All sorted! The Teac rides again
Thanks Gary and thanks DIY Audio forums, think I will stick around and learn some stuff
You're welcome, I translate your gratitude to Extreme_boky that kindly shared the fact that every laser pickup must be trimmed once installed.
Hi all, I wondered if you can help me.
I found this thread whilst looking for a solution to my problem.
As others have said, I too have a Denon DVD 2900 which will not play some RB CDs, it seems to be about 1 in 3 of my collection, which are all in excellent condition.
You can hear the machine trying to read the contents and then giving up with a row of zeros in the display.
I read with interest Extreme_boky's and Gary Krant's possible solution, so I thought I would try it.
Now my trim pots are not side by side but one above the other, apparently the pick ups were modified by Denon and I think I have the older version. It looks like the bottom one is the equivalent to the right hand one(CD).
Anyway, without any test gear, using trial and mostly error I tweaked the lower pot in small increments, clockwise between 1/8th and 1/4 turn, to no avail.
Any suggestions as a way forward would be fantastic as I love the sound and looks of this player and really don't to give up on it.
Cheers
I found this thread whilst looking for a solution to my problem.
As others have said, I too have a Denon DVD 2900 which will not play some RB CDs, it seems to be about 1 in 3 of my collection, which are all in excellent condition.
You can hear the machine trying to read the contents and then giving up with a row of zeros in the display.
I read with interest Extreme_boky's and Gary Krant's possible solution, so I thought I would try it.
Now my trim pots are not side by side but one above the other, apparently the pick ups were modified by Denon and I think I have the older version. It looks like the bottom one is the equivalent to the right hand one(CD).
Anyway, without any test gear, using trial and mostly error I tweaked the lower pot in small increments, clockwise between 1/8th and 1/4 turn, to no avail.
Any suggestions as a way forward would be fantastic as I love the sound and looks of this player and really don't to give up on it.
Cheers
Well, I tried turning both and things were only getting worse. Finally, it stopped reading SACDs whatever the position of the pots. Setting it back to exact same starting position didn’t help either, so I just replaced it with another pickup I had, and now it reads everything. I am very skeptical about touching these pots as this whole process is obviously not meant to be done after the pickup installation, since the pots are extremely inaccessible. And for 6.5 eur for the hole new pickup on eBay, I really don’t see the point.
Hi zdr,
Many head adjustments are very touchy. Forget tuning them for the best play by ear or anything along that line. If they are the laser output power, if you take them to or over the edge, the head is instantly toast and it will never read again.
Please, please, please, do not touch the variable controls in any player! Take it to someone who actually knows exactly what they are doing. If you haven't been specifically trained and do this for a living, no matter how much you think you know, you don't know. There is nothing more dangerous than someone who thinks they know what they are doing. "How hard can it be?" Not too difficult if you have the training and the equipment. Not possible to do correctly if you don't.
-Chris
Many head adjustments are very touchy. Forget tuning them for the best play by ear or anything along that line. If they are the laser output power, if you take them to or over the edge, the head is instantly toast and it will never read again.
Please, please, please, do not touch the variable controls in any player! Take it to someone who actually knows exactly what they are doing. If you haven't been specifically trained and do this for a living, no matter how much you think you know, you don't know. There is nothing more dangerous than someone who thinks they know what they are doing. "How hard can it be?" Not too difficult if you have the training and the equipment. Not possible to do correctly if you don't.
-Chris
Hi zdr,
Those ones are, but there have been countless people who have ignored me and ended up writing off some nice machines because the heads were too expensive or not available. Too cheap to stand back and assess the situation and a nice machine bites the dust and that's what I am trying to save.
The original head, did it have brass sleeve bearings where the rods go through? How about the new head?
To all,
If you can't afford to fix something, sell it so someone else can get it repaired properly. There is not point in wrecking something so no one can have it. It's a real shame seeing nice equipment destroyed by the owner, or a friend "who knows something about electronics". TV and Computer shops are fairly notorious for destroying audio equipment too. Then there is my favorite. "I don't want to spend much because I have already spent $xxx.xx on it so far"! Then sell it! Exactly what does the next poor tech have to do with the history of your machine ... and he has to clean up after someone else who erased all the clues and created new faults in the process. I'm working on a Pioneer SX-1280 like that now. Repaired the negative HV regulator, repaired the traces in the FM section and removed an incorrect chip. Replaced a bunch of missing parts and now need to replace a PA1001-A / KB4437 (missing) MPX decoder and find a PA1002-A / KB4438. The PA1002-A is the actual fault, plus it needs an alignment. The rest was "struck by technician" faults.
-Chris
Those ones are, but there have been countless people who have ignored me and ended up writing off some nice machines because the heads were too expensive or not available. Too cheap to stand back and assess the situation and a nice machine bites the dust and that's what I am trying to save.
The original head, did it have brass sleeve bearings where the rods go through? How about the new head?
To all,
If you can't afford to fix something, sell it so someone else can get it repaired properly. There is not point in wrecking something so no one can have it. It's a real shame seeing nice equipment destroyed by the owner, or a friend "who knows something about electronics". TV and Computer shops are fairly notorious for destroying audio equipment too. Then there is my favorite. "I don't want to spend much because I have already spent $xxx.xx on it so far"! Then sell it! Exactly what does the next poor tech have to do with the history of your machine ... and he has to clean up after someone else who erased all the clues and created new faults in the process. I'm working on a Pioneer SX-1280 like that now. Repaired the negative HV regulator, repaired the traces in the FM section and removed an incorrect chip. Replaced a bunch of missing parts and now need to replace a PA1001-A / KB4437 (missing) MPX decoder and find a PA1002-A / KB4438. The PA1002-A is the actual fault, plus it needs an alignment. The rest was "struck by technician" faults.
-Chris
This might make sense for >1000eur machines, but this thread is about DVD2900 which goes regularly now for under 100eur. I bought another one for 40eur that had both laser and tray problems. I have now two machines in total.
1. Machine 1: I replaced the laser with new laser 1 and it still would not read recorded CDs well, but SACD/DVD-A was fine. I started playing around with trimmers, and it stopped reading SACD/DVD-A. I gave up and placed new laser 2, and it was reading most of the stuff. At least I thought it was.
2. Machine 2 came along, laser was a mess, so I replaced it with laser 1 from above. I repaired sliding gear. It still does not read SACD/DVD-A but reads CD-R like crazy! Much better than non-tweaked laser 2 in machine 1.
I am not going to take any of the 50eur machines to a shop which will charge 200eur for a fix, and still might not repair it. Moreover, spares for DVD2900 are not being produced any more so don't think any serious repair shops would even take it in.
So we are on our own, and this is DIY forum after all, so let's DIY
I am not left with other options but to tweak trimmers on my own, and it seems necessary even with new pickups. Having said that, I would appreciate if someone can point me to the correct trimpot for DVD/SACD
I fixed the second player that would not read anything, without changing the laser. Actually, I bought a dud from aliexpress for double the price of ebay which did not work, so I've just put back the original pickup and adjusted the pots.
I found the way to turn the pots without removing the pickup, which speeds up pot position hunting considerably and also eliminates the risk of electrostatic shock.
I found the way to turn the pots without removing the pickup, which speeds up pot position hunting considerably and also eliminates the risk of electrostatic shock.
Hi, I'm having the same 00:00:00 on my 2900 with all media now. Ordered a brand new HOP1200S laserunit on Ebay. Comparing the old and new I noticed there's a tiny white piece of plastic on the old. Should that be transfered to the new laserunit?
One more question: should I remove the two solderblobs before or after I reconnect the ribboncable?
One more question: should I remove the two solderblobs before or after I reconnect the ribboncable?
An externally hosted image should be here but it was not working when we last tested it.
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