Marantz 2245 crack and pop on Left speaker - diyAudio
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Old 8th January 2010, 11:59 PM   #1
yklou is offline yklou  United States
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Default Marantz 2245 crack and pop on Left speaker

Hi,

I recently purchases a Marantz 2245 reciever for a day, i found them sound warmer and a lot more to my liking. However, on the second day, after I have tried to losen up the potentiometer of the front controls, the amp starter to crackle and pop on the left and channel. The right channel is perfectly ok. The crackle and pop is not affected by the volume adjustment. I told it in to a local tech for service as the lamps were all out too. He cleaned the unit up pretty good, but just cannot figure out the component responsible for the noise. He said it most likely to abe a transistor on the tone board. He returned the unit back to me with a in-line lamp fuse to prevent blowing my speakers. After it happened twice, I call him and he said, he will just replace all the transistors on the tone board and it will run approx. $60, but can't guarantee it will fix the problem. As I have already speed $70 + cost of amp, I would rather try fixing the unit myself. I have tried cleaning the tone pots with a contact cleaners and they turn really smooth and the in-line fuse has not blown the fuse for almost two days of continous use. today it just blown the fuse again as it started to crack and pop again. Can anyone tell me is if the tone board is the most likely problem. I have check the service manual and the transistor required are the 2SC1000 GR OR b1 AND 2SC493 Y OR GR. I cannot find them anywhere, i think they are discontinued. I have found some NTE 290A and NTE 199. Are these the right replacement or can someone suggest something more suitable.

Mike
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Old 9th January 2010, 12:40 PM   #2
djoffe is offline djoffe  United States
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Default Can you post the schematics?

If you can scan and post the schematics, we might be able to steer you in the right direction. The fact that the volume control has no effect on the crackling is a good hint.
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Old 14th January 2010, 01:51 AM   #3
yklou is offline yklou  United States
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Here is a link for the schematic and the service manual

Marantz 2245 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

Mike
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Old 14th January 2010, 10:51 AM   #4
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its a total fact that every small electrolytic inside this amplifier needs to be replaced

there is no question if this one or that one its simply one word ALL !!!!!!

otherwise you will never manage to make it operate properly

the particular amplifier has plenty coloured grey and coloured orange ...the orange ones should be elna sealed type and these and only these caps might still be ok after 30 years

this amplifier beyond the amplifier power supply has also a seconadary power supply that feeds preamplifier and other auxiliary circuits this particular circuit needs a total replacement of caps if not other issues

in the amplifier boards there is also not only filters and decoupling elctrolytics but also some that are related to signal issues that need a replacement

then again the same goes for all prealifier boards

Tuner sufers from the exact same problem and you will see frequency shifting on tuner section also .....

doing this is not the only thing you need to do you need to clean very very carefully all pots and switches

the strange thing is that this will probably cost you between 10-20 usd in parts timewise though is a very time consuming job to do

here is some extra help vintage amplifier repair/upgrade manual
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Last edited by east electronics; 14th January 2010 at 10:54 AM.
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Old 19th January 2010, 06:06 PM   #5
yklou is offline yklou  United States
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Thank you for the reply. I have tried to com firm where the problem is. In the last few days, I have used the Marantz 2245 as a pre-amp and as a power amp. In the pre-amp mode, the unit still pop and blow the 1 amp fuse on the left speaker. As a power amp, it has no problem at all. I therefore have decided to start with the tone board (P400). If this eliminates the problem, I will then continue to upgrade the parts on the other board.
On the Tone board (p400) I decided to change all the transistors and the capacitors. I have located most of the parts. However I do have a concern with the tolerance of the following:

C405-C406 Elect., 10μF, 35V, +100%, -0%
C409 Elect., 100μF, 35V, +100%, -0%

I presume I can use

Elect., 15μF, 50V, +/-20% (giving 13.50μF to 18μF)
Elect., 150μF, 50V, +/-20%(giving 135μF to 180μF)

These are all NTE brand and they are the closest values my local electronic store stock. Should I go ahead and use them or should I get something more suitable from Mouser (perhaps you can suggest more suitable capacitor if the above is not suitable). Until I find the problem, I am trying to keep cost low. I don't mind using these first and them switch them out later with better and suitable one.

Michael
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Old 21st January 2010, 04:51 PM   #6
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i have no trouble answering e mails also if i can help in this field that i have a lot of expirience i am more than happy to

on the other hand the manual i have composed is simple enough for any one to understand

also if you look at my previous answer you will notice that i say that you need to replace all small electoryltics inside ...no if ....no why ....just replace them all

for a machine like that there is no question ... what is the point to replave the tone control caps when secondary psu caps are all history and belive me you need more that psu caps than the tone control caps

yet again ther is no way that you will ever manage to operate this amplifier if you replace any tranistor with NTE ..... you will destroy a classic amplifier and make it a ticking bomb ....

kind regards sakis
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Old 21st January 2010, 07:18 PM   #7
yklou is offline yklou  United States
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Thank you for the reply here and the email, especially on the tolerance. It makes finding parts alot easier.
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Old 21st January 2010, 09:36 PM   #8
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Input differential pairs are troublesome on this model (and similar models) and should be replaced with a new matched pair.
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Old 26th September 2013, 07:24 PM   #9
tongwi is offline tongwi  Canada
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Hi Mike,

I got Marantz 2245, and have the same problem with crack and pop on right speakers.
I located the P400, and guess there is a problem on transistor. Did you manage to fix your problem? If yes, can you let me know the detail please?

Thanks!

William
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