Hitachi RAS-50WX8 Service Manual page 65

8. Initial Setting Circuit (IC401)
When power is supplied, the microcomputer reads the data in IC401 (E
activation value and the rating and maximum speed of the compressor, etc. to their initial values.
Data of self-diagnosis mode is stored in IC401; data will not be erased even when power is turned off.
1
2
3
4
2
IC401 (E PROM)
0V
9. Temporary Switch Circuit
Temporary
switch
The temporary switch is used to operate the air conditioner temporarily when the wireless remote control
is lost or faulty.
The air conditioner operates in the previous mode at the previously set temperature. However, when the
power switch is set to OFF, it starts automatic operation.
5V
8
C401
7
0V 0V
6
5
5V
R601
C611
2
PROM) and sets the preheating
5V 5V
Fig. 9-1
TEMPORARY SW
48
R602
MICROCOMPUTER
0V 0V
Fig. 10-1
– 104 –
Microcomputer
27 SCL
}
External ROM
26 SDA