JADEVER
JCE/JWE
Service Manual - V05
As per the right of proprietary intellectual property, may not be reproduced in any form without written permission.
21
CHAPTER 3 MAINTENANCE
3-1 Replacing the main printed circuit board
Note
！
:
To proceed cautiously & carefully
Any intention to replace PCB and/or to repair components
on the board must proceed cautiously and carefully;
otherwise further irreversible damage(s) may be caused
.
1. Refer to the three figures below.
2. Switch off the scale.
3. Remove the stainless steel weighing pan.
4. Loosen the four fixing screws and remove the plastic pan support.
5. Loosen and remove seven fixing screws at the bottom.
6. Move up carefully the upper cover. Pay attention that several wires are connected to the
main PCB mounted on the upper cover. Place the upper cover upside down for better
handling during working.
7. Use soldering iron to remove the load cell wires from the main board at CN1 (E+, E-, S+,
and S- marked) on the main board.
8. Remove all connectors from the main board.
9. Use soldering iron to remove buzzer wires at BZ1 on the main board.
10. Loosen and remove two fixing screws of the main board.
11. Take out the main board.
12. Prepare and install a new main board, following reversibly of the steps 6~8 to install back
connectors and wires.
13. Install the upper cover back.
14. Install the seven fixing screws at the bottom.
15. Install and fix the pan support and the weighing pan.
16. Switch
on the scale and check functions.
