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.
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You may check on his previous article on Ikon Induction Cooker Repair