Auto Sweep Motor Circuit - Hitachi RAK-25NH4 Service Manual

4. Auto Sweep Motor Circuit

Microcomputer
Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pins
– of microcomputer.
15 18
Microcomputer pins
Horizontal air deflectors
As the microcomputer's outputs change as shown in Fig.4-2, the core of the auto sweep motor is excited
to turn the rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.
Table 4-1 Auto sweep Motor Rotation
Horizontal air deflectors
IC711
9
18
7
6
17
5
16
15 4
8
1
15
16
17
18
Fig.4-2 Microcomputer Output Signals
Rotation angle per step (˚ )
12V
10
11
12
13
0V
Fig.4-1
Step width
2 3 4
0.0882
– 64 –
Auto sweep motor for
horizontal air defectors
Rotor
Horizontal air
deflectors: 10ms.
5 6 7
Time per step (ms.)
10
8