Manual 0-2725 4-11 SERVICE TROUBLESHOOTING
6. Place main input power disconnect to OFF.
7. Reconnect wires to the input of the Main Contac-
tor (MC1).
8. Remove the output wires from the Main Contac-
tor.
9. Insulate the ends of the wires with electrical tape
to prevent the ends from contacting each other or
other parts of the Power Supply.
10. Place the main input power disconnect to ON.
• If main input power disconnect fuse(s) blow
the Main Contactor is faulty. Replace Main
Contactor Assembly.
• If main input power disconnect fuse(s) do not
blow, proceed to step 11.
11. Place main input power disconnect to OFF.
12. Reconnect wires to the output of the Main Con-
tactor (MC1).
13. Remove wire #10 from the (+) and wire #7 from
the (-) terminals from the Input PC Board.
14. Insulate the ends of the wires with electrical tape
to prevent the ends from contacting each other or
other parts of the Power Supply.
15. Place the main input power disconnect to ON.
• If main input power disconnect fuse(s) blow
the Input PC Board is faulty. Replace Input
PC Board Assembly.
• If main input power disconnect fuse(s) do not
blow, then one or both of the FET/Heatsink
Assemblies is faulty. Check each assembly per
Section 4.09-J.
E. Input PC Board Test
Locate the Input PC Board behind the EMC Filter As-
sembly and check for shorted input diode.
R2
G
(+) (-)
AC1
AC2
AC3
A-01402
Input PC Board
Remove AC power and with an ohmmeter set on the di-
ode range make the following checks:
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