Sony CX-LEM550 User manual

SERVICE MANUAL
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
AEP Model
UK Model
E Model
COMPACT DISC DECK RECEIVER
9-877-819-01
2004F1678-1
© 2004.06
Ver 1.0 2004.06
SPECIFICATIONS
CX-LEM550
Model Name Using Similar Mechanism HCD-NE5
CD Base Unit Name BU-K7BD81B
Section Optical Pick-up Name KSM-213EDP/C2NP
Tape deck Model Name Using Similar Mechanism HCD-GP5
Section Tape Transport Mechanism Type CMAL1Z240A
CX-LEM550 is the Amplifier, CD player,
TapeDeckandTunersectionin XR-EM550.
— Continued on next page —
Main unit
Amplifier section
European model:
DIN power output (rated): 20 + 20 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
25 + 25 W
(6 ohms at 1 kHz, 10%
THD)
Music power output (reference):
38 + 38 W
Other models:
The following measured at AC 230 V or AC 120 V, 50/
60 Hz
DIN power output (rated): 20 + 20 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
25 + 25 W
(6 ohms at 1 kHz, 10%
THD)
Inputs
MD (phono jacks): Sensitivity 450 mV,
impedance 47 kilohms
Outputs
PHONES: Accepts headphones with
an impedance of 8 ohms or
more
SPEAKER: Accepts impedance of 6 to
16 ohms.
CD player section
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Frequency response 20 Hz – 20 kHz
Tape deck section
Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
European model: 531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Other models: 530 – 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna AM loop antenna, external
antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
European model: 230 V AC, 50/60 Hz
Korean model: 220 V AC, 60 Hz
Taiwanese model: 120 V AC, 50/60 Hz
Other models: 110–120 Vor220 – 240V
AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption 67 W
0.3 W (in Power Saving
Mode)

2
CX-LEM550
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 °C
during repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan thosespecifiedhereinmay resultin hazardous radiation
exposure.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
This appliance is
classified as a CLASS 1
LASER product. This
label is located on the
rear exterior.
Dimensions (w/h/d) Approx. 164 × 230.5 ×266
mm incl. projecting parts
and controls
Mass Approx. 4.1 kg
Design and specifications are subject to change
without notice.

3
CX-LEM550
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL ................................................................... 6
3. DISASSEMBLY
3-1. Rear Cabinet .................................................................... 8
3-2. Top Panel Assy ................................................................ 9
3-3. Front Panel Assy.............................................................. 9
3-4. Base Unit (BU-K7BD81B) ............................................. 10
3-5. Tape Cassette Mechanism Deck ...................................... 10
3-6. MAIN Board.................................................................... 11
3-7. AMP Board...................................................................... 11
4. TEST MODE ............................................................... 12
5. MECHANICAL ADJUSTMENTS......................... 13
6. ELECTRICAL ADJUSTMENTS
Deck Section.................................................................... 13
CD Section ...................................................................... 14
7. DIAGRAMS
7-1. Block Diagram – CD Servo Section –............................ 16
– MAIN Section – ........................................................... 17
7-2. Printed Wiring Board – CD Board – .............................. 18
7-3. Schematic Diagram – CD Board – ................................. 19
7-4. Printed Wiring Board – MAIN Board – ......................... 20
7-5. Schematic Diagram – MAIN Board – ............................ 21
7-6. Printed Wiring Board – AMP Section – ......................... 22
7-7. Schematic Diagram – AMP Section – ............................ 23
7-8. Printed Wiring Board – CONTROL Board – .................. 24
7-9. Schematic Diagram – CONTROL Board –.................... 25
7-10. Printed Wiring Board – POWER Board – ....................... 26
7-11. Schematic Diagram – POWER Board –.......................... 27
8. EXPLODEDVIEWS
8-1. Overall Section ................................................................ 34
8-2. Front Panel Assy-1 .......................................................... 35
8-3. Front Panel Assy-2 .......................................................... 36
8-4. Top Panel Assy ................................................................ 37
9. ELECTRICAL PARTS LIST .................................. 38

4
CX-LEM550 SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carryout the “S curvecheck” in“CD sectionadjustment” andcheck
that the S curve waveforms is output three times.
MODEL IDENTIFICATION
– Back Panel –
Model Name PowerVoltage Indication
AEP and UK models 230 V AC, 50/60 Hz 67W
Korean model 220 V AC, 50/60 Hz 67W
Other models (Singapore, 110 – 120 V or
Chilean and peruvian models) 220 – 240 V AC, 50/60Hz 67W
SERVICE POSITION OF THE CD MECHANISM DECK
CD board
CD Mechanism Deck
Power Voltage Indication

5
CX-LEM550
SERVICE POSITION OF THE TAPE CASSETTE MECHANISM DECK
SERVICE POSITION OF THE AMP BOARD
Tape Cassette Mechanism Deck
(CMAL1Z240A)
AMP board

6
CX-LEM550 SECTION 2
GENERAL This section is extracted
from instruction manual.
Main unit
ALBUM +/– qg (10, 11, 16)
BASS/TREBLE 5(18)
Cassette compartment qa
CD SYNCHRO qd (16)
DIRECTION 8(15, 16, 17)
DISPLAY w; (14, 21)
Display window 2
i-Bass 6(18)
OPEN (CD open/close) 4(10)
PHONES jack qf
PLAY MODE 8(9, 11, 16)
Remote sensor 3
TUNER/BAND qj (12, 13)
TUNING +/– qh (12, 13, 18)
TUNING MODE 8(12, 13)
VOLUME 9(19, 23, 25)
?/1 (power) 1(7, 19, 20, 25)
.m/M> (skip back/
skip forward, rewind/fast
forward) qh (10, 11, 15)
x(stop) 7(10, 16, 17, 25)
zREC PAUSE/START qs (16,
17)
CD/NX (play/pause) qk (10,
11, 23)
TAPE/nN (play) ql (15, 16,
17, 20)
Z PUSH (tape open/close) q;
(15)
List of button locations and reference pages
How to use this page
Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.
Illustration number
r
DISPLAY wa (14, 21)
RR
Name of button/part Reference page
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
1234
5
6
7
8
9
qa
0
qs
qdqf
qg
qh
qj
qk
w;
ql

7
CX-LEM550
Remote control
ALBUM +/– qa (10, 11, 16)
CD qh (9, 11)
CLEAR qd (11)
CLOCK/TIMER SELECT 2
(19, 20, 23)
CLOCK/TIMER SET 3(8, 19,
20)
DISPLAY ql (14, 21)
ENTER 9(8, 11, 12, 19, 20)
EQ qs (18)
FM MODE 4(13, 24)
FUNCTION 6(22, 24)
PLAY MODE qk (9, 11, 24)
REPEAT 4(10)
SLEEP w; (18)
TAPE qg (15)
TUNER/BAND 5(12, 13)
TUNER MEMORY qj (12)
TUNING MODE qk (12, 13)
VOLUME +/– 0(19, 23)
?/1 (power) 1(7, 19, 20, 25)
m/M (rewind/fast forward)
7(10, 15)
./> (go back/go forward)
qf (8, 10, 11, 19, 20)
x(stop) 8(10, 16, 17, 25)
X(pause) 8(10, 15)
N(play) 8(9, 11, 20)
+/– (tuning) qf (12, 13)
ALPHABETICAL ORDER
A – O P – Z
BUTTON DESCRIPTIONS
4
5
6
7
8
9
w; 1
qa
qd
qs
ql
qk
qj
qh
qg
qf
0
3
2
*
Use buttons on the remote for the operation.
1Press ?/1 to turn on the system.
2Press CLOCK/TIMER SET.
3Press ./> repeatedly to set the
hour.
4Press ENTER.
5Press ./> repeatedly to set the
minute.
6Press ENTER.
The clock starts working.
To adjust the clock
1Press CLOCK/TIMER SET.
2Press ./> until “CLOCK” appears,
then press ENTER.
3Do the same procedures as step 3 to 6
above.
Note
The clock is not displayed in Power Saving Mode
(page 21).
Setting the clock

8
CX-LEM550 SECTION 3
DISASSEMBLY
•This set can be disassembled in the order shown below.
Note: Follow the disassembly procedure in the numerical order given.
3-1. REAR CABINET
3-1. REAR CABINET
(Page 8)
3-5. TAPE CASSETTE
MECHANISM DECK
(Page 10)
3-6. MAIN BOARD
(Page 11)
3-3. FRONT PANEL ASSY
(Page 9) 3-4. BASE UNIT (BU-K7BD81B)
(Page 10)
3-2. TOP PANEL ASSY
(Page 9)
SET
3-7. AMP BOARD
(Page 11)
2 four screws
(BTP3 × 12)
7 connector
(CN310)
6
8 rear cabinet
5 two screws
(BVTP3
× 10)
1 four screws
(BTP3
× 12)
3 two screws
(BVTP3 × 10)
4 five screws
(BVTP3 × 10)

9
CX-LEM550
3-2. TOP PANEL ASSY
1 claw
3
5 connector
(S820)
4 wire (flat type) (27 core)
(CN305)
2 claw
6 top panel assy
1 wire (flat type) (24 core)
(CN302)
qd flont panel assy
2 wire (flat type) (16 core)
(CN303)
q; wire (flat type) (11 core)
6 two screws
(BVTP3 × 10)
qa screw
(BVTP4 × 8)
9
7
8
5 connector
(CN301)
4 connector
(CN501A)
3 connector
(CN501B)
qs harness
3-3. FRONT PANEL ASSY

10
CX-LEM550
3-4. BASE UNIT (BU-K7BD81B)
3-5. TAPE CASSETTE MECHANISM DECK
1 three screws
(BTP2.6
× 8)
3 wire (flat type) (27core)
(CN201)
2 CD cover
6 two screws
7 two washers
4 two screws
5 two washers
8 base unit
(BU-K7BD81B)
2 four screws
(BVTP3
× 10)
3 two harness
4 plate (shield cassette)
5 tape cassette mechanism deck
(CMAL1Z240A)
1 wire (flat type) (7 core)

11
CX-LEM550
3-6. MAIN BOARD
3-7. AMP BOARD
4 screw
(BVTP3
× 10)
8 MAIN board
7 tuner (FM/AM)
1 connector (CN307)
2 connector (CN308)
3 connector (CN903)
5
6 Remove the solder.
3 two screws
(BVTP3
× 14)
2 connector
(CN308)
4 AMP board
1 connector
(CN307)

12
CX-LEM550 SECTION 4
TEST MODE
COLD RESET
•The cold reset clears all data including preset data stored in
the RAM to initial conditions. Execute this mode when
returning the set to the customer.
Procedure:
1. Press the ?/1button to turn the power on.
2. While pressing the xbutton, press the ?/1button and turn
the [VOLUME] knob in the counter-clock wise.
3. The message “RESET” is displayed and the set is reset.
PANELTEST
•Allsegmentsof liquidcrystal display aretested, andthe version
and released date of the micro computer are displayed.
Procedure:
1. Press the ?/1button to turn the power on.
2. While pressing the [DISPLAY] button, press the ?/1button
and turn the [VOLUME] knob in the counter-clock wise.
Then all segments of liquid crystal display are turned on.
3. Press the [i-BASS] button, the version and released date of the
micro computer are displayed.
example of display:
0116 V202
4. Press the [BASS/TREBLE] button, the model name and
distination are displayed.
example of display:
A20 CE2
5. To exit from this mode, perform the “COLD RESET”.
TUNER STEP CHANGE-OVER
(EXCEPT FOR AEP, UK MODEL)
•Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step.
Procedure:
1. Set the FUNCTION toAM, and press the ?/1button to turn
the power off.
2. While depressing the [TUNING + ] button, press the
?/1button.
3. The message “9K STEP” or “10K STEP” is displayed on the
liquid crystal display, and thus the channel step is changed
over.
M >
Version of micro computer
(In this case, version 202)
released date of micro computer
(In this case, released of January 16)
distination
(In this case, UK model)
model name
(In this case, CX-LEM550)

13
CX-LEM550
SECTION 5
MECHANICAL ADJUSTMENTS
TAPE MECHANISM DECK SECTION
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
3.04 mN • m to 6.96 mN • m
FWD CQ-102C 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.20 mN • m to 0.58 mN • m
FWD CQ-102C 2 to 6 g • cm
back tension (0.02 – 0.08 oz • inch)
3.04 mN • m to 6.96 mN • m
REV CQ-102RC 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.20 mN • m to 0.58 mN • m
REV CQ-102RC 2 to 6 g • cm
back tension (0.02 – 0.08 oz • inch)
6.97 mN • m to 14.02 mN • m
FF/REW CQ-201B 71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.8 mN • m or more
FWD tension CQ-403A 100 g • cm or more
(1.4 oz • inch or more)
9.8 mN • m or more
REV tension CQ-403R 100 g • cm or more
(1.4 oz • inch or more)
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION 0 dB = 0.775 V
Precaution
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
the parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switchesand controlsshould beset as followsunlessotherwise
specified.
TestTape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Check
2. Turn theadjustment screwand check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
set
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)

14
CX-LEM550
CD SECTION
Note:
1. CD Block is basically constructed to operate without
adjustment.
2. UseYEDS-18disc (3-702-101-01)unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
5. Check the focus bias check when optical block is replaced.
+
–
CD board
TP (RFACO)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
1.1
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
0.2 Vp-p
TP
(RFACO)
TP (VC)
– CD BOARD (Conductor Side) –
NX
FOCUS BIAS CHECK
Procedure :
1. Connect the oscilloscope to TP (RFACO) andTP (VC) on the
CD 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
figure below. (eye pattern)
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:
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. Turn the power on.
1. Insert the WS-48B into the deck.
2. Press the nN 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)
R-CH
oscilloscope
L-CH
R-CH
VH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good wrong
MAIN board
SPEAKER terminal (J302)
L-CH
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
frequency counter

1515
CX-LEM550
SECTION 7
DIAGRAMS
•Circuit Boards Location
For Schematic Diagrams.
Note:
•All capacitors are in µF unless otherwise noted. (p: pF).
50WV or less are not indicated except for electrolytics and
tantalums.
•All resistors are in Ωand 1/4W 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:TUNER (FM)
( ): CD PLAY
〈 〉: TAPE REC
•Voltages are taken with aVOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
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
•Abbreviation
E51 : Chilean and peruvian models
KR : Korea model
SP : Singapore model
For Printed Wiring Boards.
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 PRINTEDWIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
Note: The components identified by mark 0or dotted
line with mark 0are 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.
•Indication of transistor.
C
BThese are omitted. E
Q
B
These are omitted.
CE
Q
B
These are omitted.
CE
Q
TUNER unit
MAIN board
CONTROL board
CD board
POWER board
AMP board
HP board

1616
CX-LEM550
7-1. BLOCK DIAGRAM — CD SERVO SECTION —
MIACK
8
PO11/BUCK/AD14
36
MILP
5
RESET
2
MICS
4
MIDIO
6
MICK
7
MP3 DECODER
IC301
A/D
CONVERTER
CH2OUTF
CH2OUTR
23
24
21
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 CLOCK XLAT SBSO
SENS
CD DATA
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+
OPIN-
OUTVREF
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
SCOR
A
MAIN
Section
CD
13
11
12
9
10
14
119
108
21 23
3
1
2
7
TO SERVO AUTO
SEQUENCER
42
51 53
XPCK
112
50 52
45
46
6
XRST
100
X-RST
8
96 97
81
78
117 93
77
86
98 99115107102 105 104 110 111 113 68
95
CD-CLK
97 9
LRCK BCK PCMD
LRCKIA
SDI0
63 66 65
16
BCKIA
15
SFSY/LRCKIB
19
SBSY/BCKIB
18 14
LRCKI BCKI PCMDI
SDO0
62 60 61
1196 10
26
27
28
29
24
22
20
19
37
36
E
B
A
D +3.3V
F
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR
AMP
TRACKING
ERROR AMP
RFACO
FEO
TEO
25
VC VC
E
F
AUTOMATIC
POWER
CONTROL
Q10
APC LD
AMP
LD
LD
VC
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213EDP)
PD
I-V AMP
D
C
EG
IN 41
35
34 EQ
AC_
SUM RFAC
VCA
X171
16.9344MHz
SYSTEM CONTROLLER
IC801 (1/2)
S101
(LIMIT)
MI-DIO-I 99
MI-DIO-O 98
MI-CK 100
MI-CS 4
MI-ACK 1
MP3-REQ 3
MI-LP 5
MP3-RST 2
XTCN 7
STANDBY
3
MP3-STB 6
• R-ch is omitted due to same as L-ch.
XTACN 95
26
1

1717
CX-LEM550
— 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
2TAPE-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 – 16Ω
+
–
–
+R
LJ302
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
RDS DATA RDS DATA
RDS CLOCK RDS CLOCK
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
RDS DATA
RDS CLOCK
25
TA RP
26
TA BIAS
RDS-DATA
RDS-CLK
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
SWITCH
Q806
PLUNGER
DRIVE
Q802, 803
MM
(CAPSTAN/REEL)
(DECK-A)
SOL 10V
MOTOR 10V
PACK
R RFC
PLAY SW
END SW
TA PLAY SW
TA END SW
24
68
67
TA-SW
81 TA SOL
78 TA MO
RMC_IN
29
SYSTEM CONTROLLER
IC801 (2/2)
(EXCEPT SP, E51)
(EXCEPT SP, E51)
(SP, E51)
FAN MOTOR
DRIVE
Q349, 350
+
D307
D388
D319
–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, 313D320
D922, 923
D905
RECT
D920, 921
AMP B+
TO
POWER AMP
AMP B–
VOLTAGE
SELECTOR
S901
+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 75Ω
COAXIAL
VOLTAGE
DETECT
IC803
MAIN POWER
RELAY DRIVE
Q311, 315
+3.3V
REGULATOR
D304
+3.3V
REGULATOR
Q317
M +7V
D +3.3V
CD +1.5V
B+ SWITCH
Q319, 320
94CD ON
85POWER ON
23I_POWER_DOWN
11RESET
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
27, 20
RESET SWITCH
Q801
RY901
+1.5V
REGULATOR
IC303
8
13
14 6
3
11
+INA
+INB
STANDBYB MUTEA
11
MUTEB
OUTA
OUTB
SWITCH
Q806
M301
(FAN)

1818
CX-LEM550
7-2. PRINTEDWIRING BOARD — CD BOARD — •See page 15 for Circuit Boards Location. :Uses unleaded solder.
C10
C260
C14
C15
C16
C18
C11
R405
C316
R354 R353
R352
R351
R302
R253
C315
R191
R172
R171
R162
R313
X171
R121
R12
R11
R10
Q10
C116
C312
C184
C183
C303
C302
C305
C259
C258
C257
C255
C203
C196
C195
C201
C182
C171
C172
C308
C151
C134
C125
C123
R165
R13
C17
FB301
C318
R201
C174R173
R205
C209
C210
C314
M102
S101
M101
IC251
IC101
CN101
CN201
R419
R412
R411
R410
R409
R408
R407
R406
R404
R403
R402
R401
R305
R303
R301
R252
R251
R182
R181
R163
R151
R143
R142
R141
R133
R132
R131
R114
R113
R112
R111
R307 C311
C310
C309
C307
C306
C252
C251
C194
C181
C320
C163
C162
C143
C142
C141
C133
C132
C131
C124
C111
C122
C115
C114
C113
C112
C185
C186
R306
IC303
C317
R203
R161
C161
C211
C212
R204
C213
IC301
C313
M
E
(COMPONENT SIDE)
CD BOARD
1-861-619-
12
(12)
30
31 60
120 91
1
61
90
(CONDUCTOR SIDE)
CD BOARD
1-861-619-
12
(12)
(SPINDLE)
M
(SLED)
13
54
116
17
32
64
49
4833
(LIMIT)
1
27
A
MAIN
BOARD
CN305
TP
(RFACO)
OPTICAL
PICK-UP
BLOCK
(KSM-213EDP/C2NP)
TP
(VC)
17 148
28 22 1521
• Semiconductor
Location
Ref. No. Location
IC101 C-6
IC251 B-4
IC301 B-6
IC303 A-6
Q10 D-3
(Page 20)

1919
CX-LEM550
7-3. SCHEMATIC DIAGRAM — CD BOARD —
/C2NP
R406
R407
R408
R409
R411
R412
R410
C151
R203
C141
R143
R142
R141
C133
R133
R132
R131C134
TP125
TP124
C125 R121
C15
C122C123
C132
C142
R151
C111
C113
C112
C114
R111
TP429
TP428
TP430
TP431
C115
C195
TP432
IC101
C163
R163
C196
R162
C210
C194
R253TP418
JPO004C251R252R251
C16R12
JPO10 R11
C17
C18
R10
TP10
TP11
TP12
TP13
TP14
TP15
TP16
TP17
TP18
TP19
C182
C201
C181
C258
C257
C252
C255
C260
R181
R182
C183
C184
C203
C162
C161
R161
R352 TP427
TP103
TP104
TP105
C209
TP436
TP420
TP421
C186
C185
R191
TP251
TP252
TP253
TP250
C306
R405
R404
R419
R403
R402
R401
R302
C317
R305
R301
C316C315
R313
C307
C302 C303
C305 TP422
C312C313
C314 C311 C309 C308
R303
C310
R353
R354
C11
C10
C14
C116
C318
R307
R351
TP433
TP187
TP401
TP409
TP411
TP410
TP434
TP419
TP412
TP413
TP414
TP415
TP416
TP417
TP408
TP407
TP406
TP405
TP404
TP403
TP402
TP186
R205
C320
C213
C212
C211
TP435
CN101
TP423
IC301
R173
Q10
C143
C171 R171
R172
R165
TP425
TP426
S101
C259
IC251
M102
M101
R201
R204
CN201
FB301
IC303
TP102
R306
R113
JPO102
JPO103
R13
TP424
R112
R114
TP177
C124
C172
C131
C174X171
100
100
100
100
100
100
100
100
10V
0
0.1
3.3k
1k
4.7k
0.01
180k
10k
1M0.1
RFACI
RFACO
0.1 15k
0.1
0.10.1
0.47
1500p
0
3300p
3300p
470p
470p
1k
FFDR
FRDR
TRDR
TFDR
0.1
0.1
MDP
CXD3059AR
0.1
100
0.1
47k
0.1
0.1
10kGAIN_SW
MDP6800p22k10k
1100k
APC 0
220
4V
1000p
3.3
E
D
A
B
C
PD
F+
F-
T-
F-
0.1
100
10V
0.1
0.1
0.1
0.1
0.1
220
10V
100
100
22
6.3V
22
6.3V
100
10V
0.1
0.1
100
100
PCMDI
LRCK
PCMD
BCK
0.01
AVDD
AGND
DGND
470p
470p
0
SP+
SL+
SL-
SP-
0.1
100
100
100
100
100
100
10k
0.01
100k
100k
0.00220.1
220
0.1
0.1 0.1
220
4V MP3GND
0.10.1
47
4V 0.1 0.1 47
4V
100k
0.1
100
100
10
10
0.1
100
10V
0.01
10k
100
MP3VDD
MGND
MP3STB
DOUT
LOUT
ROUT
AVDD
XTCN
XRST
DATA
XLT
CLK
SENS
SCOR
MP3RST
MICS
MILP
MIDIO
MICK
MIACK
MP3REQ
MVDD
00
22p
22p
220p
DVDD
16P
IOP1
TC94A34FG-002
0
2SB169KT146
0.1
22p 470
1M
0
SW+
SW-
0.1
BA5947FM
27P
BH15FB1WG
F
0
1k
FEI
TEI
1
IOP2
15k
15k
VC
330p
27p
100p
0.116.9344MHz
E
F
F
E
D
A
B
C
MIACK
MICK
MIDIO
MILP
MICS
SCOR
SENS
CLOCK
DATA
XRST
XLT
CLOCK
SENS
SCOR
XRST
MP3REQ
DATA
MP3STB
XTACN
XTACN
MP3STB
D
C
B
A
MP3RST
XLT
MP3REQ
MIACK
MICK
MIDIO
MILP
MICS
MP3RST
MDP
SFDR
SFDR
SRDR
SRDR
FRDR
FRDR
FFDR
FFDR
TFDR
TFDR
TRDR
TRDR
F+
F+
T+
T+
T-
T-
F-
F-
MDP
DOUT
DOUT
AOUT1
AOUT2
AOUT1
AOUT2
VC
VCC
PD
LD
T-
F-
T+
F+
VR
AGND
F
C
B
A
E
D
OPIN-
OPIN+
SW
CH1FIN
CH1RIN
CH2FIN
CH2RIN
GND
CNF4
POWVCC
CH2OUTR
CH2OUTF
CH1OUTR
CH4OUTR
CH4OUTF
CH3OUTF
CH3OUTR
POWVCC
MUTE
GND
CH3RIN
CH3FIN
CH4IN
CH4CAPA
OUTVREF
OPOUT
PREVCC
MIRR
NC
DFCT
FOK
VSS
LOCK
MDP
SSTP
IOVSS1
SFDR
SRDR
TFDR
TRDR
FFDR
FRDR
IOVDD1
AVDD0
AVSS0
NC
E
F
TEI
TEO
FEI
FEO
VC
A
B
C
D
NC
AVDD4
RFDCO
PDSENS
AC_SUM
EG_IN
LD
PD
RFC
AVSS4
RFACO
RFACI
AVDD3
BIAS
ASYI
ASYO
NC
VPCO
VCTL
AVSS3
CLTV
FILO
FILI
PCO
AVDD5
DDVROUT
DDVRSEN
AVSS5
DDCR
NC
BCKI
LRCKI
LRCK
VSS
PCMD
BCK
VDD
EMPH
EMPHI
IOVDD2
DOUT
TEST
TEST1
IOVSS2
NC
XVSS
XTAO
XTAI
XVDD
AVDD1
AOUT1
VREFL
AVSS1
AVSS2
VREFR
AOUT2
AVDD2
NC
IOVDD0
RMUT
LMUT
NC
XTSL
IOVSS0
XTACN
SQSO
SQCK
SBSO
EXCK
XRST
SYSM
DATA
VSS
XLAT
CLOCK
VDD
SENS
SCLK
ATSK
WFCK
XUGF
XPCK
GFS
C2PO
SCOR
VDD
C4M
WDCK
COUT
PCMDI
VIN
GND
STBY
NC
VOUT
LOUT
AGND
ROUT
MP3RST
DOUT
MGND
MP3GND
MILP
MICS
MP3REQ
MIACK
MIDIO
MICK
MP3STB
MP3(3.3V)
DVDD(3.3V)
AVDD(3.3V)
MGND
DGND
XTCN
SCOR
SENS
XLT
DATA
XRST
CLK
M+7V
SBSY/BCKIB
SFSY/LRCKIB
TXO
VDD
CKI/CLOCK/
IRQ/FIO
VSS
PIO0/SDI2/IO0
PIO1/SDI3/IO1
PIO2/IO2
PIO3/IO3
PIO4/FI1/BUS0/IO4
PIO5/FI2/BUS1/IO5
PIO6/FI3/BUS2/IO7
PIO7/BUS3/IO7
AD4/PO04
AD3/PO03
AD2/PO02
AD1/PO01
AD0/PO00
VSS
VDD
CKO/PO13/AD16
VDDX
XO
XI
VSSX
TEST
MIMD
VSSP
VCOI
VDDP
RESET
STANBY
MICS
MILP
MIDIO
MICK
MIACK
VDDT
VSS
BCKO
LRCKO
SDO0
SDI0
BCKIA
LRCKIA
DATA
SDI1/
SDO2
CS/RAS/
AD15/CAS/
PO12
SDO3/OE
PO11/BUCK/AD14
PO10/CCE/AD13
PO9/AD12
PO08/AD11
SRMSTB
VDDT
AD10
AD9
AD8
PO07/AD7
PO06/AD6
AD5/
PO05
VDDM
WE/SDO1
AUTOMATIC
CD DSP
(LIMIT)
MOTOR/COIL
(SPINDLE)
(SLED)
+1.5V REGULATOR
MP3 DECODER
CONTROL
POWER
DRIVE
CH1OUTF
•See page 28 forWaveforms. • See page 28 to 30 for IC Block diagrams.
(Page 21)

2020
CX-LEM550
7-4. PRINTEDWIRING BOARD — MAIN BOARD — •See page 15 for Circuit Boards Location. :Uses unleaded solder.
E
E
E
Q333
Q315
Q338
E
Q342
Q343
EE
Q329 Q330 Q328 Q332
Q331
EE E
EE
Q320
E
Q327 Q326
EE
E
IC302
E
E
E
E
E
E
E
E
E
E
E
E
E
E
JR302
JR303
E
CD
BOARD
CN201 AAMP
BOARD
CN308
BCONTROL
BOARD
CN303
C
MAIN BOARD
R
L
1-861-718-
5
6
7
1
2
3
4
L-CH
REC/PB
HEAD
R-CH
ERASE
HEAD
13
2815
1
14
2
654
HP
BOARD
CNB501 D
POWER
BOARD
CN903
E
AMP
BOARD
CN307
F
CONTROL
BOARD
CNB302
G
R
L
+
+
−
−
MD
J303
SPEAKER
IMPEDANCE
USE6-16Ω
J302
(Page 18) (Page 22) (Page 24)
(Page 22)
(Page 26) (Page 22) (Page 24)
• Semiconductor
Location
Ref. No. Location
D301 F-6
D302 C-3
D303 D-3
D304 E-4
D305 B-5
D306 B-5
D307 E-6
D308 F-5
D309 A-4
D310 E-5
D311 E-6
D312 D-3
D313 D-3
D317 E-6
D318 F-4
D319 G-4
D320 C-3
D386 D-5
D387 D-4
D388 D-3
D389 D-3
D390 B-1
D392 C-2
D393 B-2
D396 A-3
IC302 B-5
Q311 F-5
Q312 E-4
Q313 E-4
Q314 E-4
Q315 F-6
Q317 C-4
Q319 D-3
Q320 C-3
Q326 B-6
Q327 B-6
Q328 A-6
Q329 A-6
Q330 A-6
Q331 A-6
Q332 A-7
Q333 F-6
Q334 G-5
Q335 G-5
Q336 G-5
Q337 F-4
Q338 F-6
Q342 C-5
Q343 C-4
Q344 D-6
Q345 D-6
Q346 C-6
Q347 C-5
Q348 D-6
Q349 D-4
Q350 G-4