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Check Si04-402A110 Service Diagnosis5.1.10 Power Transistor CheckCheck No.13Note: Check to make sure that the voltage between the terminal of Power transistor (+) and (-) isapprox. 0 volt before checking power transistor.< Measuring method >Disconnect the compressor harness connector from the outdoor unit PCB. To disengage theconnector, press the protrusion on the connector.Then, follow the procedure below to measure resistance between power transistor (+) and (-)and the U, V and W terminals of the compressor connector with a multi-tester. Evaluate themeasurement results for a pass/fail judgment.5.1.11 Turning Speed Pulse Input on the Outdoor Unit PCB CheckCheck No.15 Make sure the voltage of 270±30V is being applied.(1) Stop the operation first and then the power off, and disconnect the connector S70.(2) Make sure there is about DC 270 V between pins 4 and 7.(3) With the system and the power still off, reconnect the connector S70.(4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice atpins 1 and 4.If the fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too.If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB.If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fanmotor.If there are both the voltage (2) and the pulse (4), replace the PCB.∗ Propeller fan motor : S70Negative (-) terminal oftester (positive terminal(+) for digital tester)Power transistor(+)UVW Power transistor(-)UVWPositive (+) terminal oftester (negative terminal(-) for digital tester)UVW Power transistor(+) UVW Power transistor(-)Normal resistance Several kΩ to several MΩ (∗)Unacceptable resistance Short (0 Ω) or open7654321 DC270VS70PCBTurning speed pulse input (0-15 V)15V(R2859)
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