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Soundcraftsmen 900X2
Soundcraftsmen 900X2
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Old 13th July 2005, 12:58 AM   #21
cygnusxi is offline cygnusxi  United States
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Attached should be a compressed picture of the top of the board. Hopefully it is clear. The orignal picture shows the brown spots clearly.
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File Type: jpg 450x2 0122.jpg (28.5 KB, 563 views)
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Old 13th July 2005, 12:58 AM   #22
cygnusxi is offline cygnusxi  United States
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Attached is a picture of the caps with white vents one a little discolored.
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File Type: jpg 450x2 0142.jpg (24.4 KB, 523 views)
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Old 13th July 2005, 01:27 PM   #23
still4given is offline still4given  United States
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Soundcraftsmen 900X2
Quote:
Originally posted by cygnusxi
The burn marks (light brown squiggly lines) I saw were on the top side of the board. I'll try to take some pictures of what I see and post them. I don't recall the caps being vented, but I'll look again and try and take a picture of those too.

Thanks again.

Squiggly lines sounds like maybe at some time a wire over heated.
Just a thought.

Blessings, Terry
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Old 13th July 2005, 05:52 PM   #24
oPossum is offline oPossum  United States
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The only brown spots I can see on the PCB are at the leads of the big power resistor on the lower left. That is normal for this amp, that resistor runs hot! Is that it, or did I miss some other spot?

The caps look fine, but they are still the primary suspect. Sometimes parts fail without any noticable physical damage.
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Old 13th July 2005, 06:40 PM   #25
cygnusxi is offline cygnusxi  United States
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Thank you for the responses. Those are the darkest spots on the board. Since I understand these parts are so inexpensive, who should I order them from?
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Old 15th July 2005, 04:00 AM   #26
vhinze is offline vhinze  United States
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I'd go with Newark Electronics. Be sure to meet or exceed the voltage rating of the existing part.
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Old 28th July 2005, 12:32 PM   #27
patm is offline patm  United States
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Default ebay has a PM840 now!

There is a PM840 on ebay right now:
http://cgi.ebay.com/Soundcraftsmen-S...QQcmdZViewItem
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Old 2nd September 2005, 08:29 PM   #28
cygnusxi is offline cygnusxi  United States
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Default Final analysis

FYI:

To fix the loud buzz and tripping the breaker, I took my amp to Diversified Audio in Tampa, Florida and they found it was a single SCR in the power supply. They advised no reason to replace anything else.

Thanks for everyone's input.
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Old 21st November 2005, 03:56 AM   #29
screamersusa is offline screamersusa  United States
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Unhappy Soundraftsmane 900x2 Power supply Help

Greetings and thanks for all the guidance so far.

My 900x2 is running with supply voltages at 102 volts instead of 87. Unfortunately my copy of the schematic does not include the scr board and the power controller/relay board print is unreadable. Anyone have the print for these two boards.
Thanks.
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Old 19th July 2007, 09:01 AM   #30
marconzio1 is offline marconzio1  United States
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Red face My capicitors burned out in my 900x2

does anybody know where i can get the capacitors for the 900x2? i can't seem to find them anywhere... Also, on the top of the capacitors, there are numbers, one is 22 and the other is 13.

not certain where to get these. by the way, i found a guy on the internet who said he sells the orginal schematics for the soundcraftsman amps at http://www.gourmetpa.com/s.html
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