As the audio is good through the headphones it could be something to do with the headphone socket itself. When headphones are plugged in the socket has a switching mechanism that switches the speakers off. So something around the socket or the actual socket might be causing the problem.
Testimonial: "Thanks for the reply Grubhead. I did more testing and it appears the headphones jack is affected. Could a bad ribbon cable from volume to power amp board cause this issue? Here's a picture of the board https://www.photobox.co.uk/my/photo/full?photo_id=501181641332 thanks"
SOURCE: marantz pm 7200 integ.amplifier
Dear Sushant,
I do not think your use of an equalizer has caused any problems. I will explain the proper use of the source/direct button. This button's function is to monitor the output of a recorder connected to the record outputs of your amp. When this button is pressed on the sound going to the speakers comes direct from the "source" (cd, radio tuner, phonograph etc.) when in the off position you can monitor the recording of whatever source is being recorded via the tape deck. This switch must be off to record through the amps record outputs.
To test this, put a blank tape in the tape deck, choose the source as phono and place the dec in record/pause. With the source direct button pressed on you should hear a change in volume when moving the amp's volume knob only. When source direct is off you will be able to hear the output of the tape deck, so adjusting the tape deck's record level will also affect the volume coming out of the speakers. more record level in/ more level out.!
Below is copied from page 9 of your user operation manual for Marantz's explanation of the source/direct button.
best of wishes, Michael Mittelsdorf
SOURCE: Can I remotely control speaker outputs on the Marantz PM 8003?
HI...
You need an 8 ohm stereo "L-pad"
Try partsexpress.com
or
mcmelectronics.com
SOURCE: Muffled/bad sound on 1 channel of Marantz PM4400 amplifier
Go directly to the main amp, follow the leads from the speaker terminals. And you should find something on an heatsink. If there are two transistors see if they are running hotter than the other channel. If you see any damage to them (compare with good channel) replace both!
If all you see is a black box with pins coming out of it you need to replace that. They sometimes have the letters STK on them.
Replace both types with the letters and numbers of the same type. IE 2SC 1220 or STK 589.
SOURCE: Marantz Pm-7200 left channel weak compared to the right
hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.
SOURCE: I have a Marantz PM-66SE Ki amp which appears to h...
I have exactly this same problem with my Marantz PM60100SE - one of the channels seems to have lost power and is much much quieter than the other one.
Did you find a solution to this? Anyone have any ideas?
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