To make sure if 3A input current needs to be replaced, press 
the    button to set GDM-9060/9061 in Continuity mode 
and short circuit the HI input terminal with the 3A input 
current terminal. 
If  the test result shows OPEN, either one of  the fuses 
requires replacement. The one is accessible from the rear 
panel, and the other one is within the internal part. 
If  either one of  the fuses of  3A input current is damaged, 
please first check the one (3.15 A,500 V) in the lower-left 
corner of  rear panel. 
1.  Turn the GDM-9060/9061 off 
2.  Press and hold the fuse holder in the rear panel followed 
by rotating it counterclockwise with a flat-blade 
screwdriver.