help with Sansui BA5000

bblock1970 · 9th September 2004, 08:28 PM

Hello,

I have a strange problem with a BA5000. When you initially fire up the amp the right channel functions properly but the left channel does not product sound.

If you unplug the input conectors and switch the left and right channels back and forth causing a ground "pop" the amp functions perfecly. It may stay fixed for 1/2 hour or it may be fine all day.

It seems if you keep the levels up tis will be better longer.

Any idas.

Thaknks for your input

Russ

cunningham · 9th September 2004, 10:12 PM

sounds like a loose wire or component to me. If a componant was damaged, it probably would have this problem all the time.

jleaman · 10th September 2004, 02:27 AM

start with pulling it apart to the rca section and resolder the rca conectors on the back maybe around the circuit boards too. : O ) got a picture too ?

anatech · 10th September 2004, 03:58 AM

Methinks you may have oxidized relay contacts. With any luck, not burned yet. Check by turning the unit on and tapping the speaker relay. If this is it then ....

Take the top off the relay, release the spring carefully. Remove the moving contact (attached by wires, do not detach). Get a business card and soak with contact cleaner, not tuner cleaner. Rub the contacts, both moving and stationary. Follow up with cleaner such as Electrowash 2000 (non-residue) and reassemble. If the fault is still there, replace the relay.
-Chris

bblock1970 · 10th September 2004, 04:29 PM

Thank you for the input. I will try those things. Are the meters before or after the output relays? The meter on the bad channel does not read. This may tie down the problem. I will let you know how the suggestions work. Keep them coming.

Thanks

Russ

anatech · 10th September 2004, 08:35 PM

Hi Russ,
It souds like the meters are after the output relay. I don't have the schematic so I can't say for sure.
-Chris

9th September 2004, 08:28 PM	#1
bblock1970 diyAudio Member Join Date: Sep 2004 Location: detroit MI	help with Sansui BA5000 Hello, I have a strange problem with a BA5000. When you initially fire up the amp the right channel functions properly but the left channel does not product sound. If you unplug the input conectors and switch the left and right channels back and forth causing a ground "pop" the amp functions perfecly. It may stay fixed for 1/2 hour or it may be fine all day. It seems if you keep the levels up tis will be better longer. Any idas. Thaknks for your input Russ

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9th September 2004, 10:12 PM	#2
cunningham diyAudio Member Join Date: Jun 2004 Location: Knoxville	sounds like a loose wire or component to me. If a componant was damaged, it probably would have this problem all the time.

10th September 2004, 02:27 AM	#3
jleaman Banned Join Date: Apr 2002	start with pulling it apart to the rca section and resolder the rca conectors on the back maybe around the circuit boards too. : O ) got a picture too ?

10th September 2004, 03:58 AM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Methinks you may have oxidized relay contacts. With any luck, not burned yet. Check by turning the unit on and tapping the speaker relay. If this is it then .... Take the top off the relay, release the spring carefully. Remove the moving contact (attached by wires, do not detach). Get a business card and soak with contact cleaner, not tuner cleaner. Rub the contacts, both moving and stationary. Follow up with cleaner such as Electrowash 2000 (non-residue) and reassemble. If the fault is still there, replace the relay. -Chris

10th September 2004, 04:29 PM	#5
bblock1970 diyAudio Member Join Date: Sep 2004 Location: detroit MI	Thank you for the input. I will try those things. Are the meters before or after the output relays? The meter on the bad channel does not read. This may tie down the problem. I will let you know how the suggestions work. Keep them coming. Thanks Russ

10th September 2004, 08:35 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Russ, It souds like the meters are after the output relay. I don't have the schematic so I can't say for sure. -Chris

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