Check Keyboard cable, connections, and power.
Replace Process and Display Card.
Remove front of keyboard and replace keyboard circuit card.
Keyboard Key Lights Inoperative
Use caution when removing front of keyboard, so as not to damage circuit card and connecting cables.
Disconnect keyboard power before removing front panel.
If all lights are out, remove front of keyboard and check fuse on keyboard card.
If only certain lights are out:
Check bulbs Inside button.
Check connections on back of button Inside keyboard.
Replace keyboard circuit card.
Bar graph displays "Overrange", "Underrange" or "O" when you know the parameter being measured Is not one
of those. Display seems frozen, erratic or Inaccurate.
Check PMS II power supply outputs on MPU Rate Input Module screw terminals or Test Points. If a
voltage(s) Is Incorrect, replace power supply.
2. Enter the Edit mode and determine at which Input Channel the sensor Is terminated.
Check Sensor cable and connections.
Check for system ground fault. Refer to Section VI.
When power supply voltages are correct and no ground fault exists, and the sensor In question Is a
temperature sensor (4 wire RTD type) or a pressure sensor (4 wire 50,100,300,500 or 1000 PSI),
refer to Section VIII to use Sensor Simulator Test box. Replace sensor If simulator displays a correct
reading. Substitute sensor In the event text box Is not applicable. If Improper reading still exists,
proceed to Item 8.
Section 9 - Page 6