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800961-C
Nov. 2000
区 JALLINCKRODT
Fault # 011
PWM
D/A conflicts with A/D (5V)
Occurs when: During Power-up testing, the CPU outputs +5V on
the D/A, U18 pin 3 located on the CPU board. The output value is
read by the A/D, U16 pin 1 on the CPU board. Any discrepancy
between the two values will cause the CPU to display the Fault
message at the end of Power-up testing.
Corrective action: Check chips U16 and U18 on the CPU board
and U8 on the Mother board.
Fault # 012
PWM D/A conflicts with A/D (2.5V)
Occurs when: During Power-up testing, the CPU outputs +2.5V on
the D/A, U18 pin 3 located on the CPU board. The output value is
read by the A/D, U16 pin 1 on the CPU board. Any discrepancy
between the two values will cause the CPU to display the Fault
message at the end of Power-up testing.
Corrective action: Check chips U16 and U18 on the CPU board
and U8 on the Mother board.
Fault #013
PWM D/A conflicts with A/D (0V)
Occurs when:
During Power-up testing, the CPU outputs OV on the
D/A, U18 pin 3 located on the CPU board. The output value is read
by the A/D, U16 pin 1 on the CPU board. Any discrepancy between
the two values will cause the CPU to display the Fault message at
the end of Power-up testing.
Corrective action: Check chips U16 and U18 on the CPU board
and U8 on the Mother board.
Fault # 014
PWM stop would not turn off
Occurs when: During Power-up testing, the PWM STP STATUS
line, U5 pin 3, is checked to ensure that the DEAD STOP line, U6
pin 1, can enable the PWM controller. U6 pin 1 is toggled high,
causing U5 pin 2 to be high. The failsafe is toggled, causing U5 pin
2 to be high. If the output of US pin 3 is high, the CPU will display
the Fault message at the end of Power-up testing.
Corrective action: Check U5, U6, U14, and U16 on the Mother
board.
4-7
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