Hitachi RAC-70YH7, Service Manual

Page: 53 / 92

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5. Auto Sweep Motor Circuit
18
17
16
15 7
6
5
4
8
10
IC501
12V
CN12/CN11
Auto sweep motor for
horizontal air deflectors
Rotor
0V
11
12
13
1
2
3
4
5
Fig. 5-1 Auto Sweep Motor Circuit (Horizontal air deflectors only)
●
Fig. 5-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 5-2 are output from pins
– of the micro computer.
Micro computer pins
Step width
Horizontal air
deflectors: 10ms.
1 2 3 4 5 6 7 8
Horizontal air deflectors
10
11
12
13
Fig. 5-2 Micro computer Output Signals
●
As the micro computer’s outputs change as shown in Fig. 5-2, the core of the auto sweep motor is excited
to turn the rotor. Table 5-1 shows the rotation angle of horizontal air deflectors.
Rotation angle per step (
°
)
0.0879
Time per step (ms)
10 Horizontal air deflectors
Table 5-1 Auto sweep Motor Rotation
15 18