5-13
Accessory Troubleshooting
TP-5672 11/95
Yes
Yes
Yes
No
Yes
Yes
Disconnect the in-line plug to remove
power from the logic board. Remove
the ribbon cable between P2 on the
power supply board and P3 on the logic
board. Check the ribbon cable for any
open or shorted leads. Are there any
open or shorted leads?
Replace the ribbon cable
between P2 on the power
supply board and P3 on the
logic board.
Replace the logic board.
Replace the power
supply board.
No
No
Yes
No
No
Yes
No
No
Is the normal source
available
Is there a TDEN time delay
set in Index 5 of the
microprocessor program?
Place a jumper between terminals
TB-DC1-4 and TB-DC1-33 on the
power supply board. Does the switch
transfer to the normal source?
Normal source must be
present to bypass the time
delay emergency-to-normal.
Program a TDEN time
delay in index 5 of the
microprocessor program.
Is there continuity between terminal
TB-DC1-4 on the power supply board
and terminal 3 on the bypass switch?
Replace the lead from terminal
TB-DC1-4 on the power supply
board to the bypass switch
Is there continuity between pin P2-4
on the ribbon cable and TB-DC1-4 on
the power supply board?
Is there continuity between
terminal TB-DC1-33 on the
power supply board and
terminal 4 on the test switch?
Replace the bypass switch
Replace the lead from terminal
TB-DC1-33 on the power supply
board to the bypass switch.
Figure 5-14. Troubleshooting—Option DD-08-D, Emergency-to-normal time delay pushbutton does not
work
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