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Old 25th August 2013, 01:34 AM   #1
slownlo is offline slownlo  United States
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Join Date: Jan 2004
Location: Windsor Mill, MD
Default another Onkyo Integra DX-7500 Question

Found a DX-7500 in a yard sale today. Paid $5 for it...
Cosmetically its in very good shape...I see ones like it selling for $300 elsewhere.
Plugged it in expecting issues...and there are some.
Transport needs lubing, doesn't open or close all the way without a little help... easy enough.

My question is around a clicking (relay?) sound coming from the mainboard and a Diode that goes off/on in response to the clicking. There are 2 of them on the MB (D104 & D106), and its the left one (D104) that goes off/on in time with the (what I will call a relay sound) relay click sound... In looking at the service manual, these diodes (FCNE-S-001G) are part of a Photo-Coupler circuit. I also notice that when the diode is lit, the CD is assumed being read (track counter is moving), with the click sound, the diode goes out and the track counter stops.

I'm trying to save myself some trouble shooting if anyone else has had this happen and know what the offending component(s) is/are. Is it an issue with Q124 (TLP5212GB) or the diode itself?....or something else?

I've attached some pics for reference. any help is appreciated!
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File Type: jpg Pic 3.jpg (821.2 KB, 128 views)
File Type: jpg Pic 2a.jpg (473.2 KB, 117 views)

Last edited by slownlo; 25th August 2013 at 01:40 AM.
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Old 25th August 2013, 02:42 AM   #2
slownlo is offline slownlo  United States
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Join Date: Jan 2004
Location: Windsor Mill, MD
The noise is actually coming from the 2 x relays on the power supply board. They are going on/off at random for some reason...
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Old 4th November 2013, 01:16 PM   #3
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Join Date: Nov 2012
Default onkyo 6570


I have the same issue.
did you find the problem? could it be the servo or the diode laser?
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Old 16th October 2015, 05:02 PM   #4
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Io ho avuto lo stesso problema e l'ho appena risolto mediante la pulizia della lente e la calibrazione del laser (ho regolato con il trimmer la resistenza portandola da 930 ohm a 870 ohm)
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Old 16th October 2015, 05:14 PM   #5
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Join Date: Jan 2004
Location: Near Vancouver

Quando la pubblicazione in un'altra lingua necessario anche inserire in inglese.

When posting in another language you must also post in English.
Thank you.

Google translate:
I had the same problem and I just solved by cleaning the lens and the calibration of the laser (I adjusted with the trimmer resistance increasing it from 930 ohms to 870 ohms)
planet10 needs your help:
Let's help Ruth and Dave
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