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5. Service Modes, Error Codes and Fault Finding
Index of this chapter:
1. Test points
2. Service Modes
3. Problems and solving tips (related to CSM)
4. ComPair
5. Error Codes
6. The blinking LED procedure
7. Protections
8. Repair tips
5.1
Test Points
The EM5 chassis is equipped with test points printed on the
circuit board assemblies. They refer to the schematic diagram
letters. The numbering is in a logical sequence for diagnostics.
Always start diagnosing (within a functional block), in the
sequence of the relevant test points for that block.
Perform measurements under the following conditions:
•
Set in Service Default Mode.
•
Video: color bar signal.
•
Audio: 3 kHz left, 1 kHz right.
5.2
Service Modes
Service Default Mode (SDM) and Service Alignment Mode
(SAM) offer several features for the service technician, while
the Customer Service Mode (CSM) is used for communication
between the servicer and the customer.
There is also the option of using ComPair, a hardware interface
between a computer (see requirements below) and the TV
chassis. It offers the ability of structured troubleshooting, test
pattern generation, error code reading, software version
readout, and software upgrading.
Minimum requirements: a Pentium processor, Windows 9x/
NT/2000/XP/ME, and a CD-ROM drive (see 'ComPair' section.)
5.2.1
Service Default Mode (SDM)
Purpose
•
To create a pre-defined setting, to get the same
measurement results as given in this manual.
•
To override SW protections.
•
To start the "blinking LED" procedure.
Specifications
•
Tuning frequency: 61.25 MHz (Channel 3.)
•
Color system: NTSC.
•
All picture settings at 50 % (brightness, color, contrast.)
•
All sound settings at 50 %, except volume at 25 %.
•
All service-unfriendly modes (if present) are disabled, like:
–
(Sleep) timer.
–
Child/parental lock.
–
Blue mute.
–
Automatic volume limiter (AVL.)
–
Auto switch-off (when no video signal is received for 10
minutes.)
–
Skip/blank of non-favorite channels.
–
Smart modes.
–
Auto store of personal presets.
–
Auto user menu time-out.
How to enter SDM
To enter SDM, use one of the following methods:
Press the following key sequence on the remote control
transmitter: '062596' directly followed by 'MENU' (do not allow
the display to time out between entries while keying the
sequence.)
Service Modes, Error Codes and Fault Finding
EM5A NTSC
Note: It is possible that the main menu will appear when
entering SDM. To switch it off, push the 'MENU' button again.
•
Short the two pins on the "external part" of the SSB, with
the indication SDM. Activation can be performed in all
modes, except when the set has a problem with the main
microprocessor.
Caution: If SDM is entered via these pins, all software-
controlled protections are deactivated.
•
Use the 'DEFAULT' button in the DST-emulation feature of
ComPair.
After entering this mode, 'SDM' will appear in the upper right
corner of the screen.
How to navigate
When you press the 'MENU' button on the remote control
transmitter, the set will toggle between the SDM and the normal
user menu (with the SDM mode still active in the background.)
How to exit SDM
Use one of the following methods:
•
Press the 'POWER' button on the remote control
transmitter.
•
Use the 'EXIT' button in the DST-emulation feature of
ComPair.
•
Via a standard customer remote control transmitter: key in
'00'-sequence.
5.2.2
Service Alignment Mode (SAM)
Purpose
•
To perform (software) alignments.
•
To change option settings.
•
Easy identification of the software version.
•
To view operational hours.
•
To display (or clear) the error code buffer.
Specifications
•
Operation hours counter.
•
Software version.
•
Option settings.
•
Error buffer reading and erasing.
•
Software alignments.
How to enter SAM
Use one of the following methods:
Press the following key sequence on the remote control
transmitter: '062596' directly followed by 'STATUS/EXIT' (do
not allow the display to time out between entries while keying
the sequence.)
•
Short the two solder pads on the "external part" of the SSB
print, with the indication SAM.
•
Use the 'ALIGN' button in the DST-emulation feature of
ComPair.
After entering this mode, 'SAM' will appear in the upper right
corner of the screen.
Contents of SAM:
•
'Rom Version.' Displays the date of the software and the
software version of the ROM (example:
EM5US1_1.0_01234 = AAABBC-X.Y_NNNNN.)
–
AAA= the chassis name (EM5 is the software
development name for this chassis.)
–
BB= the region: EU= Europe, AP= Asia Pacific PAL/
Multi, AN= Asia Pacific NTSC, US= USA, LT= LATAM.
–
C= the language cluster number.
–
X.Y= the software version, where X is the main version
number (different numbers are not compatible with one
5.
EN 21
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