Finally unit 2 is finished – or at least for the moment…
What was done?
- All capacitors replaced with new Nichicon and Elna Audio. A list of all capacitors inclusive part numbers for mouser.com is available in the download section
- Every panel got repaired and working fine. Still one segment on the LCD at the CD-player lights up
- The tape deck got a new gear (available in the download section, thanks to Virgil). For the future I need to print the gear with a resin printer since with filament it is not working as smoothly as it could
- CDM2 exchanged with donor from Philips CD150. Also capacitors replaced and new flexible lock for the flex cable
- Tape deck CPU replaced with AT1284P. Firmware is working fine and also some more features were added
- Firmware modifications for the tape deck
Changed behaviour:
- Music search supports up to 9 tracks when pressing next/previous. Original behaviour: only next or previous track
- Programming works differently. The tape rewinds when you start the program, not before. Also side B is supported! Therefore, up to 40 tracks can be programmed. Original behaviour: 20 tracks only one side
- The button “record” can be used to enable or disable record mode. In addition, the Stop key always disables the record mode. Original behaviour: Record button only activates record mode
- In Record-Mode the reverse key only allows the repeat mode A->B and does not show other reverse modes
New features:
- When pressing record and the tape reader recognises the tape is at the very beginning it moves forward until the tape really starts. Avoids to record music on the non magnetic part of the tape. During this procedure record is blinking
- In case of rewind, when the tape moves to the very end it moves back forward a little bit when on a splice of the tape
- Auto-Record mode shows the number of recorded tracks. Always wondered why Philips was not using the two digits and always displays 00?
Other modifications
- OpAmps of CD Decoder Panel exchanged with two OP275 from Analog Devices
- Pre-amplifier OpAmp replaced with LM4562
- Bluetooth sound module added to Aux channel. Automatically switches with a relay between Aux and Streaming. Supply separated by DC/DC converter.
Todo’s
- Replace the gear with a resin print
- Try to get rid of the one segment on the CD-LCD screen
- Update the replacement PCB with rev.B. which I am working on right now
Results
With the new capacitors and OpAmps the sound is now much clearer and instruments are clearly to notice. There is a feeling that the speakers now a bottleneck and the sound could be better. Will try to connect other speakers for further tests.
However, I am very happy that this sound machine is now fully working. It has been a challenge but I learned a lot and I am very confident to get the third unit fixed.
