CH1 2.00 V~
Check for laserlight.
Switch the focus off
Play DVD test disc.
Measure outputs of diodes A, B, C, D, E, F.
Measure DVDALAS outputs
Test instructions Display board
These test instructions are written for all versions of the
display PCB 3104 123 42230.
The contents of the PCB can be split up into next blocks:
Diagnostic software, trouble shooting and test instructions
2.5V ± 0.2V, eyepattern 1Vptp
The essential component of the display PCB is the uP
(slave). This slave works on an 8MHz resonator and has a
reset circuit that is triggered by the +5Vstby. After the reset
pulse, the standby control line will release the reset of the
host uP. This host uP will then initialise the slave. In addition,
when going to stand-by, the slave will put the host uP in reset.
When the slave receives the right IR or key code to leave the
standby mode, the reset of the host uP will be released.
Other slave functions are:
Square signal generator to generate the filament voltage,
which is required for an AC FTD.
Generates the grid and segment scanning for the FTD.
Generates a scanning grid for the keys (separated from
Has inputs for RC (RC5 and RC6) and P50 (P50
controller is built in).
Oscilloscope measurements have been carried out using
a Philips PM3392A.
Impedance of measuring-equipment should be > 1MΩ.
To do correct measurements we recommend to use
supply 3122 427 21370, which is used in all "second
generation B" DVD-players. Make sure that the main
3.3V has a 0.7A load.