Od 300 Turns On But Does Not Turn Up!

2. Plug it in to make sure it doesnt just turn on, it didn't so unplug it

3. Removed and checked the front ON switch for power continuity (with power turned unplugged, just use a multimeter on continuity check.

4. Removed and checked the two fuses on each of the amplifier circuit boards

5. Removed and checked continuity of the power connector through that fuse

6. Used a multimeter to check every easily accessible diode

7. Checked to see if any of the electrolytic capacitors had "popped tops" (if they had blown)

8. Now the scary part: unplug the power cables (yellow and orange) going from the huge inductor/transformer to each of the amplifier boards, and then plug power into the amp and turn it on. Use extreme caution, there is live 120V leads in areas that you can touch with your hand! I recommend using only 1 hand while anywhere near a large voltage, incase of any shock, the current wont go through your heart.

9. Use a multimeter to check the voltages coming out of those two power cables, they should be somewhere around 70Vrms.

10. Everything checked out ok, so I turned power off. Plugged everything back in where is was supposed to be, and turned the power back on. And it worked!! There was probably a loose connection or an oxidized lead.

11. Praised the Lord for His love. :-)

https://www.ifixit.com/Answers/View/2453/Why+won't+my+Amp+power+up

Thanks