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Old 11th February 2007, 04:50 PM   #1
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Default Need Cambridge A500 help

I just picked up a A500 the fuses on the main board keep blowing.
I was wondering if anyone had any ideas ?
Should I replace the SAP15's, and see what happens?
I saw in another thread , OzOnE_2k3 had some experiences repairing these , If you are out there could you chime in?
thanks in advance. I will contact Cambridge Audio and see if I could get a Schematic.
mdr
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Old 11th February 2007, 05:34 PM   #2
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1.Check your rectifiers and capacitors in the power supply section.
2. Check for collector to emitter shorts on the final outputs.
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Old 11th February 2007, 07:28 PM   #3
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do I have to de-solder them or can i check them on the board?
thanks
I'm a neewb for now
mdr
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Old 11th February 2007, 08:58 PM   #4
jaycee is offline jaycee  United Kingdom
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You should desolder the transistors to check them.

You may also want to check the MJE340/350 transistors as these could've gotten fried as well.
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Old 11th February 2007, 09:01 PM   #5
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Do you know how to check a diode or rectifier with a dmm. Do you have a dmm. To answer your question ideally yes, lift one side of the diode. If you have a bridged rectifier it would be best to removed from board.
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Old 11th February 2007, 10:27 PM   #6
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I've got a DMM, but looking to get one that is also an LCR meter. Any thoughts on an inexpensive one?
Thanks for your advice I'll set apart some time tomorrow to test them.
mdr
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Old 11th February 2007, 10:48 PM   #7
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I picked up an el'cheapo lcr off of ebay no- name brand for $29 probably only good for ballpark measurements. Fluke has always be a good bet!
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Old 11th February 2007, 11:05 PM   #8
MikeW is offline MikeW  United States
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Default Take a look

Sometimes there is a burnt mark or other evidence of what blew up. I have blown the top right off some transistors.
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Old 2nd August 2007, 06:02 PM   #9
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Hi all.
I got the replacement SAP15 N&P.
Soldered them in and the amp doesn't blow, But the channel that I replaced the SAP's has a lot of static like you are trying to connect a speaker with the amp on. I have the schematic that Cambridge Audio was kind enough to send me.
here
Any help would be appreciated.
thanks
mdr
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Old 2nd August 2007, 10:30 PM   #10
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mdelrossi
First lets see if your power supply is working. I need to know what the voltages are on pins 2 & 3 of U203 and U204.
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