BM900 repair - fixing aerial coils

4 replies
O(
Offline
Ozymandias (archived2)
Bronze
Posted January 22, 2014 at 01:07 GMT
#2247512

Hi,

Does anyone have best practice pointers on how to repair broken connections on these very fine copper wired aerial coils....??

As a result of breaks, the wires do not reach the original soldering points on the PCB anymore. Do I try to unwind more wire from the coil or solder in a make-up length of wire to reconnect to the PCB or completely replace the coils with new ones....??

Any help appreciated.

Regards,

Duncan

DI
Offline
Dillen
BronzeModeratorFounder
Posted January 22, 2014 at 07:03 GMT
#2247513

In my opinion a repair attempt is always worth trying before eventually replacing.
If a piece of copper wire (cut component lead or similar) is what's needed to extend the remains, I'm sure it will be fine.
I would not recommend unwinding the coil. You will most likely be facing a labor intensive job of realigning if you do.

Martin

E(
Offline
essence (archived2)
Bronze
Posted February 5, 2014 at 08:16 GMT
#2247514
On the rear of the chassis is the B&O logo and model number, and sockets to connect accessories including a record and tape player and external loudspeakers. A white electrical cord and plug extends from the rear of the casing. 4 rubber feet elevate the radio from the surface on which it is positioned. The radio casing is closed with 2 screws. Inside the casing, there is a dual-channel audio amplifier for reproduction of stereo gramophone records that deliver 2 × 5 watts of undistorted power output. The radio is prepared for single transmitter broadcasts, and has a B&O multiplex adaptor (stereo decoder). Hope this helps.
K(
Offline
Killmouski (archived2)
Bronze
Posted February 5, 2014 at 12:58 GMT
#2247515

essence wrote:
On the rear of the chassis is the B&O logo and model number, and blah bla blah ....
 Hope this helps.

Im sure it helps a bunch telling the op that there is a power cord and a b&o logo
at the back of his radio and wouldnt you think that he found out about
the number of screws long before he ran into the coil problem?

or
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