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NEXO NX242 DIGITAL TDcontroller Service manual rev100606
P.7
Hardware problem on NX242 s.n. 3880 to 4049
Abstract
This document deals with a hardware problem that can be found on any NX242 from serial number 3880 to
4049.
The symptoms of this failure is the following:
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Crackles on the outputs patched on the A Input of the NX242 that can be very audible.
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Blinking of the Sense green LED even without amplifier connected.
Please note that in case of emergency it is always possible to use the B input of the NX242 that does not
present noise.
Also note that in most of the cases, the noise disappears after a few minutes (after the NX warmed up).
The solution to solve this problem is to remove faulty capacitors on the NX242 PCB.
Hardware correction
Finding and removing the C1516 component
The C1516 component has been soldered on a few NX242 from serial number 3880 to 4049. In most of the
cases, this component is not present on the motherboard. If not, please go on to the next chapter.
Locate the C1516 component inside the NX242.
The C1516 is a SMD capacitor.
Here is a closer look on the C1516 component, near the connector for the RS-232 Interface.
