Errors 80-83 (Microprocessor Chip Errors - Planmeca Proline EC pan Technical Manual

ERROR MESSAGE EXPLANATIONS
Er 72 Keyboard processor program memory failure
Er 73 Keyboard processor program error
Er 74 Keyboard processor operating improperly
NOTE
Er 75 Keyboard processor operating improperly

3.9 Errors 80-83 (microprocessor chip errors)

Er 80 Keyboard processor EEPROM failure
Er 81 Generator processor EEPROM failure
Technical Manual
At power up the keyboard processor calculates a check sum from the program memory cir-
cuits (EPROM). If it doesn't match all operation is ceased and an error code is displayed. If
the EPROM is (are) completely broken it is obvious that this kind of error code cannot be dis-
played but more likely the equipment does nothing. This error indication is merely meant to
detect a single EPROM failure before complete break down.
- The keyboard processor EPROMs are to be changed immediately
If the keyboard processor detects an illegal command (from EPROM) it will stop and give this
error indication. Most likely faulty component on the keyboard processor board. A single haz-
ardous code error is also possible.
- If appears more than once, replace keyboard processor board.
There is a so called watchdog circuit both in the generator processor and in the keyboard
processor. If the microprocessor does not perform its program but is running wildly, this circuit
will stop the operation within 0.1 second. If it was only a hazardous error the microprocessor
will recover and indicate this error. If there is a serious problem on the keyboard processor
board the equipment will most likely do nothing and blank the display after this kind of an
error. Replace the keyboard processor board.
If the generator processor is not working properly the error is indicated by Er 61. In
some cases it might happen that the improperly operating generator processor gener-
ates Er 74 by overloading the keyboard processor. Check by disconnecting generator
processor.
The keyboard processor has a peripheral IC called ASIC (PM 2002IC) which controls input
and output functions of the CPU board. This chip has for some reason lost its configuration
and the microprocessor has detected it. Replace the keyboard processor board.
- If appears more than once, replace keyboard processor board.
There is some non volatile memory for various parameters in the microprocessor chip itself.
The writing of this memory is limited to a minimum of 10 000 times that is in practice 20 years
of equipment life.
However, if this memory did fail, this error is indicated.
- Replace the microprocessor chip or the complete board.
There is some non volatile memory for various parameters in the microprocessor chip itself.
The writing of this memory is limited to a minimum of 10 000 times that is in practice 20 years
of equipment life.
However, if this memory did fail, this error is indicated.
- Replace the microprocessor chip or the complete board.
Chapter C - HELP & ERROR MESSAGES
Planmeca Proline EC X-ray unit C-11