Protection History Display Mode - Marantz SR7010 Service Manual

2-2. Protection History Display Mode

2-2.1. Actions
This mode enables the unit to record and display the event when the THERMAL, CURRENT, ASO or DC protection is acti-
vated.
If protections have been activated multiple times, the latest protection operation is recorded.
2-2.2. Starting up
While holding down buttons "ZONE SELECT" and "BACK" simultaneously, press the power button to turn on the pow-
er.
Select the "2. PROTECTION" using the "CURSOR f / d " button, then press the "ENTER" button to confirm.
2-2.3. Protection information and displays
Press the "STATUS" button in Protection History Display Mode.
The protection history can be checked.
(a) If no protections has occurred.
L1
P R O T E C T
FLD
L2
N O
(b) ASO (if the last protection is 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.
Note : A short circuit occurred between the speaker terminals, or speakers with an impedance outside the rating were connected.
If the power is turned on in the abnormal state, protection is activated after around 6 seconds and the power is turned off.
(c) DC (if the last protection is DC)
FLD L2
: D C
Cause : DC output of the power amplifier is abnormal.
If the power is turned on in the abnormal state, protection is activated after around 6 seconds and the power is turned off.
(d) THERMAL (if the last protection is THERMAL(A) or THERMAL(E))
FLD L2
: T H E R M A L
FLD L2
: T H E R M A L
Cause : Abnormal heat sink temperature.
If the power is turned on in the abnormal state, protection is activated after around 6 seconds and the power is turned off.
(e) Case of CURRENT (when the last protection incident is CURRENT protection)
FLD L2
: C U R R E N T
Cause : An overcurrent flowed in power amp.
Caution : These protections may also be activated due to other factors such as disconnection of connectors or operations around the
microcomputer.
After viewing the above protection history, press the "STATUS" button to return to the normal display.
If the power is turned on in the abnormal state, protection is activated after around 2 minutes and the power is turned off.
H I S T O R Y
P R O T E C T
A
E
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