Emerson LC320EM1 Service Manual page 66

Inverter CBA, Function CBA, IR Sensor CBA & Junction CBA Top View
Because a hot chassis ground is present in the power supply
circuit, an isolation transformer must be used when repairing.
Also, in order to have the ability to increase the input slowly,
when troubleshooting this type of power supply circuit,
a variable isolation transformer is required.
Function CBA
Inverter CBA
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
Not Used
10-24
Junction CBA
IR Sensor CBA Not Used
BA01F4F01031