HELP - SONY CDP-EX800 failure

[Andrzej Stelmach]

Hallo from Poland - sorry for errors in my english !!!
I have a problem with SONY CD-player CDP-XE800. After some basic mechanism
cleaning. The player stop working. Firstly the sound was very silent -
MUTING was always ON. I tried to find what happend - after fer voltage
measurements (I am sure I did not make any shorts and ESD discharges) the
player stopped to respond on load/eject knob - it displays "OPEN", "PLAY"
etc but the load and sled motors are not working and the laser does not lid.
There is a chip controlling o/c motor - LB1641 and it has zener diode 4,7V
connected to pin 4 - it sets the motor operating voltage - and there is 0,7V
on that diode. I exchanged the diode and the LB1641 - no result (only the
diode voltage is now 1,7V). The LB1641 is controlled by the main processor
directly with 2 pins - combination of "0" and "1" on that pins sets the
turning direction - and there is "1" on both pins (and on the processor
terminals also) - that is "braeking" state for motor. Also the other
processor ports driving sled motor and laser (focus etc) and MUTE are set
HIGH. That leads me to conclusion - the main processor is failed. But the
dac chip (CXD8505BQ) is hot and the audio processor is slightly hot - so I
am not sure - maybe the failure is in another component or circuit - not in
the processor itself. So I decided to write to your forum - maybe someone
did already have similar problem and will be able to help me.
I will be gratefull for any suggestions.
Best Regards
Andrzej Stelmach
Poland

 

[Rudolf Ladyzhenskii]

Hi,

This is Asutralian newsgrouo and models sold here are different from ones in
Poland.

As for your problem, I assume you have circuit diagram.
Firstly, check that all voltages are there.
Secondly, is unit a multi-disk one with rotating tray? If yes, they have
very unreliable flat cable that goes to the tray sensors.
I do not think, you killed the processor. While possible it is highly
unlikely.
BTW, what was the original problem?

Rudolf

"Andrzej Stelmach" <andrzejstel@wp.pl> wrote in message
news:bpdhq1$ini$1@atlantis.news.tpi.pl...

Hallo from Poland - sorry for errors in my english !!!
I have a problem with SONY CD-player CDP-XE800. After some basic mechanism
cleaning. The player stop working. Firstly the sound was very silent -
MUTING was always ON. I tried to find what happend - after fer voltage
measurements (I am sure I did not make any shorts and ESD discharges) the
player stopped to respond on load/eject knob - it displays "OPEN", "PLAY"
etc but the load and sled motors are not working and the laser does not
lid.
There is a chip controlling o/c motor - LB1641 and it has zener diode 4,7V
connected to pin 4 - it sets the motor operating voltage - and there is
0,7V
on that diode. I exchanged the diode and the LB1641 - no result (only the
diode voltage is now 1,7V). The LB1641 is controlled by the main processor
directly with 2 pins - combination of "0" and "1" on that pins sets the
turning direction - and there is "1" on both pins (and on the processor
terminals also) - that is "braeking" state for motor. Also the other
processor ports driving sled motor and laser (focus etc) and MUTE are set
HIGH. That leads me to conclusion - the main processor is failed. But the
dac chip (CXD8505BQ) is hot and the audio processor is slightly hot - so I
am not sure - maybe the failure is in another component or circuit - not
in
the processor itself. So I decided to write to your forum - maybe someone
did already have similar problem and will be able to help me.
I will be gratefull for any suggestions.
Best Regards
Andrzej Stelmach
Poland

 

[Ken Taylor]

It's quite possible that the DAC and audio processor will run warm. Not
unusual for hi-frequency AD components.

Ken

"Rudolf Ladyzhenskii" <rudolf.ladyzhenskii@REMOVEopennw.com.au> wrote in
message news:jTQAb.43808$aT.24657@news-server.bigpond.net.au...

Hi,

This is Asutralian newsgrouo and models sold here are different from ones
in
Poland.

As for your problem, I assume you have circuit diagram.
Firstly, check that all voltages are there.
Secondly, is unit a multi-disk one with rotating tray? If yes, they have
very unreliable flat cable that goes to the tray sensors.
I do not think, you killed the processor. While possible it is highly
unlikely.
BTW, what was the original problem?

Rudolf

"Andrzej Stelmach" <andrzejstel@wp.pl> wrote in message
news:bpdhq1$ini$1@atlantis.news.tpi.pl...
Hallo from Poland - sorry for errors in my english !!!
I have a problem with SONY CD-player CDP-XE800. After some basic
mechanism
cleaning. The player stop working. Firstly the sound was very silent -
MUTING was always ON. I tried to find what happend - after fer voltage
measurements (I am sure I did not make any shorts and ESD discharges)
the
player stopped to respond on load/eject knob - it displays "OPEN",
"PLAY"
etc but the load and sled motors are not working and the laser does not
lid.
There is a chip controlling o/c motor - LB1641 and it has zener diode
4,7V
connected to pin 4 - it sets the motor operating voltage - and there is
0,7V
on that diode. I exchanged the diode and the LB1641 - no result (only
the
diode voltage is now 1,7V). The LB1641 is controlled by the main
processor
directly with 2 pins - combination of "0" and "1" on that pins sets the
turning direction - and there is "1" on both pins (and on the processor
terminals also) - that is "braeking" state for motor. Also the other
processor ports driving sled motor and laser (focus etc) and MUTE are
set
HIGH. That leads me to conclusion - the main processor is failed. But
the
dac chip (CXD8505BQ) is hot and the audio processor is slightly hot - so
I
am not sure - maybe the failure is in another component or circuit - not
in
the processor itself. So I decided to write to your forum - maybe
someone
did already have similar problem and will be able to help me.
I will be gratefull for any suggestions.
Best Regards
Andrzej Stelmach
Poland