This station is discontinued and may no longer be supported. These instructions are provided to assist with operation and maintenance, and to guide upgrade paths.

Summary

The four LEDs on the front of the JK-1MD/MED or JK-1HD blink right to left and then back, from left to right, in a rotating pattern.

Cause

This indicates a short between the A1-A2 (door station input/output), or the B1-B2 (sub-station input/output) wiring.

Solution

Check for loose, disconnected, or incorrectly polarized wires. A bench test can also prove this by providing a short run of fresh wire, in a controlled environment, between each piece of equipment.

The LEDs in question are located in the highlighted area of the master station, found below.