Fujitsu S24LDC Service Instruction page 44

Does not operate at all (Operation Lamp and Timer Lamp do not light up)
[Check Point]
(1) Is the input power voltage from the exclusive circuit AC outlet normal?
(2) Is the AC plug inserted to the AC outlet securely and not loose?
(3) Check if each connector is inserted securely.
[Checking Flow Chart]
INDOOR UNIT CONTROLLER PART
Is AC input voltage from AC outlet normal ?
Is AC voltage between VA 1 normal?
Is DC voltage between terminal of C6 normal?
Is DC voltage between terminals of C39 and C19
Is DC voltage between terminal C17 normal?
Is DC voltage between terminals of C42
Is DC voltage between terminals C50 normal?
YES
YES
YES
YES
YES
YES
YES (Pulse wave of DC5Vp-p)
Controller PCB defective
(AC230V)
(AC230V)
(DC325V)
(C39:DC20V)
(C19:DC13.5 1V)
(DC5V)
(DC15V)
07-01
NO
Input power supply failure
NO
Switching power circuit
(F1, VA1 defective)
NO
Switching power circuit
(L1,D6 defective)
NO
Switching power circuit
(IC8, T1 or IC15, IC19 defective)
NO
Switching power circuit
(IC2 defective)
NO
IC20 defective
NO
IC26 Q10 defective