Hi All.
I have a Luxman DZ-112 Cd Player in good condition with the exception of the erratic disc tray.
When you press the "Open" button, 80% of the time the tray opens, and then immediately closes.
When I persist, I'll be lucky for the tray to remain open.
Apart from dust, an inspection of the internals doesn't show up anything obviously damaged. The rubber belt appears in good condition and the light lubricant on the plastic cog hasn't dried up.
I was hoping for suggestions as to the likely cause and remedy of the problem.
Cheers
Cliff
I have a Luxman DZ-112 Cd Player in good condition with the exception of the erratic disc tray.
When you press the "Open" button, 80% of the time the tray opens, and then immediately closes.
When I persist, I'll be lucky for the tray to remain open.
Apart from dust, an inspection of the internals doesn't show up anything obviously damaged. The rubber belt appears in good condition and the light lubricant on the plastic cog hasn't dried up.
I was hoping for suggestions as to the likely cause and remedy of the problem.
Cheers
Cliff
Most likely the micro-switch is giving issues. How old is the unit? I have had CD-ROMs and DVD re-writers give issues like this within 6 months of installation. And I don't use the eject buttons a lot. This is most often the most inexpensive electrical/electronic part installed.
I agree. Microswitches are a common issue across all makes and models.
Same issue here:
Sony CDP790 and KSS240 Restoration Project
Same issue here:
Sony CDP790 and KSS240 Restoration Project
Great reference Mooly.
I've unscrewed the CD disc tray with its accompanying circuitry but left the cables in place.
I'm currently getting the tray to stay open about every sixth try.
The rest of the time the tray returns immediately upon hitting the fully open position.
I've gone over it giving the parts a good clean with ear buds.
I know I need to identify and work on the micro sensors, but can't identify them.
Do these shots capture the sensors?
I've unscrewed the CD disc tray with its accompanying circuitry but left the cables in place.
I'm currently getting the tray to stay open about every sixth try.
The rest of the time the tray returns immediately upon hitting the fully open position.
I've gone over it giving the parts a good clean with ear buds.
I know I need to identify and work on the micro sensors, but can't identify them.
Do these shots capture the sensors?
Attachments
I can only see what looks like two? proper switches on the left of those first images (on the PCB) and also something next to it with orange and yellow wires going to it.
Those on the board might be worth a soak in cleaner.
If in doubt then look at the circuit diagram and identify the tray switches that way.
Those on the board might be worth a soak in cleaner.
If in doubt then look at the circuit diagram and identify the tray switches that way.
36 years is a darned good life for a micro-switch. Though your post prompted me to do a search for the unit. In the pictures of it, the button appears to put the micro-switch on the same PCB as the display and control buttons. So rather remount the drive, and see if the front bezel can come off. Else you may have to get the peripheral PCB off from inside to get to the micro-switch. Good luck - I presume that the remote does not have an eject function? If there is one.
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Hi F.
If I find the micro switch, what would the next step be?
Do I clean it, or replace it?
thanks
Cliff
If I find the micro switch, what would the next step be?
Do I clean it, or replace it?
thanks
Cliff
Hi Cliff,
That's a tricky question. You may be able to clean it as Mooly suggested. If possible use some 70% isopropyl alcohol on a Q-tip and drip some onto the micro-switch, and then blow it out with a compressed air can. Or if you have a contact cleaner try that first. These have additives designed to combat gunk build up. However if the micro-switch is faulty, you may have to identify the type it is and try and source it from Mouser, RS Components or Digikey. If you can get a picture of the switch post it here and we may be able to help identify the type.
Regards, Kevin
That's a tricky question. You may be able to clean it as Mooly suggested. If possible use some 70% isopropyl alcohol on a Q-tip and drip some onto the micro-switch, and then blow it out with a compressed air can. Or if you have a contact cleaner try that first. These have additives designed to combat gunk build up. However if the micro-switch is faulty, you may have to identify the type it is and try and source it from Mouser, RS Components or Digikey. If you can get a picture of the switch post it here and we may be able to help identify the type.
Regards, Kevin
The part number is : 40T71025F01
This should be a direct replacement:
https://www.pacparts.com/image.cfm?type=clr&mnum=820&img=40T71025F04--jpg
This should be a direct replacement:
https://www.pacparts.com/image.cfm?type=clr&mnum=820&img=40T71025F04--jpg
This is my next challenge.
Finding the microswitch.
Would it be near the cd tray and does it trigger when the tray nudges it?
thanks
Cliff
Cliff, as Mooly also suggested look at all the micro-switches on the mechanism as well. It could easily be one of those that is triggering the loading sequence.
Without the actual player in front of me it will be extremely difficult to troubleshoot the problem.
Is there no reliable repair shop in your area?
Kevin
Without the actual player in front of me it will be extremely difficult to troubleshoot the problem.
Is there no reliable repair shop in your area?
Kevin
As Mooly has stated earlier the two switches OPEN/CLOSE are on the small board on the left on your pictures. Colour coded leads: orange,yellow,green and the limit switch has the colour coded leads : yellow,orange.
Attachments
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I really appreciate everyones input.
I've carefully re read the posts and was able to identify the switches and clean them.
Before cleaning the cd tray would fail approx 6 times before it remains open.
After cleaning the cd tray now fails approx 2 times before it remains open.
Big improvement.
What should I try next.
Thanks
Cliff
I've carefully re read the posts and was able to identify the switches and clean them.
Before cleaning the cd tray would fail approx 6 times before it remains open.
After cleaning the cd tray now fails approx 2 times before it remains open.
Big improvement.
What should I try next.
Thanks
Cliff
You have pretty much confirmed the diagnosis by saying it is much better after cleaning the switches. You could try removing the switches and soaking them fully in cleaner while operating them many many times... or replace them if that fails to work. Not really much else option wise 🙂
Would I have to carefully de solder to remove them?
Can over heating from an inexperienced solderer cause damage from over heating?
thanks
C
Can over heating from an inexperienced solderer cause damage from over heating?
thanks
C
Its probably the best way but they are small and plasticky and so would need great care to quickly remove them.
You could try soaking the board but the danger there is that any lacquer on the PCB may dissolve and contaminate the cleaner... although you could always repeat the process a few times.
You could try soaking the board but the danger there is that any lacquer on the PCB may dissolve and contaminate the cleaner... although you could always repeat the process a few times.