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Repair
309518P 17
User Interface
Removing Cover
1. Close main air shutoff valve on air supply line and
on unit.
2. Remove air manifold cover (42). F
IG. 3, page 16.
3. Remove four nuts (32) and open user interface
cover (4). F
IG. 7–FIG. 8.
4. To completely remove cover (4), disconnect ground
wire (315), wires (416 and 406) from main board
(301). See F
IG. 8 and Electrical Schematic, page
28.
Software Upgrades
1. Remove User Interface cover. See above.
2. Use a chip remover (D) to remove software chip (C).
F
IG. 9.
3. Install new chip (beveled corner down).
4. Reassemble.
5. Recalibrate main circuit board. See page 19.
Replacing Main Circuit Board
1. Remove User Interface cover. See above.
2. Disconnect all wire connectors from board (301).
F
IG. 10.
3. Remove four screws (302) and replace board (301).
4. Reassemble. Refer to Electrical Schematic, page
28.
5. Recalibrate main circuit board. See page 19.
F
IG. 7
F
IG. 8
CAUTION
To avoid damaging circuit board, wear a grounding
strap.
32
406
416
315
301
4
F
IG. 9
CAUTION
To avoid damaging circuit board, wear a grounding
strap.
F
IG. 10
C
D
10 987 654 3
10
9
8
7
6
5
4
3
-
+
301
302