Beomaster 6000 quad

[dahiyas]

Last summer I acquired a Beomaster 6000 quad, condition unknown. I dismantled the unit completely. Recapped all the boards and trimmers (thanks Martin !!), replaced all the bulbs and then went into hibernation. I restarted the project this weekend.

I started putting everything together (out of chassis)..applied power (with DBT)…no smoke..

Things I could do –

1. Power supply adjustments – 18v/5v
2. No-signal current – 14.4mV

Issues –

1. When power is switched on, system does not start from standby mode. Instead all lights are on for the volume/tone/balance. Pressing standby does not do anything. Pressing source lights up the correct lamp but lamp switches off after I release the source button. This is true for selecting any source or prog buttons.
2. Pressing the switches for volume/tone/balance does not do anything. I know that the motor was engaging at some point but stopped. I will check for loose connections.

Any guidance on what I should be looking for ?

Thanks !!

My B&O Icons:

[dahiyas]

some progress.

I spent an hour checking all cables were reconnected in the right place and were not loose. I am not sure what I did but the source selection/standby buttons now respond. I also learnt (from youtube) that the volume/tone/balance lamps stay on even in standby. So looks like issue 1 is fixed.

Problem 2 persists but I figured that pressing any of the DOWN buttons does start the motor but the clutches don’t engage. Pressing any of the UP buttons doesn’t do anything.

 

My B&O Icons:

[hcraig244]

Check all the black wires that run all over the machine, common negative, these wires are for some reason, best known only to the B&O design team, single strand wires and break easily…they dont solder too well either…i have had several issues with the point in the chassis where a whole bunch of these come together….take a look ;¬)

Craig

[dahiyas]

Thanks Craig..I did check all the wires again. And all the wires seem to be ok but I will go through them again.

Also, FM is still an issue. On pressing FM/P1-5 buttons,  the indicator lamp comes on but goes off when you release the button. The other sources work fine.

My B&O Icons:

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