TP-6745 7/10 41Section 2 Troubleshooting
YES
Power down the
controller and reseat the ribbon
cable between the MLB and the power
board. Repower the controller and
retry transfer. Voltage
at base?
Power down the controller and remove the power board
from the MPAC 1500 case. Check the solder traces to the
K1 relay on the power board.
Faulty transfer coil or rectifier has damaged the
power board. Identify and replace the faulty rectifier,
transfer coil, or wiring. Replace the power board.
NO
Faulty transfer coil or
rectifier. Identify and
replace.
Is there power
to the transfer
coil?
YES
Continued from point
A in Figure 2-21.
A
Are the pin
connections and
leads to the transfer
coil good?
Are the solder
traces open?
Faulty K1 relay, K1
contacts, or power board.
NO
YES
YES
NO
Identify and correct
the bad pin
connections or wiring.
SB-697
Faulty K1 relay.
Replace K1.
and reset faults.
YES
When TDEN times
out, can you hear or see the K1
relay move 3 times before a
fault is issued?
Pull relay K1 from its
base. Check for 12VDC at the
surface-mounted base as you
retry the transfer.
Reinstall K1 relay
and reset faults.
Replace the Main
Logic Board (MLB).
NO
NO
NO
YES
Reset faults.
Transfer?
Return to point A.
Complete.
YES
NO
Figure 2-22 Transfer Troubleshooting, Part 2
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