Troubleshooting
5-2 Manual # 42-02-2P24
Status and Error Messages
In Diagnostic Mode, the top line of the LCD displays eleva-
tor status. The message scrolls if it is too long to be displayed
all at once. There are status messages for operating modes
(e.g., FIRE SERVICE PHASE 1 - MAIN) and for error condi-
tions (e.g., SAFETY CIRCUIT IS OPEN).
The following table contains some terms that are unique to
MCE or to electronics manufacturing:
• 2 or 2xx Bus: These are 120VAC buses originating in the controller.
• IDC: Insulated Displacement Connectors. These are connectors that allow an insulated
wire to be pressed into place where narrow “jaws” cut the insulation to provide positive
connection. When an instruction says to “check IDC,” it means to check signal presence at
that connector/number, the integrity of the wire, the source connection, and the source
signal.
• NYCHA: New York City Housing Authority.
• Data Trap: An electronic “capture” of the present status, off or on (0 or 1) of eight signals.
Used when troubleshooting to see that signals are in the expected state during a particular
point of controller operation.
• Jumper: A board-mounted connector with exposed, vertical pins that can be shorted
together using a small “jumper” designed to slide on to two pins.
• PMT: Panel Mount Terminal. Gray screw-terminals arranged on a length of DIN rail.
PMTs provide a convenient point of connection for field wiring.
Header connector
on circuit board
Jumper
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