Beocenter 7002 VU indicator fault

6 replies
J(
Offline
johnpc (archived2)
Bronze
Posted May 2, 2015 at 10:43 GMT
#2202226

This BC7002 has been working without fault for 6 weeks.  Today I noticed the vu leds were on when playing a record or when using radio, this was intermittent and did not bother me.

Then when playing tape fault happened all LEDs lit and a loud Machine Gun effect on the audio.

I have disconnected set from mains supply for 5 minutes, but same intermittent results when plugged in again.

I see C9 C10 C11 could cause the fault and I intend replacing them first.  The display is not always "full on" with red LEDs flashing, sometimes 1 green LED is on, sometimes more are on. 

I have had a lot of time looking at the circuit and can not find where the wires from Plug 29 go. Had a good look on Diagrams 2 and 5. help please.

I do not want to do a blanket change of caps, Could  dirty contacts on a relay cause this fault?

I have never tried to set the timer for the tape.

Any Ideas of fault before I open set up.

   TFL, John.

 

 

 

DI
Offline
Dillen
BronzeModeratorFounder
Posted May 2, 2015 at 18:33 GMT
#2202227

Replace the two relays on the tape controller board as the first thing.
They are known troublemakers.

Martin

J(
Offline
johnpc (archived2)
Bronze
Posted May 2, 2015 at 19:31 GMT
#2202228

Thank you Martin, Don't these relays respond to cleaning contacts?

   John.

J(
Offline
johnpc (archived2)
Bronze
Posted May 3, 2015 at 11:13 GMT
#2202229

Hi Martin, Before I open set, can you supply me with two relays?

   John.

DI
Offline
Dillen
BronzeModeratorFounder
Posted May 3, 2015 at 19:39 GMT
#2202230

That depends on the exact type used.
Start with a blast of contact spray. It will not be a lasting solution but it will tell you if you're on the right track.

Martin

J(
Offline
johnpc (archived2)
Bronze
Posted May 4, 2015 at 17:56 GMT
#2202231

I think I have cured problem with switch cleaner, just hope I have not spoken to soon. Both relays have part no 7600045 relay 6v. Two different relays were fitted,  one had markings "Type C2V-2  6volts   the other looked vey similar but height measurement was different, and no markings.  Any one know coil resistance ?   I know I should have measured when I was there.

 

   John.

   

 

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