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Sony CX-LEM550 Service Manual
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Sony CX-LEM550 Service Manual

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SERVICE MANUAL
Ver 1.0 2004.06
CX-LEM550 is the Amplifier, CD player,
Tape Deck and Tuner section in XR-EM550.
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.
Sony Corporation
9-877-819-01
Home Audio Company
2004F1678-1
Published by Sony Engineering Corporation
© 2004.06
CX-LEM550
Model Name Using Similar Mechanism
CD
Base Unit Name
Section
Optical Pick-up Name
Tape deck
Model Name Using Similar Mechanism
Section
Tape Transport Mechanism Type
SPECIFICATIONS
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)
COMPACT DISC DECK RECEIVER
AEP Model
UK Model
E Model
HCD-NE5
BU-K7BD81B
KSM-213EDP/C2NP
HCD-GP5
CMAL1Z240A
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 V or 220 – 240 V
AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
67 W
0.3 W (in Power Saving
Mode)
— Continued on next page —

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Summary of Contents for Sony CX-LEM550

  • Page 1 CX-LEM550 SERVICE MANUAL AEP Model UK Model Ver 1.0 2004.06 E Model CX-LEM550 is the Amplifier, CD player, Tape Deck and Tuner section in XR-EM550. Model Name Using Similar Mechanism HCD-NE5 Base Unit Name BU-K7BD81B Section Optical Pick-up Name KSM-213EDP/C2NP...
  • Page 2 COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON 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.

  • Page 3: Table Of Contents

    CX-LEM550 TABLE OF CONTENTS SERVICING NOTES DIAGRAMS ..........4 7-1. Block Diagram – CD Servo Section – ......16 GENERAL – MAIN Section – ............17 ..............6 7-2. Printed Wiring Board – CD Board – ......18 7-3. Schematic Diagram – CD Board – ......... 19 DISASSEMBLY 7-4.

  • Page 4: Servicing Notes

    CX-LEM550 SECTION 1 SERVICING NOTES MODEL IDENTIFICATION NOTES ON HANDLING THE OPTICAL PICK-UP – Back Panel – 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.
  • Page 5 CX-LEM550 SERVICE POSITION OF THE TAPE CASSETTE MECHANISM DECK Tape Cassette Mechanism Deck (CMAL1Z240A) SERVICE POSITION OF THE AMP BOARD AMP board...

  • Page 6: General

    CX-LEM550 SECTION 2 This section is extracted from instruction manual. GENERAL List of button locations and reference pages How to use this page Illustration number Use this page to find the location of buttons and other DISPLAY wa (14, 21) parts of the system that are mentioned in the text.
  • Page 7 CX-LEM550 Remote control ALPHABETICAL ORDER BUTTON DESCRIPTIONS ?/1 (power) 1 (7, 19, 20, 25) A – O P – Z m/M (rewind/fast forward) ALBUM +/– qa (10, 11, 16) PLAY MODE qk (9, 11, 24) 7 (10, 15) CD qh (9, 11) REPEAT 4 (10) ./>...

  • Page 8: Disassembly

    CX-LEM550 SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. REAR CABINET (Page 8) 3-2. TOP PANEL ASSY (Page 9) 3-3. FRONT PANEL ASSY 3-4. BASE UNIT (Page 9) (BU-K7BD81B) (Page 10) 3-5. TAPE CASSETTE 3-6.

  • Page 9: Top Panel Assy

    CX-LEM550 3-2. TOP PANEL ASSY 6 top panel assy 5 connector (S820) 4 wire (flat type) (27 core) (CN305) 2 claw 1 claw 3-3. FRONT PANEL ASSY 2 wire (flat type) (16 core) (CN303) q; wire (flat type) (11 core)

  • Page 10: Base Unit (Bu-K7Bd81B)

    CX-LEM550 3-4. BASE UNIT (BU-K7BD81B) 8 base unit (BU-K7BD81B) 5 two washers 7 two washers 4 two screws 6 two screws 3 wire (flat type) (27core) (CN201) 2 CD cover 1 three screws (BTP2.6 × 8) 3-5. TAPE CASSETTE MECHANISM DECK...

  • Page 11: Main Board

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

  • Page 12: Test Mode

    A20 CE2 distination (In this case, UK model) model name (In this case, CX-LEM550) 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.

  • Page 13: Mechanical Adjustments

    CX-LEM550 SECTION 5 SECTION 6 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS TAPE MECHANISM DECK SECTION DECK SECTION 0 dB = 0.775 V Precaution 1. Clean the following parts with a denatured alcohol-moistened Precaution swab: 1. Demagnetize the record/playback head with a head demagne- record/playback heads pinch rollers tizer.

  • Page 14: Cd Section

    CX-LEM550 FOCUS BIAS CHECK 3. Mode: Playback oscilloscope (DC range) MAIN board CD board SPEAKER terminal (J302) test tape L-CH P-4-A100 oscilloscope TP (RFACO) (10 kHz, – 10 dB) TP (VC) – L-CH Procedure : 1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the CD board.

  • Page 15: Diagrams

    CX-LEM550 SECTION 7 DIAGRAMS THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. • Circuit Boards Location (In addition to this, the necessary note is printed in each block.) For Schematic Diagrams. For Printed Wiring Boards. Note: Note: •...

  • Page 16: Block Diagram - Cd Servo Section

    CX-LEM550 7-1. BLOCK DIAGRAM — CD SERVO SECTION — FILTER XTSL CD DSP XTAO IC101 (1/2) CLOCK X171 51 53 50 52 DETECTOR D +3.3V XTAI GENERATOR 16.9344MHz XTACN RFACO RFACI AOUT1 RFAC ASYMMETRY MAIN SUMMING DIGITAL PLL CORRECTOR DEMODULATOR...

  • Page 17: Main Section

    CX-LEM550 — MAIN SECTION — POWER J303 19 AUX-L IC501 R-CH OUT-L +INA OUTA J301 PHONES CD SERVO 21 CD-L Section R-CH +INB OUTB • R-ch is omitted due to same as L-ch. FM/AM TUNER PACK • Signal Path FM 75Ω...

  • Page 18: Printed Wiring Board - Cd Board

    CX-LEM550 • See page 15 for Circuit Boards Location. 7-2. PRINTED WIRING BOARD — CD BOARD — :Uses unleaded solder. CD BOARD (COMPONENT SIDE) M101 (SPINDLE) CD BOARD (CONDUCTOR SIDE) IC303 C302 S101 (LIMIT) C305 C303 C255 R404 C260 R313...

  • Page 19: Schematic Diagram - Cd Board

    CX-LEM550 7-3. SCHEMATIC DIAGRAM — CD BOARD — • See page 28 for Waveforms. • See page 28 to 30 for IC Block diagrams. C131 100p TP423 IOP1 C142 1500p C134 C125 R131 R121 R143 C151 TP10 R203 C143 3.3k...

  • Page 20: Printed Wiring Board - Main Board

    CX-LEM550 • See page 15 for Circuit Boards Location. 7-4. PRINTED WIRING BOARD — MAIN BOARD — :Uses unleaded solder. CONTROL BOARD BOARD BOARD CN201 CN303 CN308 (Page 18) (Page 24) (Page 22) MAIN BOARD • Semiconductor Location Ref. No.

  • Page 21: Schematic Diagram - Main Board

    CX-LEM550 7-5. SCHEMATIC DIAGRAM — MAIN BOARD — • See page 28 for Waveforms. • See page 31 for IC Block diagram. AMP BOARD MAIN BOARD CN308 (Page 23) SPEAKER Q349, 350 IMPEPANCE FAN MOTOR DRIVE USE 6-16Ω KTC3199GR-TP 1SS133T-77...

  • Page 22: Printed Wiring Board - Amp Section

    CX-LEM550 • See page 15 for Circuit Boards Location. 7-6. PRINTED WIRING BOARD — AMP SECTION — :Uses unleaded solder. MAIN BOARD MAIN BOARD CNB307 CNB308 AMP BOARD (Page 20) (Page 20) HP BOARD M301 (FAN) IC305 MAIN BOARD CN501B...

  • Page 23: Schematic Diagram - Amp Section

    CX-LEM550 7-7. SCHEMATIC DIAGRAM — AMP SECTION — AMP BOARD HP BOARD PHONES MAIN BOARD CNB308 (Page 21) 1SS133T-77 MAIN BOARD 1SS133T-77 CN501B (Page 21) M301 24.5 (FAN) -24.4 24.5 MAIN BOARD CNB307 IC501 (Page 21) 10.0 19.1 IC305 POWER AMP...

  • Page 24: Printed Wiring Board - Control Board

    CX-LEM550 • See page 15 for Circuit Boards Location. 7-8. PRINTED WIRING BOARD — CONTROL BOARD — :Uses unleaded solder. CONTROL BOARD • Semiconductor Location Ref. No. Location D801 D803 D807 D808 D809 D810 D811 D812 D813 BASS/ (EXCEPT AEP, UK)

  • Page 25: Schematic Diagram - Control Board

    CX-LEM550 7-9. SCHEMATIC DIAGRAM — CONTROL BOARD — • See page 28 for Waveforms. • See page 32 for IC Pin Function Description. CONTROL BOARD FLUORESCENT INDICATOR TUBE IC802 RPM7240-H4 REMOTE CONTROL S820 RECEIVER (OPEN) RD5.1ESB2 MAIN BOARD (Page 21)

  • Page 26: Printed Wiring Board - Power Board

    CX-LEM550 • See page 15 for Circuit Boards Location. 7-10. PRINTED WIRING BOARD — POWER BOARD — :Uses unleaded solder. MAIN BOARD CNB903 (AC IN) POWER BOARD (Page 20) • Semiconductor Location Ref. No. Location D905 D906 D907 D908 (SP, E51)

  • Page 27: Schematic Diagram - Power Board

    CX-LEM550 7-11. SCHEMATIC DIAGRAM — POWER BOARD — POWER BOARD MAIN POWER Not replaceable : TRANSFORMER Built in transformer S901 (SP, E51) (SP, E51) VOLTAGE SELECTOR (SP, E51) 110-120V 1SS133T-77 220-240V 1SS133T-77 MAIN BOARD CN901 (AEP, UK, KR) (AEP, UK, KR)
  • Page 28 CX-LEM550 • IC Block Diagrams • Waveforms – CD Board – – MAIN Board – – CONTROL Board – – CD Board – IC101 yd (LRCK) Q344 collector IC801 qd (O-XT2) (REC mode) IC101 CXD3059AR 4.4 Vp-p 3.4 Vp-p 12.4 Vp-p 22.8 µ...
  • Page 29 CX-LEM550 IC251 BA5947FM MUTING + – INTERFACE LEVEL SHIFT INTERFACE INTERFACE VREF IC303 BH15FB1WG THERMAL PROTECTION OVER CURRENT PROTECTION VOLTAGE CONTROL REFERENCE BLOCK...
  • Page 30 CX-LEM550 IC301 TC94A34FG-002 Timing Generator VDDP PO5/AD5 /RESET PO6/AD6 STANDBY PO7AD7 /MICS /MILP MIDIO AD10 /MICK VDDT /MIACK/ SRMSTB AD16 VDDT VDDM PO8/AD11 SDO0 PO9/AD12 /CCE/ PO10/ BCKO AD13 BUCK/ PO11/ LRCKO AD14 SDO3/ SDI0 Interrupt Timer Control Switch General...
  • Page 31 CX-LEM550 – MAIN Board – IC302 BD3881FV BASS BASS VOLUME TREBLE LOGIC CONTROL VOLUME TREBLE...
  • Page 32 CX-LEM550 • IC Pin Function Description • CONTROL BOARD IC801 LC876980B-52T4-E (SYSTEM CONTROLLER) Pin No. Pin Name Description MI-ACK Acknowledge signal input from the MP3 decoder MP3-RST Reset signal output to the MP3 decoder MP3-REQ Request signal input from the MP3 decoder...
  • Page 33 CX-LEM550 Pin No. Pin Name Description TU CE Chip enable signal output to the FM/AM tuner unit TU CLOCK Serial data transfer clock signal output to the FM/AM tuner unit TU DI Serial data input from the FM/AM tuner unit...

  • Page 34: Exploded Views

    CX-LEM550 SECTION 8 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Abbreviation The components identified by mark 0 or may have some difference from the original : Chilean and peruvian models dotted line with mark 0 are critical for safety.

  • Page 35: Front Panel Assy-1

    CX-LEM550 8-2. FRONT PANEL ASSY-1 not supplied not supplied not supplied not supplied not supplied (HP board) front panel assy-2 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-242-079-01 KNOB (RTRY VOL) A-4752-932-A CONTROL BOARD, COMPLETE (E51)

  • Page 36: Front Panel Assy-2

    CX-LEM550 8-3. FRONT PANEL ASSY-2 not supplied not supplied not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-2021-358-1 LID CASS ASSY (X) (BLACK) X-4956-461-1 FRONT PANEL ASSY (X) (SILVER)(SP, E51, KR) X-4956-362-1 LID, CASS ASSY (X) (SILVER)

  • Page 37: Top Panel Assy

    CX-LEM550 8-4. TOP PANEL ASSY S820 not supplied not supplied not supplied S101 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark not supplied 4-246-194-21 CHASSIS, CD (EXCEPT BLACK) 4-247-493-01 COVER, CD 4-246-194-41 CHASSIS, CD (BLACK) 3-931-379-31 RUBBER, VIBRATION PROOF (GREEN)

  • Page 38: Electrical Parts List

    CX-LEM550 SECTION 9 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they When indicating parts by reference number, parts list may be different from the parts are seldom required for routine service.
  • Page 39 CX-LEM550 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C125 1-164-360-11 CERAMIC CHIP 0.1uF < CONNECTOR > C131 1-162-927-11 CERAMIC CHIP 100PF C132 1-117-863-11 CERAMIC CHIP 0.47uF 6.3V CN101 1-770-425-11 CONNECTOR, FFC/FPC 16P C133 1-162-970-11 CERAMIC CHIP 0.01uF...
  • Page 40 CX-LEM550 CONTROL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R313 1-216-813-11 METAL CHIP 1/10W C841 1-162-960-11 CERAMIC CHIP 220PF C842 1-162-964-11 CERAMIC CHIP 0.001uF R351 1-216-809-11 METAL CHIP 1/10W R352 1-216-809-11 METAL CHIP 1/10W < CONNECTOR >...
  • Page 41 CX-LEM550 CONTROL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q807 8-729-054-16 TRANSISTOR KRC402-RTK R855 1-216-837-11 METAL CHIP 1/10W Q808 8-729-054-16 TRANSISTOR KRC402-RTK R856 1-216-833-11 METAL CHIP 1/10W < RESISTOR > R857 1-216-809-11 METAL CHIP 1/10W...
  • Page 42 CX-LEM550 CONTROL MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark RP01 1-216-845-11 METAL CHIP 100K 1/10W < FERRITE BEAD > RP02 1-216-845-11 METAL CHIP 100K 1/10W RP03 1-216-845-11 METAL CHIP 100K 1/10W FB501 1-410-396-41 FERRITE 0.45uH...
  • Page 43 CX-LEM550 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C227 1-162-962-11 CERAMIC CHIP 470PF < CONNECTOR > C232 1-126-963-11 ELECT 4.7uF C233 1-130-492-11 MYLAR 0.056uF * CN301 1-564-709-11 PIN, CONNECTOR (SMALL TYPE) 7P * CN302...
  • Page 44 CX-LEM550 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JUMPER RESISTOR > R117 1-216-825-11 METAL CHIP 2.2K 1/10W R118 1-216-829-11 METAL CHIP 4.7K 1/10W JW323 1-410-509-11 INDUCTOR 10uH R119 1-216-823-11 METAL CHIP 1.5K 1/10W...
  • Page 45 CX-LEM550 MAIN POWER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R319 1-216-857-11 METAL CHIP 1/10W A-1059-097-A POWER BOARD, COMPLETE (KR) R320 1-216-829-11 METAL CHIP 4.7K 1/10W A-4752-018-A POWER BOARD, COMPLETE (SP, E51) R321 1-216-845-11 METAL CHIP...
  • Page 46 CX-LEM550 POWER Ref. No. Part No. Description Remark < RELAY > 0 RY901 1-755-276-11 RELAY, POWER < SWITCH > 0 S901 1-571-309-11 SWITCH (VOLTAGE SELECTOR)(SP, E51) < TRANSFORMER > 0 T901 1-443-410-11 TRANSFORMER, POWER (AEP, UK, KR) 0 T901 1-443-412-11 TRANSFORMER, POWER (SP, E51)
  • Page 47 CX-LEM550 MEMO...
  • Page 48 CX-LEM550 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision...

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