3-20CHAPTER 3 REPAIR PROCEDURES3.2.1 Analytical Balances Main Printed Circuit Board (PCB) (Cont.)CAUTIONWHEN HANDLING THE P.C. BOARD, HANDLE BY EDGES ONLY!DO NOT TOUCH FOIL SIDE OF BOARD. STATIC DISCHARGE MAYDAMAGE SOME COMPONENTS.11. Switch the following components from the defective Main PC Board to the replacement:U5 EEPROMU10 - ICU11 - PSD12. Install the replacement PC Board.13. Connect the two cable connectors from the Analytical Load Cell (9) to the Main PC Board edge connectorsJ3, J6 and the Sensor Cable. The Sensor Board Cable is located at the rear of the balance and may interferewith the operation of the balance if it is not positioned away from the Load Cell. Dress the cables and makesure that the cables do not interfere with the Load Cell. If internal calibration option is installed, connectcable to J4.14. Reinstall the PC Board and secure with two screws (3).15. Install the Hex Screws (14) and Washers (25) at the rear of the balance which secure the connectors onthe PC Board (11).16. Install the Shield (4) back on the balance and secure with two Screws (3) (Figure 5-3).17. Install the Draft Shield and secure with two Screws (2) making sure Lockswitch Cover Seal (1) (Figure 5-2) is in place.18. Replace the Cover Plate (6) and Pan (5) inside of the Draft Shield (Figure 5-2).19. Connect the AC Adapter to an outlet and the Balance. Turn the balance ON.20. Allow the balance to warm up for at least one hour.21. If the balance appears to be functional, refer to paragraph 4.1 and retest the balance.22. If the balance does not appear to function properly and the Main PC Board is being replaced in an effort toisolate the problem, the problem may still be in the Load Cell.
