Jumpstarting unit PS1100 may be incapable of charging?

[Benny7440]

This unit was given to me many years ago but the battery was dead and I left it untouched a long time. I then needed to charge a car battery but it's not performing the job. I would like to diagnose the unit and repair it if not too costly.

The power cable is missing but I connected it to the AC line by means of a broken extention. The cables to the battery can't get to the poles of the battery and I used "probably" a too thin couple of cables. I know this has an effect on the power getting to the battery but... Need ideas as to how to proceed!

Thanks in advanced for any help on this issue!

 

[kellys_eye]

Pictures?

 

[Benny7440]

I've disconnected the Power Supply to the unit and measured it and it read almost zero volts but it's suppoesed to give ~15 DC volts. I'm in the process of connecting another suitable source. After finishing with this step I'll post the outcome of it.

 

[Benny7440]

After disassembling the P/S unit discovered it had a blown out power protection unit inside the transformer (see uploaded photo). The written info on the device is as follows:
M-F AUP0
Q4 <PS>
E <--- the PS & E go inside the 90° rotated square shown
130°C JET
2A 250V~

This squared device is open. I'm in the process of putting a jumper insted of it and supervise closely its temperature at the beginning, at least.

The only question that I still have is why the output at the input of the booster was still zero after replacing the power supply with another 'good' unit? Did I made a short circuit at the soldering step (my supply of tin doesn't contain flux, so I need to add it in advance)?

Any ideas? Thanks!