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a. Unplug J62 in main board, measure the resistance via pin 1&2, it should be around 110KΩ @ 25°C indoor temperature. Figure 04-1
b. Power machine off and on, and check if the LED – DS14 in main board in on. If yes, replace the main board. (When chamber heater is working, it’s on or flashing. When heater is not working, it’s off). Figure 04-2