Revox B126 CD Player Malfunction- Help Needed (TDA1541A-CDM4/27) - Page 2 - diyAudio
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Old 10th October 2010, 05:11 AM   #11
amc184 is offline amc184  New Zealand
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Looking at the symptoms you describe, I think the problem is still likely to be the servo. Within those first couple of minutes, can the player skip to the last tracks of a CD?

Based on the timing of the fault, it certainly does sound like a heat related problem. Do you have any freezer spray? If so, you could try spraying the different ICs on the servo board. If not, you could try operating it 'till it fails, then seeing if any of the ICs seem unusually hot.

Failing that, try replacing both the TDA5708 and 5709.

You have been recalibrating the Laser Power and Focus Offset adjustments after making each major change, right?
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Old 15th October 2010, 05:47 PM   #12
dtm1962 is offline dtm1962  Canada
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Default Update: Continued problems with Revox Player

Here are the sysmptoms:

It will play perfectly for 1 minute to 10 minutes depending on the temperature of the unit (Ambient). It will begin to mistracked and music becomes garbled and eventually it will stop spinning the disc. Turn it off for a couple minutes and it will start-up and play for 1 minute since it is warmed up at this point.

For example it was sitting in my unheated work shed overnight and it got down to say 4 Celcius (40 F) and I turned it on and it worked for 10 minutes perfectly.

If its a 10-15 C mid-day and I will turn it on and it will work for 2 minutes or so.

If its 20 C or 68 F, the unit will play for only 1 minute.

So I believe it is temperature related.

I have replaced the following with no change:

I changed the following on the Servo board:

All transistors, TDA5708/5709 Decoder chips, 4560 & TCA372 Opamps; the 4.7K & 22K pots; the 2 7.5V Zeners and all electro. caps have been changed and all resistors have been checked.

On the Main Board (I had some spares):

The SAA7010/SAA7020 & Memory chip associated with the SAA7010, the 11.28XX Mhz crystal, all transistors associated with the PS and IC chips.

Next up is the CD turntable Drive output transistors & the laser assembly.

Any ideas would be helpful?

Let me know.

Thanks in advance.
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Old 15th October 2010, 10:22 PM   #13
dtm1962 is offline dtm1962  Canada
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Default Success!

The laser assembly seemed to do the trick......

Only thing is that it plays all commercial CD's and plays some CD-R's.

It seems to play the most scratched CD-R but will not play almost perfect condition CD-R's.

It must be the way I recorded or the brand as the scratched CD-R is different brand from the other perfect condition CD-R's that won't play.

Any idea or experience with this situation???
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Old 16th October 2010, 08:40 AM   #14
poynton is offline poynton  United Kingdom
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So what exactly did you replace in the laser assembly to get the CDp going??

Andy
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Old 16th October 2010, 03:40 PM   #15
dtm1962 is offline dtm1962  Canada
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Originally Posted by poynton View Post
So what exactly did you replace in the laser assembly to get the CDp going??

Andy

Hi Andy:

I replaced the laser/ribbon cable/radial motor assembly minus the CD disc Drive assembly/plastic base. So basically take a CDM4/19 and unbolt the laser assembly via 2 screws and swap out.
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