PROGRESS on CD-ROM² Repair

[wolfman]

So it didn't have the issue while testing?

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No, the heat/sled issue is still unsolved. Strangely loading times seem not to be affected.

[thesteve]

Check connection between pin6 both chips
Your .15 output reading was wrong
The coil noise when touching with probe indicated high resistance (possible open)


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[wolfman]

Check connection between pin6 both chips
Your .15 output reading was wrong
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Between what?

I confirm .15 WAS correct, I checked 3 times. Had it been 0 I would have said so. You think my VOM is glitchy?

[thesteve]

no i think your issue was producing 0.15
it should have been 0 but it wasnt
the same chip had an offset 0.06 on its other output as well so i suspect its pin6 isnt connecting solidly to the cxa1082 or has a resistor prob related to that chip

[wolfman]

no i think your issue was producing 0.15
it should have been 0 but it wasnt
the same chip had an offset 0.06 on its other output as well so i suspect its pin6 isnt connecting solidly to the cxa1082 or has a resistor prob related to that chip

Ok, thank you for verifying that. I´ll check for this...hopefully I´ll find something...

[wolfman]

Ok, I checked again all connections around the 2 BA6290s, everything had connection (lower PCB side).

On the upper side I verified all resistors I could access without desoldering items. Every resistor had matching numbers within tolerances. All connections to the CXA1082BQ seemed fine (the ones that I could check a little below and above pin #20, the others arent really accessible), connection between resistors and CXA also are fine.

I don´t know where else to look for...maybe a cap that has gone bad (although I replaced them first before I did anything else)?

There are two E474 SMD caps, where I don´t get results with my VOM...from the number I´d say it they are 16V/470uF?

[thesteve]

Might be 0.47uf

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[wolfman]

Might be 0.47uf

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Do you think it could be responsible for this issue?

[thesteve]

Nope


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[wolfman]

Ok. Since I can´t find the source of this error and the drive is working fine except for the heat issue, I´ll leave it the way it is. At least it is working and is reading every CD fine....guess I should be happy anway.

Thank you though for your support!

[pnauts]

Hi guys, I use this topic to avoid opening another one.
I decided to bring back to life a dead CDR² unit. I know mine had a middle gear issue, and send my regards to PC Kid from the French forum dedicated to NEC consoles, who provided me a new gear, that he made with a supplier he know. The easy part with the old one is it turn into dust very quickly with age.







Once done, I removed the little plastic chips stuck in the grease, check the complete rotationof the new gear and I used a original game and I did face to the "Wait a Moment" issue.
Ok so the CD spin it's a good point, but I decided to test first an audio CD, Tesseract Altered State, tracks are detected quickly then only scratching noise when attempting to read then stop quickly. I decided to adjust directly last pots while reading.
For that I removed the bottom case, put down an isolation paper to avoid short and give it a try on VR105.
the audio came back and the reading seems smoothy with less mechanical noises.
I did try a CD game (Spriggan) with success but I encountered some issues with SCD.
With Deden no Den I had Macroblocking picture right after launching the game and with Emerald Dragon green screen.
I think I'm not too far from fixing it, and I think perhaps I'll have to check again the VR105 (Voltage control oscillator right ?) I can have an oscilloscope for testing RF pin, so any screen example will be appreciated.
Thanks.

[pnauts]

fixed.
super system card on Everdrive + SCD + CDromrom = don't works.