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 ?
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 ?
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
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
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 ?
But I will try upside down.
Any idea if other cheaper players have same laser / board ?
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
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
Extreme_Boky said:
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 ???
Attachments
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.
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
matthias
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.
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.
http://www.diyaudio.com/forums/showthread.php?postid=536409#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 🙂
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 🙂
Bernhard
I do have a working DX6800.
Don't know the differences though between yours and mine.
If there's enough similarity I could open up mine and do some measurements for you if you like. Could you take some close-ups from both (?) PCB’s?
/Hugo 🙂
I do have a working DX6800.
Don't know the differences though between yours and mine.
If there's enough similarity I could open up mine and do some measurements for you if you like. Could you take some close-ups from both (?) PCB’s?
/Hugo 🙂
Thanks,
both boards are different. I have 2xTDA1547.
Also Servo board has completely different chips.
I measure 0,9V too.
both boards are different. I have 2xTDA1547.
Also Servo board has completely different chips.
I measure 0,9V too.
Hi Bernhard,
The *.jpg file you sent is an aye-pattern signal. The RF test point is located after the "first" IC which usually does many things like: RF amplifier, focus servo, tracking servo, spindle servo, sled servo, focus detection, track detection, defect detection. This RF signal is usually fed to DSP chip which outputs DATA, BCK and LRCK signals to DAC ICs.
Netlist measured the same PP value, so it could be that the laser diode is okay. However, to be sure, you really need a service manual with patterns and voltage levels. 0.9 Vpp is a bit too low; however, it might work for the given chipsets.
Regards,
Extreme_Boky
The *.jpg file you sent is an aye-pattern signal. The RF test point is located after the "first" IC which usually does many things like: RF amplifier, focus servo, tracking servo, spindle servo, sled servo, focus detection, track detection, defect detection. This RF signal is usually fed to DSP chip which outputs DATA, BCK and LRCK signals to DAC ICs.
Netlist measured the same PP value, so it could be that the laser diode is okay. However, to be sure, you really need a service manual with patterns and voltage levels. 0.9 Vpp is a bit too low; however, it might work for the given chipsets.
Regards,
Extreme_Boky
I took an old DX6850 from the shelf which was apparently unrepairable. Switched it on an after the second try it played.
At first I had the spindle motor trembling. I helped it a bit and the player works again.
HF: 0.7Vpp
It doesn't skip at all, which means these units can play with a rather low HF voltage.
Not wanting to scare you Bernhard but I would check that spindle motor. 😉
I'll give the Onkyo guys a call tomorrow and ask for the correct values and if possible some manuals.
/Hugo
At first I had the spindle motor trembling. I helped it a bit and the player works again.
HF: 0.7Vpp
It doesn't skip at all, which means these units can play with a rather low HF voltage.
Not wanting to scare you Bernhard but I would check that spindle motor. 😉
I'll give the Onkyo guys a call tomorrow and ask for the correct values and if possible some manuals.
/Hugo
Bernhard
Not sure what you found unless its that black plastic wheel in the corner?
Now would be a good time to solder that 1nF cap between the motor leads.
/Hugo 🙂
Not sure what you found unless its that black plastic wheel in the corner?
Now would be a good time to solder that 1nF cap between the motor leads.
/Hugo 🙂
Hugo,
that black plastic wheel is a screw that was on the inner side on the plastic side cover of the player, 3 are outside and one inside.
Fell off somehow, got into the transport somehow and was fixed there by the magnet of the laser transport.
It made it impossible for the laser to move to the start position.
I bought it on a flea market but rather expensive.
Sometimes it does not read after inserting disk and I must open/close tray again.
The capacitor is just for general HF decontamination ?
Bernhard
that black plastic wheel is a screw that was on the inner side on the plastic side cover of the player, 3 are outside and one inside.
Fell off somehow, got into the transport somehow and was fixed there by the magnet of the laser transport.
It made it impossible for the laser to move to the start position.
I bought it on a flea market but rather expensive.
Sometimes it does not read after inserting disk and I must open/close tray again.
The capacitor is just for general HF decontamination ?
Bernhard
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