Marantz NR1509 Service Manual page 118

3-2.4. Clearing the Protection History
There are two ways to clear the protection history.
(1) Activate Protection History Display Mode. Press the "STATUS" button to display the protection
history. Press and hold the "DIMMER" button for 3 seconds.
PRT:DC
Press and hold the "DIMMER" button for 3 seconds.
PRT:CLEAR
The above message is displayed and the protection history is cleared.
NO PROTECT
(2) Initialize this unit. (See "POST-SERVICE PRECAUTIONS")
b Use the method in 3-2.4. (1) if you do not want to erase your settings from this unit.
Warning Displays by POWER LED
If the power is turned Off while a protection is being detected, the POWER LED flashes in red to warn
you depending on the protection status as follows.
(1) ASO/DC protection: Flashes at 0.5-second intervals (0.25 seconds lit, 0.25 seconds unlit)
(2) THERMAL (A/B/E) protection: Flashes at 2-second intervals (1 seconds lit, 1 seconds unlit)
(3) CURRENT protection: Flashes at 4-second intervals (2 seconds lit, 2 seconds unlit)
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