Marantz MA-9S1 - Manual (Page 17)

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8. Trouble shooting
Should faults occur, in many cases it is not necessary to con-
sult 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 IN-
PUT 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 con-
trol (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.
■
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.
●
At power ON
When power is activated, the protective circuit works and
mutes the sound for about 8 seconds until the amplifier cir-
cuit stabilizes. Once the amplifier circuit stabilizes, the pro-
tective circuit releases and muting is canceled. At the same
time, the meter lights turn ON.
●
If overcurrent flows to the amplifier circuit
(Overcurrent protection)
If overcurrent flows to the amplifier circuit because of exces-
sive 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, there-
fore you will know whether or not that is the problem by check-
ing the meter lights.
If it has engaged, shut the power OFF, wait 1 minute or more,
then reactivate the power.
●
If the amplifier overheats
In the following cases, the amplifier will overheat and the pro-
tective 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.
The section describes the care and maintenance tasks that
must be performed to optimize the operation of your Marantz
equipment.
●
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 solu-
tion), alcohol, thinner, benzene, insecticide or other volatile
substances as these will mar the finish of the equipment. Like-
wise, 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.
9. Maintenance
●
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 Au-
thorized Service Station list. If writing, please include the model
and serial number of the equipment together with a full de-
scription of what you think is abnormal about the equipment's
behavior.