Duratech TS1640 Underheating

[an_kiwi]

Hi guys

I have got that Duratech TS1640 60W soldering station for free. It uses 900m tips.
The only problem is that it underheats. I need to set 330C to melt regular 60/40

Inside there is a transformer 220v => 24v 1.5 A.
Sorry for my noobism but 2 questions:
1) how can that be 60w if 24v x 1.5a gives maximum 36W?
2) is there any way to correct/increase the temperature scale?

[Jwillis]

I would start by checking the heating element. It has a thermistor built in that may have gone bad or the element is just worn out.
Some clear pictures of the inside of the control unit and the circuit board might reveal something that has failed as well.
Check the voltage of the 24V side of transformer with multimeter. Careful of the high voltage.

[wasedadoc]

Which of the following is the problem:

1.  The iron is always at a lower temperature than the display indicates but it does get hot enough if the display is ignored and the adjustment buttons are used to get to a point where the actual soldering performance is as required.

2.  The display appears to indicate the actual temperature reasonably accurately but the soldering performance is inadequate because the iron does not seem to get hot enough even when the setting is at or near the upper limit?

[an_kiwi]

I believe it is more #1 if I adjust the temperature disregarding the meter it works relatively fine.
But I find that even at maximum (480C) it under performs. I was doing relatively big pads on a m/b
I measured the wattage and at max it was 24W