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Old 5th February 2010, 07:37 PM   #1
tommy1 is offline tommy1  United States
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Default Need Help About Speaker Relay!

Hello everyone,
Does the speaker relay turn on with out the output TRANSISTORS?

Thank you!
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Old 5th February 2010, 08:14 PM   #2
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The output transistors turn on before the relay does.

There is usually a couple of second delay from when teh amp is powered up until the output is connected to the speakers.
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Old 5th February 2010, 08:46 PM   #3
tommy1 is offline tommy1  United States
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Thank you for relying.
What I mean was "can the relay kick on if the OUTPUT TRANSISTORS WERE TAKEN OUT OF THE CIRCUIT BOARD?"

Without the OUTPUT ...C: 33 Volts, Bass: 32 Volts, E: 0 Volts. When I put the OUTPUT back in the circuit board
then the Bass turns to be zero Volts ????

Last edited by tommy1; 5th February 2010 at 08:54 PM.
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Old 6th February 2010, 12:17 PM   #4
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Depends on what the removal of the transistors does to the feedback loop. So the answer here is 'maybe'. A schematic of your amp would help.
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Old 6th February 2010, 02:14 PM   #5
maxpou is offline maxpou  Canada
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Hi Tommy1,
why do you removed the output transistors? Maxpou
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Old 6th February 2010, 02:29 PM   #6
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If the relay control circuit is designed properly it will not turn them on if there is any appreciable DC on the output of the amplifier.

An amplifier without any output transistors might show one of the rail voltages on the output, this would stop the relays from closing.

On the other hand, if the output transistors had blown and the rail fuses blew as a result, then there might be no DC on the output and the relays will close. That is if the relays and control circuitry are not powered after the amplifiers rail fuses.

What is it that's gone wrong?
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Old 6th February 2010, 04:58 PM   #7
tommy1 is offline tommy1  United States
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...ansewering to MAXPOU. I removed the output transistors for safety. However, the Amp is working execpt the relay does not kick on because of the IC C1237.
I got the audio output before the relay. So far, I have replace the UPC1237HA.

Thank you so much to all the friends in this forum !
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Old 8th February 2010, 09:10 PM   #8
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what make and model amp is it?
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Old 8th February 2010, 09:53 PM   #9
tommy1 is offline tommy1  United States
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The model # a-501 made by API
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Old 8th February 2010, 10:06 PM   #10
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Quote:
Originally Posted by tommy1 View Post
...ansewering to MAXPOU. I removed the output transistors for safety. However, the Amp is working execpt the relay does not kick on because of the IC C1237.
I got the audio output before the relay. So far, I have replace the UPC1237HA.

Thank you so much to all the friends in this forum !
The UPC1237 will keep the relay open if there is a little DC on the output. Can you measure the output DC with no signal?

jd
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