Troubleshooting
5-18 Manual # 42-02-2P24
MABB INPUT FAILURE
Description: The Bottom Access Bypass Monitor (door close contacts) (MBAB) input monitors operation of
the solid state devices associated with bypassing bottom hoistway door contacts during access operation.
Troubleshooting: Remove the car from access operation and verify that test point TP41 (MBAB) on the
HC-CTL board is low with respect to 1 bus.
MABBR INPUT FAILURE
Description: Bottom Rear Access Monitor (door close contacts) (MABBR) input monitors operation of the
solid state devices associated with bypassing bottom rear hoistway door contacts during access operation.
Troubleshooting: Remove the car from access operation and verify that test point TP43 (MABBR) on the
HC-RDR board is low with respect to 1 bus.
MABGF INPUT FAILURE
Description: The Front Access Gate Bypass Monitor (MABGF) input has detected a failure of the Access
Bypass Gate A (ABGA) or Front Access Bypass Bottom (FABB) outputs.
Troubleshooting:
1. Temporarily disconnect then reconnect CAN connection to HC-CTL board to reset microprocessors.
2. Verify that SPA, SPB, and SPC LEDs are all lighted.
3. If this failure occurred while updating software, refer to the update instructions and repeat the process.
MABGR INPUT FAILURE
Description: The Rear Access Gate Bypass Monitor (MABGR) input has detected a failure of the Rear
Access Bypass Gate A (ABGAR) or Rear Access Bypass (RABA) outputs.
Troubleshooting:
1. Temporarily disconnect then reconnect the CAN connection to the HC-RDR board to reset the micropro-
cessors.
2. Verify that SPA and SPB LEDs are lighted.
3. If this failure occurred while updating software, refer to the update instructions and repeat the process.
MABT INPUT FAILURE
Description: The Top Access Bypass Monitor (door close contacts) (MABT) input monitors operation of the
solid state devices associated with bypassing the top hoistway door contacts during access operation.
Troubleshooting: Remove the car from access operation and verify that test point TP33 (MABT) on the
HC-CTL board is low with respect to 1 bus.
MABTR INPUT FAILURE
Description: The Top Rear Access Bypass Monitor (MABTR) input monitors proper operation of the solid
state devices associated with bypassing the top rear hoistway door contacts during access operation.
Troubleshooting: Remove the car from access operation and verify that test point TP42 (MABTR) on the
HC-RDR board is low with respect to 1 bus.
MACHINE ROOM INSPECTION
Description: The controller is in MACHINE ROOM inspection operation.
MBAB INPUT FAILURE
Description: The Bottom Access Bypass Monitor (door lock contacts) (MBAB) input has detected a failure
of the Bottom Access Bypass (BAB) or (BABA) outputs or the BAB input.
Troubleshooting:
1. Check wiring at HC-CTL board terminal BAB.
MBABR INPUT FAILURE
Description: The Bottom Rear Access Bypass monitor (door lock contacts) (MBABR) input has detected a
failure of the Bottom Rear Access Bypass (BABR) or (BABAR) outputs or the BABR input.
Troubleshooting:
1. Check wiring at HC-RDR board terminal BABR.
2. Check Access switches and proper wiring of access terminals (ABU, ABD).
Table 5.1 Status and Error Messages
Scrolling Message - Special Event Message
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