Using A Video Monitor; Using A Checker; Using The Test Card - Hitachi RAS-25CNH1 Service Manual

You can check the remote control switch by other methods as explained below.
(1)

Using a video monitor

Connect a video camera to a TV and aim at the remote control switch. If infrared rays are emitted from the
switch, you will see a flash in violet on the monitor screen.
Remote control switch
(2)

Using a Checker

You can make a checker by yourself. Its circuit diagram is shown below.
(3)

Using the test card

Video camera
3
3
3
Light receiving unit
(0V)
1
(5V)
2
The sensible area should flash in orange when you
operate the remote control unit if is good.
DC5V
+
Electrolytic
LED
-
capacitor
100µ10V
1k 1/4W
Carbon resistor
0V
3
Viewed from the Light receiving
unit terminal side
Ultra redray test card
Sensible area
Within 2 cm
– 103 –
TV
Regulated power supply
5V
-
+