Inverter Pcb - Fujitsu Airstage J-II Service Manual

SERVICE PARTS INFORMATION 4

Inverter PCB

Filter PCB
Check Filter PCB -1
(1) Using a tester, measure the resistance value of both ends of the fuses (P501). (*Cannot be checked visually.)
Is Fuse (45A/500V) open?
YES
Check Filter PCB -2
PCB pattern and parts on PCB defective?
NO
Check Filter PCB -3
(2) Replace blown fuse.
(3) Disconnect all the connection wires between the Filter PCB - Inverter PCB.
(4) Is there a short between L- N?
NO
Check Inverter PCB -1
(5) Is there a open between the two ends of the resistance R385 or R386?
(6) Is there a short between wire :W380 and terminal TM394.
NO
Check Inverter PCB -2
(7) Is there a open between each terminals of Diode D380 or D381.
NO
Electric parts check
Are the following parts defective?
ACTPM
Choke Coil
NO
Check Inverter PCB -3
(8) Disconnect the connection wires (2) between the Inverter PCB and ACTPM
(9) Is there a short between the wires of step (8)?
NO
Check Inverter PCB -4
(10) Disconnect the connection wires (8-pin connector)
between the Inverter PCB - Main PCB.
(11) Is there a short between Inverter PCB side connector pins 1-2 and 2-3?
NO
Check Inverter PCB -5
(12) Disconnect the connection wires (3-pin connector)
between the Inverter PCB - Filter PCB.
(13) Is there a short between Inverter PCB side connector
pins 1-3 and Filter PCB side connector pins 1-3?
NO
Turn on the power.
(14) Reconnect all the connection wires disconnected up to (1)-(13) to their original places.
(15) Turn on the AC power.
If the LED of the Inverter PCB does not light or blink, replaces the Inverter PCB-Filter PCB.
YES
Replace Filter PCB
YES
YES
Replace Inverter PCB
YES
Replace Inverter PCB
YES
Replace defective electric
parts.
YES
Replace Inverter PCB
YES
Replace Inverter PCB
YES
Inverter PCB side short circuit
Replace Inverter PCB
Filter PCB side short circuit
Replace Filter PCB
04-87
NO
Replace Filter PCB