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Philips SACD 1000/001 Service Manual Page 48

Dvd-video player.
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GB 48
5.
SACD 1000
PM3394B
ch1
1
CH1 2.00 V~
MTB 500ns
FO
Check for laserlight.
Switch the focus off
Hf path
Play DVD test disc.
Measure outputs of diodes A, B, C, D, E, F.
Name
Testpoint Value
A
F140
B
F141
C
F143
D
F144
E
F147
F
F148
Measure DVDALAS outputs
Name
Testpoint Value
RFO DC
F146
O1
F155
O2
F158
O3
F168
O4
F165
S1
F174
S2
F175
5.6
Test instructions Display board
5.6.1
Display board
Introduction
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
ch1+
CL 06532152_048.eps
051200
2.6V±0.2V
2.6V±0.2V
2.6V±0.2V
2.6V±0.2V
2.6V±0.2V
2.6V±0.2V
2.5V ± 0.2V, eyepattern 1Vptp
25mV±10mV
25mV±10mV
25mV±10mV
25mV±10mV
25mV±10mV
25mV±10Mv
V filament
Display
V filament
Buffer
µProcessor
I2C
Supply:
+5Vstby
+12V
-40V
RC-Eye
Figure 5-10
Functionality description:
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
display scanning).
Has inputs for RC (RC5 and RC6) and P50 (P50
controller is built in).
General
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.
Key-matrix
P50
I/O
CL 96532065_058.eps
130799

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