CX-LEM550, XR-EM550 — Sony Car Audio Service Manual (repair manual)

Model
CX-LEM550 XR-EM550
Pages
48
Size
3.24 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cx-lem550-xr-em550.pdf
Date

View Sony CX-LEM550 / XR-EM550 Service Manual online

SERVICE MANUAL
Sony Corporation
Personal Audio Division
Published by Sony Techno Create Corporation
AEP Model
UK Model
E Model
COMPACT DISC DECK RECEIVER
9-877-819-02
2007F16-1
© 2007.06
Ver. 1.1  2007.06
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,
Tape Deck and Tuner section in 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 V or 220 – 240 V 
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  
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in 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.
EXPLODED VIEWS
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
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.
MODEL  IDENTIFICATION
– Back Panel –
Model Name
Power Voltage 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
Page of 48
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Here you can view online or download Sony CX-LEM550 / XR-EM550 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CX-LEM550 / XR-EM550 Car Audio. Information contained in Sony CX-LEM550 / XR-EM550 service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).