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The reset circuit initializes the microcomputer program when power is ON or OFF.
●
Low voltage at pin
7
resets the microcomputer and Hi activates the microcomputer.
●
When power “ON” 5V voltage rises and reaches 4.4V, pin 1 of IC521 is set to “Hi”. At this time the
microcomputer starts operation.
●
When power “OFF” voltage drops and reaches 4.2V, pin 1 of IC521 is set to “Low”. This will RESET the
microcomputer.
DESCRIPTION OF MAIN CIRCUIT OPERATION
MODEL RAI-25NH5, RAI-35NH5
1. Reset Circuit
Fig. 1-1
Fig. 1-2
2
1
5
3
7
NORMAL : HI
RESET
: LO
RES
Microcomputer
C524
R521
C522
C521
R522
5V
0V
IC521
Voltage
5.0V
Reset enter at 4.2V
Reset release at 4.4V
voltage
5.0V
Voltage at pin
7
of microcomputer
Voltage supply to
pin
2
of IC521
Содержание RAI-25NH5
Страница 31: ... 29 MODEL RAI 25NH5 RAI 35NH5 WIRING DIAGRAM INDOOR UNIT ...
Страница 33: ...CIRCUIT DIAGRAM MODEL RAI 25NH5 RAI 35NH5 33 ...
Страница 36: ... 39 47 RAI 25NH5 RAI 35NH5 ...
Страница 58: ... 68 CHECKING THE REMOTE CONTROLLER ...
Страница 59: ... 69 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAI 25NH5 RAI 35NH5 17 18 13 2 4 8 14 3 1 5 12 6 7 15 ...
Страница 62: ...HITACHI PM NO 0271E Printed in Malaysia RAI 25NH5 RAI 35NH5 ...