Application Of Silicon Grease To Power Transistor And Diode Bridge; Application Of Silicon Grease To A Power Transistor And A Diode Bridge - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

Application of Silicon Grease to a Power Transistor and a Diode Bridge

6. 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 (PCB) 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 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
instruction.
 Wipe off the old silicon grease completely on a radiation fin.
 Apply the silicon grease evenly to the whole.
 Do not leave any foreign objects, such as solder or paper
 Tighten the screws of the power transistor and the diode bridge, and contact to the radiation fin
<Example>
The shape of electrical box and PCB vary depending on the model.
267
1: Parts number of the silicon grease – 1172698 (Drawing number 3FB03758-1)
Note: There is the possibility of failure with smoke in case of bad heat radiation.
and the radiation fin, and also the diode bridge, and the radiation fin.
without any gap.
Take out a PCB
OK : Evenly applied
silicon grease.
waste,
Power transistor
(TRM, TPM, IGBT, IPM, SPM, etc.)
Diode bridge
(Diode bridge, Rectifier stack, etc.)
Not applied.
NG : Not evenly NG : Foreign object
applied
SiUS12-928_B
between the power transistor
Paper waste
(R9056)
Trial Operation and Field Settings