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#21944 - 07/09/10 03:20 PM May have fried Ocelot IR port
Deane Johnson Offline
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Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
I may have fried the IR mini-jack output port today. It's been connected to a Xantech 791-44 amplified connecting block through one of Guy's signal amplifier circuits for the past 10 years and working just great.

Today I tried to get a new USB-UIRT connected to my Xantech as I switch over to computer control of my home theater. I may have fried the Xantech also.

I wonder the best way to determine if it's fried? I plugged an emitter into it and get no flash on the emitter. My emitters connected to the Xantech get no flash either.

If it's fried, what's the most likely component I'd need to replace?

Deane

Edited by Deane Johnson (07/09/10 03:22 PM)
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#21946 - 07/09/10 05:22 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
Beyond All Hope
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Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
Not sure of which component drives the IR output, but chances are it's a surface mount part unless you have one of the older Ocelots. Are the parts all surface mount in your Ocelot?
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#21948 - 07/09/10 05:51 PM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
I'll have to look. It's about 10 years old. It's fastened to the wall behind my rack and will take a little doing to get loose.
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#21949 - 07/09/10 07:30 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
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Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
I just checked out a CPUXA that I have (with thru hole components) and it appears that IR out is driven (pulled up) by pin 13 of the PIC chip, with a 100 ohm resistor in series between the pin and the output jack. The 100 ohm resistor is located very close to the IR out jack, right beside the IR/X10 LED.

You could try unplugging and then reinserting the PIC chip. This is the long, narrow chip with a label on it.
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"If you don't know what you're doing, do it neatly..."

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#21950 - 07/11/10 03:45 AM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
Thanks for the update Guy.

Don't I remember some sort of a warning from a number of years ago that using the wrong mini-plug in the socket could blow it. Seems it requires mono and a stereo will short it, or vice-versa.

I suppose my bad habit of plugging and unplugging things that are live jumped up and bit me this time.

I'm working to get my essential usage over to a software controller so I can shut the Ocelot down and dig into what happened.

Edited by Deane Johnson (07/11/10 03:46 AM)
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#21952 - 07/11/10 05:19 AM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
Further experimenting would indicate I didn't fry the Ocelot after all. I can get a blink with an emitter plugged direct in.

When I jumper from the Ocelot IR out direct in to a Xantech amplified connecting block, I get a red led flash on the Xantech. However, I get nothing out of the Xantech.

When I connect the "Guy Lavoie booster amplifier" back in between the Ocelot and the Xantech, I don't get an indication of receipt on the connecting block, so I must have fried something in the light amplifier.

But in addition, I must have messed something up in the Xantech also.

Bizarre to have two things get fried at once.

Thanks for your help on the Ocelot. Any tips on troubleshooting the "GL Light Booster"?
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#21953 - 07/11/10 05:55 AM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
I believe the problem has been located. When I plugged the USB-UIRT into the IR output of the Ocelot, using the socket, I apparently shorted the Xantech power cube and blew it.

Reading the Xantech forum, someone mentioned you can't do that due to 12v being present on that jack. That led me to wonder if that's what happened, so I measured the output of the wall cube. Nothing. Had a substitute here, so plugged it in and all went back to normal.

At the present time, I'm running without the "GL light amplifier", but will check it out later.

Deane
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#21955 - 07/11/10 03:58 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
Beyond All Hope
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Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
Let me know how it turns out!
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"If you don't know what you're doing, do it neatly..."

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#21956 - 07/11/10 05:48 PM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
Any tips on how to trouble shoot it?
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#21957 - 07/11/10 06:49 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
Beyond All Hope
*****

Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
I'm not sure of exactly which part you are trying to troubleshoot at this point...
_________________________
"If you don't know what you're doing, do it neatly..."

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#21961 - 07/12/10 06:43 AM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
The voltage booster circuit that I believe you designed. The one that goes between the Ocelot and a Xantech block, raising the voltage from 5v to 12v.

I'm working fine when it's not in the circuit, but nothing goes through when I reinsert it.
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#21963 - 07/12/10 06:03 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
Beyond All Hope
*****

Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
you could test the circuit statically. You would need to power it up without connecting it to anything (input or output) and measure some voltages. Do you have a voltmeter and a few spare resistors (1k would be fine) handy?
_________________________
"If you don't know what you're doing, do it neatly..."

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#21965 - 07/12/10 06:48 PM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
Yes, I have several volt meters, and probably some resistors left over. If not, Radio Shack is nearby.
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#21977 - 07/14/10 07:44 PM Re: May have fried Ocelot IR port [Re: Deane Johnson]
Guy Lavoie Administrator Offline
Beyond All Hope
*****

Registered: 12/21/02
Posts: 6401
Loc: Montreal, QC, Canada
Ok, lets try this: power up the circuit by itself and connect the the input to common (shorting it to common) and connect a 1k resistor between the output and common. You should measure very close to 0v across the output and common (the 1k resistor you just added as a load).

Now disonnect the short across the input and connect the input to the +12v instead. The output across the added 1k resistor should also rise close to +12v.

Are you getting values close to this?
_________________________
"If you don't know what you're doing, do it neatly..."

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#21979 - 07/15/10 10:48 AM Re: May have fried Ocelot IR port [Re: Guy Lavoie]
Deane Johnson Offline
active contributor


Registered: 01/09/03
Posts: 186
Loc: Omaha, Nebraska
Thanks Guy. I'll do it this week end and report back.

Deane
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