About 1 year ago I bought in DK a BM 1000 together with a BG 1000, these are the same models as the ones I bought new in 1969, I bought these only for sentimental reasons 😁. I went to DK in May this year to bring both items to Mexico. My son (now living in DK) fell in love with the BG 1000, so I had to leave it in the father land. So the only items I had to bring over here was the BM 1000, a Master de Luxe Present 608 a gift from Martin (more later on this one) and some cartridges from Axel and 1 bought locally in DK.
Here the cleaning story of the BM 1000.
First of all the number, (Martin always want numbers)
The BM is functioning OK, but no lights, so I started taking it apart for cleaning and components needed for rebuilding. Bottom cover comes off with, unscrew 2 screws one side, loosen 2 screws on the other side, pull the cover to the side and lift it out, save the 2 insulation strips. the top cover comes off by unscrewing 2 screws on each side, through holes in the bottom frame and one in the middle of the bottom cover.
Turn the BM around lift of the top cover, here also the the knobs off, pull off, no screws to hold them.
Frequency scale comes off with 2 screws
Then the piano keys came off, also 2 screws
Dusty and dirty.
Both side keys out
The scale background comes out, bending the 3 clips and lift it out, fumbling a little.
To get off the front face pull off the 2 clips. red arrow.
And then unscrew the 4 screws 2 right side 2 left side
Then I took out the lamps, here a pic with scale and different items, the black piece above the lamps is a reflector, remember the placement of that one.
I found out, that the bottom frame with front cover also had to be dismantled
As the keays was working sluggish I wanted to give them a good clean, so the scale drive had to come out too, 2 screws front and 2 screws in the middle frame wall
The big cap comes loose with 1 screw from the bottom, lift it up without braking any wires
To lift up the switch assembly, I had to unscrew 2 screws at the bottom and take out the sidewall, transformer side, unscrew 2 screws holding the transformer from the bottom, the switch assembly has 2 pegs sitting under the inside division wall, loosen 1 screw from the bottom, lift it a little and the assembly comes out, be very careful not to break any wires doing this
Look at all the dirt in there, here the other side, this one comes out easily, just unscrew 2 screws from the bottom, wiggle out the assembly, 👍 wires !!!
All the innards was dirty like this
I normally clean it all with a brush and Isopropyl alcohol, but this time I selected to do it with a spray bottle (one of these with a finger triggered pump, that comes with detergent in it), I cleaned the bottle and filled it with IPA, and then sprayed off all the dirt, sprayed a lot into the switches and potentiometers, when good wet I worked all the switches off and on many times, and then a lot of IPA again. The main PCB got a spray and left it to soak a couple of minutes and then sprayed it again until clean. All clean. Give the switches a small drop of grease before attaching the keys.
Now ready to assemble it all again, I thought I could put in the piano keys just like I took them out, but no such luck, I had to attach them one by one
To get them off the steel angle, press down and out on the middle peg (red arrow), and they come off easily, clean, and after positioning the steel angle its easy to assemble one by one. I gave the middle pegs a drop of oil before attaching
All in and ready to connect and adjust the 30 volt feed and the idling current.
The 30 volt feed was down to 24 V and the idle current down to 5 mV, adjusting was very difficult, but after moving the trimmers a bit I got it. The trimmers will be changed with new ones later on, as will lamps and caps., after that I put in the stereo decoder and the rest of the covers, played some different FM stations, checked all functions and switches, had to readjust key positions, but it all works, then connected a BG 1202 and that too worked as it should. Finished
Connecting my type M speakers I saw this little reminder, and that made me think of the new devises you buy today, with some hundreds of watts displayed
Here the other (older) BG 1000 (Piaf (Jeff) has one
Will come back here after changing components.
Location: Mexico city
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050
