ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I recently purchased a Beomaster 3400. Some pics are below with the exact model number, etc.
So far I' yet to have much luck firing it up.
Here's what has happened and what I've noted, maybe some clues to the problem lie here:
• The unit is connected to the mains using a travel adaptor (this will be my starting point of investigation...).
• When I first powered it on, the radio tuning light was functioning (just the one lamp that indicates the active frequency..
• No other lights lit up.
• After fiddling around with various buttons, the radio lights ceased to work. Unfortunately I can't pinpoint the moment this happened.
• I am in the US, I switched the voltage to 110v on the base of the amp.
• I do not have a speaker set attached.
• There is a very low freq. hum audible when the unit is on. It appears to be getting power, but nothing is lighting up.
• There is a low frequency humming (very faint) in my headphones when turned on. This hum increases as you turn up the volume on the amp.
• I played a record with my Beogram 4002 connected to the stereo input. With the volume turned up to 9 or 10 on the amp, it is possible to hear the record play very softly.
• The back of the unit got slightly warm after I was fiddling around like this for about 20 minutes.
- -
So, given the above, can anyone recommend a place to start looking to diagnose and repair the problem?
Many thanks.
H
First thing would be to replace the small rectifier on the board near the voltage regulator.
That wood veneer - is it a self-adhesive material stuck on ?Or maybe the cabinet was replaced at some point.Normally, all Beomaster 3400s with natural colored aluminum surfaces have white cabinets (and are as such quite rare).
Martin
Dillen: First thing would be to replace the small rectifier on the board near the voltage regulator.
Dillen: That wood veneer - is it a self-adhesive material stuck on ? Or maybe the cabinet was replaced at some point.Normally, all Beomaster 3400s with natural colored aluminum surfaces have white cabinets (and are as such quite rare).
Or maybe the cabinet was replaced at some point.Normally, all Beomaster 3400s with natural colored aluminum surfaces have white cabinets (and are as such quite rare).
Unfortunately I do not know the complete history of the unit. While I'm yet to take it apart, it looks like the cabinet has been replaced rather than having a veneer applied.
I know it's not "original", but I'm fond of the wood/aluminium combination.
Hamish
Hi Martin
Im renovating a Beomaster 3400 at the moment.....
Which rectifier do you mean? I see a big plastic rectifier just behind the trafo and there a voltage regulator there as well - both attached to the rear of the chassis. That one?
Hilsen Torben
The user guide is on site but you need to be a silver or gold member to acces it. There is only a circuit diagram in the service manual section - I'll see if I have the service manual.
Peter
Just checked - I don't have the service manual - I think I had one but may well have given it to Craig.
No, it's a small round type (1cm diameter and black), sitting on a circuitboard in front of the transformer.
ahh the small rectifier brigde….thanks :-)
Hi
I am further, and my beomaster 3400 is playing. I had to change all pots because of noise and corrosion.
But i cant find a replacement for the volumepot, which have 8 pins - i can only find standard 6 pins pots.
The pot is noisy and some pins are “hanging in a loose thread”.
Does 8 pins exist, or can a 6 pins be installed?
Finding the right types to replace with would be next to impossible - particularly the ones for volume and balance.The balance potentiometers are antiparallel with channels working in opposite directions but only from the center out towards their respective ends and with zero for both channels at the center.The two extra pins at the volume control potentiometers are for the Loudness function - and the volume potentiometers are semi-logarithmic types.- And it's two stereo potentiometers (to provide volume control for all four channels).
Normally you don't replace the potentiometers. You take them apart, clean them and put them back together.The ones used in Beomaster 3400 are not the worst ones to restore, as they come apart by losening small holding pawls.If you cannot restore the original potentiometers, let me know and I'll look in the dungeons for some that can be restored.