Hitachi RAC-14EH2, Service Manual, Page: 34 / 95

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4. Auto Sweep Motor Circuit
Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pin E ~ H of
microcomputer.
As the microcomputer’s outputs change as shown in Fig.4-2, the coils of the auto sweep motor is excite to turn the
rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.
Microcomputer
18
17
16
15
11
10
12
6
7
5
13
4
IC711
12V
CN4
Rotor
Auto sweep motor for
horizontal air defectors
Micro computer pins
Step width : 10ms
Horizontal air deflectors
15
16
17
18
1 2 3 4 5 6 7 8
Fig.4-2 Microcomputer Output Signals
Fig.4-1
Table 4-1 Auto sweep Motor Rotation
Rotation angle per step ( ) Time per step (ms.)
0.0882 10 Horizontal air deflectors