Hitachi RAK-18QXB, Service Manual

Page: 55 / 92

When power is supplied, the microcomputer reads the data in IC531 (E PROM) and sets the preheating
2
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.
Fig. 6-1
6. Initial Setting Circuit (IC531)
1.2 1.8
1.8 1.2
531
Fig. 6-2
Initial Setting Circuit (IC531 and IC532) - For RAK -18Q X B only
When power is supplied, the microcomputer reads the data in IC531 and IC532 (E PROM) and sets the
2
preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values.
1.2 1.8
(1 4)
(3 6) 532
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