Marantz 2235B running hot - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th January 2009, 08:08 AM   #11
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Default what normally

does that i wrong adjustments and oscillation.....

all your adjustments might be correct and according to the manual but if the values of componets of your amp have been changed cause of age then you have a problem ....

if your caps are old enough that they have obvious external damage then there is no question ..... first you have to "follow the manual "

all caps have to be replaced and since your amp is exposed to thermal stress and age then i would look at resistors to to locate drifting ....
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 9th March 2009, 04:15 AM   #12
mikje is online now mikje  United States
Soakin' up the Sound!
diyAudio Member
 
mikje's Avatar
 
Join Date: Feb 2008
Location: Bismarck, ND
Well, my 2235B lives!
I replaced all the electrolytics, diodes, and transistors on the PS board. That seems to have taken care of my problem. The DC offset is good, and stays good and the heatsink stays cool to the touch.

Now comes the best part... It sounds GREAT. I ran it with a pair of Dayton BR-1's and I LIKE IT!!!

Next project; HK330 with a right channel that's fried (smokes until the fuse blows). This one should be pretty simple. The left channel seems OK, so I'll just compare the two and rebuild accordingly.

Thanks for the input and suggestions.
Mike
__________________
Marantz PM8003 amp, Jolida SJ502A, Squeezebox Touch, MLTL Continuums, DIY Carmichaels (Dayton, TangBand, Vifa); MarkAudio A 7.3 Frugalhorns, MarkAudio CHP-70s
  Reply With Quote
Old 9th March 2009, 08:20 AM   #13
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Default .....

well done !!!!!!

hope it stays like that
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 2nd November 2014, 12:07 PM   #14
Boydk is offline Boydk  Denmark
diyAudio Member
 
Join Date: Feb 2010
Location: Aarhus, Denmark
Default Another Model 2235B

Just to add to the previous success story......
Fixed my friendīs dadīs 2235B today. Boy was it sick, when powering up, no sound at all no matter what input, just a slight humming which became lesser when touching the chassis. Itīs all about cleaning...... the potmeters, the input selector and more. Was running extremely hot (real class A mode) on both channels. New idle- and dc-balance pots. Between the measuring points, the manual says 8mV for idle, was 250mV on left, 270mV on right channel, still wonder why it didnīt blow up. The 35V was the only thing that was just spot on. No suspicious caps, cleaned the big vari tuning capacitor (canīt remember the english word for it ) and adjusted the FM-sensitivity. Now itīs in absolutely perfect working order, and it sound pretty damn good. The owner is picking it up tomorrow, should be fun to see his face when cranking it up to show him the result
  Reply With Quote
Old 3rd November 2014, 08:48 AM   #15
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
No suspicious caps

That was a good joke thanks !!!!
For 2235 at this age you should replace the word no suspicious with the word all suspicious ....
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 8th November 2014, 10:24 AM   #16
Boydk is offline Boydk  Denmark
diyAudio Member
 
Join Date: Feb 2010
Location: Aarhus, Denmark
You are probably right, but the fact is: No lack of bass prerformance, no dc drift, sound is smooth and dynamic at the same time. Sure it would sound different, if I changed all the capīs, but the owner is very pleased.
And if it works, and works well........ Donīt fix it :-)
  Reply With Quote
Old 8th November 2014, 12:16 PM   #17
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Quote:
Originally Posted by Boydk View Post
You are probably right, but the fact is: No lack of bass prerformance, no dc drift, sound is smooth and dynamic at the same time. Sure it would sound different, if I changed all the capīs, but the owner is very pleased.
And if it works, and works well........ Donīt fix it :-)
This approach ( sorry to say ) is very childish
Do you own instruments ? can you verify slew rate and bandwidth ?
can you also guarantee that this amplifier will continue to work after 6 month of everyday operation ?
Since 2009 we have a computerized data base
So we have been repairing 56 Marantz of 22XX series from 2009 till today
Data base and me say that none of the small grey capacitors pulled inside of them operated 100% properly
the small ones up to 10uf presented minor capacitance loss and huge increase of ESR while anything above that like 47 or 100UF expect massive ESR increase presented failure in the capacitance also ..

Free information ...use it properly ...
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 8th November 2014, 12:27 PM   #18
esgigt is offline esgigt  Netherlands
diyAudio Member
 
Join Date: Dec 2013
I agree with East Electronics. Electrolytics that old are almost 100% sure in such a state that they must be replaced.

It's just good advice
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Marantz 2235B Tuner Issue??? mikje Solid State 11 6th July 2009 03:00 PM
running 4 ohm B&O s from 6-8 ohm marantz conor4 Solid State 3 27th June 2008 03:47 PM
What advantages running ported midbass if you are running a sub? mitchyz250f Multi-Way 3 20th May 2008 03:34 PM
Marantz CD80 tray motor is running non-stop Jeph Digital Source 12 8th May 2006 03:23 PM
Right speakers for Marantz PM8000 + Marantz CD67-OSE? betto80 Multi-Way 2 24th May 2005 04:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:44 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2