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T3 power unit

 
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guido1968



Joined: 24 Dec 2017
Posts: 2

PostPosted: Sun Dec 24, 2017 8:43 am    Post subject: T3 power unit Reply with quote

Hello,
my T3 power unit is off, I changed R7 that was burnt, it gives +12-V, -12V but not +5V.
Any help?
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voip
Platinum Member


Joined: 27 Nov 2014
Posts: 3758

PostPosted: Sun Dec 24, 2017 12:27 pm    Post subject: Reply with quote

If the +/-12V supplies are nominal, check, and replace if necessary, D5, L3, C20, C21. Check also for burnt circuit board tracks.
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guido1968



Joined: 24 Dec 2017
Posts: 2

PostPosted: Wed Dec 27, 2017 6:34 pm    Post subject: Reply with quote

hi,
I changed Q2 and R7, I have all voltages ok (-12, +12 and +5), but the display is blank and the keyboard not working at all, no lights on buttons, etc.


HELP
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