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— 22 —

The identification of errors within the BE-4A chassis is triggered in 1 of 2 ways :- 1: Bus busy or 2: Device failure to respond to
I  C. 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 a continuous flashing LED) and then communicate with each relevant device in turn to establish if a device is faulty.
If a device is found to be faulty the relevant device number will be displayed through the LED by a Series of flashes which must
be counted (See Table 1)., on fatal errors are reported with this method.

If a fatal error is found, the set will simply stay in whichever state it was when the error occurred, but if a non fatal error occurs
the set will try to continue to operate.

2

                                  Meaning

IC301 not acknowledging I  C transmission, NVM OK.

IC301 FAULT (Not OK) - flags

IC301 - No H Flyback

IC301 - Stack Overflow.

Overvoltage / Overcurrent Protection (Pin 52) high.

IC002 not acknowledging I  C transmission, IC301 OK.

IC002 and IC301 - No I  C acknowledgment.

General I  C Error (SDA or SCL being held low)

(IC301, IC001, IC002, CN001)

2

3

4

5

6

7

8

9

   

2

2

2

2

Flash Timing Example : e.g. error number 3

Stby LED

Note : Deflection System Adjustments should not be carried

out whilst using an NTSC (60Hz) signal, or if the
signal is unlocked.

ON

ON

ON

OFF

OFF

— 26 —

•

All capacitors are in 

µ

F unless otherwise noted.  pF:  

µµ

F

50WV or less are not indicated except for electrolytic and
tantalums.

•

All resistors are in ohms.
k  = 1000  , M  = 1000K

•

Indication of resistance, which does not have one for rating
electrical power, is as follows.

Pitch : 5 mm
Rating electrical power     W

•

: nonflammable resistor.

•

: internal component.

•

: panel designation, or adjustment for repair.

•

All variable and adjustable resistors have characteristic curve
B, unless otherwise noted.

•

: earth - ground.

•

: earth - chassis.

•

: no mounted.

1

4

/

RESISTOR

: RN

METAL FILM

: RC

SOLID

: FPRD

NONFLAMMABLE CARBON

: FUSE

NONFLAMMABLE FUSIBLE

: RS

NONFLAMMABLE METAL OXIDE

: RB

NONFLAMMABLE CEMENT

: RW

NONFLAMMABLE WIREWOUND

:

ADJUSTABLE RESISTOR

COIL

: LF-8L

MICRO INDUCTOR

CAPACITOR

: TA

TANTALUM

: PS

STYROL

: PP

POLYPROPYLENE

: PT

MYLAR

: MPS

METALIZED POLYESTER

: MPP

METALIZED POLYPROPYLENE

: ALB

BIPOLAR

: ALT

HIGH TEMPERATURE

: ALR

HIGH RIPPLE

Note : The components identified by shading and marked

        are critical for safety. Replace only with the
part number specified.

Note : Les composants identifies par une trame et une

marque        sont critiques pour la securite.
Ne les remplacer que par une piece portant le
numero specifie.

•

Readings are taken with a colour-bar signal input.

•

Readings are taken with 10M

Ω

 digital multimeter.

•

Voltages are dc with respect to ground unless otherwise noted.

•

Voltage variations may be noted due to normal production
tolerances.

•

All voltages are in V.

•

Circled numbers are waveform references.

•

: B+ bus.

•

: signal path. (RF)

A

C

— 37 —

HZT33-02RE
UPC574J

16

9

1

8

( TOP  VIEW )

1

26

27

52

SBX1790-51

8

7

6

5

1

2

3

4

( TOP VIEW )

CATHODE

ANODE

1

(TOP VIEW)

20

21

40

( TOP  VIEW )

1

16

17

32

( TOP  VIEW )

1

9

1

9

MC44002P
MC44007P

MC44140P

SAA5288ZP/014
SAA5290ZP/014

STR-S5706

ST24C02CB1

1 2 3 4 5 6 7 8 9

E

C

B

E

B

C

E

C

B

TDA1013B

TDA8139

TDA9806
TDA9812

BF421
2SA1091-O

BF871-127

E

C

B

C

B

E

B

C

E

E

C

B

E

C

B

E

C

B

2SC3209LK
2SD774-34

S2000N-16E305A

2SA933AS
2SA933S
2SA1175-HFE
2SC2410SN

LETTER SIDE

2SC2688-L  

2SC3779C, D-AA

CATHODE

ANODE

CATHODE

ANODE

CATHODE

ANODE

BYD33G
EG-1Z-V1
EGP20G
EL1Z
EM1-V1
ERC06-15S
ERD28-06S
ERD28-08S

EU-1Z
RGP02-17EL-6433
RGP02-17PKG23
RGP10GPKG23
RGP15J-6040FG23
RU3AM
1SS168
1SS238

ERA81-004
ERA83-006
MTZJ-5.1B
MTZJ-5.6B
MTZJ-6.8A

GBU4JL-6088

1SV214

LR5360-HL

CATHODE

ANODE

7

1

STV9379

RD5.1ESB2
RD5.6ESB2
RD6.8ESB2
1SS133T-77

2SC1740S
2SC2785-HFE

E

C

B

2SD1408-Y
2SD1761-E
2SD2394-EF

DTA144ES
DTC114ES
DTC144ES

C

B

E

DTC144EK
2SA1162-G
2SA1037K
2SC2412K-QR