Main Printed Circuit Board (Pcb) Replacement - All Balances; Position Sensor Board - OHAUS PA64 Service Manual

CHAPTER 3 MAINTENANCE PROCEDURES
11. Insert and tighten the two
remaining screws to secure the
Load Cell. Check again that an
Error 8.X is not displayed. If there
is an IDNR error, fix this error first,
and then check that an Error 8.X is
not displayed.
3.3.9 Position Sensor PC Board Removal/Replacement/Adjustment – Precision
12. After completing the adjustment, turn the balance off and remove the Pan and Pan
Support.
Mounting
Screw
13. If a new Position Sensor Board has been installed, see Appendix C and follow the
instructions to restore the EEPROM.
3.3.10 Main Printed Circuit Board (PCB) Replacement – All Balances
If the Display persistently shows Error 1 (invalid checksum data) or 2 (overload or underload
condition), and normal remedies fail to solve the problem, the PCB may need to be replaced.
1. Disconnect the Load Cell Cable, RS232 Cable, and Power Cable.
2. Remove the screws on the Main PC Board which secure it to the Base.
3. Install replacement Main PC Board in the reverse order as removed. Check the LCD
display on the new board and remove the protective plastic covering if in place.
4. Reassemble the balance.
5. Complete the PCB installation using the Pioneer Software Service Tool – see
Appendix C.3, Install New Main Printed Circuit Board.
6. After assembly, verify that the balance meets all specifications. (See Chapter 1.)
Perform all tests. (See Chapter 4.)
Ohaus Corporation www.ohaus.com
Figure 3-35. Position Sensor Board.
3-14
Mounting Screws
Pioneer™ Balances Service Manual