Fender Acoustasonic 90 power up problem

[fredcapo]

Fender Acoustasonic 90 power led blinks intermittently when the unit is powered up, no sound, then blinks for a few seconds when power cord is pulled, BUT, sometimes powers up and operates for a few seconds. Orange stick prodding turns up nothing... if anyone can post a schematic would appreciate, or any suggestions or similar problem diagnosed. Thanks

[The Dude]

Have you asked Fender for the schematic?

[Jon Snell]

There is a problem with the +-15volt supply.
I would replace C56/7 both 1000 35volt 105℃, U19 7815 and U20 7915 regulators and ensure the heatsink compound is cleaned off and replaced.

[Rock-It]

Jon Snell, Is your schematic screen-share from the FMIC P/N 841ICT025 Rev C? Do you have experience with this symptom on Fender Acoustasonic 90 amps? I have the same problem as fredcapo. So far, I have not located a schematic, and I know that this is a switcher PSU.

[Jon Snell]

Jon Snell, Is your schematic screen-share from the FMIC P/N 841ICT025 Rev C? Do you have experience with this symptom on Fender Acoustasonic 90 amps? I have the same problem as fredcapo. So far, I have not located a schematic, and I know that this is a switcher PSU.

The power supply I have shown is a linear supply, not switch mode.