Hitachi RAS-EH36PHLAE Service Manual page 74

11. Stepping motor drive circuit
Microcomputer
Vertical air flow L-�4
Vertical air flow L-�3
Vertical air flow L-�2
Vertical air flow L-�1
Horizontal air flow R-�4
Horizontal air flow R-�3
Horizontal air flow R-�2
Horizontal airflow R-�1
[Connector circuit waveform while the motor runs]
Voltage waveforms of different phases as viewed from
the OV line while the motor rotor is turning counterclockwise
as viewed from the shaft side
c!>4 terminal
c!>2 terminal
c!>1 terminal
1 ..-J
• Each stepping motor runs as excited in 1 or 2 phases at 100 PPS or 200 PPS.
• The excitation pattern passes the microcomputer (IC601) and then the driver IC and excites the coil of each stepping motor.
Some models not need to install the horizontal sweep motor.
12V
Fig. 11-1
.---
5 ms. or 10 ms.
Fig. 11-2
CN9
CN12
74