The Computer
5-88 Manual # 42-02-1P28 A3
MDLR INPUT FAILURE (505) Description: The Monitor Rear Door Lock (DLR) input has detected a fail-
ure of the Rear Hoistway Door Bypass (HDBBR) or Rear Bottom Access
Bypass (BABBR) outputs, Rear Gate Switch (GSR), Rear Door Position Mon-
itor (DPMR), or Rear Door Lock Access Bypass (DLABR) inputs.
Troubleshooting:
Check voltage on HC-CTL-2 board terminal DLABR. DPMR should activate
two inches before DLABR.
If DLR is active, GSR must also be active.
MDRE FAILED TO TURN OFF (309) Description: MDRE monitors the solid state starter DRE device. The device
did not open when expected. Cannot be bypassed.
Troubleshooting:
Check the associated wiring.
Verify the DRE system output.
Contact MCE; possible defective HC-MPU-2-TS board.
MDRE FAILED TO TURN ON (310) Description: MDRE monitors the solid state starter DRE device. The device
did not close when expected. Fault-bypassed in Construction/Inspection.
Troubleshooting:
Check the associated wiring.
Verify the DRE system output.
Contact MCE; possible defective HC-MPU-2-TS board.
MDSE FAIL TO ACT (593) Description: The MDSE input monitors the status of the DSE triac and the
DSE triac driver. When either one fails to activate when expected this fault
is generated. When the doors are locked, the 2L bus is high, the down nor-
mal limit (DNTD) is closed and the car is idle, terminals DS and DSE should
120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down slow valve coil.
3. Run the car down on inspection and verify that terminal DSE goes low.
4. The DSE triac may have failed open. Replace the HC-DVR board.
MDSE FAIL TO DEACT (596) Description: The MDSE input monitors the status of the DSE triac and the
DSE triac driver. When either one fails to deactivate when expected this
fault is generated. When the doors are locked, the 2L bus is high, the down
normal limit (DNTD) is closed and the car is idle, terminals DS and DSE
should 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down slow valve coil.
3. The DSE triac may have shorted. Replace the HC-DVR board.
MDZLV INPUT FAILURE (472) 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.
2. Replace the HC-CTL-2 board.
If the fault only occurs in the up direction it could be caused by an overlap
of the LU and DZ sensor (hydro).
If the fault only happens at a door zone after restoring a stop switch, then
MDZLV is not going low when the stop switch is open. See if voltage is pres-
ent at CTL terminal DLAB. If it is trace back to see why. DLAB should be
powered by 2S and 2S should be low if a safety is open.
The fault will also occur if MDZLV is high when DZ is low.
Table 5.10 Touch Screen Event Listings
Event Description
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