Sony HCD-GPX5G Service Manual page 21

1. Defect of AMP circuit
1-1. If PROTECT mode is "AMPLIFIER",
Defects
OTP (Over Tempera-
ture Protection)
DC Detection
Unusual output of
Power mount
1-2. If speaker does not have output even if the set status is not
in PROTECT mode
Defects
Under Voltage
RESET defect
2. Defect of power supply circuit to AMP
2-1. If the PROTECT mode is "POWER SUPPLY",
Downloaded from www.Manualslib.com
The following defect might be possible.
Possible cause
Unusual heat up of MOSFET by im-
proper assembly of heatsink, destruction
of MOSFET etc..
DC appears in SP terminal by defect of
AMP IC and MOSFET or output is short-
circuit.
The power mount has unusual output.
The following defect might be possible.
Possible cause
IC1402 output is below 12V.
Reset signal status from micom is not 'H'.
There is possibility of unusual power supply of any of the
AMP IC or Pre-amplifi er.
• To release from this mode.
Press [ ] button and [ ] button simultaneously
u
x
again or unplug and re-plug in the power cord.
manuals search engine
HCD-GPX5G/GPX7G/GPX8G
21