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Repair
309909H 17
Replacing Main Circuit Board
1. Remove User Interface cover. See page 16.
2. Disconnect all wire connectors from board (301).
F
IG. 3.
3. Remove four screws (302) and replace board (301).
4. Reassemble. Refer to Electrical Schematic, page
22.
5. Recalibrate system. See ProMix Easy Operation
Manual.
CAUTION
To avoid damaging circuit board, wear a grounding
strap.
NOTE: If the main control board is replaced on
units that use a flow meter, the flow meter calibra-
tion data must be set using a PC and a Data
Download Kit (Graco P/N 248403 for hazardous
locations or Graco P/N 248404 for non-hazardous
locations).
F
IG. 3
320
301
TI4561a