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Service Modes, Error Codes and Fault Finding

Table 5-3 Error Table

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: If errors 1, 6 or 18 occur, the LED always gives the last
occurred error even if the set is NOT in service mode.

5.6.2

How to Enter

Use one of the following methods:

•

Enter the SDM (only via soldering pads marked 'SDM' on
SSB). The blinking red front LED will show the entire
contents of the error buffer (this works in 'normal operation'
mode and in 'protection' mode).

•

Transmit the commands 'MUTE' - '062500' - 'OK' with a
normal RC. The complete error buffer is shown. This works
only in 'protection' mode.

•

Transmit the commands 'MUTE' - '06250x' - 'OK' with a
normal RC (where 'x' is a number between 1 and 5). When
x= 1 the last detected error is shown, x= 2 the second last
error, etc.... This works only in 'protection' mode.

5.7

Protections

5.7.1

Introduction

The EM5E has only one microprocessor (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. 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 microprocessor does not put
the set in the protection mode (this is the case with the -
hardware - loudspeaker protection of the audio amplifier).
The content of the error buffer can be read via the service menu
(SAM), the blinking LED procedure or via DST/ComPair.  The
DST/ComPair 'diagnose' functionality will force the set into the
'Service Standby', which is alike the usual Standby, however
the microprocessor remains completely in normal operation.
To get a quick diagnosis, the EM5E has three service-modes
implemented:
•