Mitsubishi FDT71VH - Page 72

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71
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'20 • PAC-SM-351
(ii) Models FDC100VSX-W, 125VSX-W, 140VSX-W
1) Replace the PCB
after elapsing 3 minutes from power OFF.
(
Be sure to measure voltage (DC)
on both capacitor terminals located in control back, and
check that
the voltage is discharged sufciently.
(Refer to Fig.1))
2) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor
thenremovethePCB.Wipeoffthesilicongreaseneatlyonthecontrol’sradiationheatns.
3) Match the setting switches (JSW10,11) of new PCB with the former PCB.
4) BeforeinstallingthepowertransistoronthenewPCB,applyuniformlyabundledofsilicongreaserstonthe
surface of power transistor.Make sure it is applied to prevent damage on power transistor.
5) TightenthescrewofpowertransistoroninverterPCBandconnecttheterminalblock.Conrmtheconnection
and don’t use soldering in the connection.Tighten properly the power transistor with a screw and make sure
there is no slack.Power transistor can be damage if not properly tighten.(Recommended power transistor
tighteningtorque:0.98–1.47N∙m)
Parts No.
Parts arrangement view
Fig.1 Position of capacitor
TB5
TB6
CNI2
CNR
TB7
TB8
TB9
Voltage measurement parts
JSW11
JSW10
CNW2
CNO1
CNW1
-1 OFF -1 ON
-2 OFF -2 OFF
-3 OFF -3 ON
JSW10
-4 OFF
JSW11
-4 ON
Table. 1 Switch setting
Models FDC100VSX-W, 125VSX-W, 140VSX-W
-1 OFF -1 OFF
-2 -2 OFF
-3 OFF -3
JSW10
-4 OFF
JSW11
-4
Models FDC100VSA, 125VSA, 140VSA
ON
OFF
ON
PCA012D025F
P
LED