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Service Modes, Error Codes and Fault Finding

GB 29

EM3E

Figure 5-9

Note: Error codes 1, 6 or 18 are protection codes and in this
case, supplies of some circuits will be switched off. Also in
protection, the LED will blink the number of times equivalent
to the most recent error code.

5.6

The Blinking LED Procedure

5.6.1

Introduction

Via this procedure, you can make the contents of the error
buffer visible via the front LED. This is especially useful for
fault finding, when there is no picture.

When the SDM is entered, the front LED will show (blink) the
contents of the error-buffer. Error-codes

10 are shown as

follows:
–

a long blink of 750 ms (which is an indication of the
decimal digit),

–

a pause of 1.5 s,

–

n short blinks (where n = 1 - 9),

–

when all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,

–

the sequence starts again.

Example: Error 12 9 6 0 0.
After activation of the SDM, the red front LED will show:
–

1 long blink of 750 ms (which is an indication of the
decimal digit) followed by a pause of 1.5 s,

–

2 short blinks followed by a pause of 3 s,

–

9 short blinks followed by a pause of 3 s,

–

6 short blinks followed by a pause of 3 s,

–

1 long blink of 3 s to finish the sequence,

–

the sequence starts again.

Note 1: If errors 1, 6 or 18 occur, the LED

always

gives the

last occurred error even if the set is NOT in service mode.
Note 2: If on the DST the text 'ERROR 2' is displayed, the
communication from the TV to the DST has failed.

5.6.2

How to Enter

Use one of the following methods:
•

Enter the SDM. The blinking red front LED will show the
contents of the error buffer (this works only in ‘normal
operation’ mode).

•

Transmit the commands ‘DIAGNOSE’ - ‘0’ - ‘OK’ with a
DST/ComPair (this works both in ‘Standby mode’ and
‘protection’ mode). The complete error buffer is shown.

•

Via the ‘DIAGNOSE’ - ‘X’ - ‘OK’ function on the DST/
ComPair (where X is a number between 1 and 5):
1.

Press the ‘DIAGNOSE’ button on the DST (possible
in all modes except SAM).

Press ‘1’ to view the last detected error (or ‘2’, etc. to
show the errors before).

Press the ‘OK’ button. The red front LED will now
give the requested error.

5.7

Protections

5.7.1

Introduction

The EM3E has only one micro-processor (OTC), which
remains active during Standby. This because power of the
microprocessor and the attached memory chip set is coming
from the 3V3 supply, which is derived from the 5V Standby-
circuitry (via stabiliser 7005). So in both Power-on as in
Standby mode the microprocessor is connected to this power
supply.

If a fault situation is detected, an error code will be generated
and if necessary, the set is put in protection mode. The
protection mode is indicated by the blinking of the red front
LED at a frequency of 3 Hz (or by a coded blinking in special
cases). In some error cases however, the micro processor
does not put the set in the protection mode (this is the case
with the - hardware - loudspeaker protection of the audio
amplifier).

Error

Device

Description

Defective item

Diagram

Defect. module indication

ST24E32

NVM, spontaneous blinking
1-1-1..

7011

Control

H fail protection

HFB