Beomaster 6500 IR Transmitter issue

4 replies
D(
Offline
dtarnowski (archived2)
Bronze
Posted June 8, 2017 at 10:48 GMT
#2086353

Guys, I need a help :( During maintenance work on my BM6500, I’ve drop screwdriver and caused short circuit with some sparks. In effect, the 2 way communication lost part of functionality. I feel like a fool,  but accident is accident. 

In general BM is working with Beolink 1000 and 7000 in one way mode. BL7000 is showing no contact for 2 way. Everything is set to Option 1. 

Standby diode is responding to remote signals I mean blinking for accepting IR codes from remote and then blinking again for respond, so I suppose that sending signal is not proper/weak. 

I’ve checked symptom with MCP too. Here MCP is not able to send/read anything. I’ve checked remotes with BM5500 and I’m sure, they’re working fine.

Then I’ve replaced front panel in BM6500… ant there’s still no contact. On processor board checked bad solder joints, replaced old capacitor and checked diodes. Cleared and checked NVRAM in test mode. IR and RAM tests passed correctly, but still don’t have proper answer from BM to MCP/BL.

 

I have no idea where find more issues. 

I’ve a plan to replace all transistors on processor board, physically and reset IC2 by shorten 8th pin, but need some advice anyway, what else could be wrong.

Maybe some of you have not necessary processor board for BM 6500 to sell? Or whole BM for parts?

 

Thanks in advance!

D.

 

WE
Offline
Weebyx
Bronze
Posted June 9, 2017 at 10:46 GMT
#2086354

Where did you drop the screwdriver, and from where did the sparks come ?

If I recall correct, then the IR sender module get ekstra voltage directly from the power supply. Maybe you need to measure if the sender pcb gets correct voltage ?

 

/Jacob

D(
Offline
dtarnowski (archived2)
Bronze
Posted June 9, 2017 at 15:42 GMT
#2086355

On electronics, It's rolled through Microprocessor board to board no 2, and YES Jacob, your'e absolutely correct!

Yesterday I've found current loss. On 6th pin of P14 socket should be 40V. In my case is about  4 and something. Initially I was sure that problem is on Rectifier diode. After replaced D10 and Capacitor 47microF, there's still no change. When I'll come back to home, I'll need check R18, because don't remember what's AC current on that, but if I remember correctly, might by low too. On Transformer 30VAC is fine. 

D(
Offline
dtarnowski (archived2)
Bronze
Posted June 9, 2017 at 18:56 GMT
#2086356

Update: I've replaced R18. Curret is 42V and 2way is back, but in very short range...about 10-15cm. Im trying to figure out what is responsible for so small distance. 

No matter which front panel and processor board is used. 

or
BeoWorld Gold Membership card
Join BeoWorld

Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.

Become a Member

December 2026 Prize Draw

Gold Members Only

As a Gold member you're automatically entered into our exclusive prize draw — your chance to win iconic Bang & Olufsen products. A unique benefit of BeoWorld Gold membership, every draw brings a new opportunity to win something special.

View Prize Go For Gold