Marantz MA-9S1 MA-9S1 User Manual - Page 17

8. Trouble shooting Should faults occur, in many cases it is not necessary to consult your dealer or a Marantz technical service department. On the basis of the following checks you will be able to rectify a number of faults yourself without difficulty. If the fault cannot be remedied after the following checks, please consult your dealer or nearest Marantz service agent. The unit does not turn ON 1. Is the power cable securely plugged into an AC outlet? Sound is not coming from the speakers 1. Has the wrong input source been selected with the INPUT SELECTOR on the front panel? 2. Is the ATTENUATOR switch set to -∞ on the rear panel? 3. Are speaker cables properly connected to the speaker system? 4. Is the connection cable properly connected to the control (pre) amplifier? 5. Is the control (pre) amplifier or input source wrongly set? 6. Are you using the player in the wrong way? 7. The protective circuit of this unit may have worked. Shut power OFF, wait 1 minute or more, then reactivate the power. s About the Protective Circuit This unit incorporates a protective circuit that protects the amplifier circuit and speaker system against damage. If the protective circuit works, the meter lights shut off and the sound is muted. (Pressing the METER OFF switch also shuts off the meter lights.) This protective circuit works in the following cases. q At power ON When power is activated, the protective circuit works and mutes the sound for about 8 seconds until the amplifier circuit stabilizes. Once the amplifier circuit stabilizes, the protective circuit releases and muting is canceled. At the same time, the meter lights turn ON. q If overcurrent flows to the amplifier circuit (Overcurrent protection) If overcurrent flows to the amplifier circuit because of excessive signal input or if the unit is used with speakers of less than 4 Ω impedance connected to it, overcurrent is detected and the protective circuit will engage. The protective circuit also will engage if the speaker cables are accidentally shorted. If the protective circuit engages, the meter lights shut off, therefore you will know whether or not that is the problem by checking the meter lights. If it has engaged, shut the power OFF, wait 1 minute or more, then reactivate the power. q If the amplifier overheats In the following cases, the amplifier will overheat and the protective circuit will engage. • If the unit is used with the ventilation blocked or obstructed • If speakers of less than 4 Ω impedance are used • If the unit is used for an extended period of time under excessive signal input. 14 9. Maintenance The section describes the care and maintenance tasks that must be performed to optimize the operation of your Marantz equipment. q Cleaning of equipment external surfaces The exterior finish of your unit will last indefinitely with proper care and cleaning, Never use scouring pads, steel wool, scourging powders or harsh chemical agents (e.g., lye solution), alcohol, thinner, benzene, insecticide or other volatile substances as these will mar the finish of the equipment. Likewise, never use cloths containing chemical substances. If the equipment gets dirty, wipe the external surfaces with a soft, lint-free cloth. If the equipment becomes heavily soiled: • dilute some washing liquid in water, in a ratio of one part detergent to six parts water. • dip a soft, lint free cloth in the solution and wring until it is damp. • wipe the equipment with the damp cloth. • dry the equipment by wiping it with a dry cloth. q Repairs Only the most competent and qualified service technicians should be allowed to service your unit. The factory-trained warranty station personnel have the knowledge and special facilities needed for repair and calibrate this precision equipment. After the warranty period has expired, repairs will be performed for a charge. In the event of difficulty, refer to your dealer or write directly to the nearest location to you that is listed on the Marantz Authorized Service Station list. If writing, please include the model and serial number of the equipment together with a full description of what you think is abnormal about the equipment's behavior.