Repair
332144E 43
Control Panel
Replace Temperature Display
1. See Before Beginning Repair, page 40.
2. Remove screws (21) and display cover (26).
3. Put on static conductive wrist strap.
4. Disconnect main display cable (81) from upper right
corner of temperature display (353). See FIG. 10.
5. Remove jumper (373) from back of display (353).
Set aside and install jumper on new display.
6. Disconnect ribbon cable(s) (R) from back of display;
see FIG. 10.
7. Remove nuts (360) from plate (351).
8. Disassemble display (353), see detail in FIG. 10.
9. Reassemble in reverse order, see FIG. 10. Apply
medium strength thread sealant where shown.
Replace Function Knob/Potentiometer
1. See Before Beginning Repair, page 40.
2. Remove screws (21) and back cover (26).
3. Disconnect potentiometer wires from J5 on motor
control board (354). See FIG. 12, page 46.
4. See FIG. 9. Remove two setscrews (356a) and pull
function knob (356) off potentiometer (357) shaft.
5. Remove nut (N, part of 357) and detent plate (358).
6. Install new potentiometer (357) in reverse order.
Position potentiometer so slot (S) is horizontal.
Position knob (356) so pointer (P) faces up. Install
knob on shaft so slot (S) engages alignment pin in
knob. Push knob onto shaft against detent spring
before tightening setscrews (356a).
7. Reconnect potentiometer wires to J5.
NOTICE
Before handling board, put on a static conductive
wrist strap to protect against static discharge which
can damage board. Follow instructions provided with
wrist strap.
ti21923a
26
21
FIG. 9: Function Knob/Potentiometer
356a
356a
356
357
358
N
P
S
ti21840a
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