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Fender Rumble 500
Fender Rumble 500
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Old 16th January 2018, 02:28 PM   #1
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Default Fender Rumble 500

Hello, I am trying to figure out my new to me fender rumble 500 amp and was hoping you guys could help. I get nothing out of the speakers when using the input jack but if i use the effects line in I get sound [low volume and not eq controllable or volume controllable]. If i add a boosted signal to the effects loop it cranks pretty good. I get no response from the instrument jack whatsoever. The head phone jack gives the same response if using effects loop only, nothing from instrument input jack. Lights all come on, heat sink fan runs, all seems normal but no sound. I looked at the boards and nothing looks cooked or out of the ordinary, any ideas? FYI I bought the amp in this condition so I have no idea of what caused its failure. Thanks in advance for any help.

Jim
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Old 16th January 2018, 02:51 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Which model? There are at least 3, all different.
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Old 16th January 2018, 03:29 PM   #3
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The latest version I believe..date code is late 2015 so I think V3
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Old 16th January 2018, 07:24 PM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Possible power supply failure.
Check R400 and R401.
Follow the signal through backwards from the effects towards the input.
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Old 17th January 2018, 05:53 AM   #5
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What should i be reading, will it be in volts[power on] or am I just looking for ohms/continuity?
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Old 17th January 2018, 04:56 PM   #6
Tarzan is offline Tarzan  Belgium
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Hi,
I do not have a schematic but I found these few lines some time ago. Maybe they can help.
Give it a try...
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Old 17th January 2018, 05:32 PM   #7
cbdb is offline cbdb  Canada
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Check the input jack and its solder connection.
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Old 19th January 2018, 04:45 AM   #8
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Will do thank you
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Old 19th January 2018, 04:46 AM   #9
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Tarzan I am not sure what lines youre refering to, forgive my ignorance
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Old 19th January 2018, 11:05 AM   #10
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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You are looking for about 15volts on each, + & - supplies to the ic's.
Pin 4 of the chips should have -ve 15 volts on them and pin 8 +ve 15 volts, if you cannot locate those resistors.
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