Bad Capacitors And Eye Unit Found In Onida Dvd Player
MAKE AND MODEL: Onida DVD Player Model DFX-8520
PROBLEM REPORTED: Dead
TROUBLESHOOTING AND RECTIFICATION DONE: Opened and cleaned the set thoroughly. Dismantled the whole unit and did thorough cleaning of the mechanism, front panel and all boards. Noticed a lot of dry solders. ESRs of the caps were out. So, replaced all the electrolytic capacitors on the boards including the mother board. Did a patch up of all dry solders. Lubricated the moving parts of the mechanism using silicon grease. Lubricated the connector sockets with switch cleaning oil. Replaced the strip wire of the eye unit as it was found to be strained. Opened and cleaned the Original Remote Control, though there was a duplicate bought for it by my brother, to whom this DVD player belonged to.
Checked and found that the original RC Unit was functional. Interconnected the boards and checked for function. The error shown was ‘No disk!’ I repeated cleaning the eye unit but in vain. It was a clear cut case of bad eye unit. So, replaced the eye unit. I had to then adjust the spindle height by pulling it out and pushing it in in order to make it in exact position. This is a laborious task, as each time, the protective cover-cum-CD holding unit has to be taken out. Finally, it was in place and the player started reading the disks and playing very well. Allowed a few DVDs, VCDs and CDs play in full. This is to ensure that the sliding motor works flawlessly. After ensuring that the player was functioning very well in all respects, assembled the boards back to the unit for further trials. Mission accomplished and got added to the ever growing, but self-readjusting satisfaction bag.
HERE ARE A FEW PICTURES:
This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below:
https://jestineyong.com/corroded-tracks-and-bad-capacitors-found-in-sharp-two-in-one/
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Albert van Bemmelen
August 8, 2020 at 1:14 pm
After reading: "to ensure that the sliding motor works flawlessly", I guessed you wrote it dear Parasuraman! The part where you wrote "I had to adjust the spindle height by pulling it out and pushing it in in order to make it in exact position", is not clear and could have been pictured in more detail.
Parasuraman S
August 8, 2020 at 11:25 pm
The focal distance of the lens should be within the specified limit. Like adjusting the azimuth of a tape recorder head, the position of the spindle which holds the CD at a fixed height should be adjusted to bring it within the reading focal position. The spindle may have to be lifted up or pushed down by trial and error method. In the factory, this is set by using alignment instruments. Hope it's clear now!
Yogesh Panchal
August 8, 2020 at 3:38 pm
God job! sir
Parasuraman S
August 8, 2020 at 11:26 pm
Many thanks!
Waleed Rishmawi
August 8, 2020 at 10:16 pm
As always splendid repair job
Parasuraman S
August 9, 2020 at 10:19 pm
Many thanks dear friend!
Raj
August 9, 2020 at 6:32 am
Great.. Yes, if possible, can share photos of spindle height adjustment. Always a challenge to fine tune this cd mechanism.
Parasuraman S
August 9, 2020 at 10:19 pm
Very true! We need a lot of patience!
Humberto
August 9, 2020 at 12:38 pm
Good repair. Somedays ago I had to use your e-caps method: the SMPS of my PC was behavioring in a erratic way, and the ESR of most of the e-caps was out of range, so I decided to replace all of them, and the SMPS has been working fine till now.
Parasuraman S
August 9, 2020 at 10:18 pm
Yes, replacement of E-Caps in SMPS is a must! Many thanks for sharing your experience.
Satheesh rao
January 11, 2021 at 1:51 pm
From where to get the eye unit? I have sane DVD player but shows no disk. Any model no for eye unit? Pls share info.
Parasuraman Subramanian
February 23, 2022 at 12:11 pm
Check the number written on the eye unit and try to fetch it from elec. spare shops. It is better to remove the eye unit and show it as a sample.