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ACU Pin Voltage Matrix
Check for proper voltage by completing the following steps:
1. Unplug microwave oven or disconnect power.
2. Connect voltage measurement equipment to the terminals
listed below. (P1-3 and P2-1 are neutral or J21-1 or J2-1 is
neutral.)
NOTE: For 50 V and over, the tolerance is ± 15 V. For 0 V, the tolerance is ± 3 V.
Abbreviations
HL - Hood Light, N - Neutral, CL - Cavity Light, HF - Hood Fan, L - Line Voltage, TT - Turntable Motor, NFS - Neutral for Switch
NOTE: When checking voltage readings on ACU, connect the Negative test lead of voltmeter to connector P1-3 or J21-1 or J2-1. Use
the positive test lead to probe connectors designated below.
Pin Name Wire Color
P1-1 (L)
BLACK
P1-3 (N)
BLUE
P2-1 (N/
BLUE AND
NFS)
GREEN
P2-2
ORANGE
(Door)
P2-3 (N/
WHITE AND
NFS)
BLACK
P4-1 (CL/
BLACK AND
CF)
GREEN
P4-2
RED
(TTM)
P4-4 (FC
BLACK
Valve/
ODM)
P14-1 (L)
BLACK
P14-3
BLACK
(HF-H)
P14-4
WHITE
(HF-L)
P14-5
GREY
(HF-M)
P14-6
BLACK
(HF-ML)
P14-7
RED
For Service Technician Use Only
MW Oven Plugged In—Sitting Idle—ACV Readings
Power
Power On,
Hood Fan
On, Door
Door Open
Motor—
Closed
High
120
120
120
0
0
0
0
0
0
0
120
0
0
120
0
0
120
0
0
0
0
0
0
0
120
120
120
18
20
120
18
22
20
18
25
19
20
23
21
21
24
21
3. Plug in microwave oven or reconnect power, and confirm
voltage reading.
4. Unplug microwave oven or disconnect power.
Hood Fan
Hood Fan
Hood Fan
Motor—
Motor—
Motor—
Med-High
Medium
Low
N/A
120
120
N/A
0
0
N/A
0
0
N/A
0
0
N/A
0
0
N/A
0
0
N/A
0
0
N/A
0
0
N/A
120
120
N/A
19
19
N/A
19
120
N/A
120
20
N/A
68
21
N/A
22
22
Low Profile Microwave Hood Combination
DIAGNOSTICS (Cont.)
MW Oven
Running—
ACV
Readings
Hood
Hood
Microwave
Light—
Light—
Oven Start
High
Low
120
120
120
0
0
0
0
0
0
0
0
38
0
0
0
0
0
120
0
0
120
0
0
0
120
120
120
19
18
20
20
19
22
19
18
23
21
20
24
120
85
23
n
2-7
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