Read Sony HCD-EX660Z / HCD-EX880Z / HCD-EX990Z / MHC-EX660 / MHC-EX880 / MHC-EX990 Service Manual online
HCD-EX660Z/EX880Z/EX990Z
14
SMPS overload
Current surge to MOSFET by
MOSFET and defect of PS
output line.
MOSFET and defect of PS
output line.
1-2. If output does not come out even if the set status is
not in PROTECT mode
The following defect can be considered.
The kind of defect
The cause is considered
Under Voltage
SMPS switching MOSFET de-
fect.
fect.
RESET defect
Reset signal status from mi-
com is not ‘H’.
com is not ‘H’.
2. Defect of power supply (regulator)
2-1. If the PROTECT mode is “PROTECT ERROR 02”,
The following defect can be considered.
2-1. If the PROTECT mode is “PROTECT ERROR 02”,
The following defect can be considered.
The kind of defect
The cause is considered
OCP (Over Current Protection)
Unusual output voltage of 7V &
9V regulator short.
9V regulator short.
Fan block
Fan supply draw current.
DC Detection
DC appears in SP terminal by
defect of AMP IC and MOS-
FET or output of short-circuit.
defect of AMP IC and MOS-
FET or output of short-circuit.
Click on the first or last page to see other HCD-EX660Z / HCD-EX880Z / HCD-EX990Z / MHC-EX660 / MHC-EX880 / MHC-EX990 service manuals if exist.