Point Nix 3d Combi 500 no voltage on the CN14 connector

Another repair the positioning and focusing block of the tomograph Pointnix 3d combi 500.

If the Pointnix 3d combi 500 tomograph does not have AC voltage on the CN14 connector on the circuit board of the positioning and focusing block, you need to do the following.

Check the serviceability of the U5, TL494 chip, with a multimeter at the limit of 2000. Regarding the 7 leg (housing). The microcircuit is on the bottom side of the board in an SMD package.

Check the health of the field MOSFET transistors Q1, Q2 - IRF640. If the transistors are pierced, replace the transistors and snubber C31, C32 with a nominal value of 0.01 ?F with an operating voltage of at least 100V. In the photo, the elements to be checked are highlighted in white.

Tl494. Testing resistance digital tester at the limit of 2000 ohms.

5 - 1020/620
8 - 720/180
9 - 530/540
10 - 530/540
11 - 720/180
12 - 720/180
13 - 1180/566
14 - 1180/566
15 - 1180/599
16 - 0/0

In the photo, the elements to be checked are highlighted in white.

Articles about repairing the dental scanner a Point Nix 3D Combi:

Point Nix 3D Combi - PS1, PS2, PS3, PS4 errors.

Pointnix 3d combi 500 power block repair.

Point Nix 3D - error P5.

Point Nix 3D Combi - soft and hard installation.

Cone-ray tomograph - obtaining 3D images.

Point Nix 3D Combi malfunction definition.