Hitachi RAS-07G4 Service Manual page 47

5. Receive circuit
Infrared signals from the wireless remote controller are received by the light receiving unit and output after
being amplified and shaped.
6. Service Operation Circuit
Use the service switch to select "Cooling" temporarily when the interior electric equipment has troubled.
G
Setting the switch to "Cooling" causes continuous cooling room temperature control. To control the room
G
temperature, turn on and off the disconnect switch. To protect the compressor, wait at least 3 minutes
before turning on again.
The fan speed is "MED".
G
Does not operate is 12V is not generated in the control circuit.
G
When the service switch is used for operation, each change switch is overridden.
G
Setting the service switch to "Cooling" turns on the "Power relay".
G
Q141
R141
R212
Receiver
Unit
R211
0V
Micro computer
(AX-3U)
FORCE COOL 33
12V
Micro computer
(AX-3U)
18 WIRELESS I/P
R209
C702
0V
5V
R614
R629
0V
0V
– 52 –
Cool
Normal