OHAUS AV114C, Service Manual

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3-6
CHAPTER 3 REPAIR PROCEDURES
3.1.3 Main Printed Circuit Board Replacement (Cont.)
3. The Main Printed Circuit Board is fastened in place by 4 screws located on top of the
board. Remove the screws and the Printed Circuit Board.
4. Install the replacement Printed Circuit board using the 4 screws previously removed.
5. Connect all of the cables back to the replacement board. The connectors are all different and
cannot be connected improperly. Make sure all cables are secured properly.
6. Reassemble the Balance.
7. Replace the batteries if previously removed.
8. Check the performance of the Balance and perform Linearity Calibration In Appendix A.2.
3.1.4 RS232 Interface Printed Circuit Board Replacement (AV Models only)
To replace the RS232 Interface Printed Circuit Board, proceed as follows:
1. Remove the balance cover, refer to section 3.1.1.
CAUTION
WHEN HANDLING THE PRINTED CIRCUIT BOARD,
HANDLE BY EDGES ONLY! DO NOT TOUCH FOIL SIDE
OF BOARD. STATIC DISCHARGE MAY DAMAGE SOME
COMPONENTS.
2. Disconnect the cable from theRS232 Inter-
face printed Circuit Board assembly. See
Figure 3-5.
3. The RS232 Interface Printed Circuit Board
is fastened in place by 2 screws located
on top of the board. Remove the screws and
the Printed Circuit Board.
4. Install the replacement Printed Circuit board
using the 2 screws previously removed.
5. Connect the cable to the replacement board.
6. Reassemble the Balance.
7. Replace the batteries if previously removed.
8. Check the performance of the Balance and
perform Linearity Calibration A.2.
Figure 3-5. Removing RS232 PC Board.