M
Mike S.
- Jan 1, 1970
- 0
I have a dead Logitech Z-680 5.1 computer speaker system that I was
wondering about doing salvage work on, before discarding.
It consists of a subwoofer with all the amp circuitry and connectors for
the main speakers on the back, and a dedicated control pod that connects
to it using a custom wired DB9 connector.
The system stopped working and, since it was under warranty (and
discontinued), Logitech simply replaced the entire thing with the current
model (Z-5500) and does not want any of the old equipment returned. The
old and new systems are electrically incompatible, so I just boxed the
Z-680 setup and am triyng to decide what to do with it.
The electronics pod, which contains the controls, analog/digital inputs,
Dolby/dts decoders, and preamp, powers up and detects and processes input
signals appropriately. There is a power-on "thump" in all speakers when
you fire the thing up, and the sobwoofer still has a little buzz coming
out of it (that was normal), but after that ... nothing. Audio goes in,
but not out. There is a special test mode that sends tones to all speakers
for setting levels ... I hear nothing.
I'm not sure if the failure is in the pod or the main (audio) unit on the
subwoofer, though I suspect the former. I opened the pod ... lots of
surface mount chips, no visible fuses or resettable devices. Not
user-serviceable.
The subwoofer has this huge metal cage bolted on the back which contains
the audio amplifier circuits. I'm pretty sure the DB9 input on the back
contains the 6-channel preamp output from the control pod. I was thinking
of trying to send some test signals into the subwoofer's input socket, 2
pins at a time, until I figure out whether any of them elicit audio output
from the speakers. Perhaps I can salvage the subwoofer and simply hook a
line-level audio cable to whichever of the two DB-9 pins gives the desired
effect.
Comments/suggestions? Thanks.
wondering about doing salvage work on, before discarding.
It consists of a subwoofer with all the amp circuitry and connectors for
the main speakers on the back, and a dedicated control pod that connects
to it using a custom wired DB9 connector.
The system stopped working and, since it was under warranty (and
discontinued), Logitech simply replaced the entire thing with the current
model (Z-5500) and does not want any of the old equipment returned. The
old and new systems are electrically incompatible, so I just boxed the
Z-680 setup and am triyng to decide what to do with it.
The electronics pod, which contains the controls, analog/digital inputs,
Dolby/dts decoders, and preamp, powers up and detects and processes input
signals appropriately. There is a power-on "thump" in all speakers when
you fire the thing up, and the sobwoofer still has a little buzz coming
out of it (that was normal), but after that ... nothing. Audio goes in,
but not out. There is a special test mode that sends tones to all speakers
for setting levels ... I hear nothing.
I'm not sure if the failure is in the pod or the main (audio) unit on the
subwoofer, though I suspect the former. I opened the pod ... lots of
surface mount chips, no visible fuses or resettable devices. Not
user-serviceable.
The subwoofer has this huge metal cage bolted on the back which contains
the audio amplifier circuits. I'm pretty sure the DB9 input on the back
contains the 6-channel preamp output from the control pod. I was thinking
of trying to send some test signals into the subwoofer's input socket, 2
pins at a time, until I figure out whether any of them elicit audio output
from the speakers. Perhaps I can salvage the subwoofer and simply hook a
line-level audio cable to whichever of the two DB-9 pins gives the desired
effect.
Comments/suggestions? Thanks.