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1.0 REPAIR INSTRUCTIONS
1.1 GENERAL CLEANING
Remove the machine shell and clean carefully
with compressed air.
1.2 MACHINE: VISUAL INSPECTION
1. Check the general conditions of the electronic
circuit ref. 1, particularly the varistor (fig. 1) if
it presents bursting marks.
FV1
FIG. 1 - C.E. RIF. 3 MOD. HF348
• the state of the levelling condensers (fig.
2): check if there are swellings or breaks
on the container
C2
C3
C26
C27
FIG. 2 - C.E. RIF. 1 MOD. CE22542
• la presenza di crepe o rotture sulle salda-
ture dei trasformatori T1 e T4
• the presence of cracks or breaks on the
welds of the transformers T1 and T4
• check for the presence of burned tracks or
electric discharge marks on the printed cir-
cuit. In case of faults replace always the
electronic circuit ref. 1
2. Check, on all the harnesses, the insulation of
the cables and the state at the connection
points.
1206
PROFESSIONAL INVERTERS MMA 140-180A
1.3 CHECK OF THE MAIN COMPONENTS
WITH TESTER (OHMMETER) ON THE
CIRCUIT REF. 1
1. Check for the presence of short circuits on the
rectifier bridge and the correct value of the
power resistance (fig. 3)
FIG. 3 - C.E. RIF. 3 MOD. HF348
2. Mosfet of the primary circuit and diodes of
recycle: test points 1-2, 1-2, 2-3 of compo-
nents A and B; points 1-2 of components C
and D (fig. 4).
1
2
C
A
B
1
2
D
FIG. 4 - C.E. RIF. 1 MOD. CE22541
3. Diodes of the secondary circuit: check points
1-K of components E-F (fig. 5)
F
E
FIG. 5 - C.E. RIF. 1 MOD. CE22541
1
2
3
3
2
1
Pag. 3
GB
R2
V1
V2
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