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800961-C
Nov. 2000
区 ALLI NCKRODT
Fault #001
Brake did not turn off
Occurs when: The Brake Status signal, located on the Mother
board, is checked during Power-up testing. Pin 1 of U6 is toggled
low by the CPU causing a low output by U6 pin 3. This signal is
inverted by U15 to cause the Brake Status signal U7 pin 8 to toggle
high. If a problem exists to cause the output to toggle low, the CPU
will display the Fault message at the end of Power-up testing.
Corrective action: Check the Brake Status circuitry of U5, U6, U7
and U15 on the Mother board.
Fault # 002
Brake did not turn on
Occurs when:
The Brake Status signal, located on the Mother
board, is checked during Power-up testing.
Pin 1 and pin 2 of U6
are toggled high by the CPU causing a high output by U6 pin 3.
This signal is inverted by U15 to cause the Brake Status signal U7
pin 8 to toggle low. If a problem exists to cause the output to toggle
high, the CPU will display the Fault message at the end of Power-
up testing.
Corrective action: Check the Brake Status circuitry of U5, U6, U7
and U15 on the Mother board.
Fault # 003
Reverse relay would not turn off
Occurs when: The Reverse Relay control signals, located on the
' Mother board, is checked during Power-up testing. Pin 13 and pin
12 of U6 are toggled low by the CPU, causing the output of U6 pin
11 to go low. This low signal then causes the output of U7 pin 6 to
go high. If a problem exists to cause the output to stay low, the
CPU will display the Fault Message at the end of Power-up testing.
Corrective action: Check chips U6, U15 and U7 on the Mother
board.
Fault # 004
Reverse relay would not turn on
Occurs when: The Reverse Relay control signals, located on the
Mother board, are checked during Power-up testing. Pin 13 and pin
- 12 of UG are toggled high by the CPU, causing the output of U6 pin
11 to go high. This high signal then causes the output of U7 pin 6 to
go low. If a problem exists to cause the output to stay high, the
CPU wili display the Fault Message at the end of Power-up testing.
Corrective action: Check chips U6, U15 and U7 on the
Motherboard.
4-5
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