Brooke Amplifier Problem |
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JayeJSAV
Registered User Joined: 24 October 2012 Location: Leeds Status: Offline Points: 28 |
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Rebuild :/
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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+lots! This is an incredibly useful piece of test equipment. It will generally allow you to fire up a piece of suspect equipment and determine if it's going to do serious damage if you give it full mains. Quite often once the PSU caps have all charged, a fault-free amp will run with no-load even with the lamp inline. If you power it up and the lamp stays bright, you know that there is still a fault to look for. As well as one in a mains lead (with bypass switch), I also have a lamp on flying leads which I can insert into circuits instead of fuses etc. |
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Tan-2
Registered User Joined: 29 April 2011 Location: Glasgow Status: Offline Points: 255 |
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JayeJsav.... after looking at the photo it's a straight forwards amplifier module with signal transistor in put pair etc etc.. Now that you've got the psu working run up the working channel to determine volts at given points also take note of current draw and bias volts over the o/p emitter resistors.
Things can take longer with out a handy schematic but with some time most amps are common to solve.
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Logic will get you from A to B. Imagination will take you everywhere.
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JayeJSAV
Registered User Joined: 24 October 2012 Location: Leeds Status: Offline Points: 28 |
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Having a nightmare with hires on A-Level night, plus trying not to kill too many kids on the roads.....
Be back on it this weekend for some more midnight oil burning, with Jagerbomb aftertaste.... Thanks again guys :) |
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Tan-2
Registered User Joined: 29 April 2011 Location: Glasgow Status: Offline Points: 255 |
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How did you get on with amp in the end?
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Logic will get you from A to B. Imagination will take you everywhere.
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JayeJSAV
Registered User Joined: 24 October 2012 Location: Leeds Status: Offline Points: 28 |
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Stripped board back, as before, but been so busy on installs for freshers that I've not been at it since!
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CHAMPION
Old Croc Joined: 30 September 2004 Location: United Kingdom Status: Offline Points: 3667 |
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Speak to Andy at Impact im sure he can dig out the manual
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Sticks n Stones
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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i have a cave audio cv4000 here with a fault too. it belongs to a friend, i said i'd have a quick look at it.
it doesn't power up, blew the T20A fuse straight away. bringing it up with a variac and light bulb in series gives a bright glow immediately and a mild burning smell even as i get to about 50v.. i think this one is beyond me really. but fwiw the cv4000 seems to be the brooke model below yours, as in, it's got gaps for more output devices, where in the photos, yours is fully populated. |
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Tan-2
Registered User Joined: 29 April 2011 Location: Glasgow Status: Offline Points: 255 |
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Cravings, carry out some straight ward checks... remove the power supply plugs that feeds both modules now, replace that blown fuse.. next power up via doing this your testing the psu is ok.
next test o/p devices for short circuit which will be the case here then test driver transistors etc... Glowing bulb is showing you that there is a short.. |
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Logic will get you from A to B. Imagination will take you everywhere.
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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thanks for tips..
right.. disconnected the 2 channel boards from the psu, up to 20v, glowing pretty brightly, no change with the boards disconnected there... not a good sign really. |
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JR.junior
Old Croc Joined: 14 December 2009 Location: Slovenija Status: Offline Points: 1789 |
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have you checked bridge rectifier?
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Support the scoop technology, larger mouth plays louder!
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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yeah, went over all of them yesterday with the diode test on a meter... all as expected.
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