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Post subject: Princeton 650 problem
Posted: Sat Oct 30, 2010 5:09 pm
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Joined: Wed Oct 27, 2010 1:46 pm
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Princeton 650 problem
:!: :oops: :( Working about 1hour.

R107 and R118 and R119 and LM 7805 are overheatin for about 10 min.
after that silent....


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Post subject: Princeton 650 problem
Posted: Sat Oct 30, 2010 6:22 pm
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Joined: Tue Jun 29, 2010 1:20 pm
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Location: Indiana
Hi Cholle64,

The resistors R118 and R119 are 5 watts and should be too hot to touch, that is normal. Those two resistors are in the power supply and are there to dump excess power, so they get very hot. R107, also a 5 watt, will be hot to the touch also, this is normal. The voltage regulator U8 (LM 7805) also in the power supply, will be very hot when operating normally. So those areas may not be a problem at all.

Did it blow a fuse? If not, look for a reset button, check the manual for how to reset.

Here are the schematics for download, if you don't have them.

http://support.fender.com/schematics/guitar_amplifiers/Princeton_650.pdf

Here is the amp manual for download.

http://support.fender.com/manuals/manuals_elec/guitarpdf//Princeton_650.pdf

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