They can be fixed in most cases.They do suffer with leaking/exhausted caps,particularly the small low profile 47uf.

I've also come across problems with the upc interface ic(ic3).If there is staining to the pcb,which looks like water marks,suspect the ic.It's a smt device,but it is possible to replace with time and patience,and of course well worth the effort.

Regards,

Nick

Thanx, I will try to change some caps at first, and see what happens ;)

IC3 I have changed some years ago, but that was because the tuner did not work at all, it thought it was a japanese version, but that fixed the problem, I think this might be caps only problem..

/Weebyx

Already fixed?

If not: i found on several tuner boards (and the tuner box itself...) missing solder joints. Surprisingly these boards worked for quite a while...

I will change all caps this weekend, and see what happens, but will look for missing/bad solders also.

will keep you posted :)

/weebyx

Ok, So I have now changed ALL caps, but no difference at all..

The tuner can play radio if you enter the freq manually, but only in mono, it cannot find ANY stations by itself...

I guess B&O really was serious when they wrote "The unit is a single unit, in case of failure replace the unit. However the list of components are specified under the parts list", in the service manual :)

/Weebyx

Hi,

if tuned manually to a strong station in FM do you get the station name via RDS? If so the HF and IF part of the tuner module should be ok.

Can you manually switch to stereo if you connect the point between R102 (39K) and R56 (1K) to ground?

Does PIN 14 of IC3 (LC7218) toggle from high to low and vice versa if you switch mono to stereo?

I hope this helps a bit

RaMaBo wrote:

Hi,

 

if tuned manually to a strong station in FM do you get the station name via RDS? If so the HF and IF part of the tuner module should be ok.

 

Can you manually switch to stereo if you connect the point between R102 (39K) and R56 (1K) to ground?

Does PIN 14 of IC3 (LC7218) toggle from high to low and vice versa if you switch mono to stereo?

I hope this helps a bit

My unit does not have RDS, so this I cannot test. I will test the other tonight, but I might just order a new LC7218.. apparantly these IC's have issues, had to change one some years ago, where the tuner thought it was japanese. That was fixed by the new LC7218..

So maybe some part of the IC is dead or very weak ?

/Weebyx

RaMaBo wrote:

Hi,

 

if tuned manually to a strong station in FM do you get the station name via RDS? If so the HF and IF part of the tuner module should be ok.

 

Can you manually switch to stereo if you connect the point between R102 (39K) and R56 (1K) to ground?

Does PIN 14 of IC3 (LC7218) toggle from high to low and vice versa if you switch mono to stereo?

I hope this helps a bit

Pin 14 is always high (6,2v and measured between pin 6 as ground) no matter what the display says when tuning and manually changing from Mono to Stereo.

So maybe this IC is done for ?

/Weebyx

If pin 14 is always high the stereo decoder is forced to mono.

Do you get a stereo signal to hear at the headphones / speakers if you pull the connection of R104 (39k) and R65 (1k) to ground?