When the protection function worked due to a short between speaker terminals.Ĭause: The line between speaker terminals is shorted. Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off. Supplementary information: As current of the power amplifier is detected, the abnormal channel can be identified by checking the current detect transistor. Cause: An excessive current flowed through the power amplifier. When the protection function worked due to excess current. When the protection function worked to turn off the power: The information of protection function which worked at that time is displayed. Display provided when Self-Diagnostic Function started The display is as described below depending on the situation when the power to this unit is turned off. Memory initialization inhibited or Memory initialized. The self-diagnostic function mode is activated with the protection functions disabled. The protection functions other than the excess current detect function will be disabled. Starting Self-Diagnostic Function in the protection cancel mode If the protection function works and causes hindrance to troubleshooting, cancel the protection function by the procedure below, and it will be possible to enter the self-diagnostic function mode. The self-diagnostic function mode is activated. Start up the self-diagnostic function and check that the firmware version and checksum are the same as written ones. Press the Power key to turn off the power. If the display remains unchanged for more than 10 seconds after starting the firmware CD play procedure, perform the firmware CD play procedure again from the beginning. Writing of the firmware starts automatically. Using the sub-menu, have the firmware version and checksum displayed, and note them down.

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