Hitachi RAS-25CNH2 Service Manual page 34

4. Auto Sweep Motor Circuit
Micro computer
Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 4-2 are output from pins
G
k A
– of the micro computer.
Micro computer pins
Horizontal air deflectors
As the micro computer's outputs change as shown in Fig. 4-2, the core of the auto sweep motor is excited
G
to turn the rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.
Horizontal air deflectors
51
4
50
3
49 2
48 1
8
0V
Fig. 4-1 Auto Sweep Motor Circuit (Horizontal air deflectors)
1
51
50
49
48
Fig. 4-2 Micro computer Output Signals
Table 4-1 Auto sweep Motor Rotation
Rotation angle per step (° )
12V
13
14
15
16
IC501
Step width
2 3 4
0.0879
– 37 –
CN4
Auto sweep motor for
horizontal air deflectors
Horizontal air
deflectors: 10ms.
5 6 7
Time per step (ms)
10
Rotor
8