Sony CDP-791 User manual

CDP-791/X111ES
SERVICE MANUAL
SPECIFICATIONS
Compact disc player
Frequency response
Signal-to-notse ratio
Dynamic range
Harmonic distortion
Channel separation
Outputs
LINE OUT (FIXED)
(phono jacks)
LINE OUT
(VARIABLE)
(phono jacks)
DIGITAL OUT
(OPTICAL)
(optical output
connector)
PHONES
(stereo phone jack)
General
Power requirements
MICROFILM
2 Hz - 20 kHz + 0.5dB
More than 108 dB
More than 98 dB
Less than 0.0027%
More than 100 dB
Output level 2 V (at 50 kilohms)
Load impedance over 10 kilohms
Output level max. 2 V (at 50 kilohms)
Load impedance over 50 kilohms
Wave length 660 nm
Output fevel — 18 dBm
Output level max. 10 mW
Load impedance 32 ohms
US, Canadian Modei:
120 V AC, 60 Hz
AEP Model:
220 V — 230 V AC, 50/60 Hz
UK Model:
240 V AC, 50 Hz
US Model
Canadian Model
CDP-X111ES
AEP Model
UK Model
CDP-791
Photo: CDP-791
Model Name Using Similar Mechanism | CDP-291/391
CDM14-5BD1
Optcal Pick-Up Block Type BU-5BD1
CD Mechanism Type
Power consumption. 12W
Dimensions {approx., 430110280 mm (w/h/d)
including projections) (1747/4 11'/e inches)
Weight (approx.) 4.0 kg (8 Ibs 14 07)
Supplied accessories
Audio
cord
1
(2 phono plugs - 2 phono plugs)
Remote commander 1
R6 (AA) batteries 2
Remote commander RM-D791
Remote control
sysiem
Infrared contro!
Power requirements 3 VDC with two R6 (size AA) batteries
Dimensions Approx. 62 X 20 X 175 mm (w/h/d)
(1°/5X °/i6X 7 inches)
Weight Approx. 130 g (4.6 02)
Including batteries
Design and specifications subject to change without notice.
COMPACT DISC PLAYER
SONY.

CDP-791/X111ES
SAFETY CHECK-OUT
After
correcting
the
original
service
problem,
perform
the
following
safety
check
before
releasing
the
set
to
the
customer:
Check
the
antenna
terminals,
metal
trim,
“metallized”
knobs,
screws,
and
all
other
exposed
metal
parts
for
AC
leakage.
Check
leakage
as
described
below.
LEAKAGE TEST
The
AC
leakage
from
any
exposed
metal
part
to
earth
ground
and
from
all
exposed
metal
parts
to
any
.
exposed
metal
part
having
a
return
to
chassis,
must
not
exceed
0.5mA
(500
microampers).
Leakage
current
can
be
measured
by
any
one
of
three
methods.
1.
A
commercial
leakage
tester,
such
as
the
Simpson
229
or
RCA
WT-540A.
Follow
the
manufacturers’
instructions
to
use
these
instru-
ments.
2.
<A
battery-operated
AC
milliammeter.
The
Data
Precision
245
digital
multimeter
is
suitable
for
this
job.
3.
Measuring
the
voltage
drop
across
a
resistor
by
means
of
a
VOM
or
battery-operated
AC
volt-
meter.
The
“limit”
indication
is
0.75
V,
so
analog
meters
must
have
an
accurate
low-
voltage
scale.
The
Simpson
250
and
Sanwa
SH-63Trd
are
examples
of
a
passive
VOM
that
is
suitable.
Nearly
all
battery
operated
digital
muitimeters
that
have
a
2V
AC
range
are
suitable.
(See
Fig.
A)
To Exposed Metal
Parts on Set
AC
voltmeter
aie (0.75 V}
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
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 PUB-
‘LISHED BY SONY. | |
MODEL IDENTIFICATION
i-) i CDP-791
—Model Number Label—
CDP-X111ES
MODEL NO.WYyyy7Z
SERIAL No.
MMMM
MADE IN JAPAN
MADE IN FRANCE
US Model: = AC120V 60Hz12W
Canadian Model: AC: 120V 60 Hz 12W
_ AEP Model: =. AC220 — 230V, 50/60Hz
UK Model: AC240V~50/ 60Hz
TABLE OF CONTENTS
Section Title Page
Specifications wt Te ve ere eee eee ee ee ee ee ee ee 1
Safety Check-out Cee ee emcee seer enseseeeeenusenen 2
Model Identification «reece s reece versace cccenvece 2
1. GENERAL
Notes on Handling the Optical Pick-up
Block or Base Unit --es sec c reeset cece nenes 3
Notes on Laser Diode Emission Check ---:--: 3
Location of Controls CTCL ere ee eee ee re a ee 3
Adjusting Operating Voltage --:---+++++++++> 3
2. DISASSEMBLY Teor eT ee Tee ee | 4
3. ELECTRICAL BLOCK CHECKING
S Curve Check ee ree ee eae ee Et enneaw ie 5
RF Level Check --crcsccccrcerceecnecccens 5
E-F Balance Check Cece eee w ere nen seas aneve 5
RF PLL Free-run Frequency Check ---++--::> 6
Focus/T racking Gain ee ee ee ee ee ee ee 6
4. DIAGRAMS
1C101(CXA1372Q)PIN DESCRIPTIONS -::+ 7
4-], . Block Diagram gee wa eee 8 -le'ee ae eb eee & ete wl ecere 8
4-2. Printed Wiring Boards cee een ere em eee en eeene 12
4-3, Schematic Diagram a ee 1S
5. EXPLODED VIEWS et Skea ents ee ew eae 21
6. ELECTRICAL PARTS LIST ----::-:----: 24
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE. FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

CDP-791/X111ES
NOTES ON HANDLING THE OPTICAL PICK-UP For UK Model and AEP Model
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer CLASS 1 LASER PRODUCT
electrostatic breakdown because of the potential di- ee
Dp KLASS 1 LASERAPPARAT
ference generated by the charged electrostatic load,
etc. on clothing and the human body.
During repair, pay attention to electrostatic break-
This Compact Disc player is classified as a
CLASS 1 LASER product.
down and also use the procedure in the printed matter The CLASS 4 LASER PRODUCT label is located
which is included in the repair parts. on the rear exterior.
The flexible board is easily damaged and should be ee —
hadicdwithGare- PNohTUL) Cale m Ql elec Liem gedit lets
For the customers of the model equipped
NOTES ON LASER DIODE EMISSION CHECK | with the voltage Sieie: | ee
The laser beam on this model is concentrated so as to Check that the voltage selector is set to the
be focused on the disc reflective surface by the objec- loca! power line voltage. If not, set the selector
tive lens in the optical pick-up. block. Therefore, when to the correct position before connecting AC
checking the laser diode emission, observe from more Power corcite:dwallOuNel
than 30cm away from the objective lens.
110-120'V 220-240 V
Ge
ae
mien
SECTION 1
instruction manual. GENERAL
This section is extracted from
Location of Controls
Front Panel
ae LZ] 3.5 4.54 6°
rn
calurfusfan yes if
a
oa enter Se et Ee
2B} 27! 26 (25, 24) 123.22 2117 201.19' 1817; 1615.
POWER switch @ [16] PHONES jack
Disc tray ® MUSIC SCAN button @
& OPEN/CLOSE bulton © (18) <<» (manual search) buttons @, @
[4] PEAK SEARCH button @ [191 FADER button @ @
CONTINUE button and indicator ©. @. @. @. @ (20) <4 BPE (AMS’*) bulions @. @
(6 } SHUFFLE button and indicator @ TIME button ©
PROGRAM button and indicator @, © (22| A. SPACE (auto space)/A. CUE(auto cue) bution and auto cue
TIME SET button @, @ indicator @, @
[9 | EDIT/TIME FADE button ©, ® (23] @ (stop) button &@
Numeric buttons @ EU (pause) button @
[41]
REPEAT
button
©
[251
&
(play)
button
@
42} >20 (over 20) button @ {26| Display window
[13}
CHECK
(program
check)
button
@,
@
[27]
TIMER
switch
©
CLEAR
(program
clear)
button
©, @.
@
[28!}
Remote
sensor
@
[15] LINE OUT/PHONE LEVEL control @&
—~—3—

CDP-791/X11T1ES |
atztarelc=meote)nilaet-ale\s) a
ae
“2;
(1)
&
OPEN/CLOSE
button
®
=
{2
|
SHUFFLE
button
@
ee
|
3]
PROGRAM
button
©.
@
[4] M.SCAN (music scan) button ®
LS] Numeric buttons @
sj {6} CLEAR (program clear) button @. @. @
6!
N f
'
i
i ?_} CHECK button @, ®
[8 } A <— B repeat button @
ae 1.9] A.SPACE (auto space)/A.CUE (auto cue) button @, @
8! '10] FADER button @, @
‘11] @ (stop) button @
9 [12] LINE OUT LEVEL +/ -- (line out/headphone volume)
10:
buttons
@
|
113] << BE SLOW (low speed manual search) buttons @
-E! [14] << BP (manual search) buttons @. @
ig: 15] 4— —& INDEX buttons @
AWS:
13}
[16]
<4
BE
AMS
buttons
@,
@
1G erenetmer , [17] 88 (pause) button @
|
ey a . iO {O
ee
rea) 6/8 A[8/
aA By
rer
|
SrA
re]
119] CLEAR/REPEAT (A <> B repeat clear/repeat) button @
'20] TIME button @
[21] 20 (over 20) button @
[22] CONTINUE button @, @. @. @ ®
SECTION 2
DISASSEMBLY
BASE UNIT REMOVAL
Note: Follow the disassembly procedure in the numerical order given.
i, Remove CD mechanism from the set and turn over.
2, Turn the cam @inthe Arrow @ direction by the O driver.
3. Take out disc table Qa.
4
5
Base Unit
. Remove bracket yoke ©. BU-5BD1
. Remove BU-5BD1 @ in the Arrow © direction.
disc table @
—4—

SECTION 3
ELECTRICAL BLOCK CHECKING
Note:
1. CD Block basically constructed to operate with-
out 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 10MS2 im-
pedance.
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
TP (FEO) omw—o}
TP(vC) ow—to-
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.)
4. Check the oscilloscope waveform (S curve) is
symmetrical between A and B. And confirm peak
to peak level within 3+1Vp-p.
S curve waveform symmetry
/]
as + within 3£1Vp-p
5. After check, remove the lead wire connected in
step 2.
Note: « Try to mesure 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
a
TP (RF) O=t———o+
TP (Vc) omw—tlo-
BD board
Procedure :
1. Connect oscilloscope to test point TP (RF) on
BD board.
2. Turn Power switch on.
Put dise (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 “©”
can be clearly distinguished at the center of the wave-
form.
VOLT/DIV : 200mV
TIME/DIV. : 500nS
\AAAAAAAAAAA)
\ i a
WIN | 2402 vp
AANA ii me
RF signal waveform
r
E-F Balance Check
oscilloscope
BD board
| eR.
TP (TEO) Ow—o}
TP(vc) ow—lo-
Procedure :
1. Connect test point TP (ADJ) to ground and TP
(TES) to TP (VC) with lead wire.
2. Connect oscilloscope to test point TP (TEO) on
BD board.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and playback.
Confirm that the osilloscope waveform is sym-
metrical on the top and bottom in relation to OV,
and check this level.
Traverse oscilloscope
symmetry
level: 2+1Vp-p
6. Remove the lead wire connected in step 1.
CDP-791/X1TT1ES

CDP-791/X111ES
RF PLL Free-run Frequency Check Adjustment Locations :
Procedure : {BD board)
1. Connect frequency counter to test point (PCIC)
with lead wire.
~— conductor side —
Main
board
frequency
counter
Fi omar |
TP (PCK) oe:
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 cen-
ter position when you moved and do not know
original position.
(Main board)
= Component Side —

[C101 (CXA1372Q) PIN DESCRIPTIONS
PIN NO. PIN NAME FUNCTION |
— ge
=~ Beorran sg wn
— tt te on & Ww Nh
VC
FGD
FS3
FLB
FEO
FE=
SRCH
TGU
TG2
AV CC
TAO
TAS
SL+
SLO
2L=
FSET
ISET
SSTOP
AV EE
DIRC
LOCK
CLK
XLT
DATA
SENS
XRST
C, OUT
D GND
MIRR
DFCT
ASY
EFM
FOK
CC2
CCl
DV CC
CB
CP
RFI
RFO
DV EE
TZC
TE
TDFCT
ATSC
FZC
FE
FDFCT
Ne a OD oe es
O- CO mm et em
OoO- 00-900
—Ps Ft ee ke OO OE
SECTION 4
DIAGRAMS
2.5 Volts power supply.
Focus gain adjusting capacitor connected between @ pin and @ pin.
Focus gain adjusting capacitor connected between @ pin and @ pin.
Focus Servo low frequency boost-up capacitor connected,
Focus drive output.
Focus error amp inverted input,
Connected capacitor to making the focus serch waveform,
Tracking gain adjusting capacitor connected between pin and @) pin.
Tracking gain adjusting capacitor connected between pin and ©) pin.
+5 Volts power supply.
Tracking drive output.
Tracking amp inverted input,
Sfed amp non-inverted input.
Sled drive output.
Sled amp non-inverted input,
Phase stabilizer setting resistor connected,
Current setting resistor connected.
Limit switch connection port,
Ground (OV),
Direct control port, Non-connected,
Sled free-run protection is operate at “L”.
Serial data transmission clock input form digital signal processor,
Latch input from digital signal processor,
Serial input from digital signal processor.
Outputs internal state corresponding to address.
System reset input. Reset at “L”,
Tracking counter output,
Digitel ground, Grounded
Mirror output digital signal processor.
Deffect output. Deffect at “H”",
Auto symmetry control input.
EFM Comparator output,
Focus OK,
Deffect bottom hold input.
Deffect bottom hold output.
+5 Volts power supply,
Deffect bottom hold capacitor connected.
Mirror hold capacitor connected,
RF Signal input (Capacitance coupled).
RF Signal input (Direct Coupled),
Grounded (OV).
Tracking Zero-cross comparator input,
Tracking error amp input.
Deffect correction hold capacitor connected,
Anti-shock input.
Focus Zero-cross comparator input,
Focus error input,
Deffect correction hold capacitor connected,

e Circuit Boards Location
OPTICAL PICK UP BOARD
POWER SWITCH BOARD
eS
KEY BOARD
DISPLEY BOARD
e Semiconductor Location
Note:
® O—— : parts extracted from the component side.
6 | : parts mounted on the conductor side.
BD BOARD
MAIN BOARD
ya
——=— MOTOR (VR) BOARD
eHP BOARD

e IC Block Diagram
1C301
IC101 CXA1372Q
3 - “ x > DE 2 oo6 o
2 88 & tb @ &S & Ho &
(36) (35) (3) 3) (32) 313023} 2) oe (25)
COMPARATOR OMPARATOR BUFFER
DATA
cB (37) AUTO AS 5} Pa 5) nee
cP (38) AMP LL? CLK
4 i.
RFI (39) VtL ao Lock
RFO
DFcY 8) DIRC
COMPARATOR
(19) AVEE
BVEE (41)
Tee
ae ee ee
COUPARATORE 418) SSTOP
FSI-4 TO1,2 TuI-7 PSI-3 4
TQ)
TE Fet 1. QAIN
e
2
Dre
pny
cae
TaceNa
(7)
ISET
* a _ ee ee We-
TDF CT wf > ae 1 Bayo cowry a | F SET --—{is) FSET
aTsc (iS)—ofB.P.F}-*\ cqupakatony Tg \ 1. BRAKE S
‘*ti-""
10 ~~ offaar a rshene >= S
4 re) uP /DOWN (8) sL-
FE
(at)
=
pret
pown/NORUAt
1
S
:
Lr
|
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(12) TESTS
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IC403 74HC175

of this parts list. Ne les remplacer que par une
(1)
CHASSIS
SECTION
>
16
piéce
portant
le
neméro
spécifié.
18
we
19
YT
not supplied &
#7
te = = J
Not supplied
45 supplied with VR
supplied with J481 not supplied