Marantz PM-15S2 PM-15S2 User Manual - English - Page 29

BASIC CONNECTIONS NAMES AND FUNCTIONS TROUBLESHOOTING ADVANCED OPERATIONS ADVANCED CONNECTIONS BASIC OPERATIONS ENGLISH TROUBLESHOOTING ABOUT THE PROTECTION CIRCUIT This unit is equipped with a protection circuit to protect the amplifier circuits and speaker system from damage. ¶ At power on For about 8 seconds after the power is turned on, the protection circuit is activated, muting the sound to give the amplifier circuits time to stabilize. Once the amplifier circuits stabilize, the protection circuit is released, and audio is enabled. ¶ In the event of overcurrent The protection circuit is activated if current exceeding a certain level is detected, which can happen if excessive signal flow is input to the amplifier or if the unit is connected to a speaker system of less than 4 Ω impedance. The protection circuit is also activated if a speaker cable shorts. ¶ If excessive ultrabass signals are input The protection circuit is also activated if ultrabass signals are input. ¶ If the main-amplifier overheats The protection circuit is activated if the temperature of the mainamplifier section rises above a certain level, which can happen if the amplifier is continuously used with excessive signal flow being input to it. The protection circuit is also activated when the specified operating temperature is exceeded, which can happen if the vents on top of the amplifier are covered or if the amplifier is installed on a cramped audio rack. In such cases, "PROTECT" flashes on the display, and the volume is automatically decreased. After about 8 seconds, the protection circuit is deactivated. Adjust the volume again. If the abnormality persists, the unit will automatically shut itself off, and the OPERATE indicator will flash (twice per second). In such a case, turn the unit off then back on again after about 1 minute. 7 In the event of amplifier trouble The protection circuit is activated, and the power is automatically shut OFF, if an abnormality is detected in the power circuit. The same happens if the main fuse inside the amplifier blows. In such cases, the OPERATE indicator flashes. (8 times per second) Turn the unit off then after several minutes turn it on again. If the display does not light up, and the OPERATE indicator remains flashing after the unit is turned on again, the unit may be in failure. In such a case, disconnect the power cord immediately, and contact the place of purchase, your nearest Marantz dealer, our customer service center, or our repair service center. 7 Error messages When multiple amplifiers are connected by F.C.B.S., the error messages described in the table below may be displayed on the display. In such a case, ID number setting or remote cable connection may be in failure. Check the ID number or remote cable connection, referring to the table below. For details on ID number setting, see "HOW TO SET ID NUMBERS", on page 17. Indication Meaning Measures to be taken Multiple 1 ERROR 02 amplifiers take ID No. 2. Multiple Assign different 2 ERROR 03 amplifiers take ID ID numbers to the No. 3. amplifiers. Multiple 3 ERROR 04 amplifiers take ID No. 4. The amplifiers with ID Nos. If the amplifier with ID No. 1 is not on, turn 4 ERROR 11 2-4 cannot communicate it ON. Check that the with the amplifier remote cable is with ID No. 1. properly connected. The amplifier with If multiple amplifiers ID No. 1 cannot communicate 5 ERROR 12 with the take ID No. 1, set ID numbers properly. Check that the amplifiers with ID remote cable is Nos. 2-4. properly connected. OTHERS 23