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Media center cannot change channels using set top box
Running Windows 7 pro on a Dell T3400 pc.
My TV tuner is a Haupauge WinTV HVR 1850. It comes with an IR blaster and receiver.
My cable company is Comcast. I have a small set top box. I guess it's called a dta.
A piece of paper inside the set top box says it is a Pace DTA. I will refer to it as a set top box.
I cannot get Media center to change channels using the set top box.
I have tried to manually configure Windows Media Center to control the set top box. I have tried all the codes for the Pace set top box. Nothing works.
I know the set top box receives signals. I can change channels using the Pace remote.
I know the IR receiver works. Windows Media Center responds when I press buttons on the Windows Media Center remote.
Q1.) How can I test the blaster to make sure it is sending signals?
Q2.) How can I find codes which work with the Pace set top box?