Dear DCX3 Owner,
We have found a series problem with DCX3 DC-DC power supply modules.
if you have not applied power to the DCX3 DC-DC yet, please DO NOT use it
until you have read this email and have taken the necessary steps to correct
DCX3 has a problem when the initial power is applied to it. The noise
generated at the instant the power is applied to the input terminals causes
unpredictable behavior in the power supply controller output. This behavior
sometimes damages the output stage of the power Supply. Depending on the nature
of the device failure the input fuse may or may not open or the input may be
shorted to the output in this case it will cause damage to the loads.
If your DCX3 is already powered up and running then there is no concern at
the moment. But, When you disconnect the input main power (battery) then
the above modification MUST BE DONE BEFORE YOU REAPPLY
THE MAIN INPUT POWER to the DCX3 unit.
The following modification will solve the above problem. Please take action
immediately to solve the problem. If you are not able to do the following
modification and/or if your unit is already damaged then please send it to:
OPUS solutions, Inc.,
Laguna Niguel, CA 92677.
Please include your return address, telephone number, the invoice # and date
with a heading on the note "RMA-DCX3". If your unit is already damaged please
indicate with a note "Damaged" on the bottom of the note.
We will repair the unit/s and/or modify the unit and return it back to you.
Refer to the attached drawing for reference/ detail
Please observe STATIC PRECAUTION when performing the following modification
and during installation. Ground and discharge the body static charge before
performing the following modification.
The modification is simple if you or some one you know with good soldering
skill. You will also need a tweezer for handling 0805 resistor chip.
You will need a 15K or 22K ohm 5% - resistor. If you need it we can send it
The problem is solved by installing / soldering a 22K ohm 5% -0805 size
resistor between the TP2 pad (Round pad) and top pad of D15 (Square pad).
These components are located just above and just right of the printing "
PATENT PENDING " on the DCX3 Printed circuit module.
Please reply the email with the following questions answered.
My power supply is: Working, Defective or don't know
If defective, please explain the nature of the failure,
How and when you noticed the problem.
Modification will be done by : OPUS or me
If you are performing the
modification then do you want
us to send the resistor: Yes/NO
If Yes, Please provide your mailing address and telephone #.
We apologize for the inconvenience and the trouble.
Opus Solutions, Inc.
Laguna Niguel, CA 92677