Yba cd2 delta, classe cdp .3, roksan caspian ... main board

[opteron]

Anyone can confirm? I have new laser unit and only some CD-R are read correctly, no RW read at all.
Is stock Laser current to little for that?

 

[Michel]

Opteron,

The YBA Alpha and Delta CD players use the same laser and have been created before the CD-R and CD-RW did exist.
To be able to play any of them you will definitely need to increase power and to perform this adjustment correctly you need an oscilloscope.
Make sure your laser lens is clean before proceeding to any adjustment.
Be aware that reflectivity of the discs will affect the readability and that you should choose a brand that gives good results and stick with it.
If you don't do that you will have to increase power only to accommodate a couple of hard to read discs and risk the possibility of shortening the life of your laser.
It would be much wiser to transfer the content of the hard to read discs to easy to read discs and be gentle on laser power...

 

[Extreme_Boky]

CD and CD-R will work ok with single-setting laser output power (which can be adjusted nicely to be within + and - 0.5V of Vcc and Vee of the servo chip used). CD-RW have much lower reflectivity compared to CD's and CD-R's. If the laser power is increased to accommodate CD-RW, it is certain the RF signal will clip above Vcc/Vee of the servo if the player reads standard CD. "Overscan" CD mechanism/servo/microcontroller is required to detect either CD/CD-R or CD-RW disk, and switch the laser power between two settings "automatically"....

Boky

 

[stephensank]

In my experience, which is considerable, there is NO player that will handle CD-RW that was not specifically designed to handle it. The players in question here will absolutely, positively never be able to do rw.

 

[opteron]

Thanks for explanation!
I had similar issue with SF-P101 in few players, when I make them to RW read they had sporadic problems with original discs (probably RF clipping). I decide to not touch the laser emission power, couple of CDR can be copied to another discs.

Regards

 

[tiefbassuebertr]

6 various Versions of Sanyo "SF-90" (SF90)

I need help for order a new SANYO laser unit (optical pick up) "SF-90" unit for the Parasound model "C/BD2000".
The mechanism and laser unit are the same parts than by the other listed models about post #5 here on this thread.

Until now I thought, that there are only two SF-90 versions on the marked:
One version with an integrated circuit for the APC and an other with a discrete solution therefore.

But by searching on the web I discover 6 various versions from SANYO's SF-90:

1) 5/8
http://vip.blueshop.com.tw/conley/picture/sanyo/SF-90 58P.JPG
http://www.ersatzteil.justone-schnepel.de/assets/images/SF-90-58-Kabel_02.jpg
2) 6/6
http://vip.blueshop.com.tw/conley/picture/sanyo/SF-9066.JPG
http://www.ersatzteil.justone-schnepel.de/assets/images/SF90_6_6_01_web.jpg
http://www.ersatzteil.justone-schnepel.de/assets/images/SF_P1_6_6_03_web.jpg
http://www.donberg.ie/pics/s/sf_90_6-6-2.jpg
3) 6/7
http://vip.blueshop.com.tw/conley/picture/sanyo/SF-90 67P.JPG
SF-90 (6-7) - german.alibaba.com
4) "A"
http://www.vcdpickup.com/Sf-90a.jpg
5) "B"
http://www.vcdpickup.com/Sf-90b.jpg
6) "IC"
http://i01.i.aliimg.com/photo/v0/273412723/SF_90_IC_Optical_lens_for_CD.jpg

more URLs to this optical pickup from Sanyo:
JusTone Lasereinheiten. SF-90 (6/6Pol.) / SF90-6/6 / SF90-6/6 SANYO. Lasereinheit, Laserpickup, Laserunit, Pickup, Laser, Laserkopf, Laufwerk, Mechanism
JusTone Lasereinheiten. SF-90 (5/8 Kabel) / SF90-5/8-Kabel SANYO Lasereinheit, Laserpickup, Laserunit, Pickup, Laser, Laserkopf
Electronic parts marke www.vcdpickup.com
Los diodos láser utilizados en los pick up de CD
http://vip.blueshop.com.tw/conley/picture/sanyo/SF-90 67P.JPG
¤T¬v¨t¦C

Which version I must order ??
Thank you very much for advices.

BTW - this is my first "SF-90", that I must replace, because inside of the vibrational field for the lens suspension I observe unwanted braking effects (friction). Despite not fatigued/muddy laser diode I must replace the unit.
Unfortunately the SF91 outline is a mirror image from the SF-90 and thus the SF-91 model, that I have several times, isn't helpful.

The thread
http://www.diyaudio.com/forums/digi...-sf-p1-lens-tracking-problem-please-help.html
mentioned the SF-P1 (SFP1) for that mechanism.

 

[opteron]

http://www.donberg.ie/pics/s/sf_90_6-6-2.jpg

 

[opteron]

And... If You want to change laser because some mech jerking (friction as you wrote) - then probably it won't help. Read topic and find info about R164.

 

[tiefbassuebertr]

And... If You want to change laser because some mech jerking (friction as you wrote) - then probably it won't help. Read topic and find info about R164.

Obviously my english is too bad for exact understanding. Probably "friction" isn't the right term.
The lens of the SF-90 behaves exact in that kind, as if it were stored in a very viscous oil.
I cannot believe, that this is a correct behaviour (I have this observe never before bei SANYO, only by Sony KSS laser units cause its plastic suspension).

Now the next issue with such a belt drive mechanism (now CEC model TL5100):

Most compact disc wobbles due to a faulty turntable after put-on the heavy weight (because of a defective surface for the CD the flexible inner part of the turntable).

Where I get such a turntable or its inner part for the belt drive mechanism?

 

[tiefbassuebertr]

Sanyo SF-90 - unwanted behaviour through too strongly damped Acutator

The lens suspension of the SF-90 behaves exact in that kind, as if it were stored in a very viscous oil.
I cannot believe, that this is a correct behaviour (I have this observe never before bei SANYO, only by Sony KSS laser units cause its plastic suspension).

But in the meantime I know, this is for all SF-90 devices so, because I have order several cd players, where the SF-90 pickup is in use. Consequence is not best results while playing, particularly when is inside burned CD.
By the models "SF-91" and "SF-P101VZ" this isn't to observe.
Datasheet of the Sanyo mechanism DA11B3VZ+SF-P101VZ" is here:
http://www.partmate.com/download/OPU/DA11B3VZT_SPEC.pdf

Who know, from where I can download a datasheet from a mechanism, where the SF-90 is in use?
I know this mechanism, which use SF-90 pickups:
CDL20W, CDL210W, CDL212W and CDL42.
And a second question: By which part the manufacturer determine the degree of acutator damping ?

Thank you for advices.

 

[prinzinio]

Hello all,

The absolute first thing you have to do when you have reading problems with an Alpha or Delta series YBA CD player is clean the laser. When I say clean I mean using a Q-Tip soaked with glass cleaner. You would not believe how many times a dirty laser lens is what is the cause of the problem. I sometimes get an RF signal that is up to half a Volt higher after cleaning!!
As Mooly pointed out, there is no way to do a proper adjustment without an oscilloscope. You should have between 1.5V to 2V RF at TP16. Sometimes I have to crank that close to 2.5V as many customers want to read CD-R and CD-RW discs and the original setting was a little too low for that. I rarely have to replace laser pick-ups as they are extremely reliable.

As for real defects, the first thing to go bad on the Delta series of YBA CD players is the spindle motor. The second one is the YM7121B or C as the players are extremely sensitive to electrostatic discharges. The third one is the zener diode, D116, regulating the display "high voltage". The fourth one is the tray motor. I am beginning to see tray belts going loose since about a year now.

The easiest way to test the spindle motor is to connect an analog multimeter on the x1 Ohm scale to DM+ and DM- of CN102 and turn the platter very slowly to see if there are shorted spots. The needle should be steady around 15 Ohms.
The same goes for the tray motor on SM+ and SM- of CN102. A good indication that this motor is defective, IC104 gets burning hot.

Another problem I see from time to time is a jerking tray motor while reading the CD. It is more pronounced when using a CD that is not perfectly centered. When I first began to see this problem I thought it was because of off centered disc platters but after awhile I had to dismiss that conclusion as I saw more and more older players having this problem. Since I was not supplied with a schematic by YBA I had to "develop" a fix for that behavior problem. After a lot of experimentation I found that increasing the value of R164 from 2.2k to 15k I was able to eliminate the jerking. This can be done without removing the PCB by soldering the new resistor to the left side of R164 and right side of R166 and not forgetting to cut the right side of R164 AFTER the soldering is done. This new resistor value is not absolute and may differ from one machine to another. The best way is to install a resistor with full length leads in case you need to change that value.

Getting back to D116. The original value of R170 that is in series with D116 was 470 Ohms on the first PCBs I saw and became 2k2 on later PCBs. They used the same circuit on the Alpha series of YBA CD players and the same diode burning problem happened then..., after they replaced the transformer originally coming with the PCB by a "better one". The voltage output of the new transformer was higher so D116 had to dissipate more than it originally did. Stupidity being what it is, it looks like almost everybody using that PCB made the same mistake. Go figure... The really bad thing is that I can not find replacement displays anymore and this is that part that suffers/dies when D116 looses contact from the PCB traces as full voltage is applied to the display.

I am at your disposal if you need more information or even parts if you can not find them and would be extremely grateful if someone had the schematic and could send me a copy.

Best regards,

Michel

Hi Michel

do you have any experience with this Sanyo PCB?

I wanted to try your R164 resistor mod, but I am not sure which one on mine PCB [CEC TL2] refers to it.

 

[Michel]

Hello prinzinio,

Sorry but I'm not familiar with this board but, it has lots of similarities with the YBA Delta board. Shown is a partial schematic of what I did to address the shaking problem. You can see where resistor R164 is connected in relation to IC104. If your circuit uses the same configuration, you should be able to put your finger on the resistor that does the same work.

Good luck!

Michel

 

[prinzinio]

Hi Michel,

Thanks a lot! That helped me much.
I was able to track the proper resistor and it is also numbered R164. Tomorrow i will try to put 20k res and see what will happen with motor/drive.

Thank you,
Piotr

 

[prinzinio]

Michel,

CEC motor seems to work much smoothly than before the mod. Thanks for sharing this info with detailed description. All the best!

 

[tiefbassuebertr]

The lens suspension of the SF-90 behaves exact in that kind, as if it were stored in a very viscous oil.
I cannot believe, that this is a correct behaviour (I have this observe never before bei SANYO, only by Sony KSS laser units cause its plastic suspension).

But in the meantime I know, this is for all SF-90 devices so, because I have order several cd players, where the SF-90 pickup is in use. Consequence is not best results while playing, particularly when is inside burned CD.
By the models "SF-91" and "SF-P101VZ" this isn't to observe.
Datasheet of the Sanyo mechanism DA11B3VZ+SF-P101VZ" is here:
http://www.partmate.com/download/OPU/DA11B3VZT_SPEC.pdf

Who know, from where I can download a datasheet from a mechanism, where the SF-90 is in use?
I know this mechanism, which use SF-90 pickups:
CDL20W, CDL210W, CDL212W and CDL42.
And a second question: By which part the manufacturer determine the degree of acutator damping ?

Thank you for advices.

any news?

 

[krako974]

Hi Michel could you'll please help me
My CEC 2100 doesn't have sound on left channel
the laser diode is OK the dac board ok I haven't sound of the output on left YM7121B chip

 

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[k6jek]

Has anyone deciphered the first step in the CEC 2100 et al alignment instructions? Several service manuals, all apparently copied from the same place, say this, which I can't figure out.

1. Turn on the power. Short jumper CN109 pin and 2 pin and jumper TP15 TOF

 

[tiefbassuebertr]

post #37 provides information on Air Conditioner - at least according the language tools

 

[tiefbassuebertr]

Sanyo SF-90 - unwanted behavior through too strongly damped Actuator

The lens suspension of the SF-90 behaves exact in that kind, as if it were stored in a very viscous oil.
I cannot believe, that this is a correct behavior (I have this observe never before bei SANYO, only by Sony KSS laser units cause its plastic suspension).

But in the meantime I know, this is for all SF-90 devices so, because I have order several cd players, where the SF-90 pickup is in use. Consequence is not best results while playing, particularly when is inside burned CD.
By the models "SF-91" and "SF-P101VZ" this isn't to observe.
Datasheet of the Sanyo mechanism DA11B3VZ+SF-P101VZ" is here:
http://www.partmate.com/download/OPU/DA11B3VZT_SPEC.pdf

Who know, from where I can download a datasheet from a mechanism, where the SF-90 is in use?
I know this mechanism, which use SF-90 pickups:
CDL20W, CDL210W, CDL212W and CDL42.
And a second question: By which part the manufacturer determine the degree of actuator damping ?

Thank you for an advice.

maybe this effect occurs due the age of this laser unit. But I don't know exactly.