electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
pioneer hi-fi problem, please help!
Goto page Previous  1, 2
 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Electronics General
View previous topic :: View next topic  
Author Message
[email protected]
Guest





PostPosted: Sat Apr 11, 2020 2:45 am    Post subject: Pioneer X-HM30DAb timer LED flashing Reply with quote

Folks, I have just repaired such a unit. The problem was found to be a 4,700 microfarad power supply capacitor that goes leaky under voltage which blows fuse #404. I noticed it was slightly bulging at the top compared to the other capacitors.
I couldn't get a circuit but also traced the circuitry around the relay that connects the mains to the main transformer and found a problematic 7550-1 I.C. which I replaced with a 78L05. The circuitry associated with this regulator gets controlled from elsewhere and disconnects the mains if something is detected as wrong.
Hope this helps someone.
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Electronics General All times are GMT
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Електроника София - Service Manuals Free Download - Prikachi - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Search - Jabse.InK  - Pulsator

Connector Pinout Forum - Новини - SnimkiOt.com - безплатен DNS - Whois разузнаване - Poblizo.com : пътешествия