Read Sony DAV-SZ1000W / HBD-SZ1000W (serv.man2) Service Manual online
(Note) How to check when the unit shuts down
•
If abnormal audio output is detected at the SYSTEM CONTROL, “Protector” indication
appears on the FLUORESCENT INDICATOR TUBE and the main unit stops operation.
appears on the FLUORESCENT INDICATOR TUBE and the main unit stops operation.
•
If there is any abnormal temperature increase in the DIGITAL POWER AMPs, check the
connection between HEATSINK and DIGITAL POWER AMP and also check how the
connection between HEATSINK and DIGITAL POWER AMP and also check how the
connection between HEATSINK and DIGITAL POWER AMP, and also check how the
DC FAN is spinning.
DC FAN is spinning.
•
If abnormal DC level is detected, measure resistance value between the + terminal and –
terminal of each speaker outputs, while the power cord is disconnected from the main
unit.
terminal of each speaker outputs, while the power cord is disconnected from the main
unit.
•
In normal condition most of those measured values should be similar. However, if one of
those values is significantly different form the other results, the DIGITAL POWER AMP
which connects to the terminal may be damaged The DIODE connected to the
those values is significantly different form the other results, the DIGITAL POWER AMP
which connects to the terminal may be damaged The DIODE connected to the
which connects to the terminal may be damaged. The DIODE connected to the
concerned signal line, when the DIGITAL POWER AMP was damaged, may also
damaged as well. If it does not recover from the system even though the DIGITAL
POWER AMP is replaced, check the concerned DIODE.
concerned signal line, when the DIGITAL POWER AMP was damaged, may also
damaged as well. If it does not recover from the system even though the DIGITAL
POWER AMP is replaced, check the concerned DIODE.
(Note) If the symptom can not be duplicated
•
If the symptom can not be duplicated, the reason why “Protector“ indication appeared
y p
p
,
y
pp
can be checked in PROTECTION FACTOR IDENTIFICATION TEST MODE.
(Note) Caution for checking the SPEAKER output
•
The speaker output activates speakers by using the difference voltage between terminals
and it is not connected to GND. For this reason the DIGITAL POWER AMP may become
damaged if the speaker terminal shorts out with the GND terminal. Be careful not to
connect the speaker terminal to the GND while operation checking
and it is not connected to GND. For this reason the DIGITAL POWER AMP may become
damaged if the speaker terminal shorts out with the GND terminal. Be careful not to
connect the speaker terminal to the GND while operation checking
19
connect the speaker terminal to the GND while operation checking.
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