Troubleshooting
6-26 Manual # 42-02-1P21
MDZLV INPUT FAILURE (CTLB)
Description: The Door Zone/Leveling Monitor (MDZLV) input has detected a failure of the Door
Zone/Leveling (DZLV) or (DZLVA) outputs or failure of the normally open DZ relay.
Troubleshooting:
1. Replace relay DZ.
MGB INPUT FAILURE (CTLA)
Description: A failure of the gate switch bypass circuit has been detected.
Troubleshooting:
1. Toggle the gate bypass switch on the HC-CTL board a few times, then make certain it is fully in
the ON or OFF position.
2. Briefly disconnect then reconnect CAN connection to CTL board to reset processors.
MGBR INPUT FAILURE
Description: A failure of the rear gate switch bypass circuit has been detected.
Troubleshooting:
1. Toggle the gate bypass switch on the HC-CTL-2 board a few times, then make certain it is fully
in the ON or OFF position.
2. Briefly disconnect then reconnect CAN connection to RDR board to reset processors.
MGS INPUT FAILURE (CTLA)
Description: The Gate Switch Monitor (MGS) input has detected a failure of the gate switch or
Door Zone/Door Zone Leveling (DZ/DZLVA) circuitry.
Troubleshooting:
1. Check the condition of the gate switch.
2. If rear doors are present, check GSR.
3. Replace the HC-CTL-2 board.
MGSR INPUT FAILURE (CTLA)
Description: The Rear Gate Switch Monitor (MGSR) input (test point (GSR2) on the HC-CTL-2
board) has detected a failure of the rear gate switch or Door Zone/Door Zone Leveling (DZ/DZLVA)
circuitry.
Condition 1: MGSR should be low during automatic operation when either the rear gate or rear
hoistway doors are open as indicated by the GSR and DLR relays, except during re-leveling.
Troubleshooting:
1. If either relay GSR or DLR is not picked, verify that TP48 is low.
2. If front doors only, GSR and DLABR should be jumpered to the 2 Bus.
Condition 2: If the car is re-leveling, and the front doors are closed, the MGSR input should have
120VAC.
Troubleshooting: Check voltage at MGSR.
Condition 3: This fault is also generated if relays GSR and DLR are picked indicating that the rear
gate and hoistway doors are closed, but the MGSR input is low.
Troubleshooting:
1. Verify that both DLR and GSR LEDs are on.
MHDB INPUT FAILURE (CTLB)
Description: The Hoistway Door Bypass Monitor (MHDB) input has detected a failure of the Hoist-
way Door Bypass (HDB) or (HDBA) outputs.
Troubleshooting:
1. Toggle the door bypass switch on the HC-CTL board a few times, then make certain it is fully in
the ON or OFF position.
2. Briefly disconnect then reconnect CAN connection to CTL board to reset processors.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
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