Please select To the mobile version | Continue to access the desktop computer version
| |

Kaosun's CD Players

 Forgot password?
 Repair!
Search
View: 287|Reply: 2

Discman D-50 MK2 not booting error

[Copy link]

10

Threads

22

Posts

540

Credits

Senior Member

Rank: 4

Credits
540

 Vietnam

Post time: 2021-02-09 02:48:18
| Show all posts |Read mode
I own a D-50 MK2 discman that is doing fine. Recently, out of curiosity I have replaced 2 opamp 4560 with op275 (ic102, ic202).
When I start it up, a sound comes out at the output, but wrong for a few seconds, the engine stops working.
When I try to start the motor spins for a few seconds, the LCD lights up, but turns off after a few seconds. Repeatedly pressing "PLAY", the engine does not respond!
Leave it on for a few minutes, if you press "PLAY", the same situation will be repeated as above ???
I replaced back ic102,202 with NJM4560 as original but it still does not improve anything!
I check CPU (ic801) Vcc pin, RST is normal, only pin 30 (P-CON) only first time is from H - >> L (5v -> 0v), all the times after is from 5v-> 5.8v ??? Makes it bootable! When khi "PLAY" , 9v, 5v, -5v is good.
I think ic801 is faulty, so I have replaced it with another one which is working fine. But the situation is still not improving! Still have the same situation as before.
Please help me locate the error and localize the damage! thank you very much Mrs Gu! Sorry for my bad English!


Reply

Use magic Report

413

Threads

682

Posts

4108

Credits

Administrator

Rank: 9Rank: 9Rank: 9

Credits
4108

 Invalid IP Address

Post time: 2021-02-09 19:17:02
| Show all posts
The OP275 can directly replace the NJM4560. The power range of the OP275 is from +-5 to +-25. The power supply of NJM4560 is +-5.2 which is suitable to power OP275. What my guess is the leaking static electricity from your soldering iron damaged something like your laser diode? Pls double check whether your laser is still working with red beam emitting. If LCD has display, the CPU should be fine.
Reply Support Not support

Use magic Report

10

Threads

22

Posts

540

Credits

Senior Member

Rank: 4

Credits
540

 Invalid IP Address

 Author| Post time: 2021-02-10 20:41:04
| Show all posts
I thank your comments for the breakdown of the D-5 MK2. But I wonder why, for a while, when the motor is turned on, the spin and sled motor is spinning and moving and only once? (check the battery 30 from 5v-> 0v), the next time only LCD open 0:00 (battery 30 from 5v increased to 5.8v ~ 6v), so can not make the DC-DC converter work? I have a real headache because of this incident, if it dies it would probably be easier to fix than something like this
Reply Support Not support

Use magic Report

You have to log in before you can reply Login | Repair!

Points Rules

Archive|Mobile|Dark room|Kaosun's CD players

2021-02-28 16:43 GMT-6 , Processed in 0.015665 sec., 14 queries .

Powered by Discuz! X3.2

Release 20141225, © 2001-2021 Comsenz Inc.

MultiLingual version, Rev. 441, © 2009-2021 netdepviet.org

Quick Reply To Top Return to the list