Martel Electronics 235 User Manual
Page 81
Fuse Testing (continued)
Service Information
230/235
76
Fuse Type/
Location
Fuse
No.
Function
Test
Input/
Output
Model 230
Model 235
Top PCB
F3
F4
V/mV/
Ohms
Output
Place a 10K ohm resistor across the
volts output terminals and jumper
volts out to volts in. Select input
volts and output volts and request
1V out. If the input and output both
read zero, the fuse may be blown.
Main Power
Bottom
PCB
F1
Primary
Power
This fuse should not blow unless an
internal malfunction occurs or
unless the user inadvertently shorts
the main DC power line while the
case is open. The symptom would
be that the unit is completely dead.
F2
Charger
This fuse protects the batteries in
case
the
wrong
charger
is
connected to the unit. The
symptom would be that the unit
would not recharge from the
charger. If this fuse is found blown,
ensure that you are using the
charger supplied with the calibrator.