• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Marantz 2215b weak left channel sound

J

Jimc28

New Member
I got a Marantz 2215b receiver at a garage sale. The left channel is playing at lower volume than right channel. This happens through aux and fm inputs. Detoxify all switches and pots, no help. If I switch speaker connections then right speaker is low and left is fine. Any ideas? I hanks
 
Register to hide this ad
If the problem stays with one speaker rather than with one (L or R) channel, the problem is with the speaker. Can you say more what you mean by "weak sound"?
 
Left channel seems normal right channel sound is there at a much lower volume. I have determined it is not speaker and do not believe it is tape monitor switch or other switches or knobs. What else could be problem?
 
Did you work all the switches and controls through their whole range many times as you cleaned them? It can be difficult to get them clean. Do you have a DMM to measure voltages?
 
Last edited:
Try hitting the selector switch a couple times with deoxit and work the knob vigorously. Will surely need a recap, but thank god its a great unit to do and/or practice on. One of the sweetest little receivers ever made.

Also love the use of "deoxify", first time I've seen that!
 
I do have dmm to check voltages. Just looking for some guidance on what to look for. I did print service manual too. New to reading schematics, but want to learn.
 
I'm going to move this over the Marantz forum. Clearly not a tuner issue. An Oscope would be useful to determine if it's a Pre-amp or amp issue.
 
On some of the low powered units, the issue can actually be that the one channel is higher than normal due to an electrolytic cap that is bad. I don't think it's this one but keep that in mind.

You can cheat and short the two amp inputs together as a test to see if the imbalance is what's coming in. Use a jumper wire between J701 and J702. You can also use a pair of needle nosed pliers if they are small as those 2 terminals are close together on the bottom edge.

As this requires the bottom cover to be off, be careful as the line voltage is exposed at the back panel and the power switch and can kill you!
 
I'm assuming you checked that the balance knob position is centered. It could be a lot of things. First step I would take would be to narrow it down to a particular stage. I would start with looking at the power amp board and check the voltage coming in from the power supply (looks like it is same input for both channels so should not be the problem but I would want to check it anyway just to be sure it's good, looks like it should be 53V on J706 if I'm looking at the right schematic) then check signal coming in from earlier stages on both channels (looks like J701 and J702). If the inputs are the same on both channels then the problem is likely on the power amp board or downstream (ex. output transistors or output caps). If the inputs are not the same then the issue is in earlier stages. Just be careful if you haven't done this before, do a bit of research first on how to work safely, otherwise you could easily damage the receiver or yourself ...
 
You must log in or register to reply here.
Back
Top Bottom