Sony CX-LEM550 / XR-EM550 Service Manual ▷ View online
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
CD Section ...................................................................... 14
7.
DIAGRAMS
7-1.
Block Diagram – CD Servo Section – ............................ 16
– MAIN Section – ........................................................... 17
– 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
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
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.
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.
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
CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.
that the S curve waveforms is output three times.
MODEL IDENTIFICATION
– Back Panel –
– 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
5
CX-LEM550
SERVICE POSITION OF THE TAPE CASSETTE MECHANISM DECK
SERVICE POSITION OF THE AMP BOARD
Tape Cassette Mechanism Deck
(CMAL1Z240A)
(CMAL1Z240A)
AMP board
6
CX-LEM550
SECTION 2
GENERAL
This section is extracted
from instruction manual.
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)
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)
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/
.m/M> (skip back/
skip forward, rewind/fast
forward) qh (10, 11, 15)
forward) qh (10, 11, 15)
x (stop) 7 (10, 16, 17, 25)
z REC PAUSE/START qs (16,
z REC 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.
parts of the system that are mentioned in the text.
Illustration number
r
DISPLAY
wa (14, 21)
R
R
Name of button/part
Reference page
ALPHABETICAL ORDER
A – O
P – Z
BUTTON DESCRIPTIONS
1
2
3 4
5
6
7
8
9
qa
0
qs
qd
qf
qg
qh
qj
qk
w;
ql