Rejunevate RE'AN 48 points patchbay

I have 4 of these patchbays, which I purchased used. As time goes on, I encountered some bad connections, and even dead channels. So I decided to do a cleanup and deoxidize session.

The circuit

The Re'an patchbay has 24 balanced channels, based on 24 identical circuits. Each circuit has 4 stereo female jack socket; 3 of them are similar, the last one is slightly different to break the normalization when a jack is inserted in bottom front.

Front	Circuit of one channel	Back
2		1
3		4

Testing the patchbay

1. Grab a pen and some paper.
2. Select a source with a stereo headphone output (I used my Yamaha RX11), a stereo cable and a stereo headphone.
3. Remove the patchbay from your setup and repeat the following procedure for each channel.
4. Connect your source to position 1 and your headphone to 4.
5. Play your source: sound must be loud and clear, without gliches. Toggle slightly each cable, sound must stay clear.
6. Then connect your headphone to 2 and check.
7. Move your source to 4 and check again
8. Finally, check with the headphone connected to 3.
9. If you hear any glitch, note the channel and the defect your hear: drop of volume, one channel is deaf or both

Fixing the issues

Most of the time, the issue is localized in the bottom front socket.

1. Insert a jack in the socket; this will open the contacts.
2. Spray few drops of contact cleaner such as Deoxit D5 (or WD40, despite it's not a contact cleaner per se).
3. Test again.

Depending of the issue, you may need to slightly bend the contact down with a tool. The front contact is common to both channels.