Technical data

Chapter 8: Troubleshooting
8.2.13 Procedure M
If the green PWR LED is “ON,” the yellow SYSTEM TROUBLE LED is “ON,” and D67 GF
LED is “ON,” a ground fault condition exists on the output wiring. A GF trouble condition might
be caused by:
• Appliance wiring touching conduit.
• Improper Installation of an appliance(s).
Perform the following:
1. Disconnect appliances from the strobe (TB12) and speaker (TB4) connection on the
motherboard.
2. Troubleshoot the NAC circuits by checking for a resistance reading other than
infinity between the appliance leads and the conduit.
8.2.14 Procedure N
If the green PWR LED is "ON," the yellow SYSTEM TROUBLE LED is "ON," and D47 INT
TRB is "ON," an Interface Trouble exists. An Interface trouble might be caused by:
• The 30 pin ribbon cable being removed from the display or motherboard
• The 30 pin ribbon cable being connected to the wrong header.
• The 30 pin ribbon cable being damaged.
Perform the following:
1. Ensure that the ribbon cable is properly installed to the user interface and to the
motherboard at J6 (Display Interface).
2. Check to see if the ribbon cable has been damaged in any way. If the ribbon cable is
damaged, replace it.
8.2.15 Procedure O
If the green PWR LED is "ON," the yellow SYSTEM TROUBLE LED is "ON," and D6 EXT AC
WIR is "ON," an open condition exists on the SPB SUP terminals (TB4). This trouble can be
caused by:
• Switch SW2 position 1 is ON despite the SPB SUP terminals not being used.
• UL Listed 10k OHM ½ W EOLR not detected by the SUB SUP terminals.
Perform the following:
1. If AC is being reported separately from the Audio Booster, make sure that a 10k
Ohm ½ W EOLR is properly installed at the Audio Booster and the Audio Booster is
operating properly.
2. If AC is NOT being reported separately, make sure there is nothing on the SPB SUP
terminals (TB4) AND Switch SW2 - position 1 (SPB SUP) is OFF.
SP40S Multi-Function Facility Communication System Manual, Revision D
10