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HELP HELP HELP - Just blew my amp, can't afford a new one.
HELP HELP HELP - Just blew my amp, can't afford a new one.
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Old 9th February 2018, 07:05 PM   #31
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
The cpu May signal check amp output in some self test, and with shorted outputs or no outputs it may be not be getting some signal in a test.

More computer power in these things than a old pc...
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Old 9th February 2018, 07:10 PM   #32
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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This amplifier is uProcessor controlled and if the output lines of each amplifier do not do as prescribed upon power up, after some 250mS the power supply shuts down.
You know it is the Left Front amplifier that was killed. Replace the output transistors, driver transistors, emitter resistors (if open circuit and follow the set up instructions on page 12 of the manual). It is a very simple amplifier, the uProcessor makes it seem complicated. You could use a power supply to hook onto the amplifier board for testing but ensure you limit the current to a hundred milliamperes or so.
There are a number of Fire Proof resistors so any resistor with the triangle sign may have failed but only on the one channel. Don't get confused!
The schematic is page 9/9 of the schematic section.
You have 250mS to fault find each time.
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Old 9th February 2018, 07:13 PM   #33
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
Was thinking that.... makes me miss the TA7317P setups
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Old 9th February 2018, 07:36 PM   #34
nannoo is offline nannoo
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OK guys thanks for putting me in the right direction, turns out as well as TR121 and TR123 it was also TR111 that was causing a short. It's now powering up fine, going to try wiring it up and see if it makes sound/works again
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Old 9th February 2018, 07:39 PM   #35
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
Well the LF channel won’t :P
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Old 9th February 2018, 08:10 PM   #36
nannoo is offline nannoo
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We're back in business, only 6 channels but who needs 7 anyway
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Old 9th February 2018, 08:21 PM   #37
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
Do turn off amp if changing speaker wiring...
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Old 10th February 2018, 01:09 PM   #38
phase is offline phase  United States
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My mother had done that to an older Kenwood amplifier, I replaced the mt 200 output transistor and it has been running fine ever since.
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