T3 power unit

guido1968 · Post by **guido1968** » Sun Dec 24, 2017 8:43 am

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

voip · Post by **voip** » Sun Dec 24, 2017 12:27 pm

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

guido1968 · Post by **guido1968** » Wed Dec 27, 2017 6:34 pm

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