Hitachi RAK-18QXD Service Manual page 55

6. Initial Setting Circuit (IC531)
When power is supplied, the microcomputer reads the data in IC531 (E PROM) and sets the preheating
activation value and the rating and maximum speed of the compressor, etc. to their initial values.
Data of self-diagnosis mode is stored in IC531; data will not be erased even when power is turned off.
Initial Setting Circuit (IC531 and IC532) - For RAK-18QXD only
When power is supplied, the microcomputer reads the data in IC531 and IC532 (E PROM) and sets the
preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values.
Fig. 6-1
Fig. 6-2
1.2
1.2
2
1.2
1.8
(3 6)
- 55 -
2
1.8
(1 4)
532
531
1.8