Sony CDP-M72 User manual

CDP-M72
SERVICE
MANUAL
AEP
Model
UK Model
E Model
Modei Name Using Similar Mechanism | CDP-M71
CD Mechanism Type CDM14-5BD1
BU-5BD1
TABLE
OF
CONTENTS
SPECIFICATIONS
Section
Title
Page
Outputs
DIGITAL
OUT
Wave
length
660
nm
(OPTICAL)
Output
level
-
18
dBm
1.
GENERAL
pele
Location
of
Controls
.........:ccccssesscccessserensereteeessssansenee
4
General
Power requirements Model for Continental Europe
220 V - 230 V AC, 50/60 Hz
2, ELECTRICAL BLOCK CHECKING ............ 5 Mode fot the United Kingdom
Model for other countries
110 - 120 V/220 - 240 V
50/60 Hz
Power consumption 12W
3. DIAGRAMS
1. BIOCK Diagram ...sssssssscscssssssssrsssssssceceeseceeeteee 7 “operon ncludig (w/a (hax vor 12/ches
3-2.
Semiconductor
Lead
Layouts
..........sseceeeee
11
iia
sae
eos
3-3.
Printed
Wiring
Boards
...........ssssesererereceseseees
12
eT
mes
3-4. Schematic Diagram ........ccccseeseeecneeeeeees 15 pep apesaeh
lor some areas,
3-5. IC Block Diagrams. ..........cscssessssesseseneesnees 19
F Design and specifications subject to change without notice.
3-6. Pin Functions of 10401 0... ee eecseeeeeeeenees 21
This Compact Disc player is
classified as a CLASS 1
4. EXPLODED VIEWS CLASS 1 LASER PRODUCT LASER product.
41, Chassis: Secton -azsniissinintantioaieloatacan 22 Gee VkAceeiPoe The CLASS 1 LASER
4-2.
CD
Mechanism
Section
...........-:ssccesseseeseeeeees
24
ee
be
is
located
F
:
t
extes
or.
4-3, Optical Pick-Up BIOCK ..sssssssesssssssstseeseene 25 poe ys
:
Ra
PARTS
LIST
scscsowscsseeeccensetvsies
26
C
0
Mi
PA
CT
D
|
§
C
p
L
AYE
R
=
SONY.

CDP-M72 |
PROTECTION
OF
EYES
FROM
LASER
BEAM
DURING
SERVICING
This set employs a laser. Therefore, be sure to follow carefully the
instructions below when servicing.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
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 sureface 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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
A\
OR
DOTTED
LINE
WITH
MARK
A\
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.
1. Laser Diode Properties
* Material: GaAlAs
* Wavelength: 780nm
¢ Emission Duration: continuous
¢ Laser Output: max.44.6.W*
* This output is the value measured at a distance of about
200mm from the objective lens surface on the Optical Pick-up
Block.
2. During service, donot take the Optical Pick-up Block apart, and
do not adjust the APC circuit. If there is a breakdown in the APC
circuit (including laser diode), replace the entire Optical Pick-
up Block (including APC board).
LASER DIODE AND FOCUS SERCH OPERATION
CHECK
1. Make POWER switch on with no disc inserted and disc table
closed.
2. Confirm that the following operation is performed while observ-
ing the objective lens.
@ Confirm that laser beam is spread.
e Up and down motion of the objective lens. (3 times)
A pstehiembeche aninatouboeneo6-atthe vs eae

| CDP-M72
MODEL IDENTIFICATION
- SPECIFICATION LABEL -
CDP-M72
SONY. MODEL NO. VLLLLLL
COMPACT DISC PLAYER
MMMM
UK
MODEL
Acz4OV,
S060,
12
E, Saudi Arabia MODEL: AC110-120, 220-240V, 50/60Hz, 12W
MADE IN JAPAN : Japan Made Model
MADE IN FRANCE : France Made Model

CDP-M72 |
LOCATION OF CONTROLS
[1] POWER switch
[2] Disc tray
REPEAT button:
[4] A. SPACE (auto space) button
[5] 4 OPEN/CLOSE button
[6] MUSIC SCAN button
PEAK SEARCH button
[8] FADER button
[9] EDIT/TIME FADE button
CONTINUE button and indicator
SHUFFLE button and indicator
PROGRAM button and indicator
SECTION 1
GENERAL
This section is extracted from
instruction manual.
{23} [22]
[21] (20) [r9}fsej17] [46 [15]
Numeric buttons
CLEAR (program clear) button
> 20 (over 20) button
CHECK (program check) button
<< BP (manual search) buttons
TIME SET button
[19] <4 & PI AMS") buttons
[20] @ (stop) button
Il (pause) button
> (play) button
[23] TIME button
Display window
* AMS is an abbreviation of Automatic Music Sensor.

| CDP-M72
SECTION 2
ELECTRICAL BLOCK CHECKING
Note :
1. CDBlock basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10OMQ impedance.
4. Clean an object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S Curve Check
oscilloscope
BD board
a“
TP (FEQ) ©
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FEO) on BD board.
2. Connect between test point TP (FES) and TP (VC) by lead wire.
3. Turned Power switch on and actuate the focus serch. (actuate
the focus serch when disc table is moving in and out.)
Check the oscilloscope waveform (S curve) is symmetrical
between A and B. And confirm peak to peak level within
341 Vp-p.
4.
S curve waveform symmetry
within 3£1Vp-p
5. After check, remove the lead wire connected in step 2.
Note: » Try to measure several times to make sure that the
ratio of A: B or B: A is more than 10: 7.
° Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
oscilloscope
BD board
a
TP (RFQ) ©
TP (VC) ©
Procedure :
1. Connect oscilloscope to test point TP (RFO) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note :
Clear RF signal waveform means that the shape “ 0” can be clearly
distinguished at the center of the waveform.
VOLT/DIV : 200mV
RF RY waveform TIME/DIV : 500nS
RY
NH
Ve )
ANY yy WN mee
WHINY | 12222 veer
E-F Balance Check
oscilloscope
BD board
TP (TEO) ©
TP (VC) ©
Procedure :
1. Connecttest point TP (ADJ) to ground and TP (TES)to TP(VC)
with lead wire. ;
Connect oscilloscope to test point TP (TEO) on BD board.
Turn Power switch on.
Put disc (YEDS-18) in and playback.
Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to OV, and check this level.
VPwh
Traverse oscilloscope
i I" |
symmetry
Level : 2£1Vp-p
6. Remove the lead wire connected in step 1.

CDP-M72 |
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (PLCK) with lead wire.
frequency counter
Main board
Comnestemen)
TP (PLCK)
2. Turn Power switch on.
3. Confirm that reading on frequency counter is 4.3218MHz.
Focus/Tracking Gain
This gain has a margin, so even if it is slightly off.
There is no problem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
ADJUSTMENT LOCATIONS
[ BD BOARD ] - Conductor Side -
[ MAIN BOARD ] - Component Side -
Hae RiaaMiienetin dete case

SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
1c
101
IC
301
xRST
(0)
FOCUS
/TRACKING/SLED
SERVO
DIGITAL
SIGNAL
PROCESSOR
EFM
COMPARATOR
aan
/
CLV
SERVO
SEIN
ee ome
| eed,
Rae
G!)
@!)
i m pe
J
KSS-240A
| OPTICAL PICK-UP BLOCK
X301
= 16.9344MHz
Q393
& BUFFER —
Q392
SWITCH
FLD DRIVE /
MASTER CONTROL
D-A, 8G-IG,P-E
TRACKING
COIL
ORIVE
LASER TRACKING
DIQOE coIL ©
C)
RESET SWITCH
; Q206 ZZ
S272 $271
Q204
LOAD
IN
LOAD
OUT
aOWER
L — a _I SWITCH
tone
eS
iss
LOADING
1C102
SPINDLE
MOTOR
19 FOr en DRIVE “ MOTOR FLD40!
SPINDLE/SLED
DRIVE
DISPLAY
45V
MOTOR DRIVE
$401 ~ 406,7
$408 ~ 410, 4.
S412~ 444
SLED MOTOR SPINDLE MOTOR $10!
MIOl M102 LIMIT FUNCTION MI9I
SWITCH SWITCH LOADING MOTOR

E, Saudi Arabia MODEL
IC391
DIGITAL
OUTPUT
DIGITAL OUT
OPTICAL
a
°o
=
oO
uw
a
uw
no
VOLTAGE
CN39!
O
Q392
SWITCH
AEP/UK MODEL
F
7
|
|
|
|
|
|
|
|
|
|
|
|
F
= 1C201 B30
(3) -30v REG (1)
(4)
Q206 Q205 D203 ~ 206
RESET SWITCH oo SWITCH
ON /OFF
© © PS202
Q204
4
18202
on
see
POWER pO~o; SS
SWITCH 5V REG T901
POWER TRANSFORMER
‘ ((4)
$491 i +5V Q203
+5V REG
Q207,208
O00 0
AC IN

3-2.
SEMICONDUCTOR
LEAD
LAYOUTS
DTA144ES
DTC114ES
DTC144ES
2SC2458-YGR
x it
E
Cc 8B
DTC144EK
c
Sz:
2SA1175-HFE
I
ef
2SA933S-OR
I
c B
2SB1274-RS
2SB1274SA-Q
mi
i
8
c E
RD4.7M-B1
cathode
| anode
RD6.8ES-B2
RD7.5JS-B2
RD9.1ES-B2
1SS120
11ES2
athode
anode
@ SEMICONDUCTOR LOCATION
* o——-: indicated a lead wire mounted on the component side.
: parts mounted on the conductor side.
: Through hole.
: Pattern from the side which enables seeing.
1: Pattern of the rear side.
: Saudi Arabia Model
3-3. PRINTED WIRING BOARDS
|
DIGITAL
ouT
{ MAIN BOARD ) (_ertca
CN:
(CHASS|
(CHAS SIS)
(CHI
19 ASSIS)
POWER
TRANS FORMER
VOLTAGE SELECT] szo1 |
15 V i> 230)
T901
% NOT REPLACEABLE : BUILT IN
oj a2(3

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|
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2
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|
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OTtiOSSC‘éSCT
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if
18
|
19
[
20r-
=
3
21
|
[
BD
BOARD
}
[
LOADING
BOARD
]
(
n
oz
ri
i
1-632-202
-
OPTICAL
PICK
—UP
BLOCK
=
KSS-
240A
7]
|
7
|
a
M194
i
|
=>
LOADING
=|
y
Load
OUT
2
md
S
AC
IN
Os
=
P/UK
caine
jODEL
:
_
as
:
|
A
Peer
erate
TRANSFORMER
ree
20090000)
|
FLD
401
t
[
TRACK
STEP
INDEX
PEAK
MIN
DISC
SEC
1
bee
Powe
6
Hoan
88
88-88.
BB
1
-
-
- 2
-
.
:
|
°
|
|
EDIT
TIME
ie
SHUFFLE
0
PROGRAM
QMULT1)
an
FADE
.
AUTOSPACE
REPEAT
1
A-B
D>
1
cai
|
.
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BOARD
]
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