AMX Sensors and Receivers IR Guía para resolver problemas descargar pdf (Pagina 6)

Application Advisory

AA-3(IR TS)

Using a CFL-Friendly IR Receiver (291-80,

480-80, or 780-80) and trying to control a

unit with a carrier frequency greater then

40kHz (I.e. RCA DSS, Scientific Atlanta,

Jerald, and General Instruments Cable or

DSS Set Top Boxes).

If you are using the 291-80 or 780-80

CFL Friendly receiver, locate the Carrier

Frequency Adjustment on the unit and

using a small blade screwdriver, (3/32"

blade width max.) rotate the adjustment

for best performance of all the units in

the system. Note: The 480-80 version

does not have this feature; you will either

need to change the unit to a 291-80,

780-80 or the 490-90. The 490-90 is a

wide band unit and will not require any

frequency adjustment.

Symptom #7:

Absolutely No Functionality (How to determine which component is at fault)

Step: Component to Test Instructions

Verify Power Supply

With a Multimeter, measure the DC

Voltage of the supply while it is

connected to the Connecting Block. Put

the Negative lead of the meter on the

terminal marked GND and the Positive

Lead on the terminal marked 12VDC (or

V). You should get a reading between

11.5VDC and 13.0VDC. If not, remove

the supply from the Connecting block

and measure again this time directly on

the 2.5mm Coaxial plug. If it reads

between 11.5VDC and 13VDC, power

supply is most likely good. Reconnect to

the Connecting Block and proceed to

step 2. NOTE: In most cases this will

indicate the supply is good but in

some cases the supply can still be

bad (i.e. reads good when not

plugged in but may not be able to

handle the current load of the

system.)

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