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Repair
18 309909H
Replacing Display Circuit Board
1. Remove User Interface cover. See page 16.
2. Disconnect wires from display board (410). F
IG. 4.
3. Remove two screws (411).
4. Loosen setscrew (419) from knob (405) and remove
knob assembly. Remove jam nut (N).
5. Remove and replace display board (410).
6. Reassemble. Refer to Electrical Schematic, page
22.
CAUTION
To avoid damaging circuit board, wear a grounding
strap.
FIG. 4
416
406
416
403
407
410
404
411
419
405
403
406
407
413 418
401
TI4755a TI4756a
N