Question about Marantz MM8003 8Channel Amplifier

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Can you diy repair a Marantz MM8003 8Channel Amplifier protection circuit

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Posted on Jan 02, 2017

petraman7
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SOURCE: Need the circuit for the input to Marantz 1050 amplifier

Check with a website call hifiengine
Should be there

Posted on Aug 19, 2010

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1 Answer

How to reset marantz sr4001 from protect mode?


Protect mode comes into play when there is a problem with the speakers or amplifier First check all the speakers for opens or shorts If they are fine you don't reset it you repair the receiver.

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Pm5004 protection circuit light stays on


The Protection circuit error detection is faulty or the speakers could be faulty - disconnect the speakers and power on to check

Nov 21, 2013 | Marantz PM5004 Amplifier

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Marantz pm7200 makes loud crackles and cuts out for 1st 30mins and then is ok!


One common explanation is the capacitors fail after a number of years. The lineage of these electrolytic caps usually last about 10 years or so with regular operation.

This is a disappointment and many PC's, top of the line receivers such as yours 10-15 years old are plagued with these failing capacitors.

Suggest if you are DIY replace all electrolytic. If not look for a electronics repair local and get an estimate.

the repair manuals are available.
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The capacitors does not have to leak to fail. Also check for open/cracked solder joints around the power supply and power amps.

I have repaired several PC's and receivers for these defects with only an inspection lamp and multi-meter.

Purchasing a used replacement of the same age will likely require similar repair. Some older units are more reliable?

Good solder skills are critical and if you DIY practice on scrap boards before attempting.
hope this helps?

Dec 10, 2012 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz sr6001 stanby blinking


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Dec 09, 2011 | Marantz SR6001

1 Answer

Standby light is flashing on my marantz sr7001


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the Standby blinking (protect) show or not . if not, then any of the speaker is damaged also check the wire for any short circuit . If then also its goes to protection then it have some hardware truouble inside.

Amplifiers gose protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally amplifiers show this when any of the output amplifier have some problem. there 6 amplifiers in this receiver . May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. Connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). Then connect the positive terminal to all the output transistors emitter pin one by one . The voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than +/- 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
After replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. Put the bulb in a holder. Now you have two wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim ,then remove the power , remove the bulb insert fuse and connect the power and check.
(If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components

OK

Aug 20, 2011 | Marantz SR7001

1 Answer

We have a Marantz sr4500, everytime we put it on it makes a Zzzzzz sound and then it turns off with a loud "buk" sound and shows protect on the amp's screen, after few seconds the amp turns...


It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.In this case I think that some capacitors are faulty as when the set is put on it charges on to make the amplifier work. Possible fault in the protect circuit or preamp.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

May 11, 2011 | Marantz SR4500 Receiver

1 Answer

Audio distorsionado en canal izqierdo


the input selector switches if they are dirty can make the amplifier sound like it has a blown channel.
compare voltages from the left and right channel and make sure they are identical as well as the power supply,typically + and - 65vdc .check the regulators for the pream,they run panel lights off the same circuit + - 14vdc

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3 Answers

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there is short circuit check the transformer and big capasitor for tanrsformer

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Marantz sr 500 going to "protect" mode when on.


Change the audio amplifiers IC´s because are on short circuit

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