Don't Miss

Fixing Blue Tooth/USB/FM Module In Sony Component System RV-5

By on October 30, 2020
how to repair hi-fi system Fixing Blue Tooth/USB/FM Module In Sony Component System RV-5

sony hifi  system repair

This Sony Component System Model RV-5 was brought by my son for replacing the broken speaker connectors and to add a Bluetooth/USB/FM module on the CD door, as he did not want to have the CD unit restored. (Sorry, I forgot to click the unit before carrying out the modifications!)

I opened the set, subjected it to a thorough cleaning. Removed the back cover, and fan unit to access the speaker connections on the main board. Desoldered and removed the connector. Fixed a four-in-one RC socket at the rear in its place ensuring that the inner portion does not touch the board or any other part nearby. Wired it to the main board. I provided a parallel connection of speakers to the other two RC sockets so that he can use two more speakers, if necessary. As the speaker wires were cut by a rat that managed to get an entry into his apartment, when he was away, I patched-up and joined these and covered it by heat-shrink sleeves. Checked the output selecting the tuner mode and found these to be working very well.

how to fix sony hifi

Removed a working Bluetooth/USB/FM module from its case, which I was using for testing Amps, removed the front panel and marked the sizes on the CD front panel. Then used special tools and file to make a suitable hole for fitting the unit from the front. My son helped me shape the hole and he did the major part of the filing job. Fixed it with screws. Then traced the input and power supply points of the connector that comes from the CD Unit. The Bluetooth module had its own 5V regulator to enable external adapter supply.

fixing sony fm module

I traced the CD mute pin of uController and cut the track, upon which the transistor controlling got released from its pull down. Then did a trial run, keeping the unit on the side, picture of which is the first one. It worked very well, except that the mute was getting activated with a pause in between, indicating that the uController was driving the mute through some other section.

Traced it to ‘Line-Mute’, and desoldered one end of the jumper wire, upon which it worked very well. The Tuner and tape modes were also working very well. Every graphic equalizer function also worked very well. So, fixed the front panel of the CD in its place, and soldered the input and power supply wires to the other end of the CD connector. Soldered only the wires required for these on the Board, as can be seen from the pictures given above.

how to fix and repair sony system

All these were possible mainly because a service manual could be easily downloaded for this model from the net.

Fit the CD panel in its place, which served as dummy, as the CD Unit behind it was removed permanently. I can perhaps salvage some parts if and when a need arise. Tested the set for hours and ensured trouble free working. My son was very happy (an electronic engineer himself) to have upgraded the good system, which was a gift from my elder brother. I saw him enjoying his favourite songs playing it through Bluetooth from his Mobile and Laptop. Here is a picture of the full system:

how to repair and fix sony rv-5

Mission accomplished very well and satisfaction got added to its collection!

This article was prepared for you by Parasuraman Subramanian from India. He is 70 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 repair article below:



  1. Lynn Blakely

    October 30, 2020 at 9:34 am

    Sir Parasuraman: As usual an interesting repair. It saves a lot of time having the schematic, and it didn't hurt that they printed the purpose of the jumper that took care of the mute problem. We like the end comment, "Mission accomplished very well and satisfaction got added to its collection!"

    • Parasuraman S

      October 31, 2020 at 12:17 am

      Yes, the schematic with details plus the print on the PCB really helped! Many thanks!

  2. Albert van Bemmelen

    October 30, 2020 at 2:22 pm

    -noticed a small text error in the end of your article where the text 'The 5V Regulator soldered to USB Socket' was probably copied and pasted into another sentence-.
    Anyway another interesting MP3 Bluetooth modification you added to an existing device creating a totally new Audio system!

    • Parasuraman S

      October 31, 2020 at 12:21 am

      Oh, my God! How did I miss to notice this! I shall request Jestine Yong to remove it! Some copying error! Many thanks for your observation and comments!

  3. Yogesh Panchal

    October 30, 2020 at 4:19 pm

    Good Modification and revive this old cassette player adding more options.

    • Parasuraman S

      October 31, 2020 at 12:21 am

      Many thanks, Yogesh!

  4. Humberto

    October 31, 2020 at 10:18 am

    Now this set has more functions than before.

    • Parasuraman S

      October 31, 2020 at 2:16 pm

      Yes, dear! Many thanks!

  5. Waleed Rishmawi

    October 31, 2020 at 6:26 pm

    again outstanding job. I never had the change to install a bluetooth module before. thanks for sharing

    • Parasuraman S

      November 3, 2020 at 8:35 am

      Many thanks!

  6. Saqib Sami

    November 2, 2020 at 10:03 pm

    Usually aux input ( audio inputs at front or back, in this model provided at left side of unit) are utilized for connecting mp3 module audio l r and gnd.
    But you did it new way by connecting to cd inputs. I really like this trick. Thanks for sharing this. Keepit up sir.
    Saqib Sami

    • Parasuraman S

      November 3, 2020 at 8:35 am

      Many thanks! Glad to note that it was found useful!


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.