Why can there be low power to the capture motor?

Question

Electronics

Good day. In the risograph, a voltage of 20 volts goes to the 24 volt motor, from this there is not enough power to capture heavy paper like drawing paper.
What can be called on the board? Where to dig? The appearance is normal, nothing is swollen, not burned.
What would you do? There is an opportunity to repair only on their own.
Please suggest a solution, I'm attaching a photo.
https://www.dropbox.com/sh/ckjpnewkllb1zch/AAAPSKQ...

Answer 1

Was it ok before? How does it behave without load? The fact that nothing is swollen does not mean that everything is fine there, in such cases I solder one capacitor at a time and measure the capacitance and internal resistance (the second parameter is also important and if there is a deviation, such a capacitor must be replaced)

Answer 2

The two most likely options:
1. The power supply is dying.
Check: when turning on the cold, poke the tester into the b / p output, measure the voltage, look at the dynamics.
2. Voltage drop on one of the consumers.
Check: turn on the duplicator, attach thermal paper for checks to the sponge, press it all the way from the b / p to the motor, stopping at each step for at least 1 minute.
Poor but simple solution:
Take a b / p for 24 volts, take a car relay - and connect the power unit through a relay from a new source. In the photo I can’t make out how it is controlled, but everything is also simple here: if it is via two wires, it goes directly to the control contact of the relay through a current-limiting resistor. If three - the third wire through an electronic key type BTS555 - to the control contact.
The solution, I repeat, is disgusting, but it will work.

Answer 3

Is this a motor? In the photo in the hands - a retracting electromagnet. If there is not enough voltage, most likely the capacitances in the power supply have dried up. Find 24 volts on the power supply and try to supply them from a more powerful source.