Marantz NR1606/U1B Service Manual page 44

3.6. Protection History Display Mode
3.6.1. Actions
This mode enables the unit to record and display the event when the THERMAL, ASO or DC protection is activated.
If protections have been activated multiple times, the latest protection operation is recorded.
3.6.2. Starting up
While holding down buttons "ZONE2 SOURCE" and "STATUS" simultaneously, press the power button to turn on the
power.
Select the "2. PROTECTION" using the "INTERNET RADIO" button, then press the "STATUS" button to confirm.
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 has occurred.
FLD
N O P R O T E C T
(b) ASO (if the last protection is ASO)
FLD
P R T : A S O
Cause : A short circuit occurred between the speaker terminals, or speakers with an impedance outside the rating were
connected.
DC output of the power amplifier is abnormal.
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
P R T : D C
Cause : A short circuit occurred between the speaker terminals, or speakers with an impedance outside the rating were
connected.
DC output of the power amplifier is abnormal.
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.
(d) THERMAL (if the last protection is THERMAL(A) or THERMAL(B) or THERMAL(E) )
FLD
P R T : T H E R M A L
FLD
P R T : T H E R M A L
FLD
P R T : 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 2 minutes and the power is turned
off.
(e) Case of CURRENT (when the last protection incident is CURRENT protection)
FLD
: C U R R E N T
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.
A
B
E
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