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Trouble with Marantz 2226b

TobiasHuse

TobiasHuse

New Member
Hi! Im new to the forum, so I hope I've posted correctly.

Im having trouble with my daily driver (and only reciever), a Marantz 2226b. Bought it refurbished about 4 years ago, and have never had a problem with it until this week.

I can use a soldering iron, and have repaired electronics before, but this is a bit too complicated for me. Im hoping someone can point out where the problem is located.

Loud popping and crackling in the left speaker. If I switch speaker outputs the popping appears in the right speakers, so the reciever is the problem. The secondary output from the reciever is also noisy, so the problem is not in the output ports. If I press the Tape 1 monitor button, Mono or Loudness, a loud pop is heard from the left speaker. The volume of the pop is relevant to the volume knob. Turning the volume knob also produces some crackling from the left speaker. The Low and Hi filter buttons don't make any noise.There seems to be the same amount of pops, both in volume and frequency, in both the Aux input (connected to a television) and from the Tape 2 input (connected to a phono-preamp and a Technics 1210). The popping comes at random, then disapears again. I can always produce it by wiggeling the controls. Turning the EQ-knobs changes the EQ of the pops (sounds like they are mostly in the bass).

The unit has not been recapped or serviced while Ive owned it.
Noise appeard in all the knobs at the same time (sometime during the last few days), so I dont this its an issue with dirty pots (I've also tried to clean them with contact cleaner without any results).

Bad transistor somewhere?

Here is the service manual. https://www.audioservicemanuals.com/m/marantz/marantz-2226/459031-marantz-2226-b-service-manual


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You have some small signal transistors (NOT the outputs) gone noisy. Click the "Report" button in the lower left corner of your post and ask a mod to move this to the Marantz section.
 
tarior said:
You have some small signal transistors (NOT the outputs) gone noisy. Click the "Report" button in the lower left corner of your post and ask a mod to move this to the Marantz section.
Click to expand...

Now it suddenly went fine for a good half-hour. No popping, noise or anything. Even when pressing the buttons. The input selector-knob was also popping before, forgot to mention that in the top post. But now, totally clean. Then suddenly the popping came back, and pressing the loudness/tape monitor buttons (and input selector/volume) yielded loud pops.

Could this happen with a bad transistor? That it goes "fine" again for a while, and then acts up?
 
Components generally don't fix themselves. If it temporarily "fixed itself" and then went bad again, it is likely a bad solder connection. You mentioned the unit was previously serviced, so it is possible that something was knocked around or dislodged at that time and was barely making contact. If the service involved replacing components, there may have been a bad solder job involved. Take off the cover, and try tapping on components with a wooden chopstick to see if you can find the culprit. Please be cautious when poking around while the unit is powered on. Don't touch anything with your bare hand.
 
My first guess is that you have an intermittent switch somewhere. The push switches are prime suspects, but I would not rule out the rotary ones. It is less likely that there is a bad rotary control such as the volume, balance or tone.
There are also 'switches' embedded in the pre-main outputs on this model.
If this isn't the problem, then I agree with Tarior.

Tom
 
Transistors will sometimes when going bad make sounds like bacon frying.
The loudness switch could be nothing more then dirty another issue.

Use a set of RCA patch cords to swap right left using the preamp to main amp jumpers. If the noise moves then it is the preamplifer section, if stays with the channel then in the amplifier section.
 
Thanks for all the replies! The noise does not remind me of frying bacon. More like a bad guitar cable, so I think it's a bad solder. I'll try RCA jumpers to see where the problem is, and then try bobdod's tip. I'll report back with the results!
 
If when you plug the patch cords into Main In / Pre Out and it clears up the problem most likely is in the internal contacts between the two as Catrafter mentioned. Use some contact cleaner on the tips of your RCA male pins and work them back/forth In/Out with a couple applications of cleaner.
 
Also, (this may sound super rude... but), make sure your speaker wire connections are tight at the amp as well as the speaker. (from personal experience) :)
 
jd3rdcoast said:
If when you plug the patch cords into Main In / Pre Out and it clears up the problem most likely is in the internal contacts between the two as Catrafter mentioned. Use some contact cleaner on the tips of your RCA male pins and work them back/forth In/Out with a couple applications of cleaner.
Click to expand...

UPDATE: I think the problem was here. I plugged in a pair of jumper cables this morning. Since the popping/problem has been coming and going, its been a waiting game with music running on shuffle the whole day to see if the problem returned. So far so good! I'll go about cleaning this connection.

Thanks for all the help!
 
Okey, so the amp started acting up again.
The Loudness, Tape 1 Monitor and Mono knobs make loud pops when pressed and depressed. The Volume dial scraches when turned and the Input selector dial pops when changing inputs (all the inputs have the same amount of pops and crackles). All only in the left channel. Swapping the channels with the pre-out/main-in ports switches the pops and crackeling to the right channel, so the problem is somewhere before this, but after the input selector I guess.

I tried touching the different parts of the tone-board with a chopstick, but none of the components or soldering yielded any noise when touched.

So, does this narrow it down to a bad transistor in the tone-board?
 
I would start with a good cleaning of all the controls and switches and potentiometers on the front panel then reassess
 
jd3rdcoast said:
I would start with a good cleaning of all the controls and switches and potentiometers on the front panel then reassess
Click to expand...
Yeah, Ive tried, but Ill give the deep cleaning guide here on the forum a go. Could one dirty switch cause them all to go noisy?
 
Look for transistors with part numbers 2SA725/726/750. Those should be replaced always as a matter of course. KSA1015 is a good replacement for them in that receiver.
 
tarior said:
Look for transistors with part numbers 2SA725/726/750. Those should be replaced always as a matter of course. KSA1015 is a good replacement for them in that receiver.
Click to expand...
I see! Should I just replace all the transistors inn the tone/pre-board? There are 2SC1328S and 2SA722S transistors in this circuit. I'm guessing the KSA1015 should work for the 2SA722S. Do you have a recommendation for 2SC1328S replacements?
 
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