Marantz reciever - static once per day

fongs · Guest

Then u could be having a bad transistor, dying up capacitor or bad grounding somewhere. Unlikely to be the "dirty pot" problem. I doubt the contact cleaner will help.

U may need to do signal tracing to 1st identify if it's the power amp or pre-amp problem.

1. Do u see the same problem if u line out to another amp/ receiver? U can line out by connecting the 'Rec Out' or 'Tape Out' of this amp to the line in of another. U may need to switch the 'Tape Monitor' on.

2. Do u hear the 'static' if u turn the volume to '0'?

If #1 is 'yes', u r likely to have a faulty pre-amp. If #2 is 'yes', it's likely to be the power amp fault. Smile

Mozgus · Joined: 25 Jul 2006 Posts: 9

fongs · Guest

Good to know that... perhaps the set has dry joint in some components??

I'd re-solder the power amp section especially the power transistors. These generate lots of heat when in operation. The soldering joint maybe bad.

Mozgus · Joined: 25 Jul 2006 Posts: 9

fongs · Guest

Both methods should work. I personally like to re-solder with new solder.

Smile

Guest · Posted: Thu Aug 10, 2006 3:50 am Post subject:

Hey guys! I still havent gotten around to messing with it yet but I just realized something odd about the static which might be helpful in figuring out the exact part which is at fault! Hear me out.

Ok I have digital buttons for controlling volume. Now I was listening to the static at different volume levels. I noticed that at 0% volume, there is 0% static, however when I raise it, the static raises too.

Now here is the weird part. Once the volume reaches about 20%, the static goes completely mute! Now as I continue to raise the volume, the static raises again with it, and then at about 45% volume, the static dramatically drops down to a faint noise. I raise the volume/static more, and at 60% the static drops again. Then at 80% volume, the static goes COMPLETELY mute again like it did at 20%, and it remains gone for the rest of the volume scale.

So with this knowledge, what component do you guys think is at fault? This kind of reminds me of a gear system in a car or a bicycle and I was wondering if the volume in this thing operated in a similar way?

Mozgus · Joined: 25 Jul 2006 Posts: 9

Sorry, that last post was by me.

fongs · Guest

Hi,

The contact spray wouldn't work if yours is using digital volume control.

Could be due to bad volume control IC...? U wuld need the schema to locate this IC.

Guest · Posted: Sat Sep 22, 2007 9:43 pm Post subject:

I have the unit you're talking about, and your best bet will be to open it up, and check for any blown up or popped capacitors. Next, unscrew the fuse, and reseat it. Set the clock and move the slider on the bottom to off. And repaint the corney flames... its vintage not punk. what are you using to input the the reciever?