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5

The identification of errors within the GE-1A chassis is triggered in one of two ways :- 1: Busy or 2: Device failure to respond to IIC. In the event 
of one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with continuous flashing LED) and
then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be dis-
played through the LED (Series of flashes which must be counted) See table 1., non fatal errors are reported using this method. 

 No error

00

Not allowed (may be confused with Sircs response 
flash!)

01

Over Current Protection

02

Over Voltage Protection

03

Vertical Protection

04

No function

05

H - Protection

06

Speaker Protection

07

MEGATEXT

08

NVM

09

Main colour decoder

10

Feature Box 1

11

D/A converter

12

Multi Component processor

13

Multi sound processor

14

DMUX

15

Feature Box 2

16

StBy LED

ON

ON

ON

OFF

OFF

Diagnostic Item

Description

No of times Standby 

LED Flashes

Probable cause

Location

Detected Symptoms

Power does not turn on 

Does not light

Power cord is not plugged in
Fuse is burned out

Power does not come on
No power is supplied to the TV
AC power supply is faulty

+B Overvoltage(OVP)

2 times

H.OUT (Q502) is shorted. (D Board)
IC603 Power IC  is shorted. (D Board)

Power does not come on
Load on power line has shorted

Vertical Deflection stopped

4 times

+15V is not supplied R519 open (D Board)
-15V  is not supplied R518 open (D Board)
IC502 is shorted (D Board)

Vertical deflection pulse has stopped
Power line has shorted

6

Device acknowledge is used to check IIC errors. Device acknowledge is checked by sending an IIC start sequence during CRT power on. Each 
device is checked three times, if there is no acknowledge after every attempt, it will be regarded as an error.
There are three steps to check errors

1. IIC line 0

If all devices except the NVM are errors, IIC line 0 error is displayed

2. Board check

If all devices mounted on one board have errors, board error is displayed

3. Each device check

If IIC line error and board error are not detected then the device with an error is displayed

The detected errors can be displayed as follows:

1. Error Monitor Menu
2. Error Reader

The error monitor menu is displayed by selecting TT22. The following menu will be displayed:

930360h 15h

1. 000h = B-Board
2. 000h = P87C654-Feature Box  *B
3. 000h = no error occured
4. 000h = no error occured
5. 000h = no error occured

New error code sequence is starting

Ignore Errors :                                 [off]

To reset NVM press TT65

7

The error reader display is connected to the service connector to read actual error codes. The part number for the error reader display is  S-188-900-10. 
Once an error has been detected it will then be displayed on the two digit error reader. The errors displayed refer to the following table :

Send Data to Error Reader

Error Code

Data high

Data Low

Error type

Function

00 00h

-

f0h

no device

00 01h

f0h

01h

IIC 0 line

00 02h

f0h

02h

IIC 1 line

01 00h

f1h

00h

A Board

02 00h

f2h

00h

No function

03 00h

f3h

00h

B Board

04 00h

f4h

00h

No function

05 00h

f5h

00h

D1 Board

06 00h

f6h

00h

J Board

07 00h

f7h

00h

Q Board

A Board

01 01h

f1h

01h

ST24C64

NVM doesn’t respond

01 02h

f1h

02h

SDA5273/75

Megatext doesn’t respond

01 03h

f1h

03h

CXA2101

MCP

01 04h

f1h

04h

SDA9361

Deflection doesn’t respond

01 05h

f1h

05h

TVF-01-XXX

Tuner doesn’t respond

01 06h

f1h

06h

No function

01 07h

f1h

07h

MSP3410D

Audio processor

01 08h

f1h

08h

CXA1875

Port Expander for SCART doesn’t respond

01 09h

f1h

09h

CXA1315

Port Expander for UYV doesn’t respond

01 10h

f1h

10h

PCF8574

General Port Expander 1 doesn’t respond

01 11h

f1h

11h

No function

01 12h

f1h

12h

PCF8574

Interrupt Port Expander doesn’t respond

01 13h

f1h

13h

PCF8593

Real Time Clock doesn’t respond

01 14h

f1h

14h

No function

02 01h

f2h

01h

TC9337

Audio Effect Processor (DSP) doesn’t respond

B Board

03 01h

f3h

01h

TDA9144

Colour Decoder doesn’t respond

03 02h

f3h

02h

No function

 

03 03h

f3h

03h

No function

 

03 04h

f3h

04h

P87C654

Feature box1 doesn’t respond

03 05h

f3h

05h

SDA9280

D/A Converter doesn’t respond

03 06h

f3h

06h

P87C654

Feature box doesn’t respond

D1 Board

05 01h

f5h

01h

CXA1875

Port expander for MP, S-Cont doesn’t respond

J Board

06 01h

f6h

01h

CXA1855

AV-Switch Doesn’t respond

06 02h

f6h

02h

TDA7309

Headphone processor doesn’t respond

8

WARNING !!

AN ISOLATING TRANSFORMER SHOULD BE USED DURING ANY
SERVICE WORK TO AVOID POSSIBLE SHOCK HAZARD DUE TO
LIVE CHASSIS. THE CHASSIS OF THIS RECEIVER IS DIRECTLY
CONNECTED TO THE POWER LINE.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY SHADING AND MARKED

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.

ATTENTION !!

AFIN D’EVITER TOUT RISQUE D’ELECTROCUTION PROVENANT
D’UN CHÁSSIS SOUS TENTION, UN TRANSFORMATEUR
D’ISOLEMENT DOIT ETRE UTILISÈ LORS DE TOUT DÈPANNAGE.
LE CHÁSSIS DE CE RÈCEPTEUR EST DIRECTMENT RACCORDÈ
Á L’ALIMENTATION SECTEUR.

ATTENTION AUX COMPOSANTS RELATIFS  Á LA

SÈCURITÈ  !!

LES COMPOSANTS IDENTIFIÈS PAR UNE TRAME ET PAR UNE 

MARQUE

SUR LES SCHÈMAS DE PRINCIPE, LES VUES 

EXPLOSÈES ET LES LISTES DE PIECES SONT D’UNE IMPORTANCE
CRITIQUE POUR LA SÈCURITÈ DU FONCTIONNEMENT, NE LES
REMPLACER QUE PAR DES COMPSANTS SONY DONT LE NUMÈRO
DE PIÈCE EST INDIQUÈ DANS LE  PRÈSENT MANUEL OU DANS
DES SUPPLÈMENTS PUBLIÈS PAR SONY.

Warning and Caution

.....................3

Self-Diagnostic Function

.....................5

Quick Start Guide

.....................9

Overview

.....................10

Additional TV Features

.....................11

Teletext

.....................17

Event Schedule Guide

.....................19

Optional Connectors

.....................20

2-1.

Rear Cover Removal

.....................21

2-2.

Chassis Assy Removal

.....................21

2-3.

Service Position

.....................21

2-4.

A1 Board Removal

.....................21

2-5.

J Board Removal

.....................22

2-6.

B Board Removal

.....................22

2-7.

D1 Board Removal

.....................22

2-8.

H Bracket Removal

.....................22

2-9.

Picture Tube Removal

.....................23

3-1.

Beam Landing

.....................24

3-2.

Convergence

.....................25

3-3.

Focus

.....................27

3-4.

Screen [G2] White Balance

.....................27

4-1.

Electrical Adjustments

.....................29

4-3.

Test Mode 2

.....................31

5-1.

Block Diagram (1)

.....................33

Block Diagram (2)

.....................37

Block Diagram (3)

.....................41

Block Diagram (4)

.....................45

Block Diagram (5)

.....................49

Block Diagram (6)

.....................54

5-2.

Circuit Board Location

.....................59

5-3.

Schematic Diagrams and
Printed Wiring Boards

.....................59

*

C Board

.....................61

*

A Board

.....................69

*

B Board

.....................81

*

A1 Board

.....................90

*

H Board

.....................95

*

D Board

.....................101

*

VM Board

.....................105

*

N Board

.....................109

*

D2 Board

.....................123

*

F1 Board

.....................125

*

D1 Board

.....................131

*

J Board

.....................136

5-4.

Semiconductors

.....................139

5-5.

IC Blocks

.....................142

6-1.

Chassis

.....................144

6-2.

Picture Tube

.....................145

.....................147