Initial Troubleshooting; Checking Electrical Wiring And Power Supply - York IDM030B21E Series Service Manual

TROUBLESHOOTING
3.1

Initial Troubleshooting

3.1.1 Checking Electrical Wiring and Power Supply

Check the following items for any abnormalities in the activation of the system.
No. Check Situation
1 Is any power supply breaker or
fuse open?
2 Is the voltage at the secondary
side of the transformer correct?
3 Is the wiring firmly secured and
correctly connected?
NOTE:
If the fuse(s) on an I.U. PCB is blown, diagnose the cause of overcurrent and replace the fuse(s).
In addition, check the power supply of optional parts because the fuse may blow out by the power supply
failure. Turn off power for safety.
3-2
Check the voltage (secondary side) of the breaker and also
check the continuity of the fuse with a tester.
Disconnect at the secondary side of the transformer and measure
voltage with a tester.
Check that the following wiring connections on O.U./I.U. printed circuit
boards (PCBs) are not loose.
• The connection for thermistors
• The connection for the wired controller cable
• The connection for communication cabling
• Each connection for power supply line
Check that the wiring connection on O.U./I.U. PCBs are not loose or
misconnected on the site according to the "Electrical Wiring Diagram" of
the Engineering Manual.
Check Method
SM-16005-rev.2