Sony WM-EX50 User manual

WM-EX90/FX90
SERVICE MANUAL
WM-EX50
TABLE OF CONTENTS
GENERAL: . westecsstinpiessiniiocntetcncetasanueiaenenaarmnes 2- 6
Messages, warnings and tipS.........ccsssccccessessseeeeeees 2
Test equipment, Jigs and material .................006 3
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Location and function of controls ...................0ee 4
User’s instruction (WM-EX50 only) .............. 5- 6
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LCD BLOCK INFORMATION(WM-EX50 only).... 8
Data code chart and indication mode ................. 8
BLOCK. DIAGRAMS xeiisssct sasccnssmunsacchietearlinss ees 9-10
SCHEMATICS AND BOARD DIAGRAMS ....... 11-19
Semiconductor layouts ...........cccccsssssssecceeeeeeeeeeenes 14
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SPARE PARTS LIB DE ncdGuteecokecetitiaiacs 20-28
Exploded views and mechanical parts............ 20-22
Electrical parts cctusctascnctiicenitiaciintivacewsn 23-28
ADUOSTIMERINGS: sites. dsSieoessaints ceuurelstecbentetedecaines 29-32
Mechanical measurements ...........ceeeeeseeeeeeeeeeneeees 29
Mechanical adjustments ...............ceeeeeeeseseeneeeeeeeeee 29
Electrical alignments ........cccesscceseeeeeeeeeeeetees 30-32
Adjustment location s...cicccccicccasscnvsessicnorersseness 29-30
SPECIE IC A TIONS s.fius pe coccedecteadeceeccinusavedsvsperasniohs 34
US Model
AEP Model
E Model
WM-EX50/FX50
UK Model
WM-EX50
Canadian Model
WM-FX50
WWN-FX50
WM-EX50 : MT-WMEX50-01
Tape Transport
Mechanism
WM-FX50 : MT-WMFX50-01
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
*DOLBY” and the double-D symbol OO are trade-
marks of Dolby Laboratories Licensing Corporation.
CASSETTE PLAYER
WM-EX50
RADIO CASSETTE PLAYER
WM-FX50
SONY.

GENERAL
Messages, warnings and tips
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type
recommended by the equipment manufacturer.
Discard used batteries according to manufacture’s
instructions.
ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig handtering.
Udskiftning ma kun ske med batteri
af samme fabrikat og type.
Lever det brugte batteri tilbage til leverand¢ren.
ADVARSEL
Lithiumbatteri - Eksplosjonsfare.
Ved utskifting benyttes kun batteri som
anbefalt av apparatfabrikanten.
Brukt batteri retuneres apparatleverand¢ren.
VARNING
Explosionsfara vid felaktigt batteribyte.
Anvand samma batterityp eller en ekvivalent
typ som rekommenderas av apparattillverkaren.
Kassera anvant batteri enligt fabrikantens
instruktion.
VAROITUS
Paristo voi rajahtaa, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan
tyyppiin. Havita kaytetty paristo valmistajan ohjeiden
mukaisesti.
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK A\ OR
DOTTED LINE WITH MARK /\ 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.
ATTENTION AU COMPOSANT AYANT
RAPPORT A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE
MARQUE /\ SUR LES DIAGRAMMES SCHE-
MATIQUES ET LA LISTE DES PIECES SONT
CRITIQUES POUR LA SECURITE DE FONCTION-
NEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.
Precautions
Notes on battery
* Romove the battrey when you will not use the unit
for a long time to prevent damage from battery
leakage and corrosion.
* When the sound becomes unstable, try a new
battery.
External power sources
The following external power sources can be con-
nected through the DC IN 1.5V jack.
* House current using an AC-E15L AC _ power
adaptor.
The illustration shows the polarity of DC IN 1.5V
jack. Use only a power cord having the same polarity.
oy,

Test equipment,Jigs and Material
Test equipment
Digital multimeter
FM RFF signal generator
AM RF signal generator
Stabilized power supply
Speed checker
Wow and Flutter
Frequency counter
VTVM
Spectrum analyzer
SONY Digital tuning radio ICF-2001 or equivalents
Feature
¢ Double Super heterodyne FM receiver for
WM-F X50
The FM receiver is used the double super hetero-
dyne system which is superior in FM sensitivity and
image sprious rejection.
System comparison chart
| WM-FX50 WM-F702
Doubl Sing]
a3 ouble super ingle super
BC Systm heterodyne (FM) | heterodyne
Detector Double pulse count | Quadrature
AM IF 55kHz 450kHz
28.6MHz (1st IF) 10.7MHz
EMR 150kHz (2nd IF)
Filter element __| Monolisic Ceramic
Method of calculation
NOTE: fs = Tuned frequency
* FM local oscillator frequency
1st stage local oscillator frequency (fo)
(cad (284 = OSC )
[For Example]
Tuned at 100MHz
— 150kHz
57.5
fo = 100 + a) — 150kHz = 128.6MHz
2nd stage local oscillator frequency
57.5MHz (fixed)
Jigs
Test tape Part Number
- WS-48A (3kHz, 0dB) 7-819-032-11
Cassette type torque meter
- CQ-102C (normal direction) 8-909-708-22
- CQ-102RC (reverse direction) 8-909-708-26
- CQ-201B (FF and REW) 8-909-708-41
Cassette type Tension meter
- CQ-403A (normal direction) 8-909-708-92
- CQ-403R (reverse direction) 8-909-708-95
Screw locking compound
Neji lock G (1401B) 7-432-114-11
Greases and Oil
Machine oil Hydro Fruid NT-68 7-661-018-18
Sankol FG-84M 7-662-001-36
* FM image frequency
foil = fs +( S13MHa = 150kH2) x 2
pi oro
[For Example]
Tuned at 100OMHz
foil = 100MHz + ( SEM = 150k) x2
+ 150kHz = 28.9MHz
= 157.2MHz
foi2 = 28.9MHz (Fixed)
* AM local oscillator frequency (fo)
fo = (fs + 55kHz) X 2
[For Example]
Tuned at 1000kHz
fo = (1000kHz + 55kHz) X 2 = 2110kHz
* AM image frequency (foi)
fol = fs + 55kHzX 2
[For Example]
Tuned at 1000kHz
foi = 1000kHz + 55kHzX 2 = 1110kHz

Location and Function of Controls
DIR
To listen to the other side of the tape ~
MEGA BASS
Listening to powerful and heavy sound
Set MEGA BASS to the desired position. aon.
Bass is boosted in the order of NORM, MID and (C ]
MAX.
oes
MAX MID NORM
While playing back hard and stressed sound with MEGA BASS set to
MAX, the sound may be distorted. In this case, set MEGA BASS to
NORM or MID.
DOLBY NR
Getting the best performance from your tape
For Dolby NR processed tapes
[IMW-FX50_ONLY|
LOCAL enna) Ox FM SENS
For normal reception ~
—
If a very strong station signal causes noise Loca, CLES OF FM SENS
The noise will be reduced. —
<< / >>
To wind the tape rapidly
m@ STOP
To stop the tape
MODE
On playback operation
When the playback starts from the reverse side
of the cassette, the unit will be shut off at the end
of that side.
Playing back both sides of the cassette once
MODE Ce 0D
Playing back both sides of the cassette hmm
repeatedly CO |
MODECD* *~)D
woe
METAU ** NORM
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For normal (TYPE |) tapes
For CrOz (TYPE II) or metal (TYPE IV) tapes
METALS ** NORM
CO,
TAPE
RADIO CEM MONO TAPE ARO
For normal reception
=o
RADIOL EMMONS TAPE Huot
CoD)
lf it is hard to hear the broadcast due to noise, the
noise will be reduced.
In this mode, there is no stereo effect. ae

User’s Instruction
Setting the Cl ck
Before setting the clock, be sure that the clock indication appears in
the LCD display window.
Ex: Tosetto 1:15p.m.
1 Press the OPEN button.
2 Press the CLOCK button for 1.5 seconds or more.
3 Set the hour.
Press the + button repeatedly until you get the desired setting.
4 Press the CLOCK button.
5 Set the minute.
Press the + button repeatedly until you get the desired setting.
6 Press the CLOCK button.
Notes
© The hour display is in the 12-hour system.
* If you keep pressing the + button, the digits advance in sequence.
¢ The hour display does not advance even when the minute indication returns
to “00” after ‘'59”’.
To change the hour only
Follow steps 1 - 3, then press the CLOCK button twice. (During this operation
the minutes and the seconds do not advance.)
To change the minute only
Follow steps 1 - 6 but skip step 3.
(During this operation the seconds advance.)

Inserting a Lithium Battery
With the + (plus) mark facing out
Avec le repére + (plus) vers l’ex-
térieur
Con la marca + (positiva) hacia
afuera
Como 0 lado + (positivo) voltado
parao exterior.
Note
If the lithium battery compartment lid is detached
by an accidental drop, etc. attach it as illustrated.
Before operation, be sure to install a lithium battery (supplied). With the lithium battery
installed, this unit powers the clock and displays the tape operation indications in the
LCD display window during the tape playback.
Lithium battery life
Approximately one year and a half in normal operation.
if the lithium battery becomes weak, the letters on the display will become indistinct. In
this case, replace the battery with a Sony CR2025 lithium battery. Use of another
battery may cause a risk of fire or explosion. After replacing the battery, reset the clock.
Cautions
* Keep the lithium battery out of the reach of children. Should the battery be
swallowed, consult a doctor immediately.
* Before use, wipe the battery with a dry cloth to assure a good contact.
¢ Be sure to observe the correct polarity when installing the battery.
* Do not hold the battery with metallic tweezers, otherwise a short-circuit may
occur.
* Do not break up the battery or throw it into a fire because it may explode. Carefully
dispose of the used batteries.
Warning
Battery may explode if mistreated. Do not recharge, disassembie or dispose of in
fire.
Service Notes
How to check the operation
When audio board has been removed from mechanical
deck. Depress the PLAY (®) button to turn ON the
S901 (POWER) and S902 (PLAY).
AUDIO BOARD - Component side -
$902
(PLAY)
5901 (POWER)
Wide mouth clip
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 con-
ductor of the circuit board (within 3 times).
-Be careful not to apply force on the conductor when
soldering or unsoldering.
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.

REMOVAL
Note : Follow the disassembly procedure the numerical order given.
Tuner unit (WM-FX50)
@ SCREW (M1.4x 2)
@ SCREW (M1.4X 2)
) COVER
TUNER UNIT
CASSETTE LID ASSY
TUNER FLEXIBLE BOARD
(By soldering iron)
@ KNOB
(FUNCTION)
To take off the tuner unit from cassette lid ass’y.
Warm up @ to @ portion by heater and move it slowly by tweezers.
HEATER
Tweezers
Both sides adhesive sheet

LCD BLOCK INFORMATION
Clock operation
LCD will operate as a clock indication with the
following conditions.
1. When the data code 0000 or 0100 feed into input
port. (data code show in chart 1)
2. When the dry penlight battery (AM3/LR6) or
Ni-Cd battery is not built- in the battery case.
Refer to User’s instruction ’Setting the clock” page 5.
Tape running indication
LCD will operate as a tape running indication mode
when it assembled the data code of chart 1.
* PLAY (FWD) - FF (FWD)
» PLAY (RVS) - FF (RVS)
- REW (FWD)
brink
» REW (RVS)
* Error indication mean’s to notified to the customer
that it is abnormal operation when pushing the MD
button in same time.
* The clock will be reset and indicate AM 12: 00 after
all indicator is light.
Indicator is clock mode when rethium battery take
off.
Data code chart and indication mode

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