Auto Sweep Motor Circuit; Microcomputer Output Signals - Hitachi RAS-18FH6 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 pin E E E E E ~ H H H H H of
microcomputer.
Micro computer pins
Horizontal air deflectors
15
16
17
18
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.
Table 4-1 Auto sweep Motor Rotation
Horizontal air deflectors
IC711
18 7
6
17
16 5
4
15
1 2
Fig.4-2 Microcomputer Output Signals
Rotation angle per step
0.0882
12V
CN4
10
11
12
13
Fig.4-1
Step width : 10ms
3 4 5
) Time per step (ms.)
– 32 –
Auto sweep motor for
horizontal air defectors
Rotor
6 7 8
10