Charged capacitors can cause personal injury or damage the device. Use caution when proceeding.

Discharge the capacitor by connecting the resistor jig between the highlighted squares.

Keep the resistor jig in place for at least ten seconds.

Create a 1kohm resistor jig (wrap the resistor with electrical tape leaving the ends exposed, use alligator clips, etc).

For reference, consult the service manual. Click to go to the service manual page on discharging the capacitor.