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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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Dell
Got a Dell computer with something called a 110 Twin Alert.
This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? greg |
#2
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Dell
On Tue, 28 Apr 2009 18:21:38 GMT, (GregS)
put finger to keyboard and composed: Got a Dell computer with something called a 110 Twin Alert. This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? greg Could it be this warning device with a 110dBa sounder and a low wattage speaker? http://www.pyronix.com/pdf/Data0305%20TwinA.pdf The pinouts a Symbol Description ---------------------------- - 0V + 12V BA Siren Trigger SPK Speaker T Tamper T Tamper I can't see how it would be responsible for shutting down your power supply, though. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#4
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Dell
In article , (GregS) wrote:
In article , wrote: On Tue, 28 Apr 2009 18:21:38 GMT, (GregS) put finger to keyboard and composed: Got a Dell computer with something called a 110 Twin Alert. This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? greg Could it be this warning device with a 110dBa sounder and a low wattage speaker? http://www.pyronix.com/pdf/Data0305%20TwinA.pdf The pinouts a Symbol Description ---------------------------- - 0V + 12V BA Siren Trigger SPK Speaker T Tamper T Tamper I can't see how it would be responsible for shutting down your power supply, though. Thats was interesting. I will post a picture later. greg So here is a picture. I think its just a temp warning beeper that went bad and shorting out supply. Weird. http://zekfrivolous.com/misc/twinalert.JPG greg |
#5
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Dell
On Wed, 29 Apr 2009 15:50:59 GMT, (GregS)
put finger to keyboard and composed: In article , (GregS) wrote: In article , wrote: On Tue, 28 Apr 2009 18:21:38 GMT, (GregS) put finger to keyboard and composed: Got a Dell computer with something called a 110 Twin Alert. This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? greg Could it be this warning device with a 110dBa sounder and a low wattage speaker? http://www.pyronix.com/pdf/Data0305%20TwinA.pdf So here is a picture. I think its just a temp warning beeper that went bad and shorting out supply. Weird. http://zekfrivolous.com/misc/twinalert.JPG greg It looks like the Pyronix device is something completely different. How do both trademarks coexist ??? Here is a PC Power & Cooling alarm that is similar to yours. 110 Alert Heat Alarm: http://www.pcpower.com/accessories/1...eat-alarm.html It is set to go off when the temperature reaches 110 deg F. It doesn't appear to do anything other than alert the user, though. OTOH your device appears to shut down the PSU. You can see the thermistor below the second M in the LM339M quad comparator. Could that be a crowbar SCR across the +12V or +5V input? What are the two large parts at the RHS of the PCB? The only useful reference I can find to TwinAlert with Google is this one: http://www.kaldata.com/forums/index....ic=26035&st=30 This is a Google translation: ================================================== ============== Sensory devices for heat Thus, this problem could be avoided entirely by using the company's 110 Twinalert PC Power and Cooling Systems. Twinalert represents 110 bus to the size of a credit card that is connected to the plug such as power flopito. When the temperature in the PC-it reaches 43 degrees, the device starts to squeak, creating annoying noise, and in 47 degrees just excludes computer. It cost under $ 50 ... ================================================== ============== - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#6
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Dell
GregS wrote: (GregS) wrote: wrote: On Tue, 28 Apr 2009 18:21:38 GMT, (GregS) put finger to keyboard and composed: Got a Dell computer with something called a 110 Twin Alert. This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? Could it be this warning device with a 110dBa sounder and a low wattage speaker? http://www.pyronix.com/pdf/Data0305%20TwinA.pdf The pinouts a Symbol Description ---------------------------- - 0V + 12V BA Siren Trigger SPK Speaker T Tamper T Tamper I can't see how it would be responsible for shutting down your power supply, though. Thats was interesting. I will post a picture later. So here is a picture. I think its just a temp warning beeper that went bad and shorting out supply. Weird. http://zekfrivolous.com/misc/twinalert.JPG LM339 is a quad comparator. The board is also legended 'power and cooling'. I'd guess it monitors temp and several supplies. Graham |
#7
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Dell
GregS wrote:
In article , (GregS) wrote: In article , wrote: On Tue, 28 Apr 2009 18:21:38 GMT, (GregS) put finger to keyboard and composed: Got a Dell computer with something called a 110 Twin Alert. This little board on the top of the chassis is shutting down the power supply. I thought it might have been some kind of temperature alert gone bad. Got Got some power circuitry with a beeper. ?? greg Could it be this warning device with a 110dBa sounder and a low wattage speaker? http://www.pyronix.com/pdf/Data0305%20TwinA.pdf The pinouts a Symbol Description ---------------------------- - 0V + 12V BA Siren Trigger SPK Speaker T Tamper T Tamper I can't see how it would be responsible for shutting down your power supply, though. Thats was interesting. I will post a picture later. greg So here is a picture. I think its just a temp warning beeper that went bad and shorting out supply. Weird. http://zekfrivolous.com/misc/twinalert.JPG It looks like it's monitoring the temperature (there's a thermistor on the bottom right of the PCB). I notice that it has a local regulator, which I'd be guessing is a 7805 that's shorted out. -- W . | ,. w , "Some people are alive only because \|/ \|/ it is illegal to kill them." Perna condita delenda est ---^----^--------------------------------------------------------------- |
#8
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Dell
On Thu, 30 Apr 2009 19:44:02 +1000, Bob Larter
put finger to keyboard and composed: http://zekfrivolous.com/misc/twinalert.JPG It looks like it's monitoring the temperature (there's a thermistor on the bottom right of the PCB). I notice that it has a local regulator, which I'd be guessing is a 7805 that's shorted out. The pinout for a 7805, from top to bottom, is "In Gnd Out". This doesn't fit with the "+12V Gnd Gnd +5V" pinout of a drive connector. In any case why would you need a local +5V regulator when the incoming supply already provides +5V? If for some reason you did need a +5V regulator, then wouldn't a 78L05 be adequate for this circuit? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#9
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Dell
Franc Zabkar wrote: On Thu, 30 Apr 2009 19:44:02 +1000, Bob Larter put finger to keyboard and composed: http://zekfrivolous.com/misc/twinalert.JPG It looks like it's monitoring the temperature (there's a thermistor on the bottom right of the PCB). I notice that it has a local regulator, which I'd be guessing is a 7805 that's shorted out. The pinout for a 7805, from top to bottom, is "In Gnd Out". This doesn't fit with the "+12V Gnd Gnd +5V" pinout of a drive connector. In any case why would you need a local +5V regulator when the incoming supply already provides +5V? If for some reason you did need a +5V regulator, then wouldn't a 78L05 be adequate for this circuit? That heatinked device seems rather odd, not least the way it's mounted with bent leads. Graham |
#10
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Dell
Franc Zabkar wrote:
On Thu, 30 Apr 2009 19:44:02 +1000, Bob Larter put finger to keyboard and composed: http://zekfrivolous.com/misc/twinalert.JPG It looks like it's monitoring the temperature (there's a thermistor on the bottom right of the PCB). I notice that it has a local regulator, which I'd be guessing is a 7805 that's shorted out. The pinout for a 7805, from top to bottom, is "In Gnd Out". This doesn't fit with the "+12V Gnd Gnd +5V" pinout of a drive connector. In any case why would you need a local +5V regulator when the incoming supply already provides +5V? If for some reason you did need a +5V regulator, then wouldn't a 78L05 be adequate for this circuit? looks again Yeah, you're right about it not being a 78xx reg. I must've been a bit slydexic when I first looked at it. -- W . | ,. w , "Some people are alive only because \|/ \|/ it is illegal to kill them." Perna condita delenda est ---^----^--------------------------------------------------------------- |
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