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Philips SACD 1000/001 Service Manual Page 49

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Diagnostic software, trouble shooting and test instructions
Reset
Check next reset timing with an oscilloscope at pin 10 of the
(processor.
PM3392A
ch2
ch1
T
T1
2
1
CH1 2.00 V=
CH2
2 V=
BWL MTB 100ms- 1.04dv ch2+
Figure 5-11
Timing: 400msec < T1 > 700msec.
CH1: +5Vstby voltage at power on.
CH2: Voltage at pin 10.
Display steering
Check next timing and level for all grid-lines (G1 r G14).
PM3392A
ch1:
low =-34.2 V
ch1
ch1:
high= 3.98 V
1
T
STOP
CH1 10.0 V=
MTB 200us
Figure 5-12
1. Check level A: +4V5 ±10% for grid lines 1 => 11
2. Check level A: +4V0 ±10% for grid lines 12 => 14
3. Check level B: -33V ±10%
4. Check timing and levels of segment-lines P1 r P10:
PM3392A
ch1
1
T
CH1 10.0 V=
BWL MTB 500us- 1.04dv ch1+
Figure 5-13
Level A:+4V5 ±10%
Level B:-33V ±10%
The data on these segment lines depend on the characters
that are displayed.
The characters can be set by sending I2C commands to the
display.
See the Slave URS how to send a display command.
CL 96532065_073.eps
130799
A
B
2324us ch1+
CL 96532065_074.eps
130799
A
B
CL 96532065_075.eps
130799
SACD 1000
Key-matrix
Connect a extra 10k( pull-up to pin 36 en 37 of the uP and
check next matrix scanning at these pins.
PM3392A
ch1:
low =-46.9mV
ch1
ch1:
high= 5.09 V
B
1
STOP
CH1 2.00 V=
MTB10.0ms
Figure 5-14
Level A: 5.0V ±7%
Level B: 0V ±200mV
Check matrix scanning from pin 26 until 33 of the uP.
The results should be the same as the diagram above.
I.R. receiver
Check at pin 23 of the (P if this line switches from low (< 0.3V)
to high (> 4.5V), while pressing a key on a Philips RC5 or
RC6 remote control.
P50 interface
P50 is a bi-directional serial interface, which is used for
communication between video equipment. For European
sets, this communication goes via pin 10 of the scart-bus. In
other regions, it can be a cinch bus at the back of the set.
1. Keep the uP in reset by short-circuiting emitter and
collector of transistor 7108, via resistor 3100 and 3104
transistor 7101 is switched on.
2. Check the voltage at the P50 output connector 1118-5: <
200mV.
When the reset is released the uP output-pin becomes low
and transistor 7101 is switched off.
1. Check the voltage at the P50 output connector 1118-5:
4V9 ±5%.
2. Check also the uP P50 input (uP pin 20): 5V ±5%.
3. Connect the P50 line (connector 1118-5) to ground.
4. Check again the uP P50 input (uP pin 20): <0V3.
5.
GB 49
A
ch1-
CL 96532065_076.eps
130799

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