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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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ir receiver module, testing and identifying
I have a Onkyo TX-8211. It's become unresponsive to both the factory
remote and a universal remote that was programmed to control it. I popped it open to inspect the receiver module. I couldn't see any markings on it (without removing it from the pcb, anyway). I measured 5V on the supply line. On the output line I could see a digital signal that was about 120mV peak-to-peak when I sent an IR signal from one of the remotes. Anyone know if this is typical of the output? Should the signal be larger? If the module needs to be replaced, how would I identify a replacement? Since it is generating a signal I'm wondering if some other part has failed. There's an electrolytic cap wired to it, which I'm eying suspiciously. |
#2
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ir receiver module, testing and identifying
On Thu, 22 Apr 2010 17:54:33 -0700 (PDT), Brian
put finger to keyboard and composed: I have a Onkyo TX-8211. It's become unresponsive to both the factory remote and a universal remote that was programmed to control it. I popped it open to inspect the receiver module. I couldn't see any markings on it (without removing it from the pcb, anyway). I measured 5V on the supply line. On the output line I could see a digital signal that was about 120mV peak-to-peak when I sent an IR signal from one of the remotes. Anyone know if this is typical of the output? Should the signal be larger? If the module needs to be replaced, how would I identify a replacement? Since it is generating a signal I'm wondering if some other part has failed. There's an electrolytic cap wired to it, which I'm eying suspiciously. AIUI, these modules produce TTL level outputs. Just be sure to use a pullup resistor on the output, as it may be open collector. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#3
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ir receiver module, testing and identifying
On Tue, 27 Apr 2010 19:00:07 +1000, Franc Zabkar
put finger to keyboard and composed: AIUI, these modules produce TTL level outputs. Just be sure to use a pullup resistor on the output, as it may be open collector. FWIW, here are datasheets for Sharp IR receiver modules: http://www.datasheetarchive.com/search.php?q=GP1U - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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