KitchenAid KHMS105E Service Manual page 63

Microwave Oven Hood Combo Service Manual — LIT 4317216
COMPONENT
Switches (with wire leads re-
moved). All of the switches are
measured in the same manner.
N.C. CONTACTS
C.
N.O. CONTACTS
Temperature Probe
Fan Motor (with leads discon-
nected).
Blower Motor (with leads dis-
connected)
Synchronous Motor (with leads
disconnected)
TEST PROCEDURE
N.O. and C Terminals
Set the ohmmeter to the R x 1
scale, and measure the resistance
between the normally-open (N.O.)
and the common (C) terminals of
the switch.
N.C. and C Terminals
Set the ohmmeter to the R x 1
scale, and measure the resistance
b e t w e e n t h e n o r m a l l y - c l o s e d
(N.C.) and the common (C) termi-
nals of the switch.
Set the ohmmeter to the R x 10 k
scale, and measure the tempera-
ture probe with the leads posi-
tioned at either terminal.
Set the ohmmeter to the R x 1
scale, and measure across the
terminals.
Set the ohmmeter to the R x 1
scale, and measure the:
a) High speed windings (blue
and black wires).
b) Low speed windings (blue
and white wires).
Set the ohmmeter to the R x 1000
scale, and measure the resistance
between the motor terminals.
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Original 03/97
Page 3-21
RESULT
a) Normal - The meter indi-
cates infinity.
b) Abnormal - The meter
indicates zero ohms (a
short).
a) Normal - The meter indi-
cates continuity, or zero
ohms.
b) Abnormal - The meter
indicates infinity.
Ambient Resistance
Temp. (˚F) Value
60 75.24 kΩ (±11 kΩ)
68 62.57 kΩ (±8 kΩ)
70 59.79 kΩ (±8 kΩ)
80 45.80 kΩ (±7 kΩ)
90 36.94 kΩ (±6 kΩ)
a) Fan Motor - Normal = 30
to 45 ohms.
a) Normal - High speed: 25
to 45 ohms.
b) Normal - Low speed: 45
to 65 ohms.
a) Normal - 3 k to 4 k ohms.
b) Abnormal - Infinite or
zero ohms.