Trouble Shooting; About The Protective Circuit; Maintenance - Marantz MA-9S1 Mode D'emploi

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 -
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.
I 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 go out and the sound
is muted. (Pressing the METER OFF switch also douses the
meter lights.) This protective circuit works in the following cases.
G
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.
G
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 works. The protective circuit also
works if the speaker cables are accidentally shorted.
If the protective circuit works, the meter lights go out, there-
fore you can know whether or not that is the problem by check-
ing the meter lights.
If it has worked, shut power OFF, wait 1 minute or more, then
reactivate the power.
G
If the amplifier overheats
In the following cases, the amplifier will overheat and the pro-
tective circuit will work .
• 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.
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, benzine, insecticide or other volatile
substances as these wil mar the finish of the equipment. Like-
wise, never use cloths containing chemical substances. If the
equipment get dirty, wipe the external surfaces with a soft,
lint-free cloth.
∞
If the equipment becomes heavily soiled:
on the rear panel?
Only the most competent and qualified service technicians
should be allowed to service the factory-trained warranty sta-
tion personnel have the knowledge and special facilities
needed for repair and calibration of this precision equipment.
After the warranty period has expired, repairs will be per-
formed for a charge if the equipment can be returned to nor-
mal operation.
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
behaviour.
G
Cleaning of equipment external surfaces
• dilute some washing up liquid in water, in a ratio of one
part detergent to six parts water.
• dip a soft, lint free in the solution and wring the it is damp.
• wipe the equipment with the damp cloth.
• dry the equipment by wiping it with a dry cloth.
G
Repairs