Note #: 0853
Product: ES1/EC1
Version: serial numbers between 3000 and 4000
Date Added: 05/29/09
Issue:
ES1/EC1 speakers experience a 30dB SPL drop across all frequencies resulting in performance below specifications. Over time or with exposure to high temperatures the adhesive holding the copper foil shielding in place can fail. This may result in contact with the grounded bolts of the ES1/EC1 housing causing a short circuit.
Solution:
If you experienced this problem, contact TDT to request an RMA.
Workaround:
To fix this issue:
Power off all equipment
and devices and disconnect the ES1/EC1 speaker completely.
Remove the mounting
post from the ES1/EC1 using a Phillips-head screwdriver to gain access
to the copper foil-wrapped transformer.
Bind the copper foil
shielding using one of the suggested methods:
Wrap an orthodontic
rubber band around the base of the transformer to hold the foil.
Use an epoxy adhesive
or glue to bind the foil.
Wrap electrical
or scotch tape around the transformer to cover the foil.
Once complete the foil
should no longer be in contact with any of the grounded bolts on the base
plate of the ES1/EC1 speaker.
Reattach the mounting post.
The following images can be used for reference.
Here adhesive holding the foil has failed resulting in a short circuit.
The rubber band has secured the foil which is no longer in contact with the grounded bolts.