May 1999
SM00020
CPX1498MS
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
CAUTION:
Before servicing this chassis, it is important that the service technician read
the "Safety Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les
«Précautions de sécurité» et les «Notices de sécurité du produit» présentés
dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die ,,Sicherheitshinweise"
und ,,Hinweise zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le
présent
manuel
d'entretien
peuvent
faire
l'objet
de
modifications
en
vue
de
perfectionner le produit.
Die in diesem Wartungshandbuch
enthaltenen
Spezifikationen
können
sich
zwecks
Verbesserungen ändern.
CPM2104M
2
ENGLISH ................................................................................... 4
SAFETY.....................................................................................................4
Safety Precautions.............................................................................................................. 4
CIRCUIT DESCRIPTION ............................................................................5
Audio .................................................................................................................................. 5
Luminance Circuitry .......................................................................................................... 6
Chrominance Circuitry ...................................................................................................... 7
AV input control, Picture set-up control ............................................................................ 8
Protection mode ................................................................................................................. 9
Deflection Circuits ........................................................................................................... 10
Horizontal Stage............................................................................................................... 11
Vertical Stage ................................................................................................................... 12
Power Supply Circuit ....................................................................................................... 13
SERVICING .............................................................................................14
Picture And Control Adjustments..................................................................................... 14
Cut Off And Screen Adjustment........................................................................................ 15
White Balance .................................................................................................................. 16
Protection Checks ............................................................................................................ 17
FRANÇAIS ............................................................................... 18
SÉCURITÉ...............................................................................................18
Precautions de securite .................................................................................................... 18
DESCRIPTION CIRCUIT.........................................................................20
Audio ................................................................................................................................ 20
Ensemble de circuits de luminance .................................................................................. 21
Ensemble de circuits de chrominance.............................................................................. 22
Commande d'entrée AV, commande de programmation image....................................... 23
Mode de protection .......................................................................................................... 24
Circuits de déviation ........................................................................................................ 25
Etage horizontal ............................................................................................................... 26
Etage vertical ................................................................................................................... 27
Circuit d'alimentation...................................................................................................... 28
ENTRETIEN COURANT...........................................................................29
Reglages De l'Image Et De Commande........................................................................... 29
Coupure Et Reglage De l'Ecran ...................................................................................... 30
Balance Des Blans ........................................................................................................... 31
Controles De Protection .................................................................................................. 32
DEUTSCH ................................................................................ 33
SAFETY...................................................................................................33
Sicherheitshinweise .......................................................................................................... 33
CIRCUIT DESCRIPTION ..........................................................................35
Audio ................................................................................................................................ 35
Videosignaleingang Leuchtdichteschaltungen................................................................. 36
Chrominanzschaltungen................................................................................................... 37
AV-Eingangsregelung, Regelung der Bildeinstellung...................................................... 38
Absicherungsmodus.......................................................................................................... 39
Ablenkungsschaltungen.................................................................................................... 40
Horizontale Stufe.............................................................................................................. 41
Vertikale Stufe .................................................................................................................. 42
Stomversorgung................................................................................................................ 43
3
SERVICING .............................................................................................44
Einstellen Des Bilds Und Der Bedienungselemente......................................................... 44
Begrenzungs- Und Bildschirmeinstellung........................................................................ 45
Weissabgleich................................................................................................................... 46
Schutzprüfungen............................................................................................................... 47
SCHEMATICS ......................................................................................... 48
CIRCUIT BOARDS .................................................................................. 50
WAVEFORMS......................................................................................... 52
INTEGRATED CIRCUITS ........................................................................ 57
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Circuit Description
Audio
The sound stages consist of I301 (AV switch IC), I201 (processor IC) and I401 (output amplifier).
Audio input is via the phono sockets J401 and J402 to I301(AV switch IC) where the input selection
process takes place.
Audio input 1 is via phono socket J401, R472, R304, E302/E301 pin 15 and C481 to pin 12 of I301.
Audio input 2 is via phono socket J402, R305, R307, E302/E301 pin 13 and C476 to pin 13 of I301.
Audio input S3 is via phono socket J402, R471, R302, E302/E301 pin 11 and C477 to pin 14 of I301.
From pin 11 of l301 the audio is taken via C452 to pin 6 of l201 where it can be controlled by the
volume.
Volume control is performed by the DC voltage applied to pin 5 of I201. This is determined by the
Pulse Width Modulation output from pin 2 of I001, which is then fed to I201 after filtering via
R017/R028 etc.
From pin 50 of I201 it then applied to pin 3 of I401 via C421 and R413, amplified, then output to the
speaker from pin 5.
Under no signal conditions, internal circuits in I201 prevents any sound output from being obtained.
The audio signal inputs via the AUDIO-IN phono sockets can also be applied as an output via the
AUDIO-OUT sockets as these are linked together.