Hitachi Summit RAC-18YH6, Service Manual, Page: 34 / 96

– 32 –
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
Table 4-1 Auto sweep Motor Rotation
Microcomputer
18
17
16
15
11
10
12
6
7
5
13 4
IC711
12V
CN4
Rotor
Auto sweep motor for
horizontal air defectors
Fig.4-1
Rotation angle per step ) Time per step (ms.)
0.0882 10 Horizontal air deflectors
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 E
E E E
~ H H
H H 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.