Needed to clean the muting contacts, here goes.
Before starting, take of the pickup and platter, secure the pickup arm with a piece of tape to the top board. Secure transport screw, turn to stop and then one turn CCW
Place 4 pieces of wood, cups or whatever, some 7-10 Cm. high, as support for the deck upside down. Place deck on supports, take of bottom cover.
Take of E-clips, red arrows. Unhook relay box and wires. Take of lamp housing, take lamp out of housing and sneak it out under swinging chassis.Green arrows. Place it all to the right side, outside the swinging chassis.
Unhook steel wires, Blue arrows
Unscrew adjusting screws, Yellow arrows
Desolder all wires, White arrow
Take of the arm for pickup arm lift and the big white gear wheel, push out pin for the flywheel gear, press down on the flywheel and it comes out.
Lamp assembly
Gears
Wires desoldered
Turn the deck around to upside up, take of the counter weight, unscrew it until end of screw, then pull until it comes of, mine was sitting very hard, because of damaged arm and weight, had to file and sand until it came on very smooth.
Unscrew Allen screw 2 turns, pull off arm, Be careful with the wires, they have to come out easy and without strain, help with pushing from below.
You can now turn the deck again, or take out the arm shaft, to clean and lubricate, mine was totally dry.
To take out the shaft, mark the position of the arm, there is a steel ring with a hole for the Allen screw, mark the hole with a permanent marker, and then when the shaft is out, make a mechanical point in the middle of the mark.
Arm off, steel ring off
Now press, from below, the shaft upwards and pry off the E-clip, warning they tend to fly away never to be found again.
Keeping a finger on below the shaft , press it down some 5 Mm. and then up again, take off the nylon ring and the funny steel ring, in there you will find 3 very small steel balls, take them out with a magnet or a magnetized screwdriver, dont loose them, nearly impossible to get new ones.
Pull shaft down and out
Check that the transport screw are one turn loose, turn the deck upside down, turn out the transport screws, the plates for chassis springs goes through the holes, no need to take the springs off. Place the swinging chassis upside down, and you will see the muting contacts
Here the contact, I measured megaohms, Kohms and Ohms, opening and closing several times, thats where the noise, on start and stop to the speakers, came from.
I use Deoxit from a bottle, dip a paper strip into it and place between the contacts, leave for 5 min. and clean the same way, pulling a paper strip with ISP between the contacts, I repeat this until the paper comes out clean, then I cleaned off the oxidation on the upper side. Checked again with the Ohm meter, no problems, 0 to 0.3 Ohm several times on both contacts. To get it all back together again, start here.
Here a pic after soldering the wires and a new 5 pin plug.
I put everything back in place, connected to my BM 4000 and the noise at start and stop is gone, but to cry for, my SP14 is gone, no sound in the right channel, tested with my BM 5000, same failure. so Axel will get more work.
My deck just went from USD 40.00 to some USD 160.00
Location: Mexico city
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050
