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KV-20M42/20S42/20S43/21MB42C/21MB42M/21MB42P/21ME42/21ME42C/
21SB42C/21SB42M/21SE42/21SE42C/21SE82/21SE82C
WARNINGS AND CAUTIONS
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED DURING
ANY SERVICE TO AVOID POSSIBLE SHOCK HAZARD,
BECAUSE OF LIVE CHASSIS. THE CHASSIS OF THIS
RECEIVER IS DIRECTLY CONNECTED TO THE AC POWER
LINE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS, AND IN THE
PARTS LIST ARE CRITICAL FOR SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL
OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT
ADJUSTMENTS THAT ARE CRITICAL FOR SAFE OPERATION
ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE
PROCEDURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION IS SUSPECTED.
ATTENTION
APRES AVOIR DECONNECTE LE CAP DE L'ANODE, COURT-CIRCUITER L'ANODE
DU TUBE CATHODIQUE ET CELUI DE L'ANODE DU CAP AU CHASSIS
METALLIQUE DE L'APPAREIL, OU AU COUCHE DE CARBONE PEINTE SUR LE
TUBE CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RESQUE D'ELECTROCUTION PROVENANT D'UN CHÁSSIS
SOUS TENSION, UN TRANSFORMATEUR D'ISOLEMENT DOIT ETRE UTILISÉ
LORS DE TOUT DÉPANNAGE. LE CHÁSSIS DE CE RÉCEPTEUR EST
DIRECTEMENT RACCORDÉ À L'ALIMENTATION SECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE MARQUE
SUR
LES SCHEMAS DE PRINCIPE, LES VUES EXPLOSEES ET LES LISTES DE
PIECES SONT D'UNEIMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES COMPOSANTS SONY
DONT LE NUMERO DE PIECE EST INDIQUE DANS LE PRESENT MANUEL OU
DANS DES SUPPLEMENTS PUBLIES PAR SONY. LES REGLAGES DE
CIRCUIT DONT L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT MANUEL. SUIVRE CES
PROCEDURES LORS DE CHAQUE REMPLACEMENT DE COMPOSANTS
CRITIQUES, OU LORSQU'UN MAUVAIS FONTIONNEMENT SUSPECTE.
SELF-DIAGNOSTIC FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to
flash. The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED
flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the
Remote Commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these
problems occur.
Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If
there is more than one error, the LED will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnostic Item
Description
No. of Times
STANDBY/TIMER
LED Flashes
Self-diagnostic Display/
Diagnostic Result
Probable Cause
Location
Detected Symptoms
Power does not turn on
Does not light
• Power cord is not plugged in.
• Fuse is burned out (F601).
• Power does not come on.
• No power is supplied to the TV.
• AC power supply is faulty.
+B overcurrent (OCP)*
2 times
2:0 or 2:1
• H.OUT (Q502) is shorted (A Board)
• IC701 and Q701 (C Board) are shorted.
• Power does not come on.
• Load on power line is shorted.
Vertical deflection stopped*
4 times
4:0 or 4:1
• +13V is not supplied. (A Board)
• IC541 is faulty. (A Board)
• Has entered standby state after horizontal raster.
• Vertical deflection pulse is stopped.
• Power line is shorted or power supply is stopped.
White balance failure
(not balanced)
5 times
5:0 or 5:1
• Video OUT (Q394 to 392) is faulty. (A Board)
• IC301 is faulty. (A Board)
• Screen (G2) is improperly adjusted.**
• No raster is generated.
• CRT cathode current detection reference
pulse output is small.
* If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.
The symptom that is diagnosed first by the microcontroller is displayed on the screen.
** Refer to Screen (G2) Adjustments in Sections 3 and 4 of this manual.
