Home  Resources  References  Tubes  Forums  Links  Support 
Sonora RZLU222 Bad Speaker
11/23/2005 12:55:05 PMStan L
In diagnosing this radio, discovered that the speaker appears to be bad. An ohm meter connected acros the terminals shows no resistance. Can it be fixed? If so, how? Thanks!!
11/23/2005 1:32:50 PMDoug Criner
Is this the schematic: http://techpreservation.dyndns.org/schematics/47/47_Sonora%20Radio_RZU_142.djvu This is an AC/DC set with a permanent magnet speaker. But the schematic doesn't show the physical arrangement of the speaker/output xfmr.

Stan: Check to see if it's the speaker voice coil or the audio output xmfr that is open. (Sometimes the output xfmr is mounted on the speaker itself, sometimes on or under the chassis.) To check the voice coil or the xfmr secondary, you'd need to disconnect one of the leads from the output xfmr secondary to the voice coil.

If an ouput xfmr winding is open, you can replace it and keep the speaker itself. If the speaker voice coil is open, then you'll need a replacement speaker.

11/23/2005 3:44:21 PMStan L
:Is this the schematic: http://techpreservation.dyndns.org/schematics/47/47_Sonora%20Radio_RZU_142.djvu This is an AC/DC set with a permanent magnet speaker. But the schematic doesn't show the physical arrangement of the speaker/output xfmr.
:
:Stan: Check to see if it's the speaker voice coil or the audio output xmfr that is open. (Sometimes the output xfmr is mounted on the speaker itself, sometimes on or under the chassis.) To check the voice coil or the xfmr secondary, you'd need to disconnect one of the leads from the output xfmr secondary to the voice coil.
:
:If an ouput xfmr winding is open, you can replace it and keep the speaker itself. If the speaker voice coil is open, then you'll need a replacement speaker.
11/23/2005 3:46:03 PMStan L
::
The output transformer is good because it will drive a test speaker, so sounds like the speaker needs to go. Thanks!
Is this the schematic: http://techpreservation.dyndns.org/schematics/47/47_Sonora%20Radio_RZU_142.djvu This is an AC/DC set with a permanent magnet speaker. But the schematic doesn't show the physical arrangement of the speaker/output xfmr.
::
::Stan: Check to see if it's the speaker voice coil or the audio output xmfr that is open. (Sometimes the output xfmr is mounted on the speaker itself, sometimes on or under the chassis.) To check the voice coil or the xfmr secondary, you'd need to disconnect one of the leads from the output xfmr secondary to the voice coil.
::
::If an ouput xfmr winding is open, you can replace it and keep the speaker itself. If the speaker voice coil is open, then you'll need a replacement speaker.


© 1989-2025, Nostalgia Air