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MARANTZ PM68 AMPLIFIER UNIT WILL NOT SWITCH OUT OF SAFE MODE. OUTPUT STAGE TESTED AND WORKING OK.

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Clean the switches with an alcohol and needs also re soldering works.Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....If i have helped,please click to rate.It is the only way i get paid for my work...

Hope this may help;

Regards,
VOTIT

Posted on Jul 29, 2008

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Posted on Jan 02, 2017

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3 Answers

I have a Marantz turntable, a Marantz CD player, an Eltax tape player and a Marantz amplifier with two Cambridge speakers, how do I assemble them into a stack system please ? Thank you


All the sources, turntable, CD player and tape unit have an output. These should go in the input of the amplifier with the same name. Then only the Tape player, could have an input, for recording music or whatever. For that input, your amplifier should have an tape out. All these should be connected with cables with tulip plugs, like these.

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Use the white for left on everything and red for right.
If one of the devices as a different connector, find a cable for audio, with on one end the tulip plugs and on the other end the fitting plug.
Then the output of the power amplifier it should say output or LS, can be connected with 2 wires going to the speakers.
For this the same counts, although it is difficult to see when you use electrical wires in one colour. What comes out red on he amp, should go on the same screw connector on the speaker. Just to avoid one speaker being out of phase. It will work, but could sound a little strange when the speakers are out of phase.
With the correct model names added, perhaps we could have given a more accurate answer.

Success.
Please don't test the system or switch on, with the volume button to the max. Don't switch anything on an amplifier when the volume is high, or the setting is high. A short increase of the volume, during switching can, and has very often destroy(ed) the speakers.

Mar 11, 2015 | Marantz Audio Players & Recorders

1 Answer

Marantz amplifier PM68 replace fuse


You don't see any glass fuses? There is also a non replaceable fuse in the power transformer.

Apr 06, 2014 | Marantz PM-68 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

2 Answers

I am thinking of replacing my now very old JVC AX 330 amplifier with a Marantz PM7003 amplifier and want to know if this is a suitable replacement in terms of power output etc.


You, sir, are a rare adherent to stereo-only electronics. Are you replacing it for cause (showing its age)? The PM7003 is only 2 x 70 watts like the JVC but it also has separable preamp/amps so you COULD upgrade or augment the power output with external amps and still control it all locally.

Of course, any current AVR's do that too and bring digital sources and multichannel audio to the mix for as little as the PM7703 may cost.

Jun 23, 2011 | Audio Players & Recorders

1 Answer

Our receiver automatically shuts down, showing 'protect' in the display, when volume is turned up to -30 db. How can we stop/reset this? We really appreciate your answer.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If its goes to protection mode when you incrase the volume then check the impedance of your speakers it should be 4ohms or above . Test with some other speakers if available.

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 are two amplifiers stage left and right . 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

Jun 13, 2011 | Marantz SR4021

2 Answers

I have one Amp;SR4003.if i on the amp;its showing standby light only.which stage defective.pls give me ans; Regards ...


hi,
check the power supply voltages 5v, +-15v. also check the power on relay driver side. also check is there is any dry soldering in power supply stage. check the output amplifiers is there is any transistor faulty. for any further assistance feel free to contact through fixya.
ok

Dec 23, 2010 | Marantz SR4003 Receiver

1 Answer

When I turn my amp on it stays on for one second and then goes into standby mode. I have unpluged it for five minutes and turned on again and no change.


It is possible that the amplifier is going into the Protect Mode as there are some errors in the board. The prime suspect can be the output section of the amplifer as it might be short therby comsuming higher current for the protection to activate.
Remvoe speakers to test, if not checck the output stages, disconnect power to confirm.

Nov 05, 2010 | Marantz Audio Players & Recorders

1 Answer

No output from one ch on old JVC VN-300 audio amp in stereo mode, power stage seems ok as both ch work ok in mono mode.circuit diagram, anyone?


The stereo/mono switch in most amps mearly feeds one channel to both channals when in mono. However it does mean that the Power Transistors (or whatever does the main output) is working on both channels. Therefore the dead stage is in the pre-amp part. Remember that the two channels will have the same parts as each other. The advantage is that one will have working parts and the other wont. So you can compare the two channels with voltage tests, using a multimeter.

Mar 31, 2010 | Audio Players & Recorders

2 Answers

Marantz dedicated amplifier squeals


The symptom sounds like a feeback loop. As long as that indicator is showing near maximum output on one channel AVOID ATTACHING ANY SPEAKERS TO IT!!!! You'll cook the tweeters.


Turn it off and manually operate every control, knob and pushbutton throughout its range many times to wipe oxides away from their conductors.

Set all EQ controls to their midpoints and re-evaluate.

We don't know if it's an input or output problem yet. Does it do that with all inputs?

Jan 19, 2010 | Marantz PM7200 2-Channel Amplifier

4 Answers

Marantz SR 7200


It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Good luck.

Jan 29, 2007 | Marantz SR-7200 Receiver

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