Marantz pm7200 hdam, will not power up, checked internal fuses all ok, over rid the internal power-on rely and power amp powers up but pre amp circuit still dead, any idea, power panel look fine but appears to be dead, no sign of burning etc! no lights on amp front panel, amp was working fine the day before without any indication of problems!

ask the repairman what the deal is

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.


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?

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.

http://www.retrevo.com/support/Marantz-PM7200-manual/id/511bh847/t/2/
http://www.fixya.com/support/t409652-marantz_pm_7200
The top link is for a manual for your model. The second link is a Fixya link concerning "no power". I'm not sure why you are looking for fuse but, have to assume it's a no power issue.
http://livesupport.maybenow.com/Marantz
The above link is a support link for Marantz. Hope this helps.

hi,
First of all check the power at the socket to which you have connected the amp.If you are not aware of electronics, then do not go for a test with an amp like KI signature.
it will have a fuse in its inside. its only blow off if there is some fault inside the its circuitry. consult someone who is well equipped for the same.
ok

You can check the fuse with a battery and a bulb. Take the fuse out and use it to make a circuit with some wire, the battery and bulb. If the bulb doesn't light it has gone.
Apart from that other things to check are the power switch, to see if it works and the transformer.
It might be worth buying a cheap Ohm meter, if you haven't got one. You can check most of the parts in the power supply with it. By the way if the fuse has blown, buy a few as you might find it could blow again when you try it again. If it does you are looking at a device (such as a transistor) that as shorted and acting like it was a piece of wire. Which is easily found with an Ohm Meter!

You have either lost the pre-amp stage or the Main Amp stage. Since you have a problem on both channels it most be a part that is common to both channels. Something like an IC I would suspect.

Could be a power supply failure or a Power "On" switch failure.

Kev

Pull cover check for fuses on the bord and replace with exact rating on the fuse.

no! you got shorted or leak capacitors, and change value resistors.