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TROUBLESHOOTING GUIDE (con’t)
PROBLEM POSSIBLE CAUSE CORRECTION
4. No Power from 4. Check E15 to ground (See
Control Board page 14).
I. Control Panel
1. Control Panel Ribbon 1. Check control panel ribbon
Keys Inoperative or Cable Plugged in cable (silver area on the ribbon
Malfunctioning
Wrong cable terminal should be
facing away from the control
board). Plug in correctly if
Incorrect.
2. Control Panel or Ribbon 2. Check E2 test points page 14.
Cable Defective (Or)
No Signal Read at
Control Board.
J. LED’s Do Not
1. Unit Switched Off 1. Press unit On/Off key
Illuminate.
2. LED Ribbon Cable 2. Check LED ribbon cable. Plug
Plugged in Wrong. in correctly if incorrect.
3. No Data from Control 3. Replace control board.
Board.
K. All LED’s Stay
1. Bad Data from Control 1. Replace control board.
Illuminated. Board.
L. Same Segment(s)
1. Bad Data from Control 1. Replace control board.
Missing From All Board.
Display Windows
M. Segment(s) Miss-
1. Bad LED Board in 1. Replace control panel assembly.
Ing From Only one Control Panel.
Display Window.
N. Door or Unit
1. See Page 12 this Manual 1. See page 12 this manual.
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