Philips 612 Ultrasonic Jewelry Cleaner User Manual


 
4535 612 34161 HD3 Service Manual Page 148
CSIP Level 1 Troubleshooting: Symptoms, Causes, and Corrective Actions
Is the interference intermittent or constant?
Does the interference appear with only one transducer or with several transducers?
Do two different transducers operating at the same frequency have the same problem?
Is the interference present if the system is moved to a different location in the facility?
Can the EMC coupling path be attenuated?
Does operating an AM radio tuned between stations around 1,600 Hz (thus using it as an
EMI/RFI source tester) identify interference, which would be noticeable as audible static
noise on the radio while walking it around the room. Sometimes EMI/RFI sources are not
constant, but are temporary or surge situations that may only occur at certain times.
Considering and locating the source/cause is important, but regardless of the source, since
the system is shielded against EMI and RFI, troubleshoot the system to determine if the EMI/
RFI shielding has been compromised. One place to start is to verify that all the system panels
are appropriately secured with all of the factory-approved fasteners.
System Hangs
or Crashes
Often the terms “hang” and “crash” are used interchangeably to describe the same symptom.
However, these two terms describe two different behaviors. It is important to understand the
difference between these terms because the causes are different, the troubleshooting techniques
are different, and the information available to the FSE is different.
A “hang” is when the system stops responding to the keyboard. There is a normal image on the
monitor and the system may continue to be working (updated data in the image area, clock is
correct and continues changing), but the system does not respond to hard keys, soft keys, or the
trackball.
There is not any specific data associated with a “hang” (because from the software point of view,
everything is behaving normally. The best source of information is to ask the customer about the
keystrokes prior to a “hang.” Also check the Keystroke Log.