Turret rotation and elevation FET

FET is most easy broken parts in control board, instantly damaged if any short circuit occurred or overstress, it must be handled carefully.

 

Equipment needed

  1. Soldering Iron

  2. Multi-meter

  3. Power supply, optional but recommended, limit Max. current to 2A to prevent further damage during repair work.

Compatible parts

Part No.

Brand

  

Si4562

 Vishay  

SP8M4

 Rohm  

AO4606

 Alpha and  Omega Semiconductor  

 

 

 

 

Chip location

FETs are close to CN9

Chip annotation

Describtion

  

T

 Turret rotation Top side FET  

T'

 Turret rotation Bottom side FET  

E

 Elevation Top side FET  

E'

 Elevation Bottom side FET  

 

 

 

Pin assignment and signal Table

 

 

Pin

Description

 ESC off state A On state B On state

A

 Top side FET

Low side control

 0V 5V 0V

A'

 Bottom side FET

High side control

~ Battery voltage 0V ~ Battery voltage

B

 Bottom side FET

Low side control

0V 0V 5V

B'

 Top side FET

High side control

~ Battery voltage ~ Battery voltage 0V

C

 ESC Top side

Output

 0V 0V ~ Battery voltage

C'

 

ESC Bottom side

Output

 0V ~ Battery voltage 0V

 

Step by Step

  1. Visual check, turn off power, removed all brunt FETs, remove motor from ESC port

  2. Turn on power, put turret ration/elevation stick in center position, ie. in ESC off state,  use multi-meter to measure the voltage of A, A', B, B', C, C' pins, if reading are not the same to the number listed in ESC off state column, it means other parts are damaged, please contact us for after market service.

  3. Move turret ration/elevation stick to one side, measure the voltage of A and B pin,

    • if  A is 5V, B is 0V, then measure A', B' pins, if reading are not the same to the number listed in A On state column, it means other parts are damaged, please contact us for after market service.

    • if  B is 5V, A is 0V, then measure A', B' pins, if reading are not the same to the number listed in B On state column, it means other parts are damaged, please contact us for after market service.

    • if  A  and  B are both 5V, it means other parts are damaged, please contact us for after market service.

  4. Move turret ration/elevation stick to another side, measure the voltage of A and B pin,

    • if  A is 5V, B is 0V, then measure A', B' pins, if reading are not the same to the number listed in A On state column, it means other parts are damaged, please contact us for after market service.

    • if  B is 5V, A is 0V, then measure A', B' pins, if reading are not the same to the number listed in B On state column, it means other parts are damaged, please contact us for after market service.

    • if  A  and  B are both 5V, it means other parts are damaged, please contact us for after market service.

  5. If reading of A, A', B, B' are all correct, solder new FET chip to the board.

  6. Repeat step 3 and 4, now also measure C and C' pin, If reading of A, A', B, B', C,C' are all correct, repair is finished.