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Old 2nd December 2006, 05:23 PM   #1
Jonhny is offline Jonhny  Sweden
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Default Marantz SR5400 schematic

Does anyone have a schematic for the Marantz SR5400 amplifier? One channel only puts out treble. I tried connecting an extra amp to the pre out, but still only treble. Must be something with in the preamplifier, right?
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Old 2nd December 2006, 07:35 PM   #2
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Jonhny
I would have to agree.Could be just some dirty Tone ,volume or function select controls. You may not need a schematic but they are good to have if cleaning the controls doesn't remedy the problem. Does the marantz have a tone by-pass switch? Engaging it would by-pass the tone control circuit and give you a output straight thru the flat amp to the power amp. This would help narrow down the problem area. Look the preamp sections over for electrolytic capacitors that have swelled up or split open or gotten hot and shrunk down the plastic label sleeve. Isn't troubleshooting fun ! Great stuff .
Good luck Dave
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Old 3rd December 2006, 12:13 AM   #3
Jonhny is offline Jonhny  Sweden
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Thanks, we tried the bypass-function, but with no difference. It should bypass DSP or whatever is in the path. Is there much left besides volume then?
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Old 3rd December 2006, 02:30 AM   #4
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I didnt realize this was a multi-channel surround sound reciever/processor. Have you tried any of the other processor modes. I suppose you have already tried just plain" jane" stereo mode. Which channel are you having problems with?This could very easily be a processor malfunction . It is probably all digital switching so that kinda eliminates a dirty switch, You could try cleaning the volume control if its accessible.Anything beyond that a service manual is going to be a must have. That and a real strong background in digital techniques.
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Old 3rd December 2006, 12:30 PM   #5
awpagan is offline awpagan  Australia
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I have a SR5200 working ok at present.
did look inside to see what mods could be viable.
It does have possibilities

I have ordered the manual last week, just waiting for it now.

Should be similar to the SR5400 i think.

Which channel is playing up?
From digital in and analogue in?

It uses CS4391 * 4 DAC's, CS493263 DSP, TC9459F Volume control ic.

Could make a decent surround preamp.
power amp side is pethetic.

allan
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Old 3rd December 2006, 03:34 PM   #6
Jonhny is offline Jonhny  Sweden
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Left front is the faulty one.
It doesn't work regardless of input mode.
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Old 3rd December 2006, 07:58 PM   #7
awpagan is offline awpagan  Australia
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I took the cover off mine a couple of weeks ago
from memory (which is not good)
Didn't take the pcb's out.
It has one pcb for preamp in and out.
Couldn't see which opamps it used but probably uses them for buffers in/out and a digital volume chip.
Saw a lot of small electrolytics on the pcb, probably one of these.

when i rec manual will post back with more info

If problem with analoge in also.....
doesn't sound like dac dsp or digital side.
just simple preamp prob, eg bad cap, earth etc?

allan
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Old 15th December 2006, 03:05 PM   #8
Thomo is offline Thomo  United Kingdom
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I have SR5300 schematic - they are the same circuit I think... I will send to anyone who wants it.
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Old 15th April 2008, 12:46 AM   #9
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do you have SR5300 service manual? my inputs are slightly damaged due to lightning so I'd like to try a repair.
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Old 15th April 2008, 08:04 AM   #10
Thomo is offline Thomo  United Kingdom
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I do, but it is a large file and won't email. I will upload it to my website for anyone to download.

http://www.diyhi-fi.co.uk/PDF/Marantz%20sr5300.pdf

Cheers, Lee.
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