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Onkyo CR-305TX PSU FAult
Onkyo CR-305TX PSU FAult
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Old 13th January 2015, 09:16 PM   #11
mrwizard is offline mrwizard  United States
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Smile Thank You Sooooo Much

I had the same problem ... replaced C913 ... and it is alive once again!

Thank you !
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Old 17th February 2015, 06:34 PM   #12
dvdavide is offline dvdavide  Italy
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Hello,
I wanted to confirm that replacing C913 fixed the problem here too.
Thanks to the member who posted the solution.
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Old 27th April 2015, 03:04 PM   #13
Scarciglian is offline Scarciglian  Italy
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I replaced the capacitor, and it works.. Thanks to the member who posted this..
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Old 8th July 2016, 11:47 PM   #14
GoranN is offline GoranN  Sweden
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Thanks for the tip :-)
It worked for me to change the capacitor C913. This seems to be a common fault on this model. It's probably a good idea to scale it up to a 105 degree 63-100V instead.
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Old 20th December 2016, 02:05 AM   #15
jimpkarl is offline jimpkarl
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Default Different issue - distorted audio

Mine has distorted audio in preamp stage, both channels. See attached schematic portion. Audio is loud and clear going into pin 5 of Q403 & Q405, but pins 6&7 (on both) are extremely low and highly distorted. Thoughts??
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File Type: jpg Onkyo_CR-305TX.jpg (299.7 KB, 61 views)
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Old 20th December 2016, 03:43 AM   #16
PRR is online now PRR  United States
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Location: Maine USA
Disconnect one end of C429. Does pin 7 now give signal? Then problem is a short past that point. (But not much there, unless the mice have been storing pennies on the Volume pot lugs.)

Shorted C413, but 100p caps don't short. Also you say both channels? Has to be something common to both.

DC voltages at NJM4565 pins? Decent or dubious?

A dead NJM4565 seems very very unlikely, but if nothing else comes to light, it is going that way. TL072 is probably a fine replacement, just to check and maybe forever. (Wait-- the gyrator at Q403 2-3-1 has a 680r, which is a bit low for TL072, which may be why a NJM4565. Still, audio should pass no-fault when the Loudness(?) feature is not selected, and small-fault when it is.
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Old 20th December 2016, 04:37 AM   #17
jimpkarl is offline jimpkarl
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For purposes of following up on your post, I'm usuing even number (right side) component testing - only because that side is easy to access on the board without requireming me to fully remove the board...

Yes problem is on both channels.

So disconnect C430 shows no change. EXCELLENT debug tip though to cutoff the following part of the circuit. I will file that under "always remember this tip"!

Voltages on NJM4565 are as follows:
Pin 1 13.2V
Pin 2 13.2V
Pin 3 83mv
Pin 4 -133mv
Pin 5 53mv
Pin 6 12.5V
Pin 7 13.1V
Pin 8 13.8V

Some minior variations around those reading depending when I took them, but no more than .5V on the big ones.
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Old 26th January 2019, 09:14 AM   #18
Weka is offline Weka
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Although this tread is quite old. It's still valid. I bought a dead unit for €10.--
replaced C913 with a 47u/50v and it works.

Thanks a lot guys.
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Old 21st October 2019, 07:13 PM   #19
achuMD is offline achuMD
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Join Date: Oct 2019
Default fixed?

this is rather old thread but did you fix the unit? Mine has just done that and I have not been able to trouble shoot the board. BTW my CD quite working all of a sudden too.
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Old 1st November 2019, 09:28 PM   #20
hpha is offline hpha
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Join Date: Nov 2019
Although this tread is quite old, this is still a valuable tipp.
... out of a sudden my ONKY CR305 was dead.
I replaced Capacitor C913 (did cost 0,22 €) with a 47u/35v and it works.
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