Philips L04A AB, Service Manual, Page: 19 / 90

Service Modes, Error Codes and Fault Finding EN 19 L04A AB 5.
5.4.2 Specifications
ComPair consists of a Windows based faultfinding program
and an interface box between PC and the product. The
ComPair interface box is connected to the PC via a serial or
RS232 cable.
In the case of the L01 chassis, the ComPair interface box and
the TV communicate via a bi-directional service cable via the
service connector (connector 0267).
The ComPair faultfinding program is able to determine the
problem of the television set. ComPair can gather diagnostic
information in two ways:
•
Automatic (by communication with the television):
ComPair can automatically read the contents of the entire
error buffer. Diagnosis is done on I2C level. ComPair can
access the I2C bus of the television. ComPair can send
and receive I2C commands to the microprocessor of the
television. In this way, it is possible for ComPair to
communicate (read and write) to devices on the I2C
busses of the television set.
• Manually (by asking questions to the services): Automatic
diagnosis is only possible if the microprocessor of the
television is working correctly, and only to a certain extent.
When this is not the case, ComPair will guide you through
the faultfinding tree by asking you questions (for example;
Does the screen give a picture? Click on the correct
answer: YES / NO) and showing you examples (for
example; Measure test-point I7 and click on the correct
oscillogram you see on the oscilloscope). You can answer
by clicking on a link (for example, text or a waveform
picture) that will bring you to the next step in the faultfinding
process.
By a combination of automatic diagnostics and an interactive
question and answer procedure, ComPair will enable you to
find most problems in a fast and effective way.
Beside fault finding, ComPair provides some
additional
features like:
• Uploading or downloading of presets.
• Management of preset lists.
• If both ComPair and the Force electronic service manual
are installed, all the schematics and CBAs of the television
set are available by clicking on the appropriate hyperlink.
• Example: Measure the DC-voltage on capacitor C2568
(Schematic/Panel) at the Mono-carrier.
– Click on the 'Panel' hyperlink to automatically show the
CBA with a highlighted capacitor C2568.
– Click on the 'Schematic' hyperlink to automatically
show the electronic position of the highlighted
capacitor.
5.4.3 How To Connect ComPair
1. First, install the ComPair Browser software on your PC
(see the Quick Reference Card for installation instructions).
2. Connect the RS232 interface cable between a free serial
(COM) port of your PC and the PC connector (marked with
'PC') of the ComPair interface.
3. Connect the mains adapter to the supply connector
(marked 'POWER 9V DC') on the ComPair interface.
4. Switch the ComPair interface 'off'.
5. Switch the television set 'off' (and remove the mains).
6. Connect the ComPair interface cable between the
connector on the rear side of the ComPair interface
(marked 'I2C') and the ComPair connector on the family
board (connector 0267).
7. Plug the mains adapter in the mains outlet and switch the
ComPair interface 'on'. The green and red LEDs light up
together. The red LED turns off after approximately 1
second, while the green LED remains lit.
8. Start the ComPair program and read the 'introduction'
chapter.
Figure 5-4 ComPair connection
5.4.4 How To Order
ComPair order codes:
•
Starter kit ComPair32/SearchMan32 software and
ComPair interface (excl. transformer): 3122 785 90450.
• ComPair interface (excluding transformer):
4822 727 21631.
• Starter kit ComPair32 software (registration version):
3122 785 60040.
• Starter kit SearchMan32 software: 3122 785 60050.
• ComPair32 CD (update): 3122 785 60070 (year 2002,
3122 785 60110 (year 2003).
• SearchMan32 CD (update): 3122 785 60080 (year 2002),
3122 785 60120 (year 2003).
• ComPair interface cable: 3122 785 90004.
• Transformer (non-UK): 4822 727 21632.
Note: If you encounter any problems, contact your local
support desk.
5.5 Error Codes
The error code buffer contains all errors detected since the last
time the buffer was erased. The buffer is written from left to
right. When an error occurs that is not yet in the error code
buffer, it is displayed at the left side and all other errors shift one
position to the right.
5.5.1 How To Read The Error Buffer
You can read the error buffer in 3 ways:
•
On screen via the SDAM (if you have a picture).
Examples:
– ERROR: 0 0 0 0 0 : No errors detected
– ERROR: 6 0 0 0 0 : Error code 6 is the last and only
detected error
– ERROR: 9 6 0 0 0 : Error code 6 was detected first and
error code 9 is the last detected (newest) error
• Via the blinking LED procedure (when you have no
picture). See 'The Blinking LED Procedure'.
• Via ComPair.
5.5.2 How To Clear The Error Buffer
The error code buffer is cleared in the following cases:
•
By using the CLEAR command in the SDAM menu:
–
To enter SAM, press the following key sequence on the
remote control transmitter: '062596' directly followed
by the “OSD" icon button (do not allow the display to
time out between entries while keying the sequence).
– Make sure the menu item CLEAR is highlighted. Use
the MENU UP/DOWN buttons, if necessary.
– Press the MENU RIGHT button to clear the error
buffer. The text on the right side of the 'CLEAR' line will
change from 'CLEAR?' to 'CLEARED'
• If the contents of the error buffer have not changed for 50
hours, the error buffer resets automatically.
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PC VCR I2C Power
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