Philips 7603 series, Service Manual

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Service Modes, Error Codes And Fault Finding
Test Points
The chassis is equipped with test points printed on the circuit board assemblies. These test points refer to the functional
blocks:
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:
•
Service Default Mode (when this mode is not present, set all controls to 50% and volume select channel 3).
•
Service Default Mode.
•
Video: color bar signal.
•
Audio: 3 kHz left, 1 kHz right.
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 dealer and customer.
Note: Some L8 and M8 chassis sets use a software version that does not contain the Service Modes (see table). In this
case, use the special Factory Mode Remote Control. This can be ordered by service code 4835 310 57511. Complete
instructions are included. This remote control will place the TV in the Factory Mode and allow access to all adjustments that
a normal Service Mode contains (including setting Option Bytes). Error codes will not be available.
There is also the option of using ComPair, a hardware interface between a computer (see requirements) and the TV chassis.
It offers the ability of structured trouble shooting, error code reading and software version readout for all L8 and M8 chassis.
Requirements: To run ComPair on a computer (laptop or desktop) requires, as a minimum, a 486 processor, Windows 3.1
and a CD-ROM drive. A Pentium Processor and Windows 95/98 are also acceptable (see also ComPair