Service manual

PN 4237242C
7.4-2
TROUBLESHOOTING
TROUBLESHOOTING ERROR MESSAGES
DRA Board Failure
003 When a stepper motor is set in operation, the DRA card uses a hardware timer
to control the task. When the task is completed, the DRA card generates an
interrupt request signaling that the task is complete. An independent software
timer is allocated whenever a motor is given a task. This timer checks after 30
seconds, and if the interrupt signaling completion of the task has not been
received,
ERROR DETECTED (003) DRA Board Failure
is displayed on the
screen.
Hgb Blank Voltage High
Non-fatal
Error
Two Hgb-blank readings are taken during a sample cycle. If the voltage
received during one of the readings is greater than 4.95 V,
Hgb Blank Voltage
High
is displayed on the screen.
Hgb Blank Voltage Low
Non-fatal
Error
Two Hgb Blank readings are taken during a sample cycle. If the voltage
received during one of the readings is less than 2.5 V,
Hgb Blank Voltage Low
is displayed on the screen.
I nsufficient RAM
006 The system software dynamically allocates and deallocates memory as
required. If an attempt is made to allocate memory for a task and there is not
enough memory available,
ERROR DETECTED (006) Insufficient RAM
is
displayed on the screen.
Keypad Failure
010 This error is currently not used by the system. If software is implemented to
check the hardware on the URA card that controls the keypad input, this is the
error code that would be used to indicate a problem.
This error is not called by the software, but its code is in the list of error
messages used when an error occurs. If the message is displayed on the
screen, program execution has lost its way and the error should be treated as
a
Software Fatal Error.
Power Supply Failure
014 The MD II has an internal DVM function that does a voltage check of the +15
V, +5 V and +12 V power supplies. This function is called during the self-test
portion of power up and just before results are displayed from a sample,
control, calibration, startup or latex cycle. The DVM function is live, that is, it
reports on the power quality at the time the function is called. It would not
report any failure if the power momentarily dropped out earlier in the cycle. If
a failure is returned by the DVM function call,
ERROR DETECTED (014) Power
Supply Failure
is displayed on the screen.
015 The MD II does a voltage check of the +24 V power supply at various times.
As with the DVM check, this function is called during the self-test portion of
power up and just before results are displayed from a sample, control,
calibration, startup or latex cycle. It is also called before reporting an
Hgb-blank error, a vacuum error or any sensor error involving a motor. This
includes the two errors for each syringe, the three horizontal traverse position
errors and the two probe vertical position errors. If there is no +24 V, the
motor does not operate, but the problem is not with the motor or sensor
circuit, so this ensures that a misleading error is not generated.
Table 7.4-1 Error Messages
(Continued)
Error Message Code Description/Possible Fault
C