TROUBLESHOOTING
D SERIES CONTROLLER
TROUBLESHOOTING AND COMPONENT REPLACEMENT
1-8 August 9, 2005
Kaaaw sk
1.2.1.2 TEACH PENDANT IS INOPERABLE
The teach pendant is in operable with the controller main disconnect set to ON and the
control power lamp is illuminated.
Failure 1: The control power lamp is illuminated and the teach pendant is inoperable
(the back light is not illuminated).
DC power is supplied to the controller, but power is not supplied to the teach pendant to
illuminate the display or back light.
Main causes include:
1. +12 VDC is not supplied to the teach pendant.
2. Defective LCD panel, circuit board, or other internal teach pendant components.
3. Disconnected or short-circuited teach pendant cable.
Ensure the teach pendant cable is properly connected to the controller.
Replace the teach pendant.
Replace the teach pendant cable.
Failure 2: The back light is illuminated, but the screen is not displayed.
When the teach pendant back light is illuminated this indicates power is supplied to the
teach pendant. If the teach pendant is operating normally the initial screen is displayed
regardless of the 1KA board condition.
Main causes include:
1. Defective LCD panel, circuit board, or other internal teach pendant components.
Replace the teach pendant.
Failure 3: The teach pendant screen is displayed and the back light is illuminated, but
key input and AS Language commands are not possible.
This condition occurs when key input and AS Language commands do not reach the
1KA board or data from the 1KA board does not reach the teach pendant.
Data is transmitted between the 1KA board and the teach pendant as shown in figure 1-
3.