uniphy PHYACTION 190, Информация о сервисе

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5. TROUBLE SHOOTING Service information Phyaction 190 / 190i - Page 12
CHAPTER 4
TROUBLE SHOOTING
4.1 Introduction
If a Phyaction 190 is defective, in most cases the unit will detect an error in the automatic self test. A full
description of this test will therefore help the service technician in finding the error. In the next paragraph you
will find this description. Some errors may only occur during normal operation, so you will also find the tests that
are carried out during normal operation in that section. To give the service technician some extra tools for
trouble shooting, Uniphy has developed a special service menu with features specially for service operations.
This service software is described in section 4.3. Finally in Appendix 3 you will find a list of all possible error
messages and possible causes.
4.2 Description of the automatic selftest
This paragraph describes the internal self test of the Phyaction 190, the (critical) error messages and the
possible cause of the errors.
The following categories of errors are identified:
- Errors during self test
- Errors during normal use
- Software
errors
If simple errors occur that can be corrected by the user an error message appears on the bottom line of the
display. These messages show the kind of error and a possible solution. These errors are described in the user
manual. Errors that cannot be corrected by the user are displayed as shown in figure 4.1 (where the numbers
are randomly chosen).
The error codes presented after 'Code:' are described in paragraphs 4.2.3 and 4.2.4. In some cases the
hexadecimal number after 'Value' gives additional information about the error. The error address indicates the
address of the routine where the error occurred. The hexadecimal values after 'Stack:' represent the position of
the stack pointer and the contents of the stack, showing the value of the program counter when the error routine
was called.
If the error routine detects that the LCD display is not functioning properly, or if the display is not yet initialized,
the buzzer will be activated a number of times. The number of beeps indicate the type of error (see also
paragraphs 4.2.3 and 4.2.4)
4.2.4 Error shutdown procedure
If the processor detects an error that cannot be corrected by the user, the complete ultrasound unit is put in a
safe condition and the processor will enter an infinite loop in which normal operation is not possible. If an error
is encountered that the user can correct, it will depend on the kind of error whether the ultrasound unit is
switched off or continues working.
The following shutdown procedure takes place:
- The red ERROR-LED is switched on
- The Fan starts working
- The buzzer will sound for approximately half a second
- The duty-cycle is set to 0
- The ultrasound voltage is set to its minimum value
Figure 4.1, Error message