Application Of Silicon Grease To A Power Transistor And A Diode Bridge - Daikin CTXS09GVJU Service Manual

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1.3 Application of Silicon Grease to a Power Transistor and a
Diode Bridge
Applicable
All outdoor units using inverter type compressor for room air conditioner.
Models
When the printed circuit board of an outdoor unit is replaced, it is required that silicon grease (*1) is
certainly applied to the heat radiation part (the contact point to the heat radiation fin) of the power
transistor and diode bridge.
Details The silicon grease is an essential article for encouraging the heat radiation of the power transistor
and the diode bridge. Applying the paste should be implemented in accordance with the following
instructions.
Caution: If there is improper heat radiation, smoke may result and cause failure of application. T
<Example>
Take out a PCB
230
*1: Part number of the silicon grease – 1172698 (Drawing number 3FB03758-1)
To completely wipe off the old silicon grease on a heat radiation fin.
To evenly apply the silicon grease to the whole.
Do not have any foreign objects such as solder or paper waste between the power transistor,
the diode bridge, and the heat radiation fin.
To firmly tighten the screws of the power transistor and the diode bridge, and to surely contact
to the heat radiation fin without any gap.
OK : Evenly applied
silicon grease.
Diode bridge
(Diode bridge, Rectifier stack, etc.)
Power transistor
(TRM, TPM, IGBT, IPM, SPM, etc.)
Not applied.
NG : Not evenly NG : Foreign object.
applied
SiUS12-814
Paper wastage
(R7100)
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