Bad DC Motor In Sony Hi-Fi
This Sony Hi-Fi came in for repair with the complaint of tray can’t be opened even though the front button already been pressed. The display showed open mode but there was no movement from the tray. I opened the cover and head straight to the connector to check on the voltages. All the signals were printed on the circuit board which was easy for me to perform the voltage testing.
The voltages that I intended to check were the 9 volt and 3.3 volt-see the two photos below:
The 9 volt and 3.3 volt DC were checked to be good.
The 9 volt is the supply voltage to the main CD tray motor.
I applied an external 9 volt to the DC motor and it did not rotate at all and confirmed spoilt.
I searched from my compartment and found a used DC motor but working and fixed it the could open now.
Conclusion- It was a pretty straight forward repair. Assuming if there is no 9 volt DC then I have to trace backward and see where the 9 volt had gone missing. But in this case, it was just a motor fault. Ok see you again in the next repair article.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.
P.S- If you enjoyed reading the above article, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
Note: You may check out previous post about fixing active speaker in the below link:
https://www.electronicsrepairfaq.com/overheated-6-watt-2-channel-power-amplifier-ic-cd4440
About admin
Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
9 comments on “Bad DC Motor In Sony Hi-Fi”
Leave a Reply
Leave a Reply
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Good and fast Pro repair!
You are very famous for your direct root cause fix! Shows the inborn talent, well nourished and maintained! All the very best!
Thanks ! Mr Parasuraman,
Is the tray as filthy as it looks in the pic? That is one dirty-looking tray and can only imagine how dirty the insides are!
dear mr. jestine why there is no like icon in some of the Articles????
Hi Doraiswamy,
Because I do not want to overload this website by putting in more plugins. Plugins can slow down the speed of loading a website.
Jestine
Great article, straight to the point. Always like to see used/old equipment repair. Not like here in the USA, they tossed their electronic devices and go to the store to buy a new one. Not knowing that a simple part that probably cost less then $2.00 US Dollar can fix the issue. Like many here, I go around the neighborhood to pick up electronic devices for parts, or fixing it for resale. Few months ago I found a Samsung HDTV outside. I stopped and checked the cosmetic part. The owner came out and said that it quit working and asked permission to take it. Next day I found out that the problem was a capacitor in the power supply section. I fixed the issue and it is sitting in my room. I admire my colleague from other countries how resourceful you all are! Keep them working and bring more article. Good Luck!!!!
Joe
JGA Electronic Repair Center
Central Florida
Very true Joe! I love collecting electronics that do not work and fixing them or getting the parts. Norm
I was wondering how to troubleshoot an old stereo console I have, that does not power up at all. I do not know where to begin probing with my multi tester and how to test with power on or off.