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Anthony F.
Anthony F., Camera and Video Technician
Category: Camera and Video
Satisfied Customers: 9830
Experience:  Experience with repair of equipment used in TV and film production and owner of TV service center.
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Samsung DVD R149 Recorder Has a DVD Mech AK97-01883b I Have

Resolved Question:

Samsung DVD R149 Recorder Has a DVD Mech AK97-01883b I Have several of these recorders which have all had their mech renewed do you know what fails on these can't get any info from samsung only thay say we have very little trouble with them? You now see that thay are no longer avialable (AK97-01883B) But got AK97-01747D sent for a replacment but not working in DVD R149 Recorders Fault Not accepting discs can anyone
help
Best Wishes
Colin Barlow BA(Hons) Elecronics
Submitted: 2 years ago.
Category: Camera and Video
Expert:  Anthony F. replied 2 years ago.

Anthony F. :

This is the part you need

Anthony F. :

The other part will not work

Customer:

Hi Anthony

Customer:

Many thanks for your answer but I tried to order from the company you suggested but they cant del to me in south yorkshire? tried two or three times I have replaced these mech many times they are easy to replace But no one seems to know why they fail? any ideas because samsung do no longer supply to dealers ie. Martin Daws one of their service centers they have just fitted me one an AK97-01747D mech witch I supplyed from Charles Hyde (CHS) and got it working today 29/3/14 but they do not know why they fail?

Customer:

Best Wishes

Customer:

Colin

Customer:

PS please let me know if you can cum up with an answer

Anthony F. :

Lasers fail for 2 reasons

Anthony F. :

1 internal failure of the laser of the sensor array the laser is reflected back and picked up by six sensors wich position the laser for proper read...a failure of one of the six and the unit can no longer focus or track

Anthony F. :

2. DUST

Anthony F. :

Dust builds up inside the laser head and under the lens on the prism inside this lowers the the effective output until it reaches a point where it no longer can function ..

Anthony F. :

since the dust is UNDER the lens you cant clean it

Anthony F. :

without dissasembly of the laser head and you cant do that becuase you will never get it back together

Anthony F. :

I have had limited success with compressed air under the laser lens ...

Anthony F. :

and sometimes if its on the hairy edge you can turn up the laser power with the pot on the laser to give it just a little more works in case where the laser is a little weak and not reading reliably but works

Anthony F. :

and

Anthony F. :

3. cracked gears

Anthony F. :

that move the sled down the line as the data is read the motor moves 1/4 turn to track the laser into the disc and a cracked or dirty gear willl cause it to stick and not read you can watch the laser read it will spin 1/4 turn every few secs if it stops it will soon mistrack as the laser reaches the end of its play inside the housing and no longer the read the data without moving the sled ...the servo will send a harder pulse becuase it knows it needs to move that thing and sometimes if it breaks free will cause an overshoot and the unit will stop playing /rec and reorganize it self back to where it should be .. this results in a drop out

Anthony F. :

Good luck ! also be sure the little solder blob across the laser has been removed or it wont work

Customer:

Hi Anthony sorry I am late but had a lot to do I have done all you have suggested befor but never hade any sucsess

Customer:

Hi Anthony sorry I am late but had a lot to do I have done all you have suggested befor but never hade any sucsess but thanks for your input Best Wishes Colin

Anthony F., Camera and Video Technician
Category: Camera and Video
Satisfied Customers: 9830
Experience: Experience with repair of equipment used in TV and film production and owner of TV service center.
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