Onkyo 6890 does not read

Bernhard · 8th January 2005, 02:53 PM

Hi,

just got a used 6890 and want to measure the TDA1547...

But it does not read the disk.

It spins and makes intermittand noise as it hardly tries.

When I turn back laser power on the pot on the laser pick up, it does not search any more.
So I think the laser is not dead. Also lens pumps up and down without disk and laser is visible
Higher laser output does not help.

Also reacts to pot adjustments, but does not read the disk.

Sony chip defective ? CXA1571S, CXA1372S.

Any other idea ?

hiwiho · 9th January 2005, 10:40 PM

Hopefully you marked the original positions of the potis?? It's an old integra, isn't it?? I once planned to buy a (yet older) used one from the xx-50-series, but dumped it when I heard they often get pickup problems and those pickups are out of stock. Don't ask me where i read it (don't recall), but i think the lens is hold by a foam surrounding comparable to a speaker suspension. This foam starts to become out-of-shape. Try this: readjust to original poti values (perhaps increase laser power) insert a disc, switch the player off and turn it around upside down for an hour. Turn it on again then. If it reads the disk upside down, the suspension is worn and the player cannot focus any more.
Or you can try to get the service manual to find a pin where you can measure the focus-ok-signal...
I've got an Nakamichi where i have problems with one of the sony chips, but i was told that happens almost never.

Matthias

Bernhard · 9th January 2005, 10:45 PM

The lens moves up and down when I switch on the player with no disk.
But I will try upside down.

Any idea if other cheaper players have same laser / board ?

Extreme_Boky · 11th January 2005, 11:00 AM

Hi Bernhard,

Check if your CD player has one, or (most likely) two trim-pots in the tracking and servo control section of the PCB. If this is the case, you'll need service manual to adjust focus and servo properly. You might need a special CD as well.

You will save yourself a lot of time (and money - the "setup" CD is around A$70 - A$90) if you take the player to service.

You can check if the laser diode is outputting properly if you find the "RF" test - point on PCB. Insert a disk and press PLAY. While the disk is spinning, measure the RF level of the eye-pattern. It should be around 1.6V to 1.8V PP. If it is lover, you have a bad (used) laser diode and you'll probably have to replace the pickup.
And one more thing: the laser diode output can be adjusted with the little trim-pot located on the pickup itself.

Regards,
Extreme_Boky

Bernhard · 12th January 2005, 02:52 PM

Quote:

Originally posted by Extreme_Boky
You can check if the laser diode is outputting properly if you find the "RF" test - point on PCB. Insert a disk and press PLAY. While the disk is spinning, measure the RF level of the eye-pattern. It should be around 1.6V to 1.8V PP. If it is lover, you have a bad (used) laser diode and you'll probably have to replace the pickup.

RF swings between 0,2 and 0,9 V only when laser output pot is adjusted so that it starts searching.

I can bring it to 0,5 and 1,8 but it does not help and I think it is not healthy for the laser.

On another Onkyo, a DX6660 it also swings 0,2 to 0,9 and works properly.

Defective CXA chip ?
Does RF directly come from the laser unprocessed by CXA chips ?

Never seen an eye pattern before

It is there but varies a little as the intermittand search sound varies like sss sss sss sss...

Can we declare the laser as "working " ?

Picture: Upper is working DX6660 , lower is bad 6890 seems a little hazy, also some pictures it looked very hazy but as said it moves a little, focus problem ???

Bernhard · 12th January 2005, 06:49 PM

While searching, the spindle motor accelerates a little about 2 times a second and the eye pattern does the opposite of expansion ( don`t find the word

) on the x-axis.

Netlist · 12th January 2005, 07:27 PM

Bernhard,
is this the laserunit?

/Hugo

hiwiho · 12th January 2005, 07:35 PM

Yes, as one can see in many euras-based catalogues of online spare part vendors, the spu3013 is the pickup of the 6890 and no longer available

matthias

Bernhard · 12th January 2005, 07:40 PM

Hugo,

yes it is.
It means whole 68XX series got the same laser.
Do you know where to get one ?
Besides I do not know if it is bad in my player.

I found a CXA1372 in a cheap Denon.

Maybe this one is dead.

Netlist · 12th January 2005, 07:49 PM

http://www.diyaudio.com/forums/showt...409#post536409

I know from experience that the spindle motor often fails too.

There is one little trick when for example the unit fails to play when cold. Solder a 1nF ceramic cap directly on the motor wires.

/Hugo

8th January 2005, 02:53 PM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Onkyo 6890 does not read Hi, just got a used 6890 and want to measure the TDA1547... But it does not read the disk. It spins and makes intermittand noise as it hardly tries. When I turn back laser power on the pot on the laser pick up, it does not search any more. So I think the laser is not dead. Also lens pumps up and down without disk and laser is visible Higher laser output does not help. Also reacts to pot adjustments, but does not read the disk. Sony chip defective ? CXA1571S, CXA1372S. Any other idea ?

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9th January 2005, 10:40 PM	#2
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	Hopefully you marked the original positions of the potis?? It's an old integra, isn't it?? I once planned to buy a (yet older) used one from the xx-50-series, but dumped it when I heard they often get pickup problems and those pickups are out of stock. Don't ask me where i read it (don't recall), but i think the lens is hold by a foam surrounding comparable to a speaker suspension. This foam starts to become out-of-shape. Try this: readjust to original poti values (perhaps increase laser power) insert a disc, switch the player off and turn it around upside down for an hour. Turn it on again then. If it reads the disk upside down, the suspension is worn and the player cannot focus any more. Or you can try to get the service manual to find a pin where you can measure the focus-ok-signal... I've got an Nakamichi where i have problems with one of the sony chips, but i was told that happens almost never. Matthias

9th January 2005, 10:45 PM	#3
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	The lens moves up and down when I switch on the player with no disk. But I will try upside down. Any idea if other cheaper players have same laser / board ?

11th January 2005, 11:00 AM	#4
Extreme_Boky diyAudio Member Join Date: Dec 2003 Location: Sydney	Hi Bernhard, Check if your CD player has one, or (most likely) two trim-pots in the tracking and servo control section of the PCB. If this is the case, you'll need service manual to adjust focus and servo properly. You might need a special CD as well. You will save yourself a lot of time (and money - the "setup" CD is around A$70 - A$90) if you take the player to service. You can check if the laser diode is outputting properly if you find the "RF" test - point on PCB. Insert a disk and press PLAY. While the disk is spinning, measure the RF level of the eye-pattern. It should be around 1.6V to 1.8V PP. If it is lover, you have a bad (used) laser diode and you'll probably have to replace the pickup. And one more thing: the laser diode output can be adjusted with the little trim-pot located on the pickup itself. Regards, Extreme_Boky

12th January 2005, 06:49 PM	#6
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	While searching, the spindle motor accelerates a little about 2 times a second and the eye pattern does the opposite of expansion ( don`t find the word ) on the x-axis.

12th January 2005, 07:27 PM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	Bernhard, is this the laserunit? /Hugo

12th January 2005, 07:35 PM	#8
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	Yes, as one can see in many euras-based catalogues of online spare part vendors, the spu3013 is the pickup of the 6890 and no longer available matthias

12th January 2005, 07:40 PM	#9
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Hugo, yes it is. It means whole 68XX series got the same laser. Do you know where to get one ? Besides I do not know if it is bad in my player. I found a CXA1372 in a cheap Denon. Maybe this one is dead.

12th January 2005, 07:49 PM	#10
Netlist diyAudio Moderator Join Date: Jan 2003	http://www.diyaudio.com/forums/showt...409#post536409 I know from experience that the spindle motor often fails too. There is one little trick when for example the unit fails to play when cold. Solder a 1nF ceramic cap directly on the motor wires. /Hugo

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