Rusted Crystal Caused No Radio In Philips CD Player Model AZ380/94
This set was brought to me with the complaint that CD and USB were working, but no Radio. I opened the set and after cleaning up the inside, dismantled the whole set to check the PCB.
After touching up a few dry solder joints checked the power supply and components in the section and found these to be normal.
No ESR problems on caps too! (Very disappointing for me! LOL) Here is an extract of the schematic that I could download:
Found that the voltages to the Radio IC was also normal and audio signals injected at pins 23 and 24 (L-out and R-out) reached the speakers. Then chanced to look at the crystal from the top side of the PCB and the legs of it seemed to be corroded. Used a lens and confirmed it was indeed corroded and cut.
So replaced the 32.768 Crystal from my stock. The Radio started working very well! Reassembled the set after lubricating all switches and connectors and retouching the connector pins. The set worked perfectly well in all modes! Mission accomplished and satisfaction got added to its collection bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on Ikon Induction Cooker Repair
(48)Dislikes
(0)
11 Comments
Leave a Reply
Paul
June 14, 2021 at 3:40 pm
Hi,
Please find a way to post higher resolution pictures and schematics.
Usually they are not readable and that is a big downside.
Parasuraman Subramanian
June 15, 2021 at 9:49 pm
Many thanks! I have limitations. Further posting in web is with Jestine Yong! Perhaps he could help us!
Jestine Yong
June 16, 2021 at 11:46 am
Hi Paul,
You can right click on the photo and click on "Open Image In New Tab". After that you can press on the keyboard control button and scroll the mouse to make the picture bigger.
Jestine
Parasuraman S
June 16, 2021 at 4:11 pm
Many thanks!
Albert van Bemmelen
June 14, 2021 at 8:08 pm
Yes true. Maybe when anyone posts the links to the schematics that would help. The small resolution photos however is also something that is Windows 10 related. Because Microsoft even downgraded many tools like removing the old great photoviewer. That even if we re-installed the good old photoviewer it apparently was removed later on again! And many obligated MS Windows upgrades are a pain in the B..T causing problems that were added instead of solved!
Parasuraman Subramanian
June 15, 2021 at 9:55 pm
Many thanks for your comments and more detailed info on resolutions!
Waleed Rishmawi
June 15, 2021 at 1:38 pm
again my friend a well done repair job and I like the fact that in every article you always clean the device before proceeding with the repair. I usually do the dusting and cleaning after the repair is done and not before unless the dust is really bad in the device and components can not be recognized. thanks for sharing and have a blessed day
Parasuraman Subramanian
June 15, 2021 at 9:53 pm
That's because I am using my front bedroom converted as service centre! Moreover, I dislike handling boards with dirt and dust! Many thanks for your comments!
Yogesh Panchal
June 15, 2021 at 2:38 pm
Good job! Sir
Parasuraman Subramanian
June 15, 2021 at 9:54 pm
Many thanks for your comments!
Mathew Charles Karonga
February 4, 2022 at 3:22 pm
Greetings honourable Parasuraman Subramanian
Well explained and well done.
Respeted Albert Van Bemmelen thanks for you contribution we acnt wait for you post again