QAL Medical 480, Service And Technical Manual

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pulses therefore the speed measured=0 even though the motor is revolving.
Corrective Action: Troubleshoot PCB. MC33039 OSC Resistor-Capacitor combination may be out
of tolerance.
There can be excessive noise on the Hall effect sensor inputs, a bad MC33039, a bad microcontroller,
etc. Reset EE_ERROR byte by entering the calibration routine.
[E6]: EEPROM INITIALIZATION ERROR
Error action: This error prevents the CPM from entering the run mode.
Display: EEPROM ERR [E6]
Cause: During initial calibration certain variables in EEPROM are initialized. If there is some problem and
one of these variables cannot be written to EEPROM, error 6 is generated.
Corrective Action: If the problem recurs replace the microcontroller or the PCB.
[E7]: CYCLE COUNTER ERROR
Error Action: This error causes the microcontroller to burn 7 in the EE_ERROR EEPROM.
Display: *****STOP*****
Cause: Every time the unit pauses in extension a variable in the software called cycles since save
is incremented. Every six minutes of operation the timer is incremented and the total cycle count is
increased by the cycles since save, after which cycles since save is zeroed. If this process goes awry
and cycles since save becomes greater than 500 error 7 is generated.
Corrective Action: Contact the Technical Service Department and inform them of the error. The main
PCB may need to be replaced.
[E8]: MOTOR SPEED ERROR
Error Action: This error causes the microcontroller to burn 8 in the EE_ERROR EEPROM and causes the
CPM to stop.
Display: *****STOP*****
Cause: The maximum CPM rpms is less than 200. If the speed measured is greater than 254 counts in
one timer overflow (roughly 500 rpm) then error 8 is generated.
Corrective Action: Troubleshoot PCB. MC33039 OSC Resistor-Capacitor combination may be out
of tolerance. There can be excessive noise on the Hall effect sensor inputs, a bad MC33039, a bad
microcontroller, etc. Reset EE_ERROR byte by entering the calibration routine.
[E9]: START/STOP ERROR
Error Action: This error causes the microcontroller to burn 9 in the EE_ERROR EEPROM and causes the
CPM to stop.
Display: *****WAIT*****
Cause: The microcontroller has detected that the START/STOP key was depressed for more than 16.4
seconds. The START/STOP on the main or auxiliary controller may have been depressed for that period.
The PCC (Patient Control Cord) may have an open circuit. The main controller may have a short circuit.
It is normally open.
Corrective Action: Troubleshoot the controller and the main PCB. Reset EE_ERROR byte by entering the
calibration routine.
[E10]: KNEEPOT WIPER VOLTAGE TOO LOW
Error Action: This error causes the microcontroller to burn 10 in the EE_ERROR EEPROM and causes
the CPM to stop.
Display: ANGLE ERROR [E10]
Cause: The kneepot wiper or +8v may have an open. The main PCB may have a problem.
Corrective Action: Examine the kneepot, the kneepot cable and kneepot connector for possible opens