Marantz SR7009/FN, Service Manual

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3.6. Protection History Display Mode
3.6.1. Actions
This mode records and displays an event in which the THERMAL, CURRENT, ASO or DC protection was activated.
If protections have been activated multiple times, the latest protection operation is recorded.
3.6.2. Starting up
Hold down buttons "
ZONE SELECT
" and "
BACK
" at the same time and press the power button to turn on the power.
Select the "
2. PROTECTION
" using the button "
CURSOR
f
/
d
", and press the button "
ENTER
" to commit the selection.
3.6.3. Protection information and displays
・Press the "
STATUS
" button in Protection History Display Mode.
・The protection history can be checked.
(a) If no protections have occurred.
FLD
L1
P R O T E C T H I S T O R Y
L2
: N O P R O T E C T
(b) ASO (if the last protection was ASO)
FLD L2
: A S O
Cause: A short circuit occurred between the speaker terminals, or speakers with an impedance outside the rating were
connected.
If the power is turned on during this abnormality, protection is activated after around 6 seconds and the power is turned
off.
(c) DC(if the last protection was DC)
FLD L2
: D C
Cause: Abnormal DC output from the power amp.
If the power is turned on during this abnormality, protection is activated after around 6 seconds and the power is turned
off.
(d) THERMAL (if the last protection was THERMAL(A) or THERMAL(B) or THERMAL(E) or THERMAL(F))
FLD L2
: T H E R M A L A
FLD L2
: T H E R M A L B
FLD L2
: T H E R M A L E
FLD L2
: T H E R M A L F
Cause:Abnormal heat sink temperature.
If the power is turned on during this abnormality, protection is activated after around 6 seconds and the power is turned
off.
(e) Case of CURRENT (when the last protection incident was CURRENT protection)
FLD L2
: C U R R E N T
If the power is turned on during this abnormality, protection is activated after around 2 minutes and the power is turned
off.
Caution： These protections may also be activated due to causes such as disconnection of connectors or operations
around the microcomputer.
After viewing the above protection history, press the button " STATUS " to return to the normal display.
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