
following checks.
5. Check the focus bias check when optical block is replaced.
FOCUS BIAS CHECK
Procedure :
1. Connect the oscilloscope to TP012 (RFACO) and TP013 (VC)
on the BD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the [CD ] button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the [CD ] button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Checking Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.1
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
0.2 Vp-p
NX
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
Adjustment Location:Record/Playback/Erase Head
Tape Speed Check
Mode: Playback
1. Insert the WS-48B into the deck.
2. Press the N button on the deck.
3. Confirm that the frequency counter reads 3,000
2. Press the N button on the deck.
3. Confirm that the frequency counter reads 3,000
± 90 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
set
test tape
P-4-A100
(10 kHz, – 10 dB)
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
SPEAKER terminal (J302)
L-CH
SPEAKER terminal (J302)
L-CH
+
–
–
set
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
SPEAKER terminal (J302)
L-CH, R-CH
frequency counter
+
–
–
BD board
TP012 (RFACO)
TP013 (VC)
TP013 (VC)
oscilloscope
(DC range)
– BD BOARD (Conductor Side) –
TP012
(RFACO)
TP013
(VC)
15
15
CX-LEM220
CX-LEM220
SECTION 7
DIAGRAMS
• Circuit Boards Location
For Schematic Diagrams.
Note:
• All capacitors are in
Note:
• All capacitors are in
µ
F unless otherwise noted. (p: pF).
50 WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
5
: fusible resistor.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground un-
der no-signal (detuned) conditions.
no mark: FM
no mark: FM
〈 〉
: TAPE REC
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER (FM/AM)
J
: CD PLAY
E
: TAPE PLAY
a
: TAPE REC
j
: MD (AUX) IN
For Printed Wiring Boards.
Note:
•
Note:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
Note: The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side : Parts on the pattern face side seen from
(Conductor side) the pattern face are indicated.
Parts face side : Parts on the parts face side seen from
(Component side) the parts face are indicated.
Pattern face side : Parts on the pattern face side seen from
(Conductor side) the pattern face are indicated.
Parts face side : Parts on the parts face side seen from
(Component side) the parts face are indicated.
• Indication of transistor.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
TUNER unit
MAIN board
CONTROL board
BD board
POWER board
AMP board
HP board
16
16
CX-LEM220
CX-LEM220
7-1. BLOCK DIAGRAM — CD SERVO SECTION —
A/D
CONVERTER
CH2OUTF
CH2OUTR
23
24
22
4
5
6
7
17
18
16
15
RFACI
ASYO
ASYI
FILTER
FILO
PCO
CLTV
FILI
DIGITAL PLL
ASYMMETRY
CORRECTOR
EFM
DEMODULATOR
CD DSP
IC101 (1/2)
MDP
DIGITAL
CLV
PROCESSOR
32K
RAM
ERROR
CORRECTOR
INTERNAL BUS
SQCK
SQSO
EXCK
AOUT1
C4M
XTSL
XTAO
XTAI
AOUT2
R-CH
D/A
DIGITAL
INTERFACE
D/A
CONVERTER
SELECTOR
CLOCK
GENERATOR
SUBCODE
PROCESSOR
SCOR
WFCK
XUGF
GFS
EMPH
SENS
DATA
CLOK
XLAT
SBSO
CD SENS
CD DATA
CD XLT
TEI
FEI
FOCUS/
TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
CH3FIN
CH4IN
CH3RIN
CH3OUTF
CH3OUTR
CH1FIN
CH1RIN
CH2FIN
CH2RIN
20
MUTE
SRDR
TFDR
TRDR
FFDR
FRDR
SSTP
COUT
MIRR,
DFCT, FOK
DETECTOR
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU INTERFACE
SCLK
TO CPU INTERFACE
FOK
MIRR
DFCT
2
OPIN+
CH4OUTF
CH4OUTR
27
OPOUT
M101
(SPINDLE)
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
CH1OUTF
CH1OUTR
COIL
DRIVE
M
M
M102
(SLED)
MOTOR/COIL DRIVE
IC251
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
CD DSP
IC101 (2/2)
•
SIGNAL PATH
: CD PLAY
14
13
11
12
CD SCOR
A
CD
13
11
12
9
10
14
112
101
20 22
3
1
2
7
TO SERVO AUTO
SEQUENCER
39
48 50
XPCK
105
47 49
42
43
6
XRST
93
CD XRST
8
89 90
76
73
110
86
72
81
91 92
108
100
95 98 97
103 104 106 64
95
CD CLK
97 9
LRCK
BCK
PCMD
59 62 61
LRCKI
BCKI
PCMDI
58 56 57
96 10
25
26
27
28
23
21
19
18
35
34
E
B
A
D +3.3V
F
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR
AMP
TRACKING
ERROR AMP
RFACO
FEO
TEO
E
F
AUTOMATIC
POWER
CONTROL
Q10
APC LD
AMP
LD
LD
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213EDP)
PD
I-V AMP
D
C
EQ_
IN
38
33
32
EQ
AC_
SUM
RFAC
VCA
X171
16.9344MHz
SYSTEM CONTROLLER
IC801 (1/2)
S101
(LIMIT)
CD XTXCN 7
•
R-ch is omitted due to same as L-ch.
XTACN
88
(Page 17)
17
17
CX-LEM220
CX-LEM220
— MAIN SECTION —
AC
DETECT
Q333, 338
R-CH
+
80
INPUT SELECT,
ELECTRICAL VOLUME
IC302
79
28
REC-O-L
18
OUT-L
13
CONT
21 CD-L
23 TUNER-L
2 TAPE-L
19 AUX-L
REC/PB
SWITCH
Q326 – 332
R-CH
CD
A
• Signal Path
: CD PLAY
: TAPE PLAY
: REC
• R-ch is omitted due to same as L-ch.
: TUNER
CD SERVO
Section
J303
R
MD
L
: AUX IN
J301
PHONES
SPEAKER
IMPEDANCE
USE 6 – 16
Ω
+
–
–
–
+
R
L
J302
FM/AM TUNER PACK
TU LCH
TU RCH
TU CE
CE
R-CH
TUNED
TUNED
STEREO
STEREO
MUTE
TU-MUTING
TU DI
DO
TU DO
DI
TU CL
CLK
CE
TUNED
STEREO
DO
DI
CLK
BIAS OSC
T301
REC BIAS
SWITCH
Q346 – 348
B +10V
BIAS OSC
Q344, 345
ERASE
HRPE301
(REC/PB/ERASE)
TAPE MECHANISM
DECK BLOCK
L-CH
R-CH
R-CH
DC
DETECT
Q342, 343
+
POWER
AMP
IC501
75
TU DI
74
TU CLOCK
73
TU CE
71
TU TUNED
70
TU STEREO
76
TU DO
TA RP
TA BIAS
TU MUTE
TU-MUTING
77
18
I-POWER_MONITOR
28
F-DATA
83
AMP MUTE
84
AU MUTE
82
AMP-STBY
CAPSTAN/REEL
MOTOR DRIVE
Q804, 805
PLUNGER
DRIVE
Q802, 803
M M
(CAPSTAN/REEL)
(DECK-A)
SOL 10V
MOTOR 10V
PACK
R RFC
PLAY SW
END SW
TA PLAY SW
TA END SW
TA END SW
24
68
67
TA-SW
81 TA SOL
78 TA MO
RMC_IN
29
SYSTEM CONTROLLER
IC801 (2/2)
D307
–30V
REGULATOR
Q334 – 337
(AC IN)
SUB POWER
TRANSFORMER
T901
MAIN POWER
TRANSFORMER
T902
AC 3.6V
SYS +3.2V
SYS +3.1V
TO
FLUORESCENT
INDICATOR TUBE
FL –30V
RECT
D911-914
D810
D809
D312, 313
D320
D922, 923
D905
RECT
RECT
D920, 921
AMP B+
TO
POWER AMP
AMP B–
+10V
REGULATOR
IC305
VM +10V
+3.9V
REGULATOR
Q312 – 314
RECT
D916, 917
RECT
D918, 919
RECT
D907 – 910
SYS +3.3V
AM
ANTENNA
FM ANT
AM ANT
ANT GND
ANT GND
FM 75
Ω
COAXIAL
VOLTAGE
DETECT
IC803
MAIN POWER
RELAY DRIVE
RELAY DRIVE
Q311, 315
+3.3V
REGULATOR
D304
+3.3V
REGULATOR
Q317
M +7V
D +3.3V
CD +1.5V
B+ SWITCH
Q319, 320
94
CD ON
85
POWER ON
23
I_POWER_DOWN
11
RESET
REMOTE CONTROL
RECEIVER
IC802
DS G/I-BASS LED
88
LED DRIVE
Q808
D811
i-Bass
ST-BY LED
87
LED DRIVE
Q809
D814
(STANDBY)
X801
32.768kHz
13
12
O-XT2
I-XT1
16
15
X802
10MHz
XOUT
XIN
FL801
FLUORESCENT
INDICATOR TUBE
S1 – 16
G1 – G12
31 – 42
43 – 45, 47 – 50,
52 – 60
22 VOL_ENCODER
66 CD OPEN
ROTARY
ENCODER
RV801
VOLUME
S801 – 815
(FRONT PANEL KEYS)
S820
(CD LID OPEN/CLOSE DETECT)
KEY0,
KEY1
KEY1
27, 20
RESET SWITCH
Q801
RY901
+1.5V
REGULATOR
IC303
8
13
14
6
3
11
+INA
+INB
STANDBYB
MUTEA
11
MUTEB
OUTA
OUTB
(Page 16)
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