Author Topic: White CDROM2 Spins then "Please Set Disc"  (Read 27 times)

opticalnoise

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White CDROM2 Spins then "Please Set Disc"
« on: April 18, 2024, 11:53:38 PM »
Now that I've got my Duo RX fixed, it's time to get this briefcase and CDROM2 unit running!

Here are the symptoms. I've got a working white PC Engine in an IFU-30. I've got a non-working CDROM2 that I bought with it. Opening up the CD unit, I can see the middle gear is fine and still moves the laser assembly, but the main screw-like part that moves the laser is dry as a bone. I re-greased it gently using white lithium grease and wiped away all the excess, moving the assembly back and forth a few times and rotating the gear/screw thing to get all sides of it equally greased. When I move the assembly all the way out and power on the unit, the assembly moves back to the center start position - verifying the middle gear is ok and grease is sufficient. The LED also shows PC.

The problem is on the screen I either get please set disc, or I get stuck on please wait. The disc is spinning, but it will not play music CDs, either. Also I am using an official CD game and not a CD-R. I then tried cleaning the CD lens with a Q-tip and some ISO 99% but results were the same - please set disc.

Reviewing this post and Keith's info there, I adjusted the laser settings to match the image. Results are the same on boot.
https://www.pcenginefans.com/forum/index.php?topic=23852.0

Since I know it's not the gears, the screw that moves the assembly or a bad disc, or the potentiometers (I think, hard to verify with this thing as I can't adjust them on the fly while the unit is powered) I am officially stumped.

Bad laser? Recap?

Below are pictures of the board, potentiometer positions before the adjustment to match Keiths, and pictures of the two cables which Keith mentioned could be messed up.







Keith Courage

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Re: White CDROM2 Spins then "Please Set Disc"
« Reply #1 on: April 20, 2024, 06:07:21 AM »
I would start with capacitors. Here is a picture of the two rows of capacitors that typically go bad. Especially the 4.7UF ones near the volume dial.


Looks like there is some black leakage coming through from the 4.7UF caps on your board.
« Last Edit: April 20, 2024, 06:15:43 AM by Keith Courage »

opticalnoise

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Re: White CDROM2 Spins then "Please Set Disc"
« Reply #2 on: Today at 05:09:14 PM »
Just ordered the cap kit - will post an update once I've done the recap. Thanks for the advice!