5-62 Accessory Troubleshooting
TP-5672 11/95
No No
Yes
Yes
Yes
Yes
Yes
No
No
No
Remove the leads from terminals TB-DC1-20 and
TB-DC1-34 of the power supply board from the
auto/manual switch. Is there continuity between
terminal TB-DC1-20 of the power supply board
and terminal 3 of the auto/manual switch?
Disconnect the in-line plug. Remove the
ribbon cable between plug P2 of the power
supply board and plug P3 on the logic
board. Check the ribbon cable for any
opens or shorts. Is there an open or short?
Replace the lead from terminal
TB-DC1-20 and TB-DC1-34 of
the power supply board to the
auto/manual switch.
Replace the ribbon cable between
plug P2 of the power supply board
and plug P3 on the logic board.
Remove the leads TB-DC1-20 and
TB-DC1-34 from TB-DC1 terminal strip.
Is there continuity between leads that
were connected to terminals TB-DC1-20
TB-DC1-34 of the power supply board?
Replace the
auto/manual switch.
Replace the lead from terminal
TB-DC1-34 of the power supply board
to the auto/manual switch.
Is there continuity between pin
P2-24 and terminal TB-DC1-20
of the power supply board?
Replace the power
supply board.
Replace the
logic board.
No
Place the auto/manual switch
in the AUTO position.
Yes
Is the auto/manual switch
in the AUTO position?
Is there continuity between terminals
TB-DC1-20 and TB-DC1-34 of the
power supply board?
Figure 5-69. Troubleshooting—Option DD-29-U, -V, -W, and -X, Auto/Manual switch does not work in the
auto position
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