Teledyne M300EM User Manual

13.1.4.3. Relay Board Status LED’s 

There are eight LED’s located on the Relay Board.  The most important of which is D1, which indicates the 
health of the I

2

C bus.  If D1 is blinking the other faults following LED’s can be used in conjunction with DIAG 

menu signal I/O to identify hardware failures of the relays and switches on the relay (see Section 13.1.3  and 
Appendix D).   

D1 

(Red) 

I

2

C bus Health 

(Watch Dog 

Circuit) 

Continuously ON  

or 

Continuously OFF 

Failed/Halted CPU 
Faulty Motherboard, Keyboard or Relay Board 
Faulty Connectors/Wiring between Motherboard, 
Keyboard or Relay Board 
Failed/Faulty +5 VDC Power Supply (PS1) 

 

 

 

 

04288D DCN5752