Hitachi RAC-70YH7 Service Manual page 53

5. Auto Sweep Motor Circuit
Fig. 5-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 5-2 are output from pins
G
– of the micro computer.
15 18
Micro computer pins
Horizontal air deflectors
As the micro computer's outputs change as shown in Fig. 5-2, the core of the auto sweep motor is excited
G
to turn the rotor. Table 5-1 shows the rotation angle of horizontal air deflectors.
Horizontal air deflectors
15
7
16
6
17
5
18
4
8
0V
Fig. 5-1 Auto Sweep Motor Circuit (Horizontal air deflectors only)
1
10
11
12
13
Fig. 5-2 Micro computer Output Signals
Table 5-1 Auto sweep Motor Rotation
Rotation angle per step (° )
12V
CN12/CN11
10
11
12
13
IC501
Step width
2 3 4
0.0879
– 63 –
Auto sweep motor for
horizontal air deflectors
1
2
3
4
5
Horizontal air
deflectors: 10ms.
5 6 7
Time per step (ms)
10
Rotor
8