Hitachi RAF-25FX8 Service Manual page 158

CHECKING THE REMOTE CONTROLLER
Is battery polarity correct?
Is the battery check sign + –
flashing?
Turn on an AM radio, bring
the remote control switch within
15 cm of the radio, and press
the ON/OFF button.
Does the radio buzz noisily?
Check the indoor unit signal
receiving P. W. B..
If it is good, check the main P. W. B.
You can check the remote control switch by
other methods as explained below.
Using the test card
The sensible area should flash in orange when you
operate the remote control unit if it is good.
No
Yes
Yes
No
No
Yes
Ultra redray test card
Sensible area
Within 2 cm
Install the battery in the correct polarity.
Replace the battery.
Check the LED (D1) with
a multimeter.
"Buzz"
Within 15 cm
[AM radio]
Check functions again.
If it does not work, replace
the remote controller.
– 176 –