Sony CDP-295/407 tray opens only halfway

[Xenon-Codex]

The mechanism works in other unit, and the working mechanism does the same in this broken unit. So the fault must be in the motherboard. Eject may open the tray with a second try, but it will not close or play any disc.

[Xenon-Codex]

This is weird, the mainboard is also working. The front panel causes the problem, all works with another front panel. Can it be just a faulty microswitch?

[Xenon-Codex]

Changing the Eject switch did not help. Still opens halfway, after a few seconds it opens fully. But don't come back in.

[redwire]

Sony CDP players, I've had problems with the switches.
Check the tray mech limit switches, just drag some paper between the squished contacts to clean off oxide. Or use a PPE contact cleaner if you can do it without spraying a mess.

One CDP drove me nuts, it kept returning to the beginning of the CD track 1 whenever it wanted to. Just tap the unit.
Turns out it was the (low voltage) ON/OFF pushbutton switch making bad connection intermittently going open and the player thought it was a reboot. It is always powered on inside.

[Xenon-Codex]

No change, the powerbutton works in the other unit. Only possibility is the IC401 under the LCD.

[petehall347]

maybe a sticky button

[redwire]

Not really making sense if swapping the main board or mechanism does not fix it.

Check the remote RX IC402 is not making noise or garbage pulses to confuse the drawer controller.
"Defect Switch" I think activates when the switches are not making sense i.e. load in and load out are asserted makes no sense.

[Xenon-Codex]

Removed the IR receiver but no change. Eject-button will open the tray to full open, but does not close and the tray motor continues to spin.
Eject function seems to be always on, I can't push the tray back if power is on.

[stj]

tray motor continues to spin?
remove the tray and clean the belt and pully's.
if the motor turns the tray should move, and if the tray cant move the motor should stall.
only 3rd option is slippage because the belt is dirty or stretched.
very common on games consoles

and check the tray open/closed switches with a meter - preferably from the control chip to eliminate bad connections between them.

[Xenon-Codex]

tray motor continues to spin?
remove the tray and clean the belt and pully's.
if the motor turns the tray should move, and if the tray cant move the motor should stall.
only 3rd option is slippage because the belt is dirty or stretched.
very common on games consoles

and check the tray open/closed switches with a meter - preferably from the control chip to eliminate bad connections between them.

Can't be in the mechanism, as it works with another front panel. Tray opens and needs force to put back in agains the motor (didn't do that).

[stj]

maybe the mech is stiff and one panel cant supply enough current?

[Xenon-Codex]

Got a third player which has working parts inside. Changed the the front panel PCB and the same fault appears. Luckily this has the case in poor condition, so I took the PCB from it, and it works with the 407. It's different but works. The IC is on the backside and such things.