WARNINGS AND CAUTIONS
CAUTION! | ATTENTION |
|
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
ÁON 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.
APRES AVOIR DECONNECTE LE CAP DE L'ANODE,
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
ÁSUR 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
1. DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY/TIMER lamp will flash a set number of times to indicate the possible cause of the problem. If there is more than one error, the lamp will identify the first of the problem areas.
Results for all of the following diagnostic items are displayed on screen. No error has occured if the the screen displays a "0" .
Diagnostic Item
Description
No. of times
STANDBY/TIMER lamp flashes
Diagnostic result
Probable Cause
Location
Detected Symptoms
* Power does not turn on | Does not light |
|
|
| * Power cord is not plugged in. | * Power does not come on. |
|
|
|
|
| * Fuse is burned out (F5050) (E Board) | * No power is suppled 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) | * Power does not come on. | |
|
|
|
|
| * IC1751 and Q1751 is shorted. (C board) | * Load on power line is shorted. |
|
|
|
|
|
|
|
* Vertical deflection stopped | 4 times |
| 4:0 or 4:1 | * +13V is not supplied. (A board) | * Has entered standby state after horizontal raster. | |
|
|
|
|
| * IC 541 is faulty (A board) | * Vertical deflection pulse is stopped. |
|
|
|
|
|
| * Power line is shorted or power supply is stopped. |
* White balance failure | 5 times |
| 5:0 or 5:1 | * Video OUT (Q306 to 308) is faulty. (A board) | * No raster is generated. | |
(not balanced) |
|
|
|
| * IC301 is faulty. (A board) | * CRT cathode current detection reference pulse |
|
|
|
|
| * G2 is improperly adjusted. (Note 2) | output is small. |
|
|
|
|
|
|
|
Note 1: 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.
Note 2: Refer to Screen (G2) Adjustment in Section
— 4 —
