Checking The Potentiometer Ribbon Cable; Pe Conductor Test - Fronius TransPocket 1500 Service Manual

Checking the
secondary diode
(continued)
Fig.21
Checking the
potentiometer
ribbon cable
- Open the housing (see the section headed: "Opening the housing")
On the LCA15 board you will find the LED "I
brightness of this LED "I
- Set the welding-current dial to "Minimum"
- Plug the machine into the mains and shift the mains switch to "I"
- Slowly turn the welding-current dial towards Maximum.
- While doing this, watch LED "I
- LED "I
- Potentiometer is OK
- LED "I
- Potentiometer has a short circuit / LCA15 board is faulty
- Replace potentiometer or LCA15 board
- LED "I
- Potentiometer has an interruption / there is a break in the ribbon cable for the
Important! The FPA15 board with ribbon cable belongs to the LCA15 board assembly.
- Replace the potentiometer, LCA 15 board or the FPA15 board
PE conductor
test
Fig.22
(2)
(3)
Fitting the cup springs
Warning! An elelectric shock can be fatal. This check is performed with the
machine switched on and the housing opened up. As long as the machine is
plugged into the mains, do NOT under any circumstance touch the power
source or any of its components.
Follow these instructions even after unplugging the machine from the mains.
The capacitors are still charged - and still very dangerous!
" depends on the pre-set (i.e. "desired") welding amperage.
soll
" gets continuously brighter
soll
" glows constantly
soll
" remains dark
soll
FPA11 board / the LCA15 board is faulty
Testing the PE conductor
Before closing the housing:
- mount the screws (2) with cup springs
(Fig.21)
Note! When mounting the cup
springs (3), make sure that they
are fitted in the correct position
(Fig.21)
" (in English, would be "I
soll
" all the time
soll
49
"). The
des