Chapter Five – Maintenance Procedures – Litter
115
5.7 WEIGH SYSTEM DIAGNOSTICS AND REPAIRS (OPTIONAL EQUIPMENT)
(CONTINUED)
WEIGH CPU BOARD REPLACEMENT
Required Tools:
1/4” Nut Driver Phillips Screwdriver Needle–Nose Pliers
Procedure: (This procedure will take approximately 15 minutes)
1. Unplug the power cord from the wall receptacle.
2. Remove litter access panels 3 and 4 (see page 94).
3. Properly ground yourself (see page 10 for static discharge precautions).
4. Disconnect all cables at the weigh CPU board (see page for board location). Notice the locations of the
cables so they will be reconnected properly to the replacement weigh CPU.
5. To remove the board from the litter standoffs, use needle–nose pliers to squeeze the retention clips and
lift upward on the board.
6. Install the new board and reconnect all cables.
7. Reinstall the two litter access panels and plug the power cord into a properly grounded wall receptacle.
8. The weigh system diagnostic procedure must now be performed (see pages 112 and 113). The functions
to be used are: Init To Defaults, Calibrate Scale and Save.
9. Test weigh system for accurate operation before returning the bed to service.
5.8 LITTER CPU BOARD REPLACEMENT
Required Tools:
Standard Screwdriver 5/16” Nut Driver Needle–Nose Pliers
Procedure: (This procedure will take approximately 20 minutes)
1. Unplug the power cord from the wall receptacle.
2. Remove litter access panels 1 and 2 (see page 93).
3. Properly ground yourself (see page 10 for static discharge precautions).
4. Disconnect all cables at the litter CPU board (see page for board location). Notice the locations of the
cables so they will be reconnected properly to the replacement litter CPU.
5. For easier access to the litter CPU, use a 5/16” nut driver to remove the two screws holding the cable tray
to the litter and lay the tray aside.
6. Using a small screwdriver, remove the two plastic screws from the center area of the board.
7. To remove the board from the litter standoffs, use needle–nose pliers to squeeze the retention clips and
lift upward on the board.
8. Install the new board and reconnect all cables.
9. Reinstall the two litter access panels and plug the power cord into a properly grounded wall receptacle.
10. Test bed operations before returning the bed to service.
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