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Old 27th April 2005, 08:08 PM   #1
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Default Laser Replacement VRDS 10

Hello, Fellas. I've just had to replace the laser assembly in an old Teac VRDS10 (original) and it still won't read discs. I've tried to tweeak the settings using the potentiometers on the servo board to no avail. Sometimes the disc will spin and stay spinning for a few seconds while the laser tries to tead the TOC (then stops) and sometimes the disc will not spin at all.
Has anyone had to set up a player from scratch and knows what those (5) pots do? They are labled 'F-Gain', 'T-Gain','S-Bal', 'T-Bal' & 'F-Bal'.

The Teac uses the same transport as some Copeland, Wadia and Krell players, and the same laser as some Denon and Sony units. If you have one, maybe you can help.

Cheers, Dan.
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Old 28th April 2005, 11:27 AM   #2
Cobra2 is offline Cobra2  Norway
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Exclamation Get the service-manual!

There are a few adjustments that require both signal-generator and oscilloscoope.
Without manual, it is almost impossible.

Arne K
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Old 29th April 2005, 01:47 AM   #3
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Oh. I have nought but a simple multimeter. Do you have any idea what the 'F, T and S' stand for? One controlls the speed of rotation one probably the laser intensity/focus. I have plenty of time on my hands to experiment with different settings but seem to be getting nowhere. Is it possible I have done irrepairable damage to one of the control chips, maybe through static or mishandling?

Dan.
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Old 29th April 2005, 08:28 AM   #4
JohnW is offline JohnW  Hong Kong
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Dan,

Just a quick question if your new to the game, when you replaced the laser head, did you remove the Anti–Static protection “Solder Bridge” on the Head / Flex cable?

This Solder Bridge “shorts out” the Laser diode to prevent damage from static discharge until the head is ready to be installed in the player.

F = Focus

T = Tracking

S? (Servo or sledge)?

John
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Old 29th April 2005, 04:51 PM   #5
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Cheers, Jon. Yes i've de-soldered the bridge. I thought it looked different to the one i took out. Thought first of all it was to make it compatible with different machines but soon realised there was no laser present on power-up so worked it out from that.

Since de-soldering the bridge i've handled the ribbon cable. The laser is still present but could I have damaged it that way? The case is not earthed in any way to the mains so I haven't been making any special effort to ground the machine or myself while working on it.. Oops!

There are various points on the circuit boards to earth the boards to the chassis. If that is the only means of grounding these boards, (and they're currently just sitting out of the box on my kitchen worktop) maybe that's why it isn't working? Although I find this hard to believe, I shall link all the boards to ground and try that.

Cheers to everyone who's contributing to this thread, btw. I really would love to see this machine up and running again.

Dan.
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Old 29th April 2005, 11:40 PM   #6
moamps is offline moamps  Croatia
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Hi Dan,

I have a few hints regarding Tascam CD laser pickup replacement and adjustment. First, you need an oscilloscope to do this properly. Although certain testing can be done without the scope, if something is dead wrong you won't be able to spot the problem by using only DVM. Here's what you can do without the scope.

After you have replaced the pickup, it's usually enough to do some fine tuning (if any) to get the CD up and running again. If you can remember the correct trimmer positions prior to the replacement, then set the trimmers exactly as they were before you go on. If you don't remember the original positions, set all trimmers in the middle.

Now, put back everything except the upper and bottom covers.
With the player in off position, check with your finger to see if the laser pickup moves easily in and out.
Pull the laser pickup out as far as it goes and switch the player on while observing the pickup movement. Usually, the laser pickup reaches the end of its inward travel and then the laser lens (actuator) moves up and down three or four times.
The only adjustment you can do with the DVM is the Sled balance adjustment. Find SD pin on the test connector and connect DVM to it in DC voltage position (second probe to the ground). With the player in on position and no disc loaded, adjust zero reading using S.BAL trimmer.

Then load an undamaged disc and push play. If the CD doesn't work, you have a sort of failure that cannot be repaired without the scope, IMHO. If the CD works, you can do some additional adjustments but first things first.

Regards,
Milan
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Old 30th April 2005, 09:52 AM   #7
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Everything you said about initial power up after replacing the laser is exactly what happened. That's good! I'll build it back up and let you know how it's going.

Cheers, Dan.
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Old 1st May 2005, 02:56 PM   #8
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Right. Sorry it's taken so long to make this update. I've rebuilt the unit and it was still spinning the disc for about 5 seconds, trying to read the TOC then stopping. I've just managed to get the thing spinning continuously but it still won't read the disc. In fact it won't play, pause find a different track or even stop when i ask it to! I've adjusted the focus pot till the player is nearly silent in operation, so i know it's focusing okay on the disc and the transport has been built back to it's usual rigidness so I know that's not a problem.

Anyone help me from here in?

Cheers, Dan.
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Old 1st May 2005, 04:25 PM   #9
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Default TEAC

Hi Dan,

If everything you've don 'till now didn't help, why don't you put all the parts back in, make it original again and then start alover again!

If that doesn't work, you can always send it to me, I'll fix it for you and will send it back to you asap.

Best regards,

Audiofanatic
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Old 1st May 2005, 06:15 PM   #10
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The only part i've replaced is the laser, a straight swap old for new but the machine is still playing up because of some 'tweaking' i did to the servo pots trying to get the old laser to work properly. I have been sat literaly for hours just adjusting these five pots randomly. I'm begining to think that the problem is no longer with the laser and more with the firmware.

Audiofanatic: I really apreciate the offer. Do you think it's within your powers to ressurect this lame beast?
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